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b7cdc182 | 1 | /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only) |
dc923e75 MJ |
2 | * |
3 | * lttng-context-vegid.c | |
4 | * | |
5 | * LTTng namespaced effective group ID context. | |
6 | * | |
7 | * Copyright (C) 2009-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
8 | * 2019 Michael Jeanson <mjeanson@efficios.com> | |
9 | * | |
10 | */ | |
11 | ||
12 | #include <linux/module.h> | |
13 | #include <linux/sched.h> | |
2df37e95 | 14 | #include <lttng/events.h> |
437d5aa5 | 15 | #include <lttng/events-internal.h> |
2df37e95 | 16 | #include <lttng/tracer.h> |
24591303 | 17 | #include <ringbuffer/frontend_types.h> |
dc923e75 MJ |
18 | #include <wrapper/vmalloc.h> |
19 | #include <wrapper/user_namespace.h> | |
20 | ||
21 | static | |
22 | size_t vegid_get_size(size_t offset) | |
23 | { | |
24 | size_t size = 0; | |
25 | ||
26 | size += lib_ring_buffer_align(offset, lttng_alignof(gid_t)); | |
27 | size += sizeof(gid_t); | |
28 | return size; | |
29 | } | |
30 | ||
31 | static | |
437d5aa5 | 32 | void vegid_record(struct lttng_kernel_ctx_field *field, |
dc923e75 MJ |
33 | struct lib_ring_buffer_ctx *ctx, |
34 | struct lttng_channel *chan) | |
35 | { | |
36 | gid_t vegid; | |
37 | ||
38 | vegid = lttng_current_vegid(); | |
39 | lib_ring_buffer_align_ctx(ctx, lttng_alignof(vegid)); | |
40 | chan->ops->event_write(ctx, &vegid, sizeof(vegid)); | |
41 | } | |
42 | ||
43 | static | |
437d5aa5 | 44 | void vegid_get_value(struct lttng_kernel_ctx_field *field, |
dc923e75 MJ |
45 | struct lttng_probe_ctx *lttng_probe_ctx, |
46 | union lttng_ctx_value *value) | |
47 | { | |
48 | value->s64 = lttng_current_vegid(); | |
49 | } | |
50 | ||
437d5aa5 MD |
51 | static const struct lttng_kernel_ctx_field *ctx_field = lttng_kernel_static_ctx_field( |
52 | lttng_kernel_static_event_field("vegid", | |
53 | lttng_kernel_static_type_integer_from_type(gid_t, __BYTE_ORDER, 10), | |
54 | false, false, false), | |
55 | vegid_get_size, | |
56 | NULL, | |
57 | vegid_record, | |
58 | vegid_get_value, | |
59 | NULL, NULL); | |
60 | ||
61 | int lttng_add_vegid_to_ctx(struct lttng_kernel_ctx **ctx) | |
dc923e75 | 62 | { |
437d5aa5 | 63 | int ret; |
dc923e75 | 64 | |
437d5aa5 | 65 | if (lttng_kernel_find_context(*ctx, ctx_field->event_field->name)) |
dc923e75 | 66 | return -EEXIST; |
437d5aa5 | 67 | ret = lttng_kernel_context_append(ctx, ctx_field); |
263b6c88 | 68 | wrapper_vmalloc_sync_mappings(); |
437d5aa5 | 69 | return ret; |
dc923e75 MJ |
70 | } |
71 | EXPORT_SYMBOL_GPL(lttng_add_vegid_to_ctx); |