2019-06-04 08:11:33 +00:00
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// SPDX-License-Identifier: GPL-2.0-only
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perf tools: Add PERF_RECORD_NAMESPACES to include namespaces related info
Introduce a new option to record PERF_RECORD_NAMESPACES events emitted
by the kernel when fork, clone, setns or unshare are invoked. And update
perf-record documentation with the new option to record namespace
events.
Committer notes:
Combined it with a later patch to allow printing it via 'perf report -D'
and be able to test the feature introduced in this patch. Had to move
here also perf_ns__name(), that was introduced in another later patch.
Also used PRIu64 and PRIx64 to fix the build in some enfironments wrt:
util/event.c:1129:39: error: format '%lx' expects argument of type 'long unsigned int', but argument 6 has type 'long long unsigned int' [-Werror=format=]
ret += fprintf(fp, "%u/%s: %lu/0x%lx%s", idx
^
Testing it:
# perf record --namespaces -a
^C[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 1.083 MB perf.data (423 samples) ]
#
# perf report -D
<SNIP>
3 2028902078892 0x115140 [0xa0]: PERF_RECORD_NAMESPACES 14783/14783 - nr_namespaces: 7
[0/net: 3/0xf0000081, 1/uts: 3/0xeffffffe, 2/ipc: 3/0xefffffff, 3/pid: 3/0xeffffffc,
4/user: 3/0xeffffffd, 5/mnt: 3/0xf0000000, 6/cgroup: 3/0xeffffffb]
0x1151e0 [0x30]: event: 9
.
. ... raw event: size 48 bytes
. 0000: 09 00 00 00 02 00 30 00 c4 71 82 68 0c 7f 00 00 ......0..q.h....
. 0010: a9 39 00 00 a9 39 00 00 94 28 fe 63 d8 01 00 00 .9...9...(.c....
. 0020: 03 00 00 00 00 00 00 00 ce c4 02 00 00 00 00 00 ................
<SNIP>
NAMESPACES events: 1
<SNIP>
#
Signed-off-by: Hari Bathini <hbathini@linux.vnet.ibm.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alexei Starovoitov <ast@fb.com>
Cc: Ananth N Mavinakayanahalli <ananth@linux.vnet.ibm.com>
Cc: Aravinda Prasad <aravinda@linux.vnet.ibm.com>
Cc: Brendan Gregg <brendan.d.gregg@gmail.com>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Eric Biederman <ebiederm@xmission.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Sargun Dhillon <sargun@sargun.me>
Cc: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/r/148891930386.25309.18412039920746995488.stgit@hbathini.in.ibm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2017-03-07 20:41:43 +00:00
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/*
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*
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* Copyright (C) 2017 Hari Bathini, IBM Corporation
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*/
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#include "namespaces.h"
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#include "event.h"
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2019-07-05 17:16:15 +00:00
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#include "get_current_dir_name.h"
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2017-07-06 01:48:08 +00:00
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#include <sys/types.h>
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#include <sys/stat.h>
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2017-09-11 13:50:26 +00:00
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#include <fcntl.h>
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2017-07-06 01:48:10 +00:00
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#include <limits.h>
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2017-07-06 01:48:08 +00:00
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#include <sched.h>
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perf tools: Add PERF_RECORD_NAMESPACES to include namespaces related info
Introduce a new option to record PERF_RECORD_NAMESPACES events emitted
by the kernel when fork, clone, setns or unshare are invoked. And update
perf-record documentation with the new option to record namespace
events.
Committer notes:
Combined it with a later patch to allow printing it via 'perf report -D'
and be able to test the feature introduced in this patch. Had to move
here also perf_ns__name(), that was introduced in another later patch.
Also used PRIu64 and PRIx64 to fix the build in some enfironments wrt:
util/event.c:1129:39: error: format '%lx' expects argument of type 'long unsigned int', but argument 6 has type 'long long unsigned int' [-Werror=format=]
ret += fprintf(fp, "%u/%s: %lu/0x%lx%s", idx
^
Testing it:
# perf record --namespaces -a
^C[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 1.083 MB perf.data (423 samples) ]
#
# perf report -D
<SNIP>
3 2028902078892 0x115140 [0xa0]: PERF_RECORD_NAMESPACES 14783/14783 - nr_namespaces: 7
[0/net: 3/0xf0000081, 1/uts: 3/0xeffffffe, 2/ipc: 3/0xefffffff, 3/pid: 3/0xeffffffc,
4/user: 3/0xeffffffd, 5/mnt: 3/0xf0000000, 6/cgroup: 3/0xeffffffb]
0x1151e0 [0x30]: event: 9
.
. ... raw event: size 48 bytes
. 0000: 09 00 00 00 02 00 30 00 c4 71 82 68 0c 7f 00 00 ......0..q.h....
. 0010: a9 39 00 00 a9 39 00 00 94 28 fe 63 d8 01 00 00 .9...9...(.c....
. 0020: 03 00 00 00 00 00 00 00 ce c4 02 00 00 00 00 00 ................
<SNIP>
NAMESPACES events: 1
<SNIP>
#
Signed-off-by: Hari Bathini <hbathini@linux.vnet.ibm.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alexei Starovoitov <ast@fb.com>
Cc: Ananth N Mavinakayanahalli <ananth@linux.vnet.ibm.com>
Cc: Aravinda Prasad <aravinda@linux.vnet.ibm.com>
Cc: Brendan Gregg <brendan.d.gregg@gmail.com>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Eric Biederman <ebiederm@xmission.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Sargun Dhillon <sargun@sargun.me>
Cc: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/r/148891930386.25309.18412039920746995488.stgit@hbathini.in.ibm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2017-03-07 20:41:43 +00:00
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#include <stdlib.h>
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#include <stdio.h>
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2017-04-19 22:06:30 +00:00
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#include <string.h>
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2017-07-06 01:48:08 +00:00
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#include <unistd.h>
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2018-11-01 17:00:01 +00:00
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#include <asm/bug.h>
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2019-09-18 19:08:52 +00:00
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#include <linux/kernel.h>
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2019-07-04 14:32:27 +00:00
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#include <linux/zalloc.h>
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perf tools: Add PERF_RECORD_NAMESPACES to include namespaces related info
Introduce a new option to record PERF_RECORD_NAMESPACES events emitted
by the kernel when fork, clone, setns or unshare are invoked. And update
perf-record documentation with the new option to record namespace
events.
Committer notes:
Combined it with a later patch to allow printing it via 'perf report -D'
and be able to test the feature introduced in this patch. Had to move
here also perf_ns__name(), that was introduced in another later patch.
Also used PRIu64 and PRIx64 to fix the build in some enfironments wrt:
util/event.c:1129:39: error: format '%lx' expects argument of type 'long unsigned int', but argument 6 has type 'long long unsigned int' [-Werror=format=]
ret += fprintf(fp, "%u/%s: %lu/0x%lx%s", idx
^
Testing it:
# perf record --namespaces -a
^C[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 1.083 MB perf.data (423 samples) ]
#
# perf report -D
<SNIP>
3 2028902078892 0x115140 [0xa0]: PERF_RECORD_NAMESPACES 14783/14783 - nr_namespaces: 7
[0/net: 3/0xf0000081, 1/uts: 3/0xeffffffe, 2/ipc: 3/0xefffffff, 3/pid: 3/0xeffffffc,
4/user: 3/0xeffffffd, 5/mnt: 3/0xf0000000, 6/cgroup: 3/0xeffffffb]
0x1151e0 [0x30]: event: 9
.
. ... raw event: size 48 bytes
. 0000: 09 00 00 00 02 00 30 00 c4 71 82 68 0c 7f 00 00 ......0..q.h....
. 0010: a9 39 00 00 a9 39 00 00 94 28 fe 63 d8 01 00 00 .9...9...(.c....
. 0020: 03 00 00 00 00 00 00 00 ce c4 02 00 00 00 00 00 ................
<SNIP>
NAMESPACES events: 1
<SNIP>
#
Signed-off-by: Hari Bathini <hbathini@linux.vnet.ibm.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alexei Starovoitov <ast@fb.com>
Cc: Ananth N Mavinakayanahalli <ananth@linux.vnet.ibm.com>
Cc: Aravinda Prasad <aravinda@linux.vnet.ibm.com>
Cc: Brendan Gregg <brendan.d.gregg@gmail.com>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Eric Biederman <ebiederm@xmission.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Sargun Dhillon <sargun@sargun.me>
Cc: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/r/148891930386.25309.18412039920746995488.stgit@hbathini.in.ibm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2017-03-07 20:41:43 +00:00
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2019-09-18 19:08:52 +00:00
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static const char *perf_ns__names[] = {
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[NET_NS_INDEX] = "net",
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[UTS_NS_INDEX] = "uts",
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[IPC_NS_INDEX] = "ipc",
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[PID_NS_INDEX] = "pid",
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[USER_NS_INDEX] = "user",
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[MNT_NS_INDEX] = "mnt",
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[CGROUP_NS_INDEX] = "cgroup",
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};
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const char *perf_ns__name(unsigned int id)
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{
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if (id >= ARRAY_SIZE(perf_ns__names))
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return "UNKNOWN";
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return perf_ns__names[id];
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}
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2019-08-26 22:02:31 +00:00
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struct namespaces *namespaces__new(struct perf_record_namespaces *event)
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perf tools: Add PERF_RECORD_NAMESPACES to include namespaces related info
Introduce a new option to record PERF_RECORD_NAMESPACES events emitted
by the kernel when fork, clone, setns or unshare are invoked. And update
perf-record documentation with the new option to record namespace
events.
Committer notes:
Combined it with a later patch to allow printing it via 'perf report -D'
and be able to test the feature introduced in this patch. Had to move
here also perf_ns__name(), that was introduced in another later patch.
Also used PRIu64 and PRIx64 to fix the build in some enfironments wrt:
util/event.c:1129:39: error: format '%lx' expects argument of type 'long unsigned int', but argument 6 has type 'long long unsigned int' [-Werror=format=]
ret += fprintf(fp, "%u/%s: %lu/0x%lx%s", idx
^
Testing it:
# perf record --namespaces -a
^C[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 1.083 MB perf.data (423 samples) ]
#
# perf report -D
<SNIP>
3 2028902078892 0x115140 [0xa0]: PERF_RECORD_NAMESPACES 14783/14783 - nr_namespaces: 7
[0/net: 3/0xf0000081, 1/uts: 3/0xeffffffe, 2/ipc: 3/0xefffffff, 3/pid: 3/0xeffffffc,
4/user: 3/0xeffffffd, 5/mnt: 3/0xf0000000, 6/cgroup: 3/0xeffffffb]
0x1151e0 [0x30]: event: 9
.
. ... raw event: size 48 bytes
. 0000: 09 00 00 00 02 00 30 00 c4 71 82 68 0c 7f 00 00 ......0..q.h....
. 0010: a9 39 00 00 a9 39 00 00 94 28 fe 63 d8 01 00 00 .9...9...(.c....
. 0020: 03 00 00 00 00 00 00 00 ce c4 02 00 00 00 00 00 ................
<SNIP>
NAMESPACES events: 1
<SNIP>
#
Signed-off-by: Hari Bathini <hbathini@linux.vnet.ibm.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alexei Starovoitov <ast@fb.com>
Cc: Ananth N Mavinakayanahalli <ananth@linux.vnet.ibm.com>
Cc: Aravinda Prasad <aravinda@linux.vnet.ibm.com>
Cc: Brendan Gregg <brendan.d.gregg@gmail.com>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Eric Biederman <ebiederm@xmission.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Sargun Dhillon <sargun@sargun.me>
Cc: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/r/148891930386.25309.18412039920746995488.stgit@hbathini.in.ibm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2017-03-07 20:41:43 +00:00
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{
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struct namespaces *namespaces;
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u64 link_info_size = ((event ? event->nr_namespaces : NR_NAMESPACES) *
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sizeof(struct perf_ns_link_info));
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namespaces = zalloc(sizeof(struct namespaces) + link_info_size);
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if (!namespaces)
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return NULL;
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namespaces->end_time = -1;
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if (event)
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memcpy(namespaces->link_info, event->link_info, link_info_size);
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return namespaces;
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}
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void namespaces__free(struct namespaces *namespaces)
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{
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free(namespaces);
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}
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2017-07-06 01:48:08 +00:00
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2021-12-12 13:47:20 +00:00
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static int nsinfo__get_nspid(struct nsinfo *nsi, const char *path)
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{
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FILE *f = NULL;
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char *statln = NULL;
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size_t linesz = 0;
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char *nspid;
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f = fopen(path, "r");
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if (f == NULL)
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return -1;
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while (getline(&statln, &linesz, f) != -1) {
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/* Use tgid if CONFIG_PID_NS is not defined. */
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if (strstr(statln, "Tgid:") != NULL) {
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nsi->tgid = (pid_t)strtol(strrchr(statln, '\t'),
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NULL, 10);
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2022-02-11 10:34:06 +00:00
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nsi->nstgid = nsinfo__tgid(nsi);
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2021-12-12 13:47:20 +00:00
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}
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if (strstr(statln, "NStgid:") != NULL) {
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nspid = strrchr(statln, '\t');
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nsi->nstgid = (pid_t)strtol(nspid, NULL, 10);
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/*
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* If innermost tgid is not the first, process is in a different
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* PID namespace.
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*/
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nsi->in_pidns = (statln + sizeof("NStgid:") - 1) != nspid;
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break;
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}
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}
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fclose(f);
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free(statln);
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return 0;
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}
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2017-07-06 01:48:09 +00:00
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int nsinfo__init(struct nsinfo *nsi)
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2017-07-06 01:48:08 +00:00
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{
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char oldns[PATH_MAX];
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2017-07-06 01:48:09 +00:00
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char spath[PATH_MAX];
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2017-07-06 01:48:08 +00:00
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char *newns = NULL;
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struct stat old_stat;
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struct stat new_stat;
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2017-07-06 01:48:09 +00:00
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int rv = -1;
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2017-07-06 01:48:08 +00:00
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if (snprintf(oldns, PATH_MAX, "/proc/self/ns/mnt") >= PATH_MAX)
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2017-07-06 01:48:09 +00:00
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return rv;
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2017-07-06 01:48:08 +00:00
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2022-02-11 10:34:06 +00:00
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if (asprintf(&newns, "/proc/%d/ns/mnt", nsinfo__pid(nsi)) == -1)
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2017-07-06 01:48:09 +00:00
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return rv;
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2017-07-06 01:48:08 +00:00
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if (stat(oldns, &old_stat) < 0)
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goto out;
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if (stat(newns, &new_stat) < 0)
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goto out;
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/* Check if the mount namespaces differ, if so then indicate that we
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* want to switch as part of looking up dso/map data.
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*/
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if (old_stat.st_ino != new_stat.st_ino) {
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nsi->need_setns = true;
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nsi->mntns_path = newns;
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newns = NULL;
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}
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2017-07-06 01:48:09 +00:00
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/* If we're dealing with a process that is in a different PID namespace,
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* attempt to work out the innermost tgid for the process.
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*/
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2022-02-11 10:34:06 +00:00
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if (snprintf(spath, PATH_MAX, "/proc/%d/status", nsinfo__pid(nsi)) >= PATH_MAX)
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2017-07-06 01:48:09 +00:00
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goto out;
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2021-12-12 13:47:20 +00:00
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rv = nsinfo__get_nspid(nsi, spath);
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2017-07-06 01:48:09 +00:00
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2017-07-06 01:48:08 +00:00
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out:
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free(newns);
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2017-07-06 01:48:09 +00:00
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return rv;
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2017-07-06 01:48:08 +00:00
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}
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struct nsinfo *nsinfo__new(pid_t pid)
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{
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2017-07-06 01:48:09 +00:00
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struct nsinfo *nsi;
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2017-07-06 01:48:08 +00:00
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2017-07-06 01:48:09 +00:00
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if (pid == 0)
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return NULL;
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nsi = calloc(1, sizeof(*nsi));
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2017-07-06 01:48:08 +00:00
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if (nsi != NULL) {
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nsi->pid = pid;
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2017-07-06 01:48:09 +00:00
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nsi->tgid = pid;
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nsi->nstgid = pid;
|
2017-07-06 01:48:08 +00:00
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nsi->need_setns = false;
|
2020-11-05 01:54:18 +00:00
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nsi->in_pidns = false;
|
2017-07-06 01:48:09 +00:00
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/* Init may fail if the process exits while we're trying to look
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* at its proc information. In that case, save the pid but
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* don't try to enter the namespace.
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*/
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if (nsinfo__init(nsi) == -1)
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nsi->need_setns = false;
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2017-07-06 01:48:08 +00:00
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refcount_set(&nsi->refcnt, 1);
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}
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return nsi;
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}
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|
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|
2022-02-11 10:34:06 +00:00
|
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struct nsinfo *nsinfo__copy(const struct nsinfo *nsi)
|
2017-07-06 01:48:09 +00:00
|
|
|
{
|
|
|
|
struct nsinfo *nnsi;
|
|
|
|
|
2018-08-10 13:36:13 +00:00
|
|
|
if (nsi == NULL)
|
|
|
|
return NULL;
|
|
|
|
|
2017-07-06 01:48:09 +00:00
|
|
|
nnsi = calloc(1, sizeof(*nnsi));
|
|
|
|
if (nnsi != NULL) {
|
2022-02-11 10:34:06 +00:00
|
|
|
nnsi->pid = nsinfo__pid(nsi);
|
|
|
|
nnsi->tgid = nsinfo__tgid(nsi);
|
|
|
|
nnsi->nstgid = nsinfo__nstgid(nsi);
|
|
|
|
nnsi->need_setns = nsinfo__need_setns(nsi);
|
|
|
|
nnsi->in_pidns = nsinfo__in_pidns(nsi);
|
2017-07-06 01:48:09 +00:00
|
|
|
if (nsi->mntns_path) {
|
|
|
|
nnsi->mntns_path = strdup(nsi->mntns_path);
|
|
|
|
if (!nnsi->mntns_path) {
|
|
|
|
free(nnsi);
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
refcount_set(&nnsi->refcnt, 1);
|
|
|
|
}
|
|
|
|
|
|
|
|
return nnsi;
|
|
|
|
}
|
|
|
|
|
2022-02-11 10:34:06 +00:00
|
|
|
static void nsinfo__delete(struct nsinfo *nsi)
|
2017-07-06 01:48:08 +00:00
|
|
|
{
|
|
|
|
zfree(&nsi->mntns_path);
|
|
|
|
free(nsi);
|
|
|
|
}
|
|
|
|
|
|
|
|
struct nsinfo *nsinfo__get(struct nsinfo *nsi)
|
|
|
|
{
|
|
|
|
if (nsi)
|
|
|
|
refcount_inc(&nsi->refcnt);
|
|
|
|
return nsi;
|
|
|
|
}
|
|
|
|
|
|
|
|
void nsinfo__put(struct nsinfo *nsi)
|
|
|
|
{
|
|
|
|
if (nsi && refcount_dec_and_test(&nsi->refcnt))
|
|
|
|
nsinfo__delete(nsi);
|
|
|
|
}
|
|
|
|
|
2022-02-11 10:34:06 +00:00
|
|
|
bool nsinfo__need_setns(const struct nsinfo *nsi)
|
|
|
|
{
|
|
|
|
return nsi->need_setns;
|
|
|
|
}
|
|
|
|
|
|
|
|
void nsinfo__clear_need_setns(struct nsinfo *nsi)
|
|
|
|
{
|
|
|
|
nsi->need_setns = false;
|
|
|
|
}
|
|
|
|
|
|
|
|
pid_t nsinfo__tgid(const struct nsinfo *nsi)
|
|
|
|
{
|
|
|
|
return nsi->tgid;
|
|
|
|
}
|
|
|
|
|
|
|
|
pid_t nsinfo__nstgid(const struct nsinfo *nsi)
|
|
|
|
{
|
|
|
|
return nsi->nstgid;
|
|
|
|
}
|
|
|
|
|
|
|
|
pid_t nsinfo__pid(const struct nsinfo *nsi)
|
|
|
|
{
|
|
|
|
return nsi->pid;
|
|
|
|
}
|
|
|
|
|
|
|
|
pid_t nsinfo__in_pidns(const struct nsinfo *nsi)
|
|
|
|
{
|
|
|
|
return nsi->in_pidns;
|
|
|
|
}
|
|
|
|
|
2017-07-06 01:48:09 +00:00
|
|
|
void nsinfo__mountns_enter(struct nsinfo *nsi,
|
|
|
|
struct nscookie *nc)
|
2017-07-06 01:48:08 +00:00
|
|
|
{
|
|
|
|
char curpath[PATH_MAX];
|
|
|
|
int oldns = -1;
|
|
|
|
int newns = -1;
|
2018-11-01 17:00:01 +00:00
|
|
|
char *oldcwd = NULL;
|
2017-07-06 01:48:08 +00:00
|
|
|
|
|
|
|
if (nc == NULL)
|
|
|
|
return;
|
|
|
|
|
|
|
|
nc->oldns = -1;
|
|
|
|
nc->newns = -1;
|
|
|
|
|
|
|
|
if (!nsi || !nsi->need_setns)
|
|
|
|
return;
|
|
|
|
|
|
|
|
if (snprintf(curpath, PATH_MAX, "/proc/self/ns/mnt") >= PATH_MAX)
|
|
|
|
return;
|
|
|
|
|
2018-11-01 17:00:01 +00:00
|
|
|
oldcwd = get_current_dir_name();
|
|
|
|
if (!oldcwd)
|
|
|
|
return;
|
|
|
|
|
2017-07-06 01:48:08 +00:00
|
|
|
oldns = open(curpath, O_RDONLY);
|
|
|
|
if (oldns < 0)
|
2018-11-01 17:00:01 +00:00
|
|
|
goto errout;
|
2017-07-06 01:48:08 +00:00
|
|
|
|
|
|
|
newns = open(nsi->mntns_path, O_RDONLY);
|
|
|
|
if (newns < 0)
|
|
|
|
goto errout;
|
|
|
|
|
|
|
|
if (setns(newns, CLONE_NEWNS) < 0)
|
|
|
|
goto errout;
|
|
|
|
|
2018-11-01 17:00:01 +00:00
|
|
|
nc->oldcwd = oldcwd;
|
2017-07-06 01:48:08 +00:00
|
|
|
nc->oldns = oldns;
|
|
|
|
nc->newns = newns;
|
|
|
|
return;
|
|
|
|
|
|
|
|
errout:
|
2018-11-01 17:00:01 +00:00
|
|
|
free(oldcwd);
|
2017-07-06 01:48:08 +00:00
|
|
|
if (oldns > -1)
|
|
|
|
close(oldns);
|
|
|
|
if (newns > -1)
|
|
|
|
close(newns);
|
|
|
|
}
|
|
|
|
|
|
|
|
void nsinfo__mountns_exit(struct nscookie *nc)
|
|
|
|
{
|
2018-11-01 17:00:01 +00:00
|
|
|
if (nc == NULL || nc->oldns == -1 || nc->newns == -1 || !nc->oldcwd)
|
2017-07-06 01:48:08 +00:00
|
|
|
return;
|
|
|
|
|
|
|
|
setns(nc->oldns, CLONE_NEWNS);
|
|
|
|
|
2018-11-01 17:00:01 +00:00
|
|
|
if (nc->oldcwd) {
|
|
|
|
WARN_ON_ONCE(chdir(nc->oldcwd));
|
|
|
|
zfree(&nc->oldcwd);
|
|
|
|
}
|
|
|
|
|
2017-07-06 01:48:08 +00:00
|
|
|
if (nc->oldns > -1) {
|
|
|
|
close(nc->oldns);
|
|
|
|
nc->oldns = -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (nc->newns > -1) {
|
|
|
|
close(nc->newns);
|
|
|
|
nc->newns = -1;
|
|
|
|
}
|
|
|
|
}
|
2017-07-06 01:48:10 +00:00
|
|
|
|
|
|
|
char *nsinfo__realpath(const char *path, struct nsinfo *nsi)
|
|
|
|
{
|
|
|
|
char *rpath;
|
|
|
|
struct nscookie nsc;
|
|
|
|
|
|
|
|
nsinfo__mountns_enter(nsi, &nsc);
|
|
|
|
rpath = realpath(path, NULL);
|
|
|
|
nsinfo__mountns_exit(&nsc);
|
|
|
|
|
|
|
|
return rpath;
|
|
|
|
}
|
2020-11-05 01:56:04 +00:00
|
|
|
|
|
|
|
int nsinfo__stat(const char *filename, struct stat *st, struct nsinfo *nsi)
|
|
|
|
{
|
|
|
|
int ret;
|
|
|
|
struct nscookie nsc;
|
|
|
|
|
|
|
|
nsinfo__mountns_enter(nsi, &nsc);
|
|
|
|
ret = stat(filename, st);
|
|
|
|
nsinfo__mountns_exit(&nsc);
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
2021-12-12 13:47:20 +00:00
|
|
|
|
|
|
|
bool nsinfo__is_in_root_namespace(void)
|
|
|
|
{
|
|
|
|
struct nsinfo nsi;
|
|
|
|
|
|
|
|
memset(&nsi, 0x0, sizeof(nsi));
|
|
|
|
nsinfo__get_nspid(&nsi, "/proc/self/status");
|
|
|
|
return !nsi.in_pidns;
|
|
|
|
}
|