From: "Indan Zupancic" <indan@nul.nu>
To: "Will Drewry" <wad@chromium.org>
Cc: "Roland McGrath" <mcgrathr@google.com>,
"H. Peter Anvin" <hpa@zytor.com>,
"Kees Cook" <keescook@chromium.org>,
"Andrew Lutomirski" <luto@mit.edu>,
linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org,
linux-doc@vger.kernel.org, kernel-hardening@lists.openwall.com,
netdev@vger.kernel.org, x86@kernel.org, arnd@arndb.de,
davem@davemloft.net, mingo@redhat.com, oleg@redhat.com,
peterz@infradead.org, rdunlap@xenotime.net, tglx@linutronix.de,
eparis@redhat.com, serge.hallyn@canonical.com, djm@mindrot.org,
scarybeasts@gmail.com, pmoore@redhat.com,
akpm@linux-foundation.org, corbet@lwn.net,
eric.dumazet@gmail.com, markus@chromium.org
Subject: Re: [PATCH v10 07/11] signal, x86: add SIGSYS info and make it synchronous.
Date: Thu, 23 Feb 2012 23:15:51 +0100 [thread overview]
Message-ID: <fe2d4b97d84c1e8053c397a20eec7ac8.squirrel@webmail.greenhost.nl> (raw)
In-Reply-To: <CABqD9hbsZTtkFzM_8rHqAWjZhiV0iWb6s1eMF9LriH-NybrorA@mail.gmail.com>
On Thu, February 23, 2012 20:26, Will Drewry wrote:
> Seems like there's an argument for another return code,
> SECCOMP_RET_CORE, that resets/unblocks the SIGSYS handler since the
> existing TRAP and KILL options seem to cover the other paths (signal
> handler and do_exit).
What about making SECCOMP_RET_TRAP dump core/send SIGSYS if there is
no tracer with PTRACE_O_SECCOMP set? And perhaps go for a blockable
SIGSYS? That way you only have KILL, ERRNO and TRAP, with the last
one meaning deny, but giving someone else a chance to do something.
Or is that just confusing?
I don't think there should be too many return values, or else you
put too much runtime policy into the filters.
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.
Greetings,
Indan
next prev parent reply other threads:[~2012-02-23 22:16 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-21 17:30 [PATCH v10 01/11] sk_run_filter: add support for custom load_pointer Will Drewry
2012-02-21 17:30 ` [PATCH v10 02/11] seccomp: kill the seccomp_t typedef Will Drewry
2012-02-21 17:30 ` [PATCH v10 03/11] asm/syscall.h: add syscall_get_arch Will Drewry
2012-02-21 18:46 ` Roland McGrath
2012-02-21 18:57 ` Will Drewry
2012-02-21 19:01 ` [PATCH v11 " Will Drewry
2012-02-21 17:30 ` [PATCH v10 04/11] arch/x86: add syscall_get_arch to syscall.h Will Drewry
2012-02-21 17:30 ` [PATCH v10 05/11] seccomp: add system call filtering using BPF Will Drewry
2012-02-22 6:32 ` H. Peter Anvin
2012-02-22 19:48 ` Will Drewry
2012-02-22 8:19 ` Indan Zupancic
2012-02-22 14:23 ` Ben Hutchings
2012-02-22 19:47 ` Will Drewry
2012-02-22 23:46 ` Indan Zupancic
2012-02-22 23:51 ` Andrew Lutomirski
2012-02-23 0:08 ` Indan Zupancic
2012-02-23 1:07 ` H. Peter Anvin
2012-02-22 23:03 ` Indan Zupancic
2012-02-22 19:47 ` Will Drewry
2012-02-22 19:53 ` H. Peter Anvin
2012-02-22 20:01 ` Will Drewry
2012-02-23 0:25 ` Indan Zupancic
2012-02-21 17:30 ` [PATCH v10 06/11] seccomp: add SECCOMP_RET_ERRNO Will Drewry
2012-02-21 22:41 ` Kees Cook
2012-02-21 22:48 ` Will Drewry
2012-02-21 17:30 ` [PATCH v10 07/11] signal, x86: add SIGSYS info and make it synchronous Will Drewry
2012-02-22 8:34 ` Indan Zupancic
2012-02-22 19:48 ` Will Drewry
2012-02-22 23:38 ` Andrew Lutomirski
2012-02-22 23:53 ` Kees Cook
2012-02-23 0:05 ` Will Drewry
2012-02-23 0:08 ` Kees Cook
2012-02-23 0:29 ` H. Peter Anvin
2012-02-23 0:50 ` Roland McGrath
2012-02-23 1:06 ` H. Peter Anvin
2012-02-23 17:38 ` Roland McGrath
2012-02-23 19:26 ` Will Drewry
2012-02-23 22:15 ` Indan Zupancic [this message]
2012-02-23 22:33 ` Markus Gutschke
2012-02-23 22:36 ` Will Drewry
2012-02-27 12:32 ` Indan Zupancic
2012-02-27 16:21 ` Will Drewry
2012-02-23 22:34 ` [kernel-hardening] " Will Drewry
2012-02-23 16:44 ` Will Drewry
2012-02-23 0:11 ` Roland McGrath
2012-02-21 17:30 ` [PATCH v10 08/11] seccomp: Add SECCOMP_RET_TRAP Will Drewry
2012-02-21 17:30 ` [PATCH v10 09/11] ptrace,seccomp: Add PTRACE_SECCOMP support Will Drewry
2012-02-22 12:22 ` Indan Zupancic
2012-02-22 19:47 ` [kernel-hardening] " Will Drewry
2012-02-21 17:30 ` [PATCH v10 10/11] x86: Enable HAVE_ARCH_SECCOMP_FILTER Will Drewry
2012-02-21 17:30 ` [PATCH v10 11/11] Documentation: prctl/seccomp_filter Will Drewry
2012-02-21 23:12 ` Kees Cook
2012-02-22 3:41 ` Will Drewry
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