Alexander Bokovoy
1bf0d62828
Linux 5.8 made faccessat2() system call available in August 2020. This system call is used now by GNU libc to implement more precisely faccessat() system call. GNU glibc does compile-time check for the kernel version and uses faccessat2() unconditionally in case it is available. If kernel responds with ENOSYS error code, GNU libc will attempt to use older, less flexible, faccessat(() system call. When running on a system where libseccomp does not know about the new syscall, the default action in seccomp filters in Docker and other container runtimes is to respond with EPERM error code. This breaks GNU libc's implementation of the faccessat() function -- as well as other newer syscall implementations (e.g. statx()). libseccomp started to support faccessat2() in July 2020 with https://github.com/seccomp/libseccomp/commit/5696c896409c1feb37eb502df33cf36efb2e8e01 (version 2.5.0: https://github.com/seccomp/libseccomp/releases/tag/v2.5.0) With Ubuntu 20.04 as a host, use PPA abbra/freeipa-libseccomp which provides libseccomp 2.5.0 rebuild from Debian Sid. Signed-off-by: Alexander Bokovoy <abokovoy@redhat.com> Reviewed-By: Rob Crittenden <rcritten@redhat.com>