[PATCH 07/20] signal/powerpc: On swapcontext failure force SIGSEGV

[Kees Cook]

On Wed, Oct 20, 2021 at 12:43:53PM -0500, Eric W. Biederman wrote:
> If the register state may be partial and corrupted instead of calling
> do_exit, call force_sigsegv(SIGSEGV).  Which properly kills the
> process with SIGSEGV and does not let any more userspace code execute,
> instead of just killing one thread of the process and potentially
> confusing everything.
> 
> Cc: Michael Ellerman <mpe at ellerman.id.au>
> Cc: Benjamin Herrenschmidt <benh at kernel.crashing.org>
> Cc: Paul Mackerras <paulus at samba.org>
> Cc: linuxppc-dev at lists.ozlabs.org
> History-tree: git://git.kernel.org/pub/scm/linux/kernel/git/tglx/history.git
> Fixes: 756f1ae8a44e ("PPC32: Rework signal code and add a swapcontext system call.")
> Fixes: 04879b04bf50 ("[PATCH] ppc64: VMX (Altivec) support & signal32 rework, from Ben Herrenschmidt")
> Signed-off-by: "Eric W. Biederman" <ebiederm at xmission.com>

This looks right to me.

Reviewed-by: Kees Cook <keescook at chromium.org>

-- 
Kees Cook