ACK: [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(-)
> 
Acked-by: Stefan Bader <stefan.bader at canonical.com>

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