1 /* SPDX-License-Identifier: (GPL-2.0 or LGPL-2.1)
3 * lttng-context-user-ns.c
5 * LTTng user namespace context.
7 * Copyright (C) 2009-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 * 2019 Michael Jeanson <mjeanson@efficios.com>
12 #include <linux/module.h>
13 #include <linux/slab.h>
14 #include <linux/sched.h>
15 #include <linux/user_namespace.h>
16 #include <lttng-events.h>
17 #include <wrapper/ringbuffer/frontend_types.h>
18 #include <wrapper/vmalloc.h>
19 #include <wrapper/namespace.h>
20 #include <lttng-tracer.h>
22 #if defined(CONFIG_USER_NS) && \
23 (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,8,0))
26 size_t user_ns_get_size(size_t offset
)
30 size
+= lib_ring_buffer_align(offset
, lttng_alignof(unsigned int));
31 size
+= sizeof(unsigned int);
36 void user_ns_record(struct lttng_ctx_field
*field
,
37 struct lib_ring_buffer_ctx
*ctx
,
38 struct lttng_channel
*chan
)
40 unsigned int user_ns_inum
= 0;
42 if (current_user_ns())
43 user_ns_inum
= current_user_ns()->lttng_ns_inum
;
45 lib_ring_buffer_align_ctx(ctx
, lttng_alignof(user_ns_inum
));
46 chan
->ops
->event_write(ctx
, &user_ns_inum
, sizeof(user_ns_inum
));
50 void user_ns_get_value(struct lttng_ctx_field
*field
,
51 struct lttng_probe_ctx
*lttng_probe_ctx
,
52 union lttng_ctx_value
*value
)
54 unsigned int user_ns_inum
= 0;
56 if (current_user_ns())
57 user_ns_inum
= current_user_ns()->lttng_ns_inum
;
59 value
->s64
= user_ns_inum
;
62 int lttng_add_user_ns_to_ctx(struct lttng_ctx
**ctx
)
64 struct lttng_ctx_field
*field
;
66 field
= lttng_append_context(ctx
);
69 if (lttng_find_context(*ctx
, "user_ns")) {
70 lttng_remove_context_field(ctx
, field
);
73 field
->event_field
.name
= "user_ns";
74 field
->event_field
.type
.atype
= atype_integer
;
75 field
->event_field
.type
.u
.basic
.integer
.size
= sizeof(unsigned int) * CHAR_BIT
;
76 field
->event_field
.type
.u
.basic
.integer
.alignment
= lttng_alignof(unsigned int) * CHAR_BIT
;
77 field
->event_field
.type
.u
.basic
.integer
.signedness
= lttng_is_signed_type(unsigned int);
78 field
->event_field
.type
.u
.basic
.integer
.reverse_byte_order
= 0;
79 field
->event_field
.type
.u
.basic
.integer
.base
= 10;
80 field
->event_field
.type
.u
.basic
.integer
.encoding
= lttng_encode_none
;
81 field
->get_size
= user_ns_get_size
;
82 field
->record
= user_ns_record
;
83 field
->get_value
= user_ns_get_value
;
84 lttng_context_update(*ctx
);
85 wrapper_vmalloc_sync_mappings();
88 EXPORT_SYMBOL_GPL(lttng_add_user_ns_to_ctx
);
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