aecdef08be
Failed to enter shared memory directory multipath: Permission denied → Failed to enter shared memory directory /dev/shm/multipath: Permission denied When looking at nested directories, we will print only the final two elements of the path. That is still more useful than just the last component of the path. To print the full path, we'd have to allocate the string, and since the error occurs so very rarely, I think the current best-effort approach is enough.
455 lines
14 KiB
C
455 lines
14 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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#include <errno.h>
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#include <fcntl.h>
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#include <limits.h>
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#include <mqueue.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <sys/ipc.h>
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#include <sys/msg.h>
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#include <sys/sem.h>
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#include <sys/shm.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include "clean-ipc.h"
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#include "dirent-util.h"
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#include "fd-util.h"
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#include "fileio.h"
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#include "format-util.h"
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#include "log.h"
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#include "macro.h"
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#include "string-util.h"
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#include "strv.h"
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#include "user-util.h"
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static bool match_uid_gid(uid_t subject_uid, gid_t subject_gid, uid_t delete_uid, gid_t delete_gid) {
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if (uid_is_valid(delete_uid) && subject_uid == delete_uid)
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return true;
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if (gid_is_valid(delete_gid) && subject_gid == delete_gid)
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return true;
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return false;
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}
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static int clean_sysvipc_shm(uid_t delete_uid, gid_t delete_gid, bool rm) {
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_cleanup_fclose_ FILE *f = NULL;
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bool first = true;
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int ret = 0, r;
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f = fopen("/proc/sysvipc/shm", "re");
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if (!f) {
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if (errno == ENOENT)
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return 0;
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return log_warning_errno(errno, "Failed to open /proc/sysvipc/shm: %m");
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}
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for (;;) {
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_cleanup_free_ char *line = NULL;
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unsigned n_attached;
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pid_t cpid, lpid;
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uid_t uid, cuid;
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gid_t gid, cgid;
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int shmid;
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r = read_line(f, LONG_LINE_MAX, &line);
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if (r < 0)
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return log_warning_errno(errno, "Failed to read /proc/sysvipc/shm: %m");
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if (r == 0)
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break;
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if (first) {
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first = false;
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continue;
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}
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if (sscanf(line, "%*i %i %*o %*u " PID_FMT " " PID_FMT " %u " UID_FMT " " GID_FMT " " UID_FMT " " GID_FMT,
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&shmid, &cpid, &lpid, &n_attached, &uid, &gid, &cuid, &cgid) != 8)
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continue;
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if (n_attached > 0)
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continue;
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if (!match_uid_gid(uid, gid, delete_uid, delete_gid))
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continue;
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if (!rm)
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return 1;
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if (shmctl(shmid, IPC_RMID, NULL) < 0) {
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/* Ignore entries that are already deleted */
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if (IN_SET(errno, EIDRM, EINVAL))
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continue;
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ret = log_warning_errno(errno,
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"Failed to remove SysV shared memory segment %i: %m",
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shmid);
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} else {
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log_debug("Removed SysV shared memory segment %i.", shmid);
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if (ret == 0)
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ret = 1;
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}
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}
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return ret;
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}
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static int clean_sysvipc_sem(uid_t delete_uid, gid_t delete_gid, bool rm) {
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_cleanup_fclose_ FILE *f = NULL;
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bool first = true;
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int ret = 0, r;
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f = fopen("/proc/sysvipc/sem", "re");
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if (!f) {
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if (errno == ENOENT)
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return 0;
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return log_warning_errno(errno, "Failed to open /proc/sysvipc/sem: %m");
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}
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for (;;) {
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_cleanup_free_ char *line = NULL;
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uid_t uid, cuid;
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gid_t gid, cgid;
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int semid;
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r = read_line(f, LONG_LINE_MAX, &line);
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if (r < 0)
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return log_warning_errno(r, "Failed to read /proc/sysvipc/sem: %m");
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if (r == 0)
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break;
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if (first) {
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first = false;
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continue;
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}
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if (sscanf(line, "%*i %i %*o %*u " UID_FMT " " GID_FMT " " UID_FMT " " GID_FMT,
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&semid, &uid, &gid, &cuid, &cgid) != 5)
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continue;
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if (!match_uid_gid(uid, gid, delete_uid, delete_gid))
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continue;
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if (!rm)
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return 1;
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if (semctl(semid, 0, IPC_RMID) < 0) {
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/* Ignore entries that are already deleted */
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if (IN_SET(errno, EIDRM, EINVAL))
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continue;
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ret = log_warning_errno(errno,
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"Failed to remove SysV semaphores object %i: %m",
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semid);
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} else {
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log_debug("Removed SysV semaphore %i.", semid);
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if (ret == 0)
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ret = 1;
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}
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}
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return ret;
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}
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static int clean_sysvipc_msg(uid_t delete_uid, gid_t delete_gid, bool rm) {
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_cleanup_fclose_ FILE *f = NULL;
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bool first = true;
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int ret = 0, r;
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f = fopen("/proc/sysvipc/msg", "re");
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if (!f) {
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if (errno == ENOENT)
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return 0;
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return log_warning_errno(errno, "Failed to open /proc/sysvipc/msg: %m");
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}
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for (;;) {
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_cleanup_free_ char *line = NULL;
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uid_t uid, cuid;
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gid_t gid, cgid;
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pid_t cpid, lpid;
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int msgid;
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r = read_line(f, LONG_LINE_MAX, &line);
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if (r < 0)
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return log_warning_errno(r, "Failed to read /proc/sysvipc/msg: %m");
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if (r == 0)
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break;
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if (first) {
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first = false;
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continue;
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}
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if (sscanf(line, "%*i %i %*o %*u %*u " PID_FMT " " PID_FMT " " UID_FMT " " GID_FMT " " UID_FMT " " GID_FMT,
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&msgid, &cpid, &lpid, &uid, &gid, &cuid, &cgid) != 7)
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continue;
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if (!match_uid_gid(uid, gid, delete_uid, delete_gid))
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continue;
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if (!rm)
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return 1;
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if (msgctl(msgid, IPC_RMID, NULL) < 0) {
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/* Ignore entries that are already deleted */
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if (IN_SET(errno, EIDRM, EINVAL))
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continue;
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ret = log_warning_errno(errno,
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"Failed to remove SysV message queue %i: %m",
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msgid);
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} else {
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log_debug("Removed SysV message queue %i.", msgid);
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if (ret == 0)
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ret = 1;
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}
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}
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return ret;
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}
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static int clean_posix_shm_internal(const char *dirname, DIR *dir, uid_t uid, gid_t gid, bool rm) {
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struct dirent *de;
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int ret = 0, r;
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assert(dir);
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FOREACH_DIRENT_ALL(de, dir, goto fail) {
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struct stat st;
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if (dot_or_dot_dot(de->d_name))
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continue;
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if (fstatat(dirfd(dir), de->d_name, &st, AT_SYMLINK_NOFOLLOW) < 0) {
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if (errno == ENOENT)
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continue;
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ret = log_warning_errno(errno, "Failed to stat() POSIX shared memory segment %s/%s: %m",
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dirname, de->d_name);
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continue;
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}
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if (S_ISDIR(st.st_mode)) {
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_cleanup_closedir_ DIR *kid;
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kid = xopendirat(dirfd(dir), de->d_name, O_NOFOLLOW|O_NOATIME);
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if (!kid) {
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if (errno != ENOENT)
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ret = log_warning_errno(errno, "Failed to enter shared memory directory %s/%s: %m",
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dirname, de->d_name);
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} else {
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r = clean_posix_shm_internal(de->d_name, kid, uid, gid, rm);
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if (r < 0)
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ret = r;
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}
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if (!match_uid_gid(st.st_uid, st.st_gid, uid, gid))
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continue;
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if (!rm)
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return 1;
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if (unlinkat(dirfd(dir), de->d_name, AT_REMOVEDIR) < 0) {
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if (errno == ENOENT)
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continue;
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ret = log_warning_errno(errno, "Failed to remove POSIX shared memory directory %s/%s: %m",
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dirname, de->d_name);
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} else {
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log_debug("Removed POSIX shared memory directory %s", de->d_name);
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if (ret == 0)
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ret = 1;
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}
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} else {
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if (!match_uid_gid(st.st_uid, st.st_gid, uid, gid))
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continue;
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if (!rm)
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return 1;
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if (unlinkat(dirfd(dir), de->d_name, 0) < 0) {
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if (errno == ENOENT)
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continue;
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ret = log_warning_errno(errno, "Failed to remove POSIX shared memory segment %s: %m", de->d_name);
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} else {
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log_debug("Removed POSIX shared memory segment %s", de->d_name);
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if (ret == 0)
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ret = 1;
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}
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}
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}
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return ret;
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fail:
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return log_warning_errno(errno, "Failed to read /dev/shm: %m");
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}
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static int clean_posix_shm(uid_t uid, gid_t gid, bool rm) {
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_cleanup_closedir_ DIR *dir = NULL;
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dir = opendir("/dev/shm");
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if (!dir) {
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if (errno == ENOENT)
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return 0;
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return log_warning_errno(errno, "Failed to open /dev/shm: %m");
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}
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return clean_posix_shm_internal("/dev/shm", dir, uid, gid, rm);
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}
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static int clean_posix_mq(uid_t uid, gid_t gid, bool rm) {
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_cleanup_closedir_ DIR *dir = NULL;
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struct dirent *de;
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int ret = 0;
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dir = opendir("/dev/mqueue");
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if (!dir) {
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if (errno == ENOENT)
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return 0;
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return log_warning_errno(errno, "Failed to open /dev/mqueue: %m");
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}
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FOREACH_DIRENT_ALL(de, dir, goto fail) {
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struct stat st;
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char fn[1+strlen(de->d_name)+1];
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if (dot_or_dot_dot(de->d_name))
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continue;
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if (fstatat(dirfd(dir), de->d_name, &st, AT_SYMLINK_NOFOLLOW) < 0) {
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if (errno == ENOENT)
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continue;
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ret = log_warning_errno(errno,
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"Failed to stat() MQ segment %s: %m",
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de->d_name);
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continue;
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}
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if (!match_uid_gid(st.st_uid, st.st_gid, uid, gid))
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continue;
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if (!rm)
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return 1;
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fn[0] = '/';
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strcpy(fn+1, de->d_name);
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if (mq_unlink(fn) < 0) {
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if (errno == ENOENT)
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continue;
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ret = log_warning_errno(errno,
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"Failed to unlink POSIX message queue %s: %m",
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fn);
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} else {
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log_debug("Removed POSIX message queue %s", fn);
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if (ret == 0)
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ret = 1;
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}
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}
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return ret;
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fail:
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return log_warning_errno(errno, "Failed to read /dev/mqueue: %m");
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}
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int clean_ipc_internal(uid_t uid, gid_t gid, bool rm) {
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int ret = 0, r;
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/* If 'rm' is true, clean all IPC objects owned by either the specified UID or the specified GID. Return the
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* last error encountered or == 0 if no matching IPC objects have been found or > 0 if matching IPC objects
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* have been found and have been removed.
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*
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* If 'rm' is false, just search for IPC objects owned by either the specified UID or the specified GID. In
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* this case we return < 0 on error, > 0 if we found a matching object, == 0 if we didn't.
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*
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* As special rule: if UID/GID is specified as root we'll silently not clean up things, and always claim that
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* there are IPC objects for it. */
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if (uid == 0) {
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if (!rm)
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return 1;
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uid = UID_INVALID;
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}
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if (gid == 0) {
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if (!rm)
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return 1;
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gid = GID_INVALID;
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}
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/* Anything to do? */
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if (!uid_is_valid(uid) && !gid_is_valid(gid))
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return 0;
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r = clean_sysvipc_shm(uid, gid, rm);
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if (r != 0) {
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if (!rm)
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return r;
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if (ret == 0)
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ret = r;
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}
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r = clean_sysvipc_sem(uid, gid, rm);
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if (r != 0) {
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if (!rm)
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return r;
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if (ret == 0)
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ret = r;
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}
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r = clean_sysvipc_msg(uid, gid, rm);
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if (r != 0) {
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if (!rm)
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return r;
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if (ret == 0)
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ret = r;
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}
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r = clean_posix_shm(uid, gid, rm);
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if (r != 0) {
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if (!rm)
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return r;
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if (ret == 0)
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ret = r;
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}
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r = clean_posix_mq(uid, gid, rm);
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if (r != 0) {
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if (!rm)
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return r;
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if (ret == 0)
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ret = r;
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}
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return ret;
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}
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int clean_ipc_by_uid(uid_t uid) {
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return clean_ipc_internal(uid, GID_INVALID, true);
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}
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int clean_ipc_by_gid(gid_t gid) {
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return clean_ipc_internal(UID_INVALID, gid, true);
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}
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