diff options
Diffstat (limited to 'src/shared/seccomp-util.c')
| -rw-r--r-- | src/shared/seccomp-util.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/src/shared/seccomp-util.c b/src/shared/seccomp-util.c index 50ad6bc244..49044a45ae 100644 --- a/src/shared/seccomp-util.c +++ b/src/shared/seccomp-util.c @@ -1230,6 +1230,21 @@ int seccomp_restrict_namespaces(unsigned long retain) { if (r < 0) return r; + /* We cannot filter on individual flags to clone3(), and we need to disable the + * syscall altogether. ENOSYS is used instead of EPERM, so that glibc and other + * users shall fall back to clone(), as if on an older kernel. + * + * C.f. https://github.com/flatpak/flatpak/commit/a10f52a7565c549612c92b8e736a6698a53db330, + * https://github.com/moby/moby/issues/42680. */ + + r = seccomp_rule_add_exact( + seccomp, + SCMP_ACT_ERRNO(ENOSYS), + SCMP_SYS(clone3), + 0); + if (r < 0) + log_debug_errno(r, "Failed to add clone3() rule for architecture %s, ignoring: %m", seccomp_arch_to_string(arch)); + if ((retain & NAMESPACE_FLAGS_ALL) == 0) /* If every single kind of namespace shall be prohibited, then let's block the whole setns() syscall * altogether. */ |