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Date: Thu, 23 Feb 2012 14:33:02 -0800
From: Markus Gutschke <markus@...omium.org>
To: Indan Zupancic <indan@....nu>
Cc: Will Drewry <wad@...omium.org>, Roland McGrath <mcgrathr@...gle.com>,
"H. Peter Anvin" <hpa@...or.com>, Kees Cook <keescook@...omium.org>, Andrew Lutomirski <luto@....edu>,
linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
linux-doc@...r.kernel.org, kernel-hardening@...ts.openwall.com,
netdev@...r.kernel.org, x86@...nel.org, arnd@...db.de, davem@...emloft.net,
mingo@...hat.com, oleg@...hat.com, peterz@...radead.org, rdunlap@...otime.net,
tglx@...utronix.de, eparis@...hat.com, serge.hallyn@...onical.com,
djm@...drot.org, scarybeasts@...il.com, pmoore@...hat.com,
akpm@...ux-foundation.org, corbet@....net, eric.dumazet@...il.com
Subject: Re: [PATCH v10 07/11] signal, x86: add SIGSYS info and make it synchronous.
On Thu, Feb 23, 2012 at 14:15, Indan Zupancic <indan@....nu> wrote:
> What about making SECCOMP_RET_TRAP dump core/send SIGSYS if there is
> no tracer with PTRACE_O_SECCOMP set?
Please don't make things dependent on having a tracer. There are
applications that don't really need a tracer; in fact, these are
typically the exact same applications that can benefit from receiving
SIGSYS and then handling it internally.
If a tracer was required to set this up, it would make it difficult to
use gdb, strace, or any other common debugging tools.
> Sending SIGSYS is useful, but it's quite a bit less useful if user
> space can't handle it in a signal handler, so I don't think it's
> worth it to make a unblockable version.
Maybe, I am not parsing your e-mail correctly. But don't we already
get the desired behavior, if SIGSYS is treated the same as any other
synchronous signal? If it is unblocked and has a handler, the
application can decide to handle it. If neither one of these
conditions is true, it terminates the program. Ulimits and
PR_SET_DUMPABLE determine whether a core file is generated.
Markus
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