Public bug reported: `chmod -R` changes entries below its command-line argument with a raw `syscall(SYS_fchmodat2, ...)` instead of a libc call, so `LD_PRELOAD` tools (fakeroot, fakechroot, pseudo) never see it. The mode changes on disk, but their bookkeeping does not, so later `stat()` calls report the old mode. Exit status is 0 and stderr is empty, so the loss is silent
This can be reproduced by running the following commands using uutils 0.10.0, fakeroot 1.37.1.2, Linux 6.16: ```sh mkdir -p d/sub fakeroot sh -c 'chown -R daemon:daemon d && chmod -R u+s d && find d -printf "%M %p\n" | sort' ``` GNU coreutils: ```sh drwsrwxr-x d drwsrwxr-x d/sub ``` uutils: ```sh drwsrwxr-x d drwxrwxr-x d/sub # setuid bit lost ``` This is an upstream bug introduced in the following commit: https://github.com/uutils/coreutils/commit/fe9420b8f07b1e6fee7462663221392f985d356e ** Affects: rust-coreutils Importance: Unknown Status: Unknown ** Affects: rust-coreutils (Ubuntu) Importance: Undecided Status: New ** Bug watch added: github.com/uutils/coreutils/issues #14028 https://github.com/uutils/coreutils/issues/14028 ** Also affects: rust-coreutils via https://github.com/uutils/coreutils/issues/14028 Importance: Unknown Status: Unknown -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2164536 Title: chmod -R: raw fchmodat2 syscall bypasses libc, breaking LD_PRELOAD tools To manage notifications about this bug go to: https://bugs.launchpad.net/rust-coreutils/+bug/2164536/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
