diff options
Diffstat (limited to 'src/basic')
| -rw-r--r-- | src/basic/capability-util.c | 5 | ||||
| -rw-r--r-- | src/basic/user-util.c | 49 |
2 files changed, 31 insertions, 23 deletions
diff --git a/src/basic/capability-util.c b/src/basic/capability-util.c index 383f1137e..4a78b14d8 100644 --- a/src/basic/capability-util.c +++ b/src/basic/capability-util.c @@ -298,8 +298,9 @@ int drop_privileges(uid_t uid, gid_t gid, uint64_t keep_capabilities) { if (setresgid(gid, gid, gid) < 0) return log_error_errno(errno, "Failed to change group ID: %m"); - if (maybe_setgroups(0, NULL) < 0) - return log_error_errno(errno, "Failed to drop auxiliary groups list: %m"); + r = maybe_setgroups(0, NULL); + if (r < 0) + return log_error_errno(r, "Failed to drop auxiliary groups list: %m"); /* Ensure we keep the permitted caps across the setresuid() */ if (prctl(PR_SET_KEEPCAPS, 1) < 0) diff --git a/src/basic/user-util.c b/src/basic/user-util.c index 299ac32ee..893790f78 100644 --- a/src/basic/user-util.c +++ b/src/basic/user-util.c @@ -463,9 +463,11 @@ int get_shell(char **_s) { #endif // 0 int reset_uid_gid(void) { + int r; - if (maybe_setgroups(0, NULL) < 0) - return -errno; + r = maybe_setgroups(0, NULL); + if (r < 0) + return r; if (setresgid(0, 0, 0) < 0) return -errno; @@ -610,25 +612,30 @@ bool valid_home(const char *p) { } int maybe_setgroups(size_t size, const gid_t *list) { - static int cached_can_setgroups = -1; - /* check if setgroups is allowed before we try to drop all the auxiliary groups */ - if (size == 0) { - if (cached_can_setgroups < 0) { - _cleanup_free_ char *setgroups_content = NULL; - int r = read_one_line_file("/proc/self/setgroups", &setgroups_content); - if (r < 0 && errno != ENOENT) - return r; - if (r < 0) { - /* old kernels don't have /proc/self/setgroups, so assume we can use setgroups */ - cached_can_setgroups = true; - } else { - cached_can_setgroups = streq(setgroups_content, "allow"); - if (!cached_can_setgroups) - log_debug("skip setgroups, /proc/self/setgroups is set to 'deny'"); - } - } - if (!cached_can_setgroups) + int r; + + /* Check if setgroups is allowed before we try to drop all the auxiliary groups */ + if (size == 0) { /* Dropping all aux groups? */ + _cleanup_free_ char *setgroups_content = NULL; + bool can_setgroups; + + r = read_one_line_file("/proc/self/setgroups", &setgroups_content); + if (r == -ENOENT) + /* Old kernels don't have /proc/self/setgroups, so assume we can use setgroups */ + can_setgroups = true; + else if (r < 0) + return r; + else + can_setgroups = streq(setgroups_content, "allow"); + + if (!can_setgroups) { + log_debug("Skipping setgroups(), /proc/self/setgroups is set to 'deny'"); return 0; + } } - return setgroups(size, list); + + if (setgroups(size, list) < 0) + return -errno; + + return 0; } |