From eb14b993bb426b67553babb48de75bec30063a4c Mon Sep 17 00:00:00 2001 From: Yu Watanabe Date: Sat, 23 Nov 2024 06:08:48 +0900 Subject: [PATCH] namespace-util: handle -ENOSPC by userns_acquire() gracefully in is_idmapping_supported() Follow-up for edae62120f13b24d51812d1d7c0ab24acb420305. Fixes #35311. --- src/basic/namespace-util.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/src/basic/namespace-util.c b/src/basic/namespace-util.c index 2c61506149f..1d566f59e88 100644 --- a/src/basic/namespace-util.c +++ b/src/basic/namespace-util.c @@ -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); -- 2.47.3