lttng-modules.git
2 months agoFix: ext4_da_reserve_space changed in 6.11-rc1
Kienan Stewart [Mon, 29 Jul 2024 14:08:32 +0000 (14:08 +0000)] 
Fix: ext4_da_reserve_space changed in 6.11-rc1

See upstream commit:

    commit 0d66b23d79c750276f791411d81a524549a64852
    Author: Zhang Yi <yi.zhang@huawei.com>
    Date:   Fri May 17 20:40:02 2024 +0800

        ext4: make ext4_da_reserve_space() reserve multi-clusters

        Add 'nr_resv' parameter to ext4_da_reserve_space(), which indicates the
        number of clusters wants to reserve, make it reserve multiple clusters
        at a time.

Change-Id: Ib1ce8c3023d53a6d22ec444a435fdb3c871f64c5
Signed-off-by: Kienan Stewart <kstewart@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
2 months agoFix: kfree_skb changed in 6.11-rc1
Kienan Stewart [Mon, 29 Jul 2024 14:01:18 +0000 (14:01 +0000)] 
Fix: kfree_skb changed in 6.11-rc1

See upstream commit:

    commit c53795d48ee8f385c6a9e394651e7ee914baaeba
    Author: Yan Zhai <yan@cloudflare.com>
    Date:   Mon Jun 17 11:09:04 2024 -0700

        net: add rx_sk to trace_kfree_skb

        skb does not include enough information to find out receiving
        sockets/services and netns/containers on packet drops. In theory
        skb->dev tells about netns, but it can get cleared/reused, e.g. by TCP
        stack for OOO packet lookup. Similarly, skb->sk often identifies a local
        sender, and tells nothing about a receiver.

        Allow passing an extra receiving socket to the tracepoint to improve
        the visibility on receiving drops.

Change-Id: I33c8ce1a48006456f198ab1592f733b55be01016
Signed-off-by: Kienan Stewart <kstewart@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
3 months agoFix: event notifier: set eval_capture to false for kprobe and uprobe
Mathieu Desnoyers [Fri, 26 Jul 2024 20:02:04 +0000 (16:02 -0400)] 
Fix: event notifier: set eval_capture to false for kprobe and uprobe

Trying to capture fields for kprobe and uprobe, event notifications
will end up dereferencing NULL pointers. Prevent execution of capture
code in those cases.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: I7ee7e33b9d12986d79aabefcbd5ef91ed2c6d690

4 months agoVersion 2.13.14 v2.13.14
Mathieu Desnoyers [Thu, 18 Jul 2024 17:33:07 +0000 (13:33 -0400)] 
Version 2.13.14

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: I17fac965a7b9aebeefd65404470dd158c225b0b8

4 months agokvm instrumentation: Fix kvm_mmio event NULL pointer dereference
Mathieu Desnoyers [Thu, 4 Jul 2024 15:22:23 +0000 (11:22 -0400)] 
kvm instrumentation: Fix kvm_mmio event NULL pointer dereference

Upstream Linux commit e39d200fa5bf ("KVM: Fix stack-out-of-bounds read
in write_mmio") introduce a NULL pointer check within TP_fast_assign().

lttng-modules commit 33630522da97 ("Update kvm instrumentation for 4.15")
introduce use of:

  ctf_sequence_hex(unsigned char, val, val, u32, len)

without the required NULL pointer check, which can trigger NULL pointer
dereference in case of unsatisfied MMIO read.

Add the missing NULL pointer check. Record a sequence of length 0 in the
trace when the val pointer is NULL.

Reported-by: Fahad Arslan <fahad.arslan@siemens.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: I51a171a56af96e2cf68dba73f7eb473dd6c0ba0e

4 months agoFix: Build on CentOS 9 Stream 2024-06
Kienan Stewart [Thu, 20 Jun 2024 15:15:59 +0000 (11:15 -0400)] 
Fix: Build on CentOS 9 Stream 2024-06

Change-Id: I445d2df9d49930e28e57b6a7d075a9f68e914bad
Signed-off-by: Kienan Stewart <kstewart@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
4 months agofix: file: Rename fcheck lookup_fd_rcu (v5.10.220)
Michael Jeanson [Tue, 25 Jun 2024 18:15:39 +0000 (14:15 -0400)] 
fix: file: Rename fcheck lookup_fd_rcu (v5.10.220)

See upstream backported commit:

  commit c4716bb296504cbc64aeefb370df44e821214c44
  Author: Eric W. Biederman <ebiederm@xmission.com>
  Date:   Fri Nov 20 17:14:27 2020 -0600

    file: Rename fcheck lookup_fd_rcu

    [ Upstream commit 460b4f812a9d473d4b39d87d37844f9fc30a9eb3 ]

    Also remove the confusing comment about checking if a fd exists.  I
    could not find one instance in the entire kernel that still matches
    the description or the reason for the name fcheck.

    The need for better names became apparent in the last round of
    discussion of this set of changes[1].

    [1] https://lkml.kernel.org/r/CAHk-=wj8BQbgJFLa+J0e=iT-1qpmCRTbPAJ8gd6MJQ=kbRPqyQ@mail.gmail.com
Link: https://lkml.kernel.org/r/20201120231441.29911-10-ebiederm@xmission.com
Change-Id: Ib880bd8feef1c5d75d2a018cd93a1d464485ab7b
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
5 months agoCleanup: update stale file paths in LICENSE
Michael Jeanson [Mon, 21 Nov 2022 22:26:59 +0000 (17:26 -0500)] 
Cleanup: update stale file paths in LICENSE

Change-Id: I4849b19daa235b93a6435e57bd764128e43d691e
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
5 months agoCleanup: use SPDX v3.0 identifiers
Michael Jeanson [Mon, 21 Nov 2022 22:10:48 +0000 (17:10 -0500)] 
Cleanup: use SPDX v3.0 identifiers

The short form of GPL-2.0 and LGPL-2.1 were deprecated in favour of the
clearer GPL-2.0-only and GPL-2.0-or-later in the SPDX license list v3.0.

Change-Id: I8b59b3689aa38fb5f5a114f9d02f22274a5bff57
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
5 months agoWarn and return on fd overflow fdt
Michael Jeanson [Wed, 29 May 2024 19:02:15 +0000 (15:02 -0400)] 
Warn and return on fd overflow fdt

The fdt should only grow and iterate_fd() holds file_lock, which should
ensure the fdt does not change while the lock is taken but be cautious
and check anyway.

Change-Id: Icd6a3263026734cbe3f296f6087f79add4148a8f
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
5 months agofix: close_on_exec(): pass files_struct instead of fdtable (v6.10)
Michael Jeanson [Mon, 27 May 2024 14:49:45 +0000 (10:49 -0400)] 
fix: close_on_exec(): pass files_struct instead of fdtable (v6.10)

See upstream commit:

  commit f60d374d2cc88034385265d193a38e3f4a4b430c
  Author: Al Viro <viro@zeniv.linux.org.uk>
  Date:   Thu Jan 4 21:35:38 2024 -0500

    close_on_exec(): pass files_struct instead of fdtable

    both callers are happier that way...

Change-Id: I8cdabb073c2090842b27b74954d86cb486c43b3e
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
5 months agofix: net: udp: add IP/port data to the tracepoint udp/udp_fail_queue_rcv_skb (v6.10)
Michael Jeanson [Mon, 27 May 2024 15:11:21 +0000 (11:11 -0400)] 
fix: net: udp: add IP/port data to the tracepoint udp/udp_fail_queue_rcv_skb (v6.10)

See upstream commit:

  commit e9669a00bba79442dd4862c57761333d6a020c24
  Author: Balazs Scheidler <bazsi77@gmail.com>
  Date:   Tue Mar 26 19:05:47 2024 +0100

    net: udp: add IP/port data to the tracepoint udp/udp_fail_queue_rcv_skb

    The udp_fail_queue_rcv_skb() tracepoint lacks any details on the source
    and destination IP/port whereas this information can be critical in case
    of UDP/syslog.

Change-Id: I0c337c5817b0a120298cbf5088d60671d9625b0d
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
5 months agofix: btrfs: move ->parent and ->ref_root into btrfs_delayed_ref_node (v6.10)
Michael Jeanson [Mon, 27 May 2024 17:13:15 +0000 (13:13 -0400)] 
fix: btrfs: move ->parent and ->ref_root into btrfs_delayed_ref_node (v6.10)

See upstream commit:

  commit cf4f04325b2b27efa5697ba0ea4c1abdee0035b4
  Author: Josef Bacik <josef@toxicpanda.com>
  Date:   Fri Apr 12 22:57:13 2024 -0400

    btrfs: move ->parent and ->ref_root into btrfs_delayed_ref_node

    These two members are shared by both the tree refs and data refs, so
    move them into btrfs_delayed_ref_node proper.  This allows us to greatly
    simplify the comparison code, as the shared refs always only sort on
    parent, and the non shared refs always sort first on ref_root, and then
    only data refs sort on their specific fields.

Change-Id: Ib7c92cc4bb8d674ac66ccfa25c03476f7adaaf90
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
5 months agofix: btrfs: simplify delayed ref tracepoints (v6.10)
Michael Jeanson [Mon, 27 May 2024 17:04:42 +0000 (13:04 -0400)] 
fix: btrfs: simplify delayed ref tracepoints (v6.10)

See upstream commit:

  commit 1bff6d4f873790cfc675afce9860208576508c5a
  Author: Josef Bacik <josef@toxicpanda.com>
  Date:   Fri Apr 12 20:27:00 2024 -0400

    btrfs: simplify delayed ref tracepoints

    Now that all of the delayed ref information is in the delayed ref node,
    drastically simplify the delayed ref tracepoints by simply passing in
    the btrfs_delayed_ref_node and populating the tracepoints with the
    values from the structure itself.

Change-Id: Ic90bc23d6aa558baec33adc33b4d21e052e83375
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
6 months agoFix mm_vmscan_lru_isolate tracepoint for RHEL 9.4 kernel
Martin Hicks [Fri, 17 May 2024 14:54:27 +0000 (10:54 -0400)] 
Fix mm_vmscan_lru_isolate tracepoint for RHEL 9.4 kernel

Redhat has moved to using the format first found in the 6.7 kernel
for the mm_vmscan_lru_isolate tracepoint.

Change-Id: I2aa84769c0070458d902e9a0305488d6d8a380e1
Signed-off-by: Martin Hicks <martin@sr-research.com>
Signed-off-by: Kienan Stewart <kstewart@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
6 months agoVersion 2.13.13 v2.13.13
Mathieu Desnoyers [Mon, 13 May 2024 18:51:11 +0000 (14:51 -0400)] 
Version 2.13.13

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: Ia4f3e6f2686278cfdd4aea5389c63072e0fe42cb

6 months agosplice wrapper: Fix missing declaration
Mathieu Desnoyers [Thu, 9 May 2024 19:46:21 +0000 (15:46 -0400)] 
splice wrapper: Fix missing declaration

Include the splice wrapper header within the splice.c implementation to
prevent missing declaration warnings.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: Ib62f7f575324aa3268d76fb38c39ef70257155ef

6 months agopage alloc wrapper: Fix get_pfnblock_flags_mask prototype
Mathieu Desnoyers [Thu, 9 May 2024 18:43:05 +0000 (14:43 -0400)] 
page alloc wrapper: Fix get_pfnblock_flags_mask prototype

The canary __canary__get_pfnblock_flags_mask has never done its job of
detecting changes to the prototype of get_pfnblock_flags_mask because
it was actually calling the wrapper, because the wrapper/page_alloc.h
header maps get_pfnblock_flags_mask to wrapper_get_pfnblock_flags_mask.

Unfortunately, this wrapper is included by page_alloc.c only _after_ the
linux/pageblock-flags.h header is included, which means the
get_pfnblock_flags_mask prototype does _not_ have the wrapper prefix,
which prevents it from being useful for any kind of type validation.

This has been detected by a compiler warning stating that
wrapper_get_pfnblock_flags_mask() does not have a prior declaration.

Move the wrapper/page_alloc.h include _before_ including
pageblock-flags.h. This ensures the declaration has the wrapper_ prefix,
and therefore the compiler compares the declaration with the definition
of wrapper_get_pfnblock_flags_mask within page_alloc.c. The canary
function can be removed because it is redundant with this type check.

With this proper type check in place, we notice the following two
changes upstream:

commit 535b81e209219 ("mm/page_alloc.c: remove unnecessary end_bitidx for [set|get]_pfnblock_flags_mask()")
introduced in v5.9 removes the end_bitidx argument.

commit ca891f41c4c79 ("mm: constify get_pfnblock_flags_mask and get_pfnblock_migratetype")
introduced in v5.14 adds a const qualifier to the struct page pointer.

Adapt the code to match the evolution of this prototype.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: I51b7871edfbff0f74ba1cf4d0ad988eb8d642b4e

6 months agolttng probe: include events-internal.h
Mathieu Desnoyers [Thu, 9 May 2024 17:55:44 +0000 (13:55 -0400)] 
lttng probe: include events-internal.h

Include events-internal.h for the declarations of lttng_logger_init and
lttng_logger_exit.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: I14968060c309083f90a282f186f3c635f1ebfd8d

6 months agosyscalls: Remove unused duplicated code
Mathieu Desnoyers [Thu, 9 May 2024 17:54:20 +0000 (13:54 -0400)] 
syscalls: Remove unused duplicated code

lttng_abi_syscall_list() was moved to src/lttng-abi.c within the 2.13
refactoring. Remove this unused copy.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: Iabbab3b576e3d85bc5ac9831729a5786b5c5f224

6 months agostatedump: Add missing events-internal.h include
Mathieu Desnoyers [Thu, 9 May 2024 17:52:54 +0000 (13:52 -0400)] 
statedump: Add missing events-internal.h include

Include events-internal.h for the declaration of
lttng_statedump_start().

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: Ieda391aa0d780113efe1d517d8bc5aedb2095a2c

6 months agolttng-events: Add missing static
Mathieu Desnoyers [Thu, 9 May 2024 17:50:19 +0000 (13:50 -0400)] 
lttng-events: Add missing static

get_tracker() and lttng_metadata_printf() are only used within the
compile unit, mark them as static.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: Ie454c85cc29a30d964922fcfe1f88f3fb91bbc8f

6 months agoevent notifier: Add missing static
Mathieu Desnoyers [Thu, 9 May 2024 17:49:37 +0000 (13:49 -0400)] 
event notifier: Add missing static

Mark capture_sequence() static because it is only used within the
compile unit.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: I003e5cf016fbf2f2df24f4550a6c285e020956d0

6 months agocontext callstack: Add missing static
Mathieu Desnoyers [Thu, 9 May 2024 17:49:08 +0000 (13:49 -0400)] 
context callstack: Add missing static

lttng_cs_event_fields() is only used within the compile unit, mark it
static.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: I3435c6de411a0671de86ecdbcb3e1ea019d908e6

6 months agolttng-clock: Add missing lttng/events-internal.h include
Mathieu Desnoyers [Thu, 9 May 2024 17:48:05 +0000 (13:48 -0400)] 
lttng-clock: Add missing lttng/events-internal.h include

Needed for lttng_clock_ref and lttng_clock_unref declarations.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: Idb21d942b9e2151f1d5a78b31b28ca1ac455719b

6 months agolttng-calibrate: Add missing static and include
Mathieu Desnoyers [Thu, 9 May 2024 17:46:52 +0000 (13:46 -0400)] 
lttng-calibrate: Add missing static and include

Include lttng/events-internal.h for the lttng_calibrate
declaration. Make lttng_calibrate_kretprobe static.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: Ia18aa60e69cae7a16ed7d17c8297d7ad3bb3aca2

6 months agolttng-bytecode: Remove dead code
Mathieu Desnoyers [Thu, 9 May 2024 17:46:07 +0000 (13:46 -0400)] 
lttng-bytecode: Remove dead code

Functions lttng_filter_enabler_attach_bytecode and
lttng_free_enabler_filter_bytecode are unused since the
refactoring of lttng 2.13. Remove them.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: I2abbb3906cdb5c1b7fa9c27c7871a51af7697832

6 months agolttng-abi: Add missing static to function definitions
Mathieu Desnoyers [Thu, 9 May 2024 17:45:45 +0000 (13:45 -0400)] 
lttng-abi: Add missing static to function definitions

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: Icc6928df5a47c96a560e18b2c854780afbcf6307

6 months agoring buffer: Add missing static to function definitions
Mathieu Desnoyers [Thu, 9 May 2024 17:45:24 +0000 (13:45 -0400)] 
ring buffer: Add missing static to function definitions

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: I80c03d8c8879777e37d24c3574ba7bdea512446a

6 months agoblkdev wrapper: Fix constness warning
Mathieu Desnoyers [Thu, 9 May 2024 17:44:05 +0000 (13:44 -0400)] 
blkdev wrapper: Fix constness warning

Upstream commit f8c7511db009d ("block: make block_class constant")
makes the block_class const. Reflect this change in the lttng-modules
canary function.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: Ib3aadd3dedc413f8370b9739f200ce9663c38d99

7 months agoFix: timer_expire_entry changed in 4.19.312
Kienan Stewart [Mon, 15 Apr 2024 13:25:26 +0000 (09:25 -0400)] 
Fix: timer_expire_entry changed in 4.19.312

See upstream commit:

    commit bbb5b1c060d73ca96ccc8cceaa81f5e1a96e8fa4
    Author: Anna-Maria Gleixner <anna-maria@linutronix.de>
    Date:   Thu Mar 21 13:09:21 2019 +0100

        timer/trace: Improve timer tracing

        [ Upstream commit f28d3d5346e97e60c81f933ac89ccf015430e5cf ]

        Timers are added to the timer wheel off by one. This is required in
        case a timer is queued directly before incrementing jiffies to prevent
        early timer expiry.

        When reading a timer trace and relying only on the expiry time of the timer
        in the timer_start trace point and on the now in the timer_expiry_entry
        trace point, it seems that the timer fires late. With the current
        timer_expiry_entry trace point information only now=jiffies is printed but
        not the value of base->clk. This makes it impossible to draw a conclusion
        to the index of base->clk and makes it impossible to examine timer problems
        without additional trace points.

        Therefore add the base->clk value to the timer_expire_entry trace
        point, to be able to calculate the index the timer base is located at
        during collecting expired timers.

Change-Id: I2ebdbb637db0966ff51f45bf66916a59a496b50c
Signed-off-by: Kienan Stewart <kstewart@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
7 months agoFix: dev_base_lock removed in linux 6.9-rc1
Kienan Stewart [Mon, 25 Mar 2024 14:53:46 +0000 (10:53 -0400)] 
Fix: dev_base_lock removed in linux 6.9-rc1

See upstream commit:

    commit 1b3ef46cb7f2618cc0b507393220a69810f6da12
    Author: Eric Dumazet <edumazet@google.com>
    Date:   Tue Feb 13 06:32:45 2024 +0000

        net: remove dev_base_lock

        dev_base_lock is not needed anymore, all remaining users also hold RTNL.

Change-Id: I6b07e6eed07fd398302ca14d23162ed24d74df15
Signed-off-by: Kienan Stewart <kstewart@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
7 months agoFix: mm_compaction_migratepages changed in linux 6.9-rc1
Kienan Stewart [Mon, 25 Mar 2024 14:30:32 +0000 (10:30 -0400)] 
Fix: mm_compaction_migratepages changed in linux 6.9-rc1

See upstream commit:

    commit ab755bf4249b992fc2140d615ab0a686d50765b4
    Author: Baolin Wang <baolin.wang@linux.alibaba.com>
    Date:   Tue Feb 20 14:16:31 2024 +0800

        mm: compaction: update the cc->nr_migratepages when allocating or freeing the freepages

        Currently we will use 'cc->nr_freepages >= cc->nr_migratepages' comparison
        to ensure that enough freepages are isolated in isolate_freepages(),
        however it just decreases the cc->nr_freepages without updating
        cc->nr_migratepages in compaction_alloc(), which will waste more CPU
        cycles and cause too many freepages to be isolated.

        So we should also update the cc->nr_migratepages when allocating or
        freeing the freepages to avoid isolating excess freepages.  And I can see
        fewer free pages are scanned and isolated when running thpcompact on my
        Arm64 server:

                                               k6.7         k6.7_patched
        Ops Compaction pages isolated      120692036.00   118160797.00
        Ops Compaction migrate scanned     131210329.00   154093268.00
        Ops Compaction free scanned       1090587971.00  1080632536.00
        Ops Compact scan efficiency               12.03          14.26

        Moreover, I did not see an obvious latency improvements, this is likely
        because isolating freepages is not the bottleneck in the thpcompact test
        case.

                                      k6.7                  k6.7_patched
        Amean     fault-both-1      1089.76 (   0.00%)     1080.16 *   0.88%*
        Amean     fault-both-3      1616.48 (   0.00%)     1636.65 *  -1.25%*
        Amean     fault-both-5      2266.66 (   0.00%)     2219.20 *   2.09%*
        Amean     fault-both-7      2909.84 (   0.00%)     2801.90 *   3.71%*
        Amean     fault-both-12     4861.26 (   0.00%)     4733.25 *   2.63%*
        Amean     fault-both-18     7351.11 (   0.00%)     6950.51 *   5.45%*
        Amean     fault-both-24     9059.30 (   0.00%)     9159.99 *  -1.11%*
        Amean     fault-both-30    10685.68 (   0.00%)    11399.02 *  -6.68%*

Change-Id: I103a43fd1b549360b3fc978fd409b7c17ef3e192
Signed-off-by: Kienan Stewart <kstewart@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
7 months agoFix: ASoC add component to set_bias_level events in linux 6.9-rc1
Kienan Stewart [Mon, 25 Mar 2024 13:40:29 +0000 (09:40 -0400)] 
Fix: ASoC add component to set_bias_level events in linux 6.9-rc1

See upstream commit:

    commit 6ef46a69ec32fe1cf56de67742fcd01af4bf48af
    Author: Luca Ceresoli <luca.ceresoli@bootlin.com>
    Date:   Wed Mar 6 10:30:00 2024 +0100

        ASoC: trace: add component to set_bias_level trace events

        The snd_soc_bias_level_start and snd_soc_bias_level_done trace events
        currently look like:

                   aplay-229   [000]  1250.140778: snd_soc_bias_level_start: card=vscn-2046 val=1
                   aplay-229   [000]  1250.140784: snd_soc_bias_level_done: card=vscn-2046 val=1
                   aplay-229   [000]  1250.140786: snd_soc_bias_level_start: card=vscn-2046 val=2
                   aplay-229   [000]  1250.140788: snd_soc_bias_level_done: card=vscn-2046 val=2
            kworker/u8:1-21    [000]  1250.140871: snd_soc_bias_level_start: card=vscn-2046 val=1
            kworker/u8:0-11    [000]  1250.140951: snd_soc_bias_level_start: card=vscn-2046 val=1
            kworker/u8:0-11    [000]  1250.140956: snd_soc_bias_level_done: card=vscn-2046 val=1
            kworker/u8:0-11    [000]  1250.140959: snd_soc_bias_level_start: card=vscn-2046 val=2
            kworker/u8:0-11    [000]  1250.140961: snd_soc_bias_level_done: card=vscn-2046 val=2
            kworker/u8:1-21    [000]  1250.167219: snd_soc_bias_level_done: card=vscn-2046 val=1
            kworker/u8:1-21    [000]  1250.167222: snd_soc_bias_level_start: card=vscn-2046 val=2
            kworker/u8:1-21    [000]  1250.167232: snd_soc_bias_level_done: card=vscn-2046 val=2
            kworker/u8:0-11    [000]  1250.167440: snd_soc_bias_level_start: card=vscn-2046 val=3
            kworker/u8:0-11    [000]  1250.167444: snd_soc_bias_level_done: card=vscn-2046 val=3
            kworker/u8:1-21    [000]  1250.167497: snd_soc_bias_level_start: card=vscn-2046 val=3
            kworker/u8:1-21    [000]  1250.167506: snd_soc_bias_level_done: card=vscn-2046 val=3

        There are clearly multiple calls, one per component, but they cannot be
        discriminated from each other.

        Change the ftrace events to also print the component name, to make it clear
        which part of the code is involved. This requires changing the passed value
        from a struct snd_soc_card, where the DAPM context is not kwown, to a
        struct snd_soc_dapm_context where it is obviously known but the a card
        pointer is also available.

        With this change, the resulting trace becomes:

                   aplay-247   [000]  1436.357332: snd_soc_bias_level_start: card=vscn-2046 component=(none) val=1
                   aplay-247   [000]  1436.357338: snd_soc_bias_level_done: card=vscn-2046 component=(none) val=1
                   aplay-247   [000]  1436.357340: snd_soc_bias_level_start: card=vscn-2046 component=(none) val=2
                   aplay-247   [000]  1436.357343: snd_soc_bias_level_done: card=vscn-2046 component=(none) val=2
            kworker/u8:4-215   [000]  1436.357437: snd_soc_bias_level_start: card=vscn-2046 component=ff560000.codec val=1
            kworker/u8:5-231   [000]  1436.357518: snd_soc_bias_level_start: card=vscn-2046 component=ff320000.i2s val=1
            kworker/u8:5-231   [000]  1436.357523: snd_soc_bias_level_done: card=vscn-2046 component=ff320000.i2s val=1
            kworker/u8:5-231   [000]  1436.357526: snd_soc_bias_level_start: card=vscn-2046 component=ff320000.i2s val=2
            kworker/u8:5-231   [000]  1436.357528: snd_soc_bias_level_done: card=vscn-2046 component=ff320000.i2s val=2
            kworker/u8:4-215   [000]  1436.383217: snd_soc_bias_level_done: card=vscn-2046 component=ff560000.codec val=1
            kworker/u8:4-215   [000]  1436.383221: snd_soc_bias_level_start: card=vscn-2046 component=ff560000.codec val=2
            kworker/u8:4-215   [000]  1436.383231: snd_soc_bias_level_done: card=vscn-2046 component=ff560000.codec val=2
            kworker/u8:5-231   [000]  1436.383468: snd_soc_bias_level_start: card=vscn-2046 component=ff320000.i2s val=3
            kworker/u8:5-231   [000]  1436.383472: snd_soc_bias_level_done: card=vscn-2046 component=ff320000.i2s val=3
            kworker/u8:4-215   [000]  1436.383503: snd_soc_bias_level_start: card=vscn-2046 component=ff560000.codec val=3
            kworker/u8:4-215   [000]  1436.383513: snd_soc_bias_level_done: card=vscn-2046 component=ff560000.codec val=3

Change-Id: I959f1680c002acdf29828b968d3975247f5433d8
Signed-off-by: Kienan Stewart <kstewart@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
7 months agoFix: ASoC snd_doc_dapm on linux 6.9-rc1
Kienan Stewart [Mon, 25 Mar 2024 12:54:42 +0000 (08:54 -0400)] 
Fix: ASoC snd_doc_dapm on linux 6.9-rc1

See upstream commit:

    commit 7df3eb4cdb6bbfa482f51548b9fd47c2723c68ba
    Author: Luca Ceresoli <luca.ceresoli@bootlin.com>
    Date:   Wed Mar 6 10:30:01 2024 +0100

        ASoC: trace: add event to snd_soc_dapm trace events

        Add the event value to the snd_soc_dapm_start and snd_soc_dapm_done trace
        events to make them more informative.

        Trace before:

                   aplay-229   [000]   250.140309: snd_soc_dapm_start:   card=vscn-2046
                   aplay-229   [000]   250.167531: snd_soc_dapm_done:    card=vscn-2046
                   aplay-229   [000]   251.169588: snd_soc_dapm_start:   card=vscn-2046
                   aplay-229   [000]   251.195245: snd_soc_dapm_done:    card=vscn-2046

        Trace after:

                   aplay-214   [000]   693.290612: snd_soc_dapm_start:   card=vscn-2046 event=1
                   aplay-214   [000]   693.315508: snd_soc_dapm_done:    card=vscn-2046 event=1
                   aplay-214   [000]   694.537349: snd_soc_dapm_start:   card=vscn-2046 event=2
                   aplay-214   [000]   694.563241: snd_soc_dapm_done:    card=vscn-2046 event=2

Change-Id: If0d33544b8dd1dfb3d12ca9390892190fc0444b0
Signed-off-by: Kienan Stewart <kstewart@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
7 months agoFix: build kvm probe on EL 8.4+
Kienan Stewart [Fri, 22 Mar 2024 13:28:08 +0000 (09:28 -0400)] 
Fix: build kvm probe on EL 8.4+

The lower value of the EL range, 240.15.1, corresponds to the first
import of EL r8 kernels into Rocky Linux's kernel staging repo.
The change may have been introduced in an earlier RHEL 8 kernel,
prior to the history of imports into Rocky.

Change-Id: Icefe472d43e28cc09746e9e046b12299609ebab1
Signed-off-by: Kienan Stewart <kstewart@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
7 months agoFix: support ext4_journal_start on EL 8.4+
Kienan Stewart [Fri, 22 Mar 2024 13:55:55 +0000 (09:55 -0400)] 
Fix: support ext4_journal_start on EL 8.4+

The lower value of the EL range, 240.15.1, corresponds to the first
import of EL r8 kernels into Rocky Linux's kernel staging repo.
The change may have been introduced in an earlier RHEL 8 kernel,
prior to the history of imports into Rocky.

Change-Id: Ibec02b382478bee33947d079f33835823827f4c5
Signed-off-by: Kienan Stewart <kstewart@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
7 months agoFix: correct RHEL range for kmem_cache_free define
Kienan Stewart [Thu, 21 Mar 2024 19:16:29 +0000 (15:16 -0400)] 
Fix: correct RHEL range for kmem_cache_free define

When compiling against RHEL 8.5 kernels, lttng-modules builds fail
with the following error:

```
lttng-modules/src/probes/../../include/lttng/tracepoint-event-impl.h:133:6: error: conflicting types for â€˜trace_kmem_
cache_free’; have â€˜void(long unsigned int,  const void *)’
```

The original range was introduced in commit
89d917153fc52c1e5b0ddabf8ee078897656b263 which tested against RHEL 8.6
and not RHEL 8.5.

Change-Id: Icff98c15415ce8e1e95a10974cd65ed6e84cd00a
Signed-off-by: Kienan Stewart <kstewart@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 months agoVersion 2.13.12 v2.13.12
Mathieu Desnoyers [Thu, 21 Mar 2024 19:45:34 +0000 (15:45 -0400)] 
Version 2.13.12

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: I448e493bbf064587e3b717a9f5c41c13f0569f29

8 months agodocs: Add supported versions and fix-backport policy
Kienan Stewart [Thu, 14 Mar 2024 15:37:05 +0000 (11:37 -0400)] 
docs: Add supported versions and fix-backport policy

Change-Id: I5d6da21b9541f838cb326263eff8c1448e37fc55
Signed-off-by: Kienan Stewart <kstewart@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 months agodocs: Add links to project resources
Kienan Stewart [Fri, 24 Nov 2023 15:09:46 +0000 (10:09 -0500)] 
docs: Add links to project resources

Indicate that Gerrit (https://review.lttng.org) is the principal place
where patches are submitted and reviewed, rather than the mailing list.

Based on feedback received on the mailing list:
https://lists.lttng.org/pipermail/lttng-dev/2023-November/030670.html

Change-Id: I611deeec26393fc25c9a103c022687198100df0c
Signed-off-by: Kienan Stewart <kstewart@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 months agoFix: Correct minimum version in jbd2 SLE kernel range
Kienan Stewart [Fri, 8 Mar 2024 17:47:06 +0000 (12:47 -0500)] 
Fix: Correct minimum version in jbd2 SLE kernel range

This range was introduced in commit b49650509ff072d37ec112cf45a5f14f382c9a31;
however, the range is wrong and worked because the kernel versions
(eg. `5.14.21-150400.24.100-default`) were evaluated to values
greater than `LTTNG_SLE_KERNEL_RANGE(5,14,21,24,46,1)`.

As a result builds of lttng-modules against older versions of SLE
kernels failed.

Change-Id: I23d97d84a23c7b24e957fe943932d6aefbe1b409
Signed-off-by: Kienan Stewart <kstewart@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 months agoFix: Handle recent SLE major version codes
Kienan Stewart [Fri, 8 Mar 2024 16:26:02 +0000 (11:26 -0500)] 
Fix: Handle recent SLE major version codes

Starting in early 2022, the SLE linux version codes changed from the
previous style `5.3.18-59.40.1` to a new convention in which the major
version is a compound number consisting of the major release version,
the service pack version, and the auxillary version (currently unused
from my understanding) similar to the following `5.3.18-150300.59.43.1`[1].

The newer values used in the SLE major version causes the integer
value to "overflow" the expected number of digits and the comparisons
may fail. The `LTTNG_SLE_KERNEL_VERSION` macro also multiplies the
`LTTNG_KERNEL_VERSION` by `100000000ULL` which doesn't work in all
situations, as the resulting value is too large to be stored fully in
an `unsigned long long`.

Example of previous results:

```
// Example range comparison. True or false depending on the value of
// `LTTNG_SLE_VERSION_CODE` and `LTTNG_LINUX_VERSION_CODE`.
LTTNG_SLE_KERNEL_RANGE(5,15,21,150400,24,46, 5,15,0,0,0,0);

// Note: values printed with `%ull`
LTTNG_SLE_KERNEL_VERSION(5,15,21,24,26,1); // 6106486698364570153
LTTNG_SLE_KERNEL_VERSION(5,15,0,0,0,0);    // 0
LTTNG_KERNEL_VERSION(5,15,0);              // 84869120

// Corrected SLE version codes
LTTNG_SLE_KERNEL_VERSION(5,14,21,150400,24,26); // 14918348902249793914
LTTNG_SLE_KERNEL_VERSION(5,14,21,150400,24,46); // 14918348902249793934
LTTNG_SLE_KERNEL_VERSION(5,15,0,150400,0,0));   // 6971507145825058816
```

`LTTNG_KERNEL_VERSION` packs the kernel version into a 32-bit integer;
however, using that type of packing on the SLE kernel version will not
work well:

* Major: `150400` needs 18 bits
* Minor: may exceed 127, requires 8 bits (eg. `4.12.14-150100.197.148.1`)
* Patch: may exceed 127, requires 8 bits (eg. `5.3.18-150300.59.124.1`)

In this patch, the SLE version is packed into a 64-bit integer
with 48 bits for the major version, 8 bits for each of the minor and
patch versions.

As a result of packing the SLE version into a 64-bit integer,
it is not possible to coherently combine an `LTTNG_KERNEL_VERSION` and
an `LTTNG_SLE_KERNEL_VERSION`. Doing so would require an integer
larger than 64-bits. Therefore, the `LTTNG_SLE_KERNEL_RANGE` macro has
been adjusted to perform the range comparisons using the two values
separately. The usage of the `LTTNG_SLE_KERNEL_RANGE` remains
unchanged, as `LTTNG_SLE_VERSION` is only used inside that macro.

Using the adjusted macros:

```
// Example range comparison. True or false depending on the value of
// `LTTNG_SLE_VERSION_CODE` and `LTTNG_LINUX_VERSION_CODE`.
LTTNG_SLE_KERNEL_RANGE(5,15,21,150400,24,46, 5,15,0,0,0,0);

// Note: values printed with `%ull`
LTTNG_SLE_VERSION(24,26,1); // 1579521
LTTNG_SLE_VERSION(0,0,0);   // 0
LTTNG_KERNEL_VERSION(5,15,0);      // 84869120

// Corrected SLE version codes
LTTNG_SLE_VERSION(150400,24,26); // 9856620570
LTTNG_SLE_VERSION(150400,24,46); // 9856620590
LTTNG_SLE_VERSION(150400,0,0));  // 9863168000
```

Known drawbacks
===============

It's possible that future releases of SLE kernels have minor or patch
values that exceed 255 (SLE15SP1 has a release using `197`, for example),
requiring an adjustment to using more bits for those fields when
packing into a 64-bit integer.

The schema of multiplying an `LTTNG_KERNEL_VERSION` by a large value
is used for other distributions. RHEL in particular uses
`100000000ULL`, which could lead to overflow issues with certain
comparisons similar to the previous behaviour of
`LTTNG_SLE_KERNEL_VERSION(5,15,0,0,0,0);`.

[1]: https://www.suse.com/support/kb/doc/?id=000019587#SLE15SP4

Change-Id: Iaa90bfa422e47213a13829cdf008ab20d7484cab
Signed-off-by: Kienan Stewart <kstewart@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 months agoFix: build on sles15sp4
Kienan Stewart [Tue, 27 Feb 2024 16:47:58 +0000 (11:47 -0500)] 
Fix: build on sles15sp4

Introduced in 5.14.21-150400.46.1.

See SLE commit:

    commit 96a814b6c528f45fc92bf8e6de90ad8923511091
    Author: Petr Pavlu <petr.pavlu@suse.com>
    Date:   Tue Jan 24 14:52:24 2023 +0100

        jbd2: use the correct print format (git-fixes).

        suse-commit: 34db311bec3ca4388b82b2355eed7c08b25f5a2e

Change-Id: Ic267b9498b7f9a4a814514ff82f9226f844c133f
Signed-off-by: Kienan Stewart <kstewart@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 months agoCompile fixes for RHEL 9.3 kernels
Martin Hicks [Fri, 26 Jan 2024 17:18:33 +0000 (12:18 -0500)] 
Compile fixes for RHEL 9.3 kernels

The ranges were build tested on RHEL9.2 (5.14.0-284.11.1), RHEL9.3
(5.14.0-362.8.1) and RHEL8.9 (4.18.0-513.11.1).

This disables the kmem and compaction modules.  I don't believe getting
these to compile will be easy, as the required struct declarations are
in vmlinux.h, and haven't been moved into mm/internal.h and mm/slab.h in
the RHEL sources.

Change-Id: I999c593d6850e2327f6e9df8432a4ea2325a7cea
Signed-off-by: Martin Hicks <martin@sr-research.com>
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 months agoFix: ext4_discard_preallocations changed in linux 6.8.0-rc3
Kienan Stewart [Mon, 5 Feb 2024 13:52:29 +0000 (08:52 -0500)] 
Fix: ext4_discard_preallocations changed in linux 6.8.0-rc3

See upstream commit:

    commit f0e54b6087de9571ec61c189d6c378b81edbe3b2
    Author: Kemeng Shi <shikemeng@huaweicloud.com>
    Date:   Fri Jan 5 17:21:02 2024 +0800

        ext4: remove 'needed' in trace_ext4_discard_preallocations

        As 'needed' to trace_ext4_discard_preallocations is always 0 which
        is meaningless. Just remove it.

Change-Id: Ib6b698ca553c4beebd4ca791c83bbbb927901758
Signed-off-by: Kienan Stewart <kstewart@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 months agoFix: btrfs_get_extent flags and compress_type changed in linux 6.8.0-rc1
Kienan Stewart [Mon, 22 Jan 2024 18:13:36 +0000 (13:13 -0500)] 
Fix: btrfs_get_extent flags and compress_type changed in linux 6.8.0-rc1

See upstream commit:

    commit f86f7a75e2fb5fd7d31d00eab8a392f97ba42ce9
    Author: Filipe Manana <fdmanana@suse.com>
    Date:   Mon Dec 4 16:20:33 2023 +0000

        btrfs: use the flags of an extent map to identify the compression type

        Currently, in struct extent_map, we use an unsigned int (32 bits) to
        identify the compression type of an extent and an unsigned long (64 bits
        on a 64 bits platform, 32 bits otherwise) for flags. We are only using
        6 different flags, so an unsigned long is excessive and we can use flags
        to identify the compression type instead of using a dedicated 32 bits
        field.

        We can easily have tens or hundreds of thousands (or more) of extent maps
        on busy and large filesystems, specially with compression enabled or many
        or large files with tons of small extents. So it's convenient to have the
        extent_map structure as small as possible in order to use less memory.

        So remove the compression type field from struct extent_map, use flags
        to identify the compression type and shorten the flags field from an
        unsigned long to a u32. This saves 8 bytes (on 64 bits platforms) and
        reduces the size of the structure from 136 bytes down to 128 bytes, using
        now only two cache lines, and increases the number of extent maps we can
        have per 4K page from 30 to 32. By using a u32 for the flags instead of
        an unsigned long, we no longer use test_bit(), set_bit() and clear_bit(),
        but that level of atomicity is not needed as most flags are never cleared
        once set (before adding an extent map to the tree), and the ones that can
        be cleared or set after an extent map is added to the tree, are always
        performed while holding the write lock on the extent map tree, while the
        reader holds a lock on the tree or tests for a flag that never changes
        once the extent map is in the tree (such as compression flags).

Change-Id: I95402d43f064c016b423b48652e4968d3db9b8a9
Signed-off-by: Kienan Stewart <kstewart@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 months agoFix: btrfs_chunk tracepoints changed in linux 6.8.0-rc1
Kienan Stewart [Mon, 22 Jan 2024 17:17:33 +0000 (12:17 -0500)] 
Fix: btrfs_chunk tracepoints changed in linux 6.8.0-rc1

See upstream commit:

    commit 7dc66abb5a47778d7db327783a0ba172b8cff0b5
    Author: Filipe Manana <fdmanana@suse.com>
    Date:   Tue Nov 21 13:38:38 2023 +0000

        btrfs: use a dedicated data structure for chunk maps

        Currently we abuse the extent_map structure for two purposes:

        1) To actually represent extents for inodes;
        2) To represent chunk mappings.

        This is odd and has several disadvantages:

        1) To create a chunk map, we need to do two memory allocations: one for
           an extent_map structure and another one for a map_lookup structure, so
           more potential for an allocation failure and more complicated code to
           manage and link two structures;

        2) For a chunk map we actually only use 3 fields (24 bytes) of the
           respective extent map structure: the 'start' field to have the logical
           start address of the chunk, the 'len' field to have the chunk's size,
           and the 'orig_block_len' field to contain the chunk's stripe size.

           Besides wasting a memory, it's also odd and not intuitive at all to
           have the stripe size in a field named 'orig_block_len'.

           We are also using 'block_len' of the extent_map structure to contain
           the chunk size, so we have 2 fields for the same value, 'len' and
           'block_len', which is pointless;

        3) When an extent map is associated to a chunk mapping, we set the bit
           EXTENT_FLAG_FS_MAPPING on its flags and then make its member named
           'map_lookup' point to the associated map_lookup structure. This means
           that for an extent map associated to an inode extent, we are not using
           this 'map_lookup' pointer, so wasting 8 bytes (on a 64 bits platform);

        4) Extent maps associated to a chunk mapping are never merged or split so
           it's pointless to use the existing extent map infrastructure.

        So add a dedicated data structure named 'btrfs_chunk_map' to represent
        chunk mappings, this is basically the existing map_lookup structure with
        some extra fields:

        1) 'start' to contain the chunk logical address;
        2) 'chunk_len' to contain the chunk's length;
        3) 'stripe_size' for the stripe size;
        4) 'rb_node' for insertion into a rb tree;
        5) 'refs' for reference counting.

        This way we do a single memory allocation for chunk mappings and we don't
        waste memory for them with unused/unnecessary fields from an extent_map.

        We also save 8 bytes from the extent_map structure by removing the
        'map_lookup' pointer, so the size of struct extent_map is reduced from
        144 bytes down to 136 bytes, and we can now have 30 extents map per 4K
        page instead of 28.

Change-Id: Ie52b5ac83df4bc6abeb84d958c4f5d24ae0d8c75
Signed-off-by: Kienan Stewart <kstewart@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 months agoFix: strlcpy removed in linux 6.8.0-rc1
Kienan Stewart [Mon, 22 Jan 2024 16:47:40 +0000 (11:47 -0500)] 
Fix: strlcpy removed in linux 6.8.0-rc1

See upstream commit:

    commit d26270061ae66b915138af7cd73ca6f8b85e6b44
    Author: Kees Cook <keescook@chromium.org>
    Date:   Thu Jan 18 12:31:55 2024 -0800

        string: Remove strlcpy()

        With all the users of strlcpy() removed[1] from the kernel, remove the
        API, self-tests, and other references. Leave mentions in Documentation
        (about its deprecation), and in checkpatch.pl (to help migrate host-only
        tools/ usage). Long live strscpy().

The replacement interface, `strscpy`, has been available since linux
4.3, introduced in the upstream commit
30c44659f4a3e7e1f9f47e895591b4b40bf62671.

As lttng-modules master branch targets linux 4.4+ at this time,
`strlcpy` can be replaced with `strscpy`.

Change-Id: I27cdff70a504b25340cc59150ed8e959d9629e43
Signed-off-by: Kienan Stewart <kstewart@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 months agoFix: timer_start changed in linux 6.8.0-rc1
Kienan Stewart [Mon, 22 Jan 2024 16:33:39 +0000 (11:33 -0500)] 
Fix: timer_start changed in linux 6.8.0-rc1

See upstream commit

    commit dbcdcb62b59db2cf6a24113873b90da15c6f0b19
    Author: Anna-Maria Behnsen <anna-maria@linutronix.de>
    Date:   Fri Dec 1 10:26:26 2023 +0100

        tracing/timers: Enhance timer_start tracepoint

        For starting a timer, the timer is enqueued into a bucket of the timer
        wheel. The bucket expiry is the defacto expiry of the timer but it is not
        equal the timer expiry because of increasing granularity when bucket is in
        a higher level of the wheel. To be able to figure out in a trace whether a
        timer expired in time or not, the bucket expiry time is required as well.

        Add bucket expiry time to the timer_start tracepoint and thereby simplify
        the arguments.

Change-Id: I4868092765745b1efd0c48f13c0b837f2007dcb6
Signed-off-by: Kienan Stewart <kstewart@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 months agoFix: sched_stat_runtime changed in linux 6.8.0-rc1
Kienan Stewart [Mon, 22 Jan 2024 16:10:37 +0000 (11:10 -0500)] 
Fix: sched_stat_runtime changed in linux 6.8.0-rc1

See upstream commit:

    commit 5fe6ec8f6ab549b6422e41551abb51802bd48bc7
    Author: Peter Zijlstra <peterz@infradead.org>
    Date:   Mon Nov 6 13:41:43 2023 +0100

        sched: Remove vruntime from trace_sched_stat_runtime()

        Tracing the runtime delta makes sense, observer can sum over time.
        Tracing the absolute vruntime makes less sense, inconsistent:
        absolute-vs-delta, but also vruntime delta can be computed from
        runtime delta.

        Removing the vruntime thing also makes the two tracepoint sites
        identical, allowing to unify the code in a later patch.

Change-Id: I24ebb4e06dbb646a1af75ac62b74f3821ff197de
Signed-off-by: Kienan Stewart <kstewart@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
10 months agoVersion 2.13.11 v2.13.11
Mathieu Desnoyers [Wed, 10 Jan 2024 20:35:48 +0000 (15:35 -0500)] 
Version 2.13.11

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: I0f91343f361271cc5b51f5fade12c7cc7ed90da4

10 months agoFix: Include linux/sched/rt.h for kernels v3.9 to v3.14
Mathieu Desnoyers [Wed, 10 Jan 2024 01:55:58 +0000 (20:55 -0500)] 
Fix: Include linux/sched/rt.h for kernels v3.9 to v3.14

From kernel v3.0 to v3.8, MAX_RT_PRIO is defined in linux/sched.h.

From kernel v3.9 to v3.14, MAX_RT_PRIO is defined in linux/sched/rt.h,
which is not included by linux/sched.h (hence this work-around).

From kernel v3.15 onwards, MAX_RT_PRIO is defined in linux/sched/prio.h,
which is included by linux/sched.h.

Add the missing linux/sched/rt.h include for the affected kernel version
range.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: Ie7e1d9dc710621deca04553a9b5ba7f9a4d83c15

10 months agoFix: Disable IBT around indirect function calls
Mathieu Desnoyers [Mon, 8 Jan 2024 18:31:04 +0000 (13:31 -0500)] 
Fix: Disable IBT around indirect function calls

When the Intel IBT feature is enabled, a CPU supporting this feature
validates that all indirect jumps/calls land on an ENDBR64 instruction.

The kernel seals functions which are not meant to be called indirectly,
which means that calling functions indirectly from their address fetched
using kallsyms or kprobes trigger a crash.

Use the MSR_IA32_S_CET CET_ENDBR_EN MSR bit to temporarily disable ENDBR
validation around indirect calls to kernel functions. Considering that
the main purpose of this feature is to prevent ROP-style attacks,
disabling the ENDBR validation temporarily around the call from a kernel
module does not affect the ROP protection.

Fixes #1408
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: I97f5d8efce093c1e956cede1f44de2fcebf30227

10 months agoInline implementation of task_prio()
Mathieu Desnoyers [Tue, 9 Jan 2024 15:36:31 +0000 (10:36 -0500)] 
Inline implementation of task_prio()

The task_prio() function has been implemented as "return p->prio -
MAX_RT_PRIO;" since at least kernel v3.0, so inline it into
lttng-modules rather than using kallsyms to call the kernel
implementation.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: I7dd482a2da72a005c16b3e5864767b47d7bc3fd3

10 months agoFix: prio context NULL pointer exception
Mathieu Desnoyers [Tue, 9 Jan 2024 15:33:13 +0000 (10:33 -0500)] 
Fix: prio context NULL pointer exception

A missing call to wrapper_task_prio_init() causes the function pointer
for task_prio to stay NULL, which triggers a OOPS when trying to use the
prio context.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: I417e84cb8a07db624e682c7ec2c033fbc2a7b8e7

11 months agoFix: MODULE_IMPORT_NS is introduced in kernel 5.4
Mathieu Desnoyers [Mon, 18 Dec 2023 18:17:07 +0000 (13:17 -0500)] 
Fix: MODULE_IMPORT_NS is introduced in kernel 5.4

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: I4c5faafb3a3ff8178b45c0e411113b17643bbc78

11 months agoAndroid: Import VFS namespace for android common kernel
Lei wang [Mon, 18 Dec 2023 10:16:33 +0000 (05:16 -0500)] 
Android: Import VFS namespace for android common kernel

Android GKI kernel add limitation on fs interface usage.
Need to import VFS namespace explicitly to make it workable
for lttng-modules.

Signed-off-by: Lei wang <quic_leiwan@quicinc.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
11 months agoFix: get_file_rcu is missing in kernels < 4.1
Mathieu Desnoyers [Fri, 1 Dec 2023 14:52:08 +0000 (09:52 -0500)] 
Fix: get_file_rcu is missing in kernels < 4.1

Open-code the get_file_rcu using atomic_long_inc_not_zero() for kernel
versions < 4.1.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: I0fa905b078165ede8b1837bb8d77891d05d0e8ed

11 months agofix: lookup_fd_rcu replaced by lookup_fdget_rcu in linux 6.7.0-rc1
Kienan Stewart [Mon, 20 Nov 2023 16:34:40 +0000 (11:34 -0500)] 
fix: lookup_fd_rcu replaced by lookup_fdget_rcu in linux 6.7.0-rc1

See upstream commit:

    commit 0ede61d8589cc2d93aa78230d74ac58b5b8d0244
    Author: Christian Brauner <brauner@kernel.org>
    Date:   Fri Sep 29 08:45:59 2023 +0200

        file: convert to SLAB_TYPESAFE_BY_RCU

        In recent discussions around some performance improvements in the file
        handling area we discussed switching the file cache to rely on
        SLAB_TYPESAFE_BY_RCU which allows us to get rid of call_rcu() based
        freeing for files completely. This is a pretty sensitive change overall
        but it might actually be worth doing.

        The main downside is the subtlety. The other one is that we should
        really wait for Jann's patch to land that enables KASAN to handle
        SLAB_TYPESAFE_BY_RCU UAFs. Currently it doesn't but a patch for this
        exists.

        With SLAB_TYPESAFE_BY_RCU objects may be freed and reused multiple times
        which requires a few changes. So it isn't sufficient anymore to just
        acquire a reference to the file in question under rcu using
        atomic_long_inc_not_zero() since the file might have already been
        recycled and someone else might have bumped the reference.

        In other words, callers might see reference count bumps from newer
        users. For this reason it is necessary to verify that the pointer is the
        same before and after the reference count increment. This pattern can be
        seen in get_file_rcu() and __files_get_rcu().

        In addition, it isn't possible to access or check fields in struct file
        without first aqcuiring a reference on it. Not doing that was always
        very dodgy and it was only usable for non-pointer data in struct file.
        With SLAB_TYPESAFE_BY_RCU it is necessary that callers first acquire a
        reference under rcu or they must hold the files_lock of the fdtable.
        Failing to do either one of this is a bug.

        Thanks to Jann for pointing out that we need to ensure memory ordering
        between reallocations and pointer check by ensuring that all subsequent
        loads have a dependency on the second load in get_file_rcu() and
        providing a fixup that was folded into this patch.

Signed-off-by: Kienan Stewart <kstewart@efficios.com>
Change-Id: Iba3663f19a54820afd31a8eeec24b3b5d4b06589
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
11 months agofix: mm, vmscan signatures changed in linux 6.7.0-rc1
Kienan Stewart [Mon, 20 Nov 2023 16:33:14 +0000 (11:33 -0500)] 
fix: mm, vmscan signatures changed in linux 6.7.0-rc1

See upstream commit:

    commit 3dfbb555c98ac55b9d911f9af0e35014b445fb41
    Author: Vlastimil Babka <vbabka@suse.cz>
    Date:   Thu Sep 14 15:16:39 2023 +0200

        mm, vmscan: remove ISOLATE_UNMAPPED

        This isolate_mode_t flag is effectively unused since 89f6c88a6ab4 ("mm:
        __isolate_lru_page_prepare() in isolate_migratepages_block()") as
        sc->may_unmap is now checked directly (and only node_reclaim has a mode
        that sets it to 0).  The last remaining place is mm_vmscan_lru_isolate
        tracepoint for the isolate_mode parameter.  That one was mainly used to
        indicate the active/inactive mode, which the trace-vmscan-postprocess.pl
        script consumed, but that got silently broken.  After fixing the script by
        the previous patch, it does not need the isolate_mode anymore.  So just
        remove the parameter and with that the whole ISOLATE_UNMAPPED flag.

Signed-off-by: Kienan Stewart <kstewart@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: Ie7346886d926a1a9d20bcb1570c587c5e943a1c3

11 months agofix: phys_proc_id and cpu_core_id moved in linux 6.7.0-rc1
Kienan Stewart [Mon, 20 Nov 2023 16:27:12 +0000 (11:27 -0500)] 
fix: phys_proc_id and cpu_core_id moved in linux 6.7.0-rc1

See upstream commit:

    commit 02fb601d27a7abf60d52b21bdf5b100a8d63da3f
    Author: Thomas Gleixner <tglx@linutronix.de>
    Date:   Mon Aug 14 10:18:30 2023 +0200

        x86/cpu: Move phys_proc_id into topology info

        Rename it to pkg_id which is the terminology used in the kernel.

        No functional change.

See upstream commit:

    commit e95256335d45cc965cd12c423535002974313340
    Author: Thomas Gleixner <tglx@linutronix.de>
    Date:   Mon Aug 14 10:18:34 2023 +0200

        x86/cpu: Move cpu_core_id into topology info

        Rename it to core_id and stick it to the other ID fields.

        No functional change.

Signed-off-by: Kienan Stewart <kstewart@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: I574b02430210d5bb72c4b9db901d0e3a6dc7bea0

13 months agoFix build for RHEL 8.8 with linux 4.18.0-477.10.1+
Kienan Stewart [Mon, 16 Oct 2023 14:10:09 +0000 (10:10 -0400)] 
Fix build for RHEL 8.8 with linux 4.18.0-477.10.1+

4.18.0-477.10.1 introduces backports a change which updates the
`kfree_skb` trace event to the 3-argument version used in more recent
kernel versions.

Change-Id: I5a1071a59659b76e1499beae3388159ca8ced1f7
Signed-off-by: Kienan Stewart <kstewart@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
13 months agoFix: bytecode validator: oops during validation of immediate string
Jérémie Galarneau [Thu, 5 Oct 2023 21:02:57 +0000 (17:02 -0400)] 
Fix: bytecode validator: oops during validation of immediate string

Issue observed
--------------

Running Linux 6.5.5, lttng-modules @ 6be48c9f, all built with gcc
13.2.1, I got a 'BUG' in dmesg while enabling the following event
rule:

  $ lttng enable-event --kernel --syscall --channel chanK --all --filter '$ctx.procname == "UST reg*"'

The relevant parts of the 'BUG' output follow:

  [  +0.715480] detected buffer overflow in strnlen
  [  +0.000001] kernel BUG at lib/string_helpers.c:1031!
  [  +0.000008] invalid opcode: 0000 [#1] PREEMPT SMP NOPTI
  [  +0.000003] CPU: 2 PID: 157174 Comm: Client manageme Tainted: G S   U     OE      6.5.5-arch1-1 #1 d82a0f532dd8cfe67d5795c1738d9c01059a0c62
  [  +0.000001] RIP: 0010:fortify_panic+0x13/0x20
  [  +0.000006] Code: 41 5d c3 cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 89 fe 48 c7 c7 90 22 c8 86 e8 3d aa b1 ff <0f> 0b 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90
  [  +0.000002] RSP: 0018:ffffa7c7c106f918 EFLAGS: 00010246
  [  +0.000002] RAX: 0000000000000023 RBX: 000000000000000b RCX: 0000000000000000
  [  +0.000002] RDX: 0000000000000000 RSI: ffff92766e4a16c0 RDI: ffff92766e4a16c0
  [  +0.000001] RBP: 0000000000000000 R08: 0000000000000000 R09: ffffa7c7c106f7c0
  [  +0.000001] R10: 0000000000000003 R11: ffffffff874ca068 R12: ffff927618202480
  [  +0.000001] R13: ffff9276182024d2 R14: ffff927453999c08 R15: ffff9273dc7aa478
  [  +0.000001] FS:  00007f06553f9680(0000) GS:ffff92766e480000(0000) knlGS:0000000000000000
  [  +0.000002] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  [  +0.000002] CR2: 0000556d54eceaa8 CR3: 00000001ad9de002 CR4: 00000000003706e0
  [  +0.000001] Call Trace:
  [  +0.000002]  <TASK>
  [  +0.000002]  ? die+0x36/0x90
  [  +0.000004]  ? do_trap+0xda/0x100
  [  +0.000003]  ? fortify_panic+0x13/0x20
  [  +0.000002]  ? do_error_trap+0x6a/0x90
  [  +0.000002]  ? fortify_panic+0x13/0x20
  [  +0.000002]  ? exc_invalid_op+0x50/0x70
  [  +0.000003]  ? fortify_panic+0x13/0x20
  [  +0.000002]  ? asm_exc_invalid_op+0x1a/0x20
  [  +0.000005]  ? fortify_panic+0x13/0x20
  [  +0.000002]  ? fortify_panic+0x13/0x20
  [  +0.000003]  bytecode_validate_overflow+0x155/0x1f0 [lttng_tracer 759e3e4fee0e774ef575e93b67e8dc7955d0c2c2]
  [  +0.000330]  lttng_bytecode_validate_load+0x32/0x1e0 [lttng_tracer 759e3e4fee0e774ef575e93b67e8dc7955d0c2c2]
  [  +0.000183]  lttng_enabler_link_bytecode+0x135/0x5a0 [lttng_tracer 759e3e4fee0e774ef575e93b67e8dc7955d0c2c2]
  [  +0.000132]  lttng_sync_event_list+0xef/0x650 [lttng_tracer 759e3e4fee0e774ef575e93b67e8dc7955d0c2c2]
  [  +0.000123]  ? __wake_up_common+0x73/0x180
  [  +0.000004]  lttng_session_enable+0x3e/0x130 [lttng_tracer 759e3e4fee0e774ef575e93b67e8dc7955d0c2c2]
  [  +0.000121]  lttng_session_ioctl+0x5db/0x720 [lttng_tracer 759e3e4fee0e774ef575e93b67e8dc7955d0c2c2]
  [  +0.000120]  ? __slab_free+0xf1/0x330
  [  +0.000004]  ? __scm_recv_common.isra.0+0x144/0x180
  [  +0.000004]  ? unix_stream_read_generic+0x233/0xb60
  [  +0.000006]  __x64_sys_ioctl+0x94/0xd0
  [  +0.000004]  do_syscall_64+0x5d/0x90
  [  +0.000004]  ? switch_fpu_return+0x50/0xe0
  [  +0.000004]  ? exit_to_user_mode_prepare+0x132/0x1e0
  [  +0.000003]  ? syscall_exit_to_user_mode+0x2b/0x40
  [  +0.000002]  ? do_syscall_64+0x6c/0x90
  [  +0.000003]  ? do_syscall_64+0x6c/0x90
  [  +0.000002]  ? do_syscall_64+0x6c/0x90
  [  +0.000002]  ? do_syscall_64+0x6c/0x90
  [  +0.000002]  ? syscall_exit_to_user_mode+0x2b/0x40
  [  +0.000002]  ? do_syscall_64+0x6c/0x90
  [  +0.000002]  ? do_syscall_64+0x6c/0x90
  [  +0.000002]  ? do_syscall_64+0x6c/0x90
  [  +0.000002]  ? do_syscall_64+0x6c/0x90
  [  +0.000002]  ? exc_page_fault+0x7f/0x180
  [  +0.000003]  entry_SYSCALL_64_after_hwframe+0x6e/0xd8

Cause
-----

`struct load_op` has a trailing 0-length array `data` member that is
used to refer, in the context of BYTECODE_OP_LOAD_STAR_GLOB_STRING, to
an immediate string operand that follows it.

During the validation of a filtering bytecode, strnlen is properly used
to determine the size of the immediate string operand, with a `maxlen`
parameter that is used to ensure the string operand is contained within
the bytecode (see lttng-bytecode-validator.c:434).

However, recent KSPP-related changes have enabled additional overrun
checks when statically-sized and flexible arrays are used. Those are
enabled when the kernel is built with CONFIG_UBSAN_BOUNDS and/or
CONFIG_FORTIFY_SOURCE configured.

The KBUILD CFLAGS now contain `-fstrict-flex-arrays=3`, which is
recognized by gcc 13+[1] and allows proper coverage of dynamically sized
trailing arrays when those configuration options are used.

With those validations in place, the kernel assumes that the `data`
array is truly of length 0 and it BUGs to warn of an invalid access.

The commit linked above contains a number of links explaining the
rationale for transitioning uses of the trailing zero-length arrays (a
gcc extension) to C99 flexible array members (FAM).

This was discussed at this year's GNU Cauldron [2].

Solution
--------

Uses of zero-length arrays (`foo[0]`) are replaced by flexible array
members (`foo[]`). The only cases that are left untouched are those
where the zero-length array is used to indicate the end of a
structure (i.e. it doesn't indicate that a variable number of elements
follow), see the `metadata_packet_header`, `metadata_record_header`,
`event_notifier_packet_header`, and `event_notifier_record_header`
structures.

It may be desirable to use the new `counted_by` attribute for some of
those in the future (`lttng_kernel_abi_filter_bytecode`,
`lttng_kernel_abi_capture_bytecode`, and `bytecode_runtime`) [3].

Note
----

While this is tagged as a memory handling 'fix', it has no security
implication as far as I can tell. The accesses that are flagged by the
new validations were valid.

This merely allows the runtime validations to understand the memory
layout properly.

[1] https://github.com/torvalds/linux/commit/df8fc4e934c12b906d08050d7779f292b9c5c6b5
[2] https://gcc.gnu.org/wiki/cauldron2023talks?action=AttachFile&do=get&target=Most-wanted+Security+Features+in+GCC+for+Linux+Kernel.pdf
[3] https://lwn.net/Articles/930943/

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: Id39b101aaafe68f8fae6b86cd61806cba8cb1e6a

13 months agofix: lttng-probe-kvm-x86-mmu build with linux 6.6
Kienan Stewart [Tue, 26 Sep 2023 18:45:09 +0000 (14:45 -0400)] 
fix: lttng-probe-kvm-x86-mmu build with linux 6.6

A small change was made upstream in `spte.h` that requires
`arch/x86/kvm` to be added to the search path when
building lttng-probe-kvm.x86-mmu.o.

See upstream commit :

  commit d10f3780bc2f80744d291e118c0c8bade54ed3b8
  Author: Sean Christopherson <seanjc@google.com>
  Date:   Tue Aug 8 15:40:59 2023 -0700

      KVM: x86/mmu: Include mmu.h in spte.h

      Explicitly include mmu.h in spte.h instead of relying on the "parent" to
      include mmu.h.  spte.h references a variety of macros and variables that
      are defined/declared in mmu.h, and so including spte.h before (or instead
      of) mmu.h will result in build errors, e.g.

Signed-off-by: Kienan Stewart <kstewart@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: I5c3fc87d3b006cefbcca198e6e15868a342cb8dd

15 months agofix: built-in lttng with kernel >= v6.1
Michael Jeanson [Fri, 18 Aug 2023 15:28:30 +0000 (11:28 -0400)] 
fix: built-in lttng with kernel >= v6.1

In kernel v6.1 the list of subdirectories was moved from Makefile to
Kbuild. Adjust our built-in.sh script to detect this change and use the
appropriate file to graft ourself to the kernel build system.

Thanks to Richa Bharti for the initial patch.

See upstream commit:

  commit 5750121ae7382ebac8d47ce6d68012d6cd1d7926
  Author: Masahiro Yamada <masahiroy@kernel.org>
  Date:   Sun Sep 25 03:19:10 2022 +0900

    kbuild: list sub-directories in ./Kbuild

    Use the ordinary obj-y syntax to list subdirectories.

Change-Id: Ifc0f1bdea5ee59b0e0b96cdb31c9c689deb20559
Reported-by: Richa Bharti <Richa.Bharti@siemens.com>
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
16 months agofix: ubuntu kinetic kernel range for jdb2
Michael Jeanson [Fri, 7 Jul 2023 17:27:15 +0000 (13:27 -0400)] 
fix: ubuntu kinetic kernel range for jdb2

Kinetic introduces a 'lowlatency' kernel with a different ABI number
than the 'generic' flavor, add 2 ranges accordingly.

Change-Id: I89427e30672f3f25b2f6d698d6e1cabfb45d9366
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
17 months agoVersion 2.13.10 v2.13.10
Mathieu Desnoyers [Wed, 7 Jun 2023 14:53:24 +0000 (10:53 -0400)] 
Version 2.13.10

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: I9d1d358ba28dd0f9f68b54c52e784d002d9bc74c

19 months agoAdd support for RHEL 9.1
Michael Jeanson [Fri, 14 Apr 2023 19:09:25 +0000 (15:09 -0400)] 
Add support for RHEL 9.1

Change-Id: I2aaa8e385448b1e46c3c16edc4f36f2eb6906e76
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
19 months agoAdd support for RHEL 9.0
Michael Jeanson [Tue, 19 Jul 2022 19:07:22 +0000 (15:07 -0400)] 
Add support for RHEL 9.0

Change-Id: Ia01527c3d6243805445734f00f4f2f945efd16e7
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
19 months agofix: kallsyms wrapper on CONFIG_PPC64_ELF_ABI_V1
Michael Jeanson [Tue, 29 Nov 2022 17:10:17 +0000 (12:10 -0500)] 
fix: kallsyms wrapper on CONFIG_PPC64_ELF_ABI_V1

Change-Id: Ibdff5792a1511b678f7776f5d032758db739c5ad
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
20 months agofix: net: add location to trace_consume_skb() (v6.3)
Michael Jeanson [Tue, 7 Mar 2023 16:10:26 +0000 (11:10 -0500)] 
fix: net: add location to trace_consume_skb() (v6.3)

See upstream commit :

  commit dd1b527831a3ed659afa01b672d8e1f7e6ca95a5
  Author: Eric Dumazet <edumazet@google.com>
  Date:   Thu Feb 16 15:47:18 2023 +0000

    net: add location to trace_consume_skb()

    kfree_skb() includes the location, it makes sense
    to add it to consume_skb() as well.

Change-Id: I8d871187d90e7fe113a63e209b00aebe0df475f3
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
20 months agofix: btrfs: pass find_free_extent_ctl to allocator tracepoints (v6.3)
Michael Jeanson [Tue, 7 Mar 2023 16:26:25 +0000 (11:26 -0500)] 
fix: btrfs: pass find_free_extent_ctl to allocator tracepoints (v6.3)

See upstream commit :

  commit cfc2de0fce015d4249c674ef9f5e0b4817ba5c53
  Author: Boris Burkov <boris@bur.io>
  Date:   Thu Dec 15 16:06:31 2022 -0800

    btrfs: pass find_free_extent_ctl to allocator tracepoints

    The allocator tracepoints currently have a pile of values from ffe_ctl.
    In modifying the allocator and adding more tracepoints, I found myself
    adding to the already long argument list of the tracepoints. It makes it
    a lot simpler to just send in the ffe_ctl itself.

Change-Id: Iab4132a9d3df3a6369591a50fb75374b1e399fa4
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
20 months agofix: uuid: Decouple guid_t and uuid_le types and respective macros (v6.3)
Michael Jeanson [Tue, 7 Mar 2023 17:05:00 +0000 (12:05 -0500)] 
fix: uuid: Decouple guid_t and uuid_le types and respective macros (v6.3)

See upstream commit :

  commit 5e6a51787fef20b849682d8c49ec9c2beed5c373
  Author: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
  Date:   Tue Jan 24 15:38:38 2023 +0200

    uuid: Decouple guid_t and uuid_le types and respective macros

    The guid_t type and respective macros are being used internally only.
    The uuid_le has its user outside the kernel. Decouple these types and
    macros, and make guid_t completely internal type to the kernel.

Change-Id: I8644fd139b0630e9cf18886b84e33bffab1e5abd
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
20 months agofix: mm: introduce vma->vm_flags wrapper functions (v6.3)
Michael Jeanson [Tue, 7 Mar 2023 16:41:14 +0000 (11:41 -0500)] 
fix: mm: introduce vma->vm_flags wrapper functions (v6.3)

See upstream commit :

  commit bc292ab00f6c7a661a8a605c714e8a148f629ef6
  Author: Suren Baghdasaryan <surenb@google.com>
  Date:   Thu Jan 26 11:37:47 2023 -0800

    mm: introduce vma->vm_flags wrapper functions

    vm_flags are among VMA attributes which affect decisions like VMA merging
    and splitting.  Therefore all vm_flags modifications are performed after
    taking exclusive mmap_lock to prevent vm_flags updates racing with such
    operations.  Introduce modifier functions for vm_flags to be used whenever
    flags are updated.  This way we can better check and control correct
    locking behavior during these updates.

Change-Id: I2cf662420d9d7748e5e310d3ea4bac98ba7d7f94
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
20 months agoVersion 2.13.9 v2.13.9
Mathieu Desnoyers [Fri, 3 Mar 2023 15:39:24 +0000 (10:39 -0500)] 
Version 2.13.9

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: Ie5399d8f24102ee78aa6950222aa64289bbdb6ed

22 months agofix: jbd2: use the correct print format (v5.4.229)
Michael Jeanson [Wed, 18 Jan 2023 21:32:04 +0000 (16:32 -0500)] 
fix: jbd2: use the correct print format (v5.4.229)

See upstream commit :

  commit ecb9d0d2e123874bcdd2efdecda0f4e0c3dc566d
  Author: Bixuan Cui <cuibixuan@linux.alibaba.com>
  Date:   Tue Oct 11 19:33:44 2022 +0800

    jbd2: use the correct print format

    [ Upstream commit d87a7b4c77a997d5388566dd511ca8e6b8e8a0a8 ]

    The print format error was found when using ftrace event:
        <...>-1406 [000] .... 23599442.895823: jbd2_end_commit: dev 252,8 transaction -1866216965 sync 0 head -1866217368
        <...>-1406 [000] .... 23599442.896299: jbd2_start_commit: dev 252,8 transaction -1866216964 sync 0

    Use the correct print format for transaction, head and tid.

Change-Id: Ieee3d39ed1f2515e096e87d18b5ea8f921c54bd0
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
22 months agofix: jbd2 upper bound for v5.10.163
Michael Jeanson [Tue, 17 Jan 2023 17:16:04 +0000 (12:16 -0500)] 
fix: jbd2 upper bound for v5.10.163

Use the correct upper bound of 5,11,0.

Change-Id: I435b44b940c7346ed8c3ef0d445365ed156702d0
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
22 months agofix: jbd2: use the correct print format (v5.10.163)
Michael Jeanson [Tue, 17 Jan 2023 16:03:12 +0000 (11:03 -0500)] 
fix: jbd2: use the correct print format (v5.10.163)

See upstream commit :

  commit d87a7b4c77a997d5388566dd511ca8e6b8e8a0a8
  Author: Bixuan Cui <cuibixuan@linux.alibaba.com>
  Date:   Tue Oct 11 19:33:44 2022 +0800

    jbd2: use the correct print format

    The print format error was found when using ftrace event:
        <...>-1406 [000] .... 23599442.895823: jbd2_end_commit: dev 252,8 transaction -1866216965 sync 0 head -1866217368
        <...>-1406 [000] .... 23599442.896299: jbd2_start_commit: dev 252,8 transaction -1866216964 sync 0

    Use the correct print format for transaction, head and tid.

Change-Id: I7601f5cbb86495c2607be7b11e02724c90b3ebf9
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
22 months agofix: btrfs: move accessor helpers into accessors.h (v6.2)
Michael Jeanson [Mon, 16 Jan 2023 20:01:51 +0000 (15:01 -0500)] 
fix: btrfs: move accessor helpers into accessors.h (v6.2)

See upstream commit :

  commit 07e81dc94474eb62705c6f96d9ab1a5a797b8703
  Author: Josef Bacik <josef@toxicpanda.com>
  Date:   Wed Oct 19 10:51:00 2022 -0400

    btrfs: move accessor helpers into accessors.h

    This is a large patch, but because they're all macros it's impossible to
    split up.  Simply copy all of the item accessors in ctree.h and paste
    them in accessors.h, and then update any files to include the header so
    everything compiles.

Change-Id: I1f0876dd8b7a8687f6802b60c3e3baabd017cc52
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
22 months agoVersion 2.13.8 v2.13.8
Mathieu Desnoyers [Fri, 13 Jan 2023 21:08:06 +0000 (16:08 -0500)] 
Version 2.13.8

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: I3686e4e44475aa8cd6aa435f74e4994f5e36da2e

22 months agofix: jbd2: use the correct print format
Michael Jeanson [Thu, 12 Jan 2023 18:52:22 +0000 (13:52 -0500)] 
fix: jbd2: use the correct print format

See upstream commit :

  commit d87a7b4c77a997d5388566dd511ca8e6b8e8a0a8
  Author: Bixuan Cui <cuibixuan@linux.alibaba.com>
  Date:   Tue Oct 11 19:33:44 2022 +0800

    jbd2: use the correct print format

    The print format error was found when using ftrace event:
        <...>-1406 [000] .... 23599442.895823: jbd2_end_commit: dev 252,8 transaction -1866216965 sync 0 head -1866217368
        <...>-1406 [000] .... 23599442.896299: jbd2_start_commit: dev 252,8 transaction -1866216964 sync 0

    Use the correct print format for transaction, head and tid.

Change-Id: Ic053f0e0c1e24ebc75bae51d07696aaa5e1c0094
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
23 months agoFix: in_x32_syscall was introduced in v4.7.0
Mathieu Desnoyers [Thu, 1 Dec 2022 16:33:20 +0000 (11:33 -0500)] 
Fix: in_x32_syscall was introduced in v4.7.0

Prior to v4.7.0, is_x32_task() was the API to query whether the current
system call is following the x32 ABI.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: I783bd3bb46ec5e863ae209f79cee2f1bb415e661

23 months agoExplicitly skip tracing x32 system calls
Mathieu Desnoyers [Wed, 30 Nov 2022 20:41:02 +0000 (15:41 -0500)] 
Explicitly skip tracing x32 system calls

x86 x32 system calls are not supported by LTTng. They are currently not
traced simply because their system call number is beyond the range of
NR_compat_syscalls.

However, this mostly happens by accident rather than by design.

Enforce this with an explicit check for in_x32_syscall(), which clearly
documents that those are not supported.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: I1235c32c5cf03612bf9c36785cf7c4f8f49d292b

2 years agofix: kallsyms wrapper on ppc64el
Michael Jeanson [Thu, 24 Nov 2022 19:25:33 +0000 (14:25 -0500)] 
fix: kallsyms wrapper on ppc64el

The 'PPC64_ELF_ABI_v2' macro in 'asm/types.h' was removed in v5.19 and
replaced by a config option 'CONFIG_PPC64_ELF_ABI_V2'.

See upstream commit :

  commit 5b89492c03e5c0a2c259b97d7d4c1bb9b02860aa
  Author: Christophe Leroy <christophe.leroy@csgroup.eu>
  Date:   Mon May 9 07:36:08 2022 +0200

    powerpc: Finalise cleanup around ABI use

    Now that we have CONFIG_PPC64_ELF_ABI_V1 and CONFIG_PPC64_ELF_ABI_V2,
    get rid of all indirect detection of ABI version.

Link: https://lore.kernel.org/r/709d9d69523c14c8a9fba4486395dca0f2d675b1.1652074503.git.christophe.leroy@csgroup.eu
Change-Id: Ibd00e35cab5516a6224bdfa5a6b540119b42dc55
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
2 years agofix: Adjust ranges for RHEL 8.6 kernels
Michael Jeanson [Fri, 11 Nov 2022 15:47:54 +0000 (10:47 -0500)] 
fix: Adjust ranges for RHEL 8.6 kernels

Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: I0b2c90f3678d0fb4503f61f336a4af185de2b39d

2 years agofix: kvm-x86 requires CONFIG_KALLSYMS_ALL
Michael Jeanson [Tue, 8 Nov 2022 16:26:46 +0000 (11:26 -0500)] 
fix: kvm-x86 requires CONFIG_KALLSYMS_ALL

Fixes: #1363
Change-Id: I6da15f77123c393ccb9109b562c7c8dc5bbb96a5
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
2 years agofix: mm/slab_common: drop kmem_alloc & avoid dereferencing fields when not using...
Michael Jeanson [Mon, 17 Oct 2022 17:49:51 +0000 (13:49 -0400)] 
fix: mm/slab_common: drop kmem_alloc & avoid dereferencing fields when not using (v6.1)

See uptream commit:

  commit 2c1d697fb8ba6d2d44f914d4268ae1ccdf025f1b
  Author: Hyeonggon Yoo <42.hyeyoo@gmail.com>
  Date:   Wed Aug 17 19:18:24 2022 +0900

    mm/slab_common: drop kmem_alloc & avoid dereferencing fields when not using

    Drop kmem_alloc event class, and define kmalloc and kmem_cache_alloc
    using TRACE_EVENT() macro.

    And then this patch does:
       - Do not pass pointer to struct kmem_cache to trace_kmalloc.
         gfp flag is enough to know if it's accounted or not.
       - Avoid dereferencing s->object_size and s->size when not using kmem_cache_alloc event.
       - Avoid dereferencing s->name in when not using kmem_cache_free event.
       - Adjust s->size to SLOB_UNITS(s->size) * SLOB_UNIT in SLOB

Change-Id: Icd7925731ed4a737699c3746cb7bb7760a4e8009
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
2 years agoVersion 2.13.7 v2.13.7
Mathieu Desnoyers [Fri, 30 Sep 2022 21:11:06 +0000 (17:11 -0400)] 
Version 2.13.7

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: I28620e23756e3e91965839801ea8828b3f2b919c

2 years agoFix: handle integer capture page faults as skip field
Mathieu Desnoyers [Fri, 30 Sep 2022 20:19:16 +0000 (16:19 -0400)] 
Fix: handle integer capture page faults as skip field

Now that we have the appropriate save/restore position mechanism for
error handling in place, we can handle page faults on integer
copy-from-user by skipping the offending captured field entirely rather
than relying on an arbitrary 0 value.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: I4ec6243d96753ce7e9c6230563713aeacb126567

2 years agoVersion 2.13.6 v2.13.6
Mathieu Desnoyers [Fri, 30 Sep 2022 19:18:34 +0000 (15:18 -0400)] 
Version 2.13.6

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: Idecfca64078038637c4a790adac84d87893d2bdd

2 years agoFix: bytecode validator: reject specialized load field/context ref instructions
Mathieu Desnoyers [Fri, 30 Sep 2022 14:14:18 +0000 (10:14 -0400)] 
Fix: bytecode validator: reject specialized load field/context ref instructions

Reject specialized load field/context ref instructions so a bytecode
crafted with nefarious intent cannot:

- Read user-space memory without proper get_user accessors,
- Read a memory area larger than the memory targeted by the instrumentation.

This prevents bytecode received from a tracing group user from oopsing
the kernel or disclosing the content of kernel memory to the tracing
group

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: I2bda938a3a050f20be1d3d542aefe638b1b8bf73

2 years agoFix: bytecode validator: reject specialized load instructions
Mathieu Desnoyers [Thu, 29 Sep 2022 19:29:21 +0000 (15:29 -0400)] 
Fix: bytecode validator: reject specialized load instructions

Reject specialized load instructions so a bytecode crafted with
nefarious intent cannot:

- Read user-space memory without proper get_user accessors,
- Read a memory area larger than the memory targeted by the instrumentation.

This prevents bytecode received from a tracing group user from oopsing
the kernel or disclosing the content of kernel memory to the tracing
group.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: I6bcdf37d4a8601164082b3c24358bf0e765a2c92

2 years agoFix: honor "user" attribute for array/sequence of user integers
Mathieu Desnoyers [Thu, 29 Sep 2022 18:26:27 +0000 (14:26 -0400)] 
Fix: honor "user" attribute for array/sequence of user integers

The macro _lttng_kernel_static_type_integer_from_type() should map to
_lttng_kernel_static_type_integer() to pass the "_user" attribute.
Otherwise, userspace fields such as pipe2's system call fildes field (a
ctf_user_array()) can trigger NULL pointer exceptions and read arbitrary
kernel memory if the pipe2 system call receives a bogus pointer as input
while filtering/capture is accessing this field.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: I44276d751b822f214804184d1ce4d9b10b47d89d

2 years agowrapper: powerpc64: fix kernel crash caused by do_get_kallsyms
He Zhe [Tue, 27 Sep 2022 07:59:42 +0000 (15:59 +0800)] 
wrapper: powerpc64: fix kernel crash caused by do_get_kallsyms

Kernel crashes on powerpc64 ABIv2 as follow when lttng_tracer initializes,
since do_get_kallsyms in lttng_wrapper fails to return a proper address of
kallsyms_lookup_name.

root@qemuppc64:~# lttng create trace_session --live -U net://127.0.0.1
Spawning a session daemon
lttng_kretprobes: loading out-of-tree module taints kernel.
BUG: Unable to handle kernel data access on read at 0xfffffffffffffff8
Faulting instruction address: 0xc0000000001f6fd0
Oops: Kernel access of bad area, sig: 11 [#1]
<snip>
NIP [c0000000001f6fd0] module_kallsyms_lookup_name+0xf0/0x180
LR [c0000000001f6f28] module_kallsyms_lookup_name+0x48/0x180
Call Trace:
module_kallsyms_lookup_name+0x34/0x180 (unreliable)
kallsyms_lookup_name+0x258/0x2b0
wrapper_kallsyms_lookup_name+0x4c/0xd0 [lttng_wrapper]
wrapper_get_pfnblock_flags_mask_init+0x28/0x60 [lttng_wrapper]
lttng_events_init+0x40/0x344 [lttng_tracer]
do_one_initcall+0x78/0x340
do_init_module+0x6c/0x2f0
__do_sys_finit_module+0xd0/0x120
system_call_exception+0x194/0x2f0
system_call_vectored_common+0xe8/0x278
<snip>

do_get_kallsyms makes use of kprobe_register and in turn kprobe_lookup_name
to get the address of the kernel function kallsyms_lookup_name. In case of
PPC64_ELF_ABI_v2, when kprobes are placed at function entry,
kprobe_lookup_name adjusts the global entry point of the function returned
by kallsyms_lookup_name to the local entry point(at some fixed offset of
global one). This adjustment is all for kprobes to be able to work properly.
Global and local entry point are defined in powerpc64 ABIv2.

When the local entry point is given, some instructions at the beginning of
the function are skipped and thus causes the above kernel crash. We just
want to make a simple function call which needs global entry point.

This patch adds 4 bytes which is the length of one instruction to
kallsyms_lookup_name so that it will not trigger the global to local
adjustment, and then substracts 4 bytes from the returned address. See the
following kernel change for more details.

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=290e3070762ac80e5fc4087d8c4de7e3f1d90aca

Signed-off-by: He Zhe <zhe.he@windriver.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: I34e68e886b97e3976d0b5e25be295a8bb866c1a4

2 years agoFix: event notification: Remove duplicate event enabled check
Mathieu Desnoyers [Wed, 28 Sep 2022 14:44:05 +0000 (10:44 -0400)] 
Fix: event notification: Remove duplicate event enabled check

The event enabled checks are already done by the event notification
callers, so there is no point in checking it again.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: I8033c053d6a601cf646a008d5325d556dba5a8f9

2 years agoFix: event notification capture: validate buffer length
Mathieu Desnoyers [Wed, 28 Sep 2022 14:34:42 +0000 (10:34 -0400)] 
Fix: event notification capture: validate buffer length

Validate that the buffer length is large enough to hold empty capture
fields.

If the buffer is initially not large enough to hold empty capture fields
for each field to capture, discard the notification.

If after capturing a field there is not enough room anymore in the
buffer to write empty capture fields, skip the offending large field by
writing an empty capture field in its place.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: Ifa2cdaf084e2ebee2efa052331107cb4d9095243

2 years agoFix: handle capture page faults as skip field
Mathieu Desnoyers [Tue, 27 Sep 2022 20:31:29 +0000 (16:31 -0400)] 
Fix: handle capture page faults as skip field

Now that we have the appropriate save/restore position mechanism for
error handling in place, we can handle page faults on copy-from-user by
skipping the offending captured field entirely rather than relying on an
empty string.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: Ibe1e818f57f8218d2b83281a572895884fc28b86

2 years agoFix: event notification capture error handling
Mathieu Desnoyers [Tue, 27 Sep 2022 19:07:24 +0000 (15:07 -0400)] 
Fix: event notification capture error handling

When the captured fields end up taking more than 512 bytes of space for
the msgpack message, the notification append capture fails.

Currently, this is handled by printing a WARN_ON_ONCE() on the console,
and a printk "Error appending capture to notification" warning.

Considering that this kind of error is very much legitimate, spamming
the console with warnings is not the way we want to handle this.

Rather than print a warning on the console, reset the msgpack writer
position to skip the problematic captured field entirely when it is
erroneous.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: I4c98dc85266dd7af5e11bbd3d73ab5118c9e03af

2 years agoFix: capture_sequence_element_{un,}signed: handle user-space input
Mathieu Desnoyers [Mon, 5 Sep 2022 22:19:16 +0000 (18:19 -0400)] 
Fix: capture_sequence_element_{un,}signed: handle user-space input

The "user" attribute (copy from userspace) is not applied to
sequence/array of integer field capture within event notifications. This
could eventually lead to unsafe copy of integers from user-space.

Currently, the only array/sequence of integers which are read from
user-space are the arguments to sys_select (e.g. `readfds` field). Those
are expressed as "custom" fields, which are skipped by the filter and
capture bytecode.

This is therefore not an issue with the current instrumentation, but we
should properly handle this nevertheless.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: Icf0c141d333f63402d8a76051bcd53fcdd5ed8c2

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