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Date: Wed, 03 Nov 2021 13:35:56 -0500 From: ebiederm@...ssion.com (Eric W. Biederman) To: Kees Cook <keescook@...omium.org> Cc: Andrea Righi <andrea.righi@...onical.com>, Shuah Khan <shuah@...nel.org>, Alexei Starovoitov <ast@...nel.org>, Andy Lutomirski <luto@...capital.net>, Will Drewry <wad@...omium.org>, linux-kselftest@...r.kernel.org, bpf@...r.kernel.org, linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org Subject: Re: selftests: seccomp_bpf failure on 5.15 Kees Cook <keescook@...omium.org> writes: > On Tue, Nov 02, 2021 at 01:22:19PM -0500, Eric W. Biederman wrote: >> Kees Cook <keescook@...omium.org> writes: >> >> > On Thu, Oct 28, 2021 at 05:06:53PM -0500, Eric W. Biederman wrote: >> >> Kees Cook <keescook@...omium.org> writes: >> >> >> >> > On Thu, Oct 28, 2021 at 12:26:26PM -0500, Eric W. Biederman wrote: >> >> >> >> Is it a problem that the debugger can see the signal if the process does >> >> not? >> > >> > Right, I'm trying to understand that too. However, my neighbor just lost >> > power. :| >> > >> > What I was in the middle of checking was what ptrace "sees" going >> > through a fatal SIGSYS; my initial debugging attempts were weird. >> >> Kees have you regained power and had a chance to see my SA_IMMUTABLE >> patch? > > Apologies; I got busy with other stuff, but I've tested this now. It's > happy and I see the expected behaviors again. Note that I used the patch > with this change: > > -#define SA_IMMUTABLE 0x008000000 > +#define SA_IMMUTABLE 0x00800000 > > Tested-by: Kees Cook <keescook@...omium.org> Thanks. And I see you have written a test as well that should keep this kind of bug from happening again. Eric
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