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nspawn: be more careful with creating/chowning directories to overmount

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We should never re-chown selinuxfs.

Fixes: #15475
This commit is contained in:
Lennart Poettering 2020-04-22 16:35:32 +02:00 committed by Zbigniew Jędrzejewski-Szmek
parent c98fef264b
commit dcff2fa5d1
2 changed files with 22 additions and 19 deletions
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40
src/nspawn/nspawn-mount.c
View File

@ -569,7 +569,7 @@ int mount_all(const char *dest,
static const MountPoint mount_table[] = {
/* First we list inner child mounts (i.e. mounts applied *after* entering user namespacing) */
{ "proc", "/proc", "proc", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV,
MOUNT_FATAL|MOUNT_IN_USERNS },
MOUNT_FATAL|MOUNT_IN_USERNS|MOUNT_MKDIR },
{ "/proc/sys", "/proc/sys", NULL, NULL, MS_BIND,
MOUNT_FATAL|MOUNT_IN_USERNS|MOUNT_APPLY_APIVFS_RO }, /* Bind mount first ... */
@ -599,23 +599,23 @@ int mount_all(const char *dest,
PROC_READ_ONLY("/proc/scsi"),
{ "mqueue", "/dev/mqueue", "mqueue", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV,
MOUNT_IN_USERNS },
MOUNT_IN_USERNS|MOUNT_MKDIR },
/* Then we list outer child mounts (i.e. mounts applied *before* entering user namespacing) */
{ "tmpfs", "/tmp", "tmpfs", "mode=1777", MS_NOSUID|MS_NODEV|MS_STRICTATIME,
MOUNT_FATAL|MOUNT_APPLY_TMPFS_TMP },
MOUNT_FATAL|MOUNT_APPLY_TMPFS_TMP|MOUNT_MKDIR },
{ "tmpfs", "/sys", "tmpfs", "mode=555", MS_NOSUID|MS_NOEXEC|MS_NODEV,
MOUNT_FATAL|MOUNT_APPLY_APIVFS_NETNS },
MOUNT_FATAL|MOUNT_APPLY_APIVFS_NETNS|MOUNT_MKDIR },
{ "sysfs", "/sys", "sysfs", NULL, MS_RDONLY|MS_NOSUID|MS_NOEXEC|MS_NODEV,
MOUNT_FATAL|MOUNT_APPLY_APIVFS_RO }, /* skipped if above was mounted */
MOUNT_FATAL|MOUNT_APPLY_APIVFS_RO|MOUNT_MKDIR }, /* skipped if above was mounted */
{ "sysfs", "/sys", "sysfs", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV,
MOUNT_FATAL }, /* skipped if above was mounted */
MOUNT_FATAL|MOUNT_MKDIR }, /* skipped if above was mounted */
{ "tmpfs", "/dev", "tmpfs", "mode=755", MS_NOSUID|MS_STRICTATIME,
MOUNT_FATAL },
MOUNT_FATAL|MOUNT_MKDIR },
{ "tmpfs", "/dev/shm", "tmpfs", "mode=1777", MS_NOSUID|MS_NODEV|MS_STRICTATIME,
MOUNT_FATAL },
MOUNT_FATAL|MOUNT_MKDIR },
{ "tmpfs", "/run", "tmpfs", "mode=755", MS_NOSUID|MS_NODEV|MS_STRICTATIME,
MOUNT_FATAL },
MOUNT_FATAL|MOUNT_MKDIR },
#if HAVE_SELINUX
{ "/sys/fs/selinux", "/sys/fs/selinux", NULL, NULL, MS_BIND,
@ -663,17 +663,19 @@ int mount_all(const char *dest,
continue;
}
r = mkdir_userns_p(dest, where, 0755, (use_userns && !in_userns) ? uid_shift : UID_INVALID);
if (r < 0 && r != -EEXIST) {
if (fatal && r != -EROFS)
return log_error_errno(r, "Failed to create directory %s: %m", where);
if (FLAGS_SET(mount_table[k].mount_settings, MOUNT_MKDIR)) {
r = mkdir_userns_p(dest, where, 0755, (use_userns && !in_userns) ? uid_shift : UID_INVALID);
if (r < 0 && r != -EEXIST) {
if (fatal && r != -EROFS)
return log_error_errno(r, "Failed to create directory %s: %m", where);
log_debug_errno(r, "Failed to create directory %s: %m", where);
/* If we failed mkdir() or chown() due to the root
* directory being read only, attempt to mount this fs
* anyway and let mount_verbose log any errors */
if (r != -EROFS)
continue;
log_debug_errno(r, "Failed to create directory %s: %m", where);
/* If we failed mkdir() or chown() due to the root directory being read only,
* attempt to mount this fs anyway and let mount_verbose log any errors */
if (r != -EROFS)
continue;
}
}
o = mount_table[k].options;

1
src/nspawn/nspawn-mount.h
View File

@ -16,6 +16,7 @@ typedef enum MountSettingsMask {
MOUNT_APPLY_TMPFS_TMP = 1 << 5, /* if set, /tmp will be mounted as tmpfs */
MOUNT_ROOT_ONLY = 1 << 6, /* if set, only root mounts are mounted */
MOUNT_NON_ROOT_ONLY = 1 << 7, /* if set, only non-root mounts are mounted */
MOUNT_MKDIR = 1 << 8, /* if set, make directory to mount over first */
} MountSettingsMask;
typedef enum CustomMountType {