1 /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
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 <lttng-tracer.h>
20 #if defined(CONFIG_USER_NS) && \
21 (LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0))
24 size_t user_ns_get_size(size_t offset
)
28 size
+= lib_ring_buffer_align(offset
, lttng_alignof(unsigned int));
29 size
+= sizeof(unsigned int);
34 void user_ns_record(struct lttng_ctx_field
*field
,
35 struct lib_ring_buffer_ctx
*ctx
,
36 struct lttng_channel
*chan
)
38 unsigned int user_ns_inum
= 0;
40 if (current_user_ns())
41 user_ns_inum
= current_user_ns()->ns
.inum
;
43 lib_ring_buffer_align_ctx(ctx
, lttng_alignof(user_ns_inum
));
44 chan
->ops
->event_write(ctx
, &user_ns_inum
, sizeof(user_ns_inum
));
48 void user_ns_get_value(struct lttng_ctx_field
*field
,
49 struct lttng_probe_ctx
*lttng_probe_ctx
,
50 union lttng_ctx_value
*value
)
52 unsigned int user_ns_inum
= 0;
54 if (current_user_ns())
55 user_ns_inum
= current_user_ns()->ns
.inum
;
57 value
->s64
= user_ns_inum
;
60 int lttng_add_user_ns_to_ctx(struct lttng_ctx
**ctx
)
62 struct lttng_ctx_field
*field
;
64 field
= lttng_append_context(ctx
);
67 if (lttng_find_context(*ctx
, "user_ns")) {
68 lttng_remove_context_field(ctx
, field
);
71 field
->event_field
.name
= "user_ns";
72 field
->event_field
.type
.atype
= atype_integer
;
73 field
->event_field
.type
.u
.integer
.size
= sizeof(unsigned int) * CHAR_BIT
;
74 field
->event_field
.type
.u
.integer
.alignment
= lttng_alignof(unsigned int) * CHAR_BIT
;
75 field
->event_field
.type
.u
.integer
.signedness
= lttng_is_signed_type(unsigned int);
76 field
->event_field
.type
.u
.integer
.reverse_byte_order
= 0;
77 field
->event_field
.type
.u
.integer
.base
= 10;
78 field
->event_field
.type
.u
.integer
.encoding
= lttng_encode_none
;
79 field
->get_size
= user_ns_get_size
;
80 field
->record
= user_ns_record
;
81 field
->get_value
= user_ns_get_value
;
82 lttng_context_update(*ctx
);
85 EXPORT_SYMBOL_GPL(lttng_add_user_ns_to_ctx
);
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