On Wed, Oct 20, 2021 at 12:43:59PM -0500, Eric W. Biederman wrote:

Add a simple helper force_fatal_sig that causes a signal to be
delivered to a process as if the signal handler was set to SIG_DFL.

Reimplement force_sigsegv based upon this new helper.  This fixes
force_sigsegv so that when it forces the default signal handler
to be used the code now forces the signal to be unblocked as well.

Reusing the tested logic in force_sig_info_to_task that was built for
force_sig_seccomp this makes the implementation trivial.

This is interesting both because it makes force_sigsegv simpler and
because there are a couple of buggy places in the kernel that call
do_exit(SIGILL) or do_exit(SIGSYS) because there is no straight
forward way today for those places to simply force the exit of a
process with the chosen signal.  Creating force_fatal_sig allows
those places to be implemented with normal signal exits.

I assume this is talking about seccomp()? :) Should a patch be included
in this series to change those?

Signed-off-by: "Eric W. Biederman" <redacted>

Reviewed-by: Kees Cook <redacted>

-- 
Kees Cook