[SRU Bionic][PATCH 0/2] Fix invalid syscall return for traced tasks

[Stefan Bader]

On 21.04.21 20:40, Dan Streetman wrote:
> BugLink: https://bugs.launchpad.net/bugs/1895132
> 
> For any traced task, that has _TIF_TRACED set, invalid syscalls are
> sent to the tracing code, which returns EPERM instead of ENOSYS, and
> breaks userspace.
> 
> Note that in focal (5.4) the return value was the actual syscall number,
> while in bionic the return value is EPERM. However either value breaks
> userspace.
> 
> This is causing narrow failures of hirsute containers on bionic hosts
> that are running the 4.15 kernel, as detailed in bug 1916485.
> 
> Sven Schnelle (2):
>    s390/ptrace: return -ENOSYS when invalid syscall is supplied
>    s390/ptrace: pass invalid syscall numbers to tracing
> 
>   arch/s390/kernel/entry.S  |  2 +-
>   arch/s390/kernel/ptrace.c | 23 ++++++++++++++---------
>   2 files changed, 15 insertions(+), 10 deletions(-)
> 

Cover email should contain the target series (:<kernel>) for simpler reviews. 
The bug task should have status and importance set (I did that). And just 
wnodering, have you not been subscribed to the kermel-team mailing list before? 
Just baecause now all your posts need moderation.

-Stefan

-------------- next part --------------
A non-text attachment was scrubbed...
Name: OpenPGP_signature
Type: application/pgp-signature
Size: 833 bytes
Desc: OpenPGP digital signature
URL: <https://lists.ubuntu.com/archives/kernel-team/attachments/20210422/9561a4e9/attachment-0001.sig>