1 /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
3 * lttng-context-vsuid.c
5 * LTTng namespaced saved set-user-ID 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/sched.h>
14 #include <lttng/events.h>
15 #include <lttng/events-internal.h>
16 #include <lttng/tracer.h>
17 #include <ringbuffer/frontend_types.h>
18 #include <wrapper/vmalloc.h>
19 #include <wrapper/user_namespace.h>
22 size_t vsuid_get_size(size_t offset
)
26 size
+= lib_ring_buffer_align(offset
, lttng_alignof(uid_t
));
27 size
+= sizeof(uid_t
);
32 void vsuid_record(struct lttng_kernel_ctx_field
*field
,
33 struct lib_ring_buffer_ctx
*ctx
,
34 struct lttng_channel
*chan
)
38 vsuid
= lttng_current_vsuid();
39 lib_ring_buffer_align_ctx(ctx
, lttng_alignof(vsuid
));
40 chan
->ops
->event_write(ctx
, &vsuid
, sizeof(vsuid
));
44 void vsuid_get_value(struct lttng_kernel_ctx_field
*field
,
45 struct lttng_probe_ctx
*lttng_probe_ctx
,
46 union lttng_ctx_value
*value
)
48 value
->s64
= lttng_current_vsuid();
51 static const struct lttng_kernel_ctx_field
*ctx_field
= lttng_kernel_static_ctx_field(
52 lttng_kernel_static_event_field("vsuid",
53 lttng_kernel_static_type_integer_from_type(uid_t
, __BYTE_ORDER
, 10),
61 int lttng_add_vsuid_to_ctx(struct lttng_kernel_ctx
**ctx
)
65 if (lttng_kernel_find_context(*ctx
, ctx_field
->event_field
->name
))
67 ret
= lttng_kernel_context_append(ctx
, ctx_field
);
68 wrapper_vmalloc_sync_mappings();
71 EXPORT_SYMBOL_GPL(lttng_add_vsuid_to_ctx
);
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