control: found -1 2.36-9+deb12u8
Hi,
On 2024-10-01 13:25, Jingyuan Liang wrote:
> Package: libc6
> Version: 2.38-7+gl0
> Severity: normal
> X-Debbugs-Cc: jingyuanli...@google.com
>
> Dear Maintainer,
>
> The issue happened in a containerized context - the system information
> extracted below doesn't apply.
>
> If you speak Docker, the build below is a reproduction of the issue;
> otherwise, just skip this.
>
> ```
> FROM debian:bookworm-slim AS bash
>
> RUN apt-get update && apt-get install -y --no-install-recommends
> --no-install-suggests bash-static
>
> FROM
> gcr.io/distroless/base-debian12@sha256:6ae5fe659f28c6afe9cc2903aebc78a5c6ad3aaa3d9d0369760ac6aaea2529c8
>
> COPY --from=bash /bin/bash-static /bin/bash
>
> ENTRYPOINT ["/bin/bash"]
> ```
Thanks for reporting this and for the docker reproducer. This can be
reproduced in a simpler way by:
- using "compat" in /etc/nsswitch.conf for the passwd database.
- executing bash-static or this simple program compiled statically:
| #include <pwd.h>
| #include <sys/types.h>
| #include <unistd.h>
|
| int main()
| {
| return getpwuid(getuid()) != NULL;
| }
The issue has been introduced by the following upstream commit:
| commit 24de733967029fd902c34073d2ab25b900887352
| Author: Wilco Dijkstra <wilco.dijks...@arm.com>
| Date: Thu Mar 21 16:48:33 2024 +0000
|
| AArch64: Check kernel version for SVE ifuncs
|
| Old Linux kernels disable SVE after every system call. Calling the
| SVE-optimized memcpy afterwards will then cause a trap to reenable SVE.
| As a result, applications with a high use of syscalls may run slower with
| the SVE memcpy. This is true for kernels between 4.15.0 and before 6.2.0,
| except for 5.14.0 which was patched. Avoid this by checking the kernel
| version and selecting the SVE ifunc on modern kernels.
|
| Parse the kernel version reported by uname() into a 24-bit
kernel.major.minor
| value without calling any library functions. If uname() is not supported
or
| if the version format is not recognized, assume the kernel is modern.
|
| Tested-by: Florian Weimer <fwei...@redhat.com>
| Reviewed-by: Szabolcs Nagy <szabolcs.n...@arm.com>
| (cherry picked from commit 2e94e2f5d2bf2de124c8ad7da85463355e54ccb2)
A workaround is to use "compat" in /etc/nsswitch.conf if your setup
allows that ("files" being the default). Another one is to rebuild
bash-static against libc6 2.36-9+deb12u8.
I have brought up the issue upstream:
https://sourceware.org/pipermail/libc-alpha/2024-October/160401.html
Regards
Aurelien
--
Aurelien Jarno GPG: 4096R/1DDD8C9B
aurel...@aurel32.net http://aurel32.net
