Re: [PATCH 0/3] signal: HANDLER_EXIT should clear SIGNAL_UNKILLABLE

[Eric W. Biederman]

Kees Cook <keescook@xxxxxxxxxxxx> writes:

> Hi,
>
> This fixes the signal refactoring to actually kill unkillable processes
> when receiving a fatal SIGSYS from seccomp. Thanks to Robert for the
> report and Eric for the fix! I've also tweaked seccomp internal a bit to
> fail more safely. This was a partial seccomp bypass, in the sense that
> SECCOMP_RET_KILL_* didn't kill the process, but it didn't bypass other
> aspects of the filters. (i.e. the syscall was still blocked, etc.)

Any luck on figuring out how to suppress the extra event?
>
> I'll be sending this to Linus after a bit more testing...
>
> Thanks,
>
> -Kees
>
> Kees Cook (3):
>   signal: HANDLER_EXIT should clear SIGNAL_UNKILLABLE
>   seccomp: Invalidate seccomp mode to catch death failures
>   samples/seccomp: Adjust sample to also provide kill option
>
>  kernel/seccomp.c          | 10 ++++++++++
>  kernel/signal.c           |  5 +++--
>  samples/seccomp/dropper.c |  9 +++++++--
>  3 files changed, 20 insertions(+), 4 deletions(-)

Eric