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namespace-util: handle -ENOSPC by userns_acquire() gracefully in is_idmapping_supported()

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Follow-up for edae62120f.
Fixes #35311.
This commit is contained in:
Yu Watanabe
2024-11-23 06:08:48 +09:00
parent c946b13575
commit eb14b993bb
1 changed files with 4 additions and 0 deletions
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4
src/basic/namespace-util.c
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@@ -531,6 +531,10 @@ int is_idmapping_supported(const char *path) {
userns_fd = userns_acquire(uid_map, gid_map);
if (ERRNO_IS_NEG_NOT_SUPPORTED(userns_fd) || ERRNO_IS_NEG_PRIVILEGE(userns_fd))
return false;
if (userns_fd == -ENOSPC) {
log_debug_errno(userns_fd, "Failed to acquire new user namespace, user.max_user_namespaces seems to be exhausted or maybe even zero, assuming ID-mapping is not supported: %m");
return false;
}
if (userns_fd < 0)
return log_debug_errno(userns_fd, "ID-mapping supported namespace acquire failed for '%s' : %m", path);