Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  * Copyright (C) 2017 Hari Bathini, IBM Corporation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) #include "namespaces.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #include "event.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include "get_current_dir_name.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <sys/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <sys/stat.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <fcntl.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <limits.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <stdlib.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <stdio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <unistd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <asm/bug.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #include <linux/zalloc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) static const char *perf_ns__names[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 	[NET_NS_INDEX]		= "net",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 	[UTS_NS_INDEX]		= "uts",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 	[IPC_NS_INDEX]		= "ipc",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 	[PID_NS_INDEX]		= "pid",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 	[USER_NS_INDEX]		= "user",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 	[MNT_NS_INDEX]		= "mnt",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 	[CGROUP_NS_INDEX]	= "cgroup",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) const char *perf_ns__name(unsigned int id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 	if (id >= ARRAY_SIZE(perf_ns__names))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 		return "UNKNOWN";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 	return perf_ns__names[id];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) struct namespaces *namespaces__new(struct perf_record_namespaces *event)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 	struct namespaces *namespaces;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	u64 link_info_size = ((event ? event->nr_namespaces : NR_NAMESPACES) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 			      sizeof(struct perf_ns_link_info));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 	namespaces = zalloc(sizeof(struct namespaces) + link_info_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 	if (!namespaces)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 		return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	namespaces->end_time = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	if (event)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 		memcpy(namespaces->link_info, event->link_info, link_info_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	return namespaces;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) void namespaces__free(struct namespaces *namespaces)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	free(namespaces);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) int nsinfo__init(struct nsinfo *nsi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	char oldns[PATH_MAX];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	char spath[PATH_MAX];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	char *newns = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	char *statln = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 	struct stat old_stat;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	struct stat new_stat;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 	FILE *f = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	size_t linesz = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	int rv = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	if (snprintf(oldns, PATH_MAX, "/proc/self/ns/mnt") >= PATH_MAX)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 		return rv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 	if (asprintf(&newns, "/proc/%d/ns/mnt", nsi->pid) == -1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 		return rv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	if (stat(oldns, &old_stat) < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 	if (stat(newns, &new_stat) < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	/* Check if the mount namespaces differ, if so then indicate that we
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	 * want to switch as part of looking up dso/map data.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	if (old_stat.st_ino != new_stat.st_ino) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 		nsi->need_setns = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 		nsi->mntns_path = newns;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 		newns = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	/* If we're dealing with a process that is in a different PID namespace,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	 * attempt to work out the innermost tgid for the process.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	if (snprintf(spath, PATH_MAX, "/proc/%d/status", nsi->pid) >= PATH_MAX)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	f = fopen(spath, "r");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	if (f == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	while (getline(&statln, &linesz, f) != -1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 		/* Use tgid if CONFIG_PID_NS is not defined. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 		if (strstr(statln, "Tgid:") != NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 			nsi->tgid = (pid_t)strtol(strrchr(statln, '\t'),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 						     NULL, 10);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 			nsi->nstgid = nsi->tgid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 		if (strstr(statln, "NStgid:") != NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 			nsi->nstgid = (pid_t)strtol(strrchr(statln, '\t'),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 						     NULL, 10);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	rv = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 	if (f != NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 		(void) fclose(f);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	free(statln);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	free(newns);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	return rv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) struct nsinfo *nsinfo__new(pid_t pid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 	struct nsinfo *nsi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	if (pid == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 		return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 	nsi = calloc(1, sizeof(*nsi));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 	if (nsi != NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 		nsi->pid = pid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 		nsi->tgid = pid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 		nsi->nstgid = pid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 		nsi->need_setns = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 		/* Init may fail if the process exits while we're trying to look
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 		 * at its proc information.  In that case, save the pid but
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 		 * don't try to enter the namespace.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 		if (nsinfo__init(nsi) == -1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 			nsi->need_setns = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 		refcount_set(&nsi->refcnt, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 	return nsi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) struct nsinfo *nsinfo__copy(struct nsinfo *nsi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 	struct nsinfo *nnsi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	if (nsi == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 		return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 	nnsi = calloc(1, sizeof(*nnsi));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 	if (nnsi != NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 		nnsi->pid = nsi->pid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 		nnsi->tgid = nsi->tgid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 		nnsi->nstgid = nsi->nstgid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 		nnsi->need_setns = nsi->need_setns;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 		if (nsi->mntns_path) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 			nnsi->mntns_path = strdup(nsi->mntns_path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 			if (!nnsi->mntns_path) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 				free(nnsi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 				return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 		refcount_set(&nnsi->refcnt, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 	return nnsi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) void nsinfo__delete(struct nsinfo *nsi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	zfree(&nsi->mntns_path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	free(nsi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) struct nsinfo *nsinfo__get(struct nsinfo *nsi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	if (nsi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 		refcount_inc(&nsi->refcnt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 	return nsi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) void nsinfo__put(struct nsinfo *nsi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	if (nsi && refcount_dec_and_test(&nsi->refcnt))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 		nsinfo__delete(nsi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) void nsinfo__mountns_enter(struct nsinfo *nsi,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 				  struct nscookie *nc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	char curpath[PATH_MAX];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 	int oldns = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	int newns = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 	char *oldcwd = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	if (nc == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 	nc->oldns = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	nc->newns = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 	if (!nsi || !nsi->need_setns)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 	if (snprintf(curpath, PATH_MAX, "/proc/self/ns/mnt") >= PATH_MAX)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 	oldcwd = get_current_dir_name();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	if (!oldcwd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	oldns = open(curpath, O_RDONLY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 	if (oldns < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 		goto errout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 	newns = open(nsi->mntns_path, O_RDONLY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 	if (newns < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 		goto errout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 	if (setns(newns, CLONE_NEWNS) < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 		goto errout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 	nc->oldcwd = oldcwd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 	nc->oldns = oldns;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 	nc->newns = newns;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 	return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) errout:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 	free(oldcwd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 	if (oldns > -1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 		close(oldns);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 	if (newns > -1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 		close(newns);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) void nsinfo__mountns_exit(struct nscookie *nc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 	if (nc == NULL || nc->oldns == -1 || nc->newns == -1 || !nc->oldcwd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 	setns(nc->oldns, CLONE_NEWNS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	if (nc->oldcwd) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 		WARN_ON_ONCE(chdir(nc->oldcwd));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 		zfree(&nc->oldcwd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 	if (nc->oldns > -1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 		close(nc->oldns);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 		nc->oldns = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 	if (nc->newns > -1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 		close(nc->newns);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 		nc->newns = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) char *nsinfo__realpath(const char *path, struct nsinfo *nsi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 	char *rpath;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 	struct nscookie nsc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 	nsinfo__mountns_enter(nsi, &nsc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 	rpath = realpath(path, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 	nsinfo__mountns_exit(&nsc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 	return rpath;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) }