From: Oleg Nesterov <oleg@redhat.com>
To: "Gábor Melis" <mega@retes.hu>
Cc: linux-kernel@vger.kernel.org, Andrew Morton <akpm@linux-foundation.org>
Subject: Re: Signal delivery order
Date: Mon, 16 Mar 2009 01:28:33 +0100 [thread overview]
Message-ID: <20090316002833.GA17615@redhat.com> (raw)
In-Reply-To: <200903152306.53031.mega@retes.hu>
On 03/15, Gábor Melis wrote:
>
> On Domingo 15 Marzo 2009, Oleg Nesterov wrote:
> > >
> > Now, since there are no more pending signals, we return to the user
> > space, and start sig_2().
>
> I see. I guess in addition to changing the ip, the stack frobbing magic
> arranges that sig_2 returns to sig_1 or some code that calls sig_1.
yes. "some code" == rt_sigreturn,
> The revised signal-delivery-order.c (also attached) outputs:
>
> test_handler=8048727
> sigsegv_handler=804872c
> eip: 8048727
> esp: b7d94cb8
>
> which shows that sigsegv_handler also has incorrect eip in the context.
Why do you think it is not correct?
I didn't try your test-case, but I can't see where "esp: b7d94cb8"
comes from. But "eip: 8048727" looks exactly right, this is the
address of test_handler.
Oleg.
next prev parent reply other threads:[~2009-03-16 0:32 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-03-14 16:50 Signal delivery order Gábor Melis
2009-03-15 9:44 ` Oleg Nesterov
2009-03-15 14:40 ` Gábor Melis
2009-03-15 17:29 ` Oleg Nesterov
2009-03-15 22:06 ` Gábor Melis
2009-03-16 0:28 ` Oleg Nesterov [this message]
2009-03-16 8:34 ` Gábor Melis
2009-03-16 21:13 ` Oleg Nesterov
2009-03-16 22:56 ` Chris Friesen
2009-03-17 4:13 ` Q: SEGSEGV && uc_mcontext->ip (Was: Signal delivery order) Oleg Nesterov
2009-03-17 4:25 ` Oleg Nesterov
2009-03-17 8:23 ` Gábor Melis
2009-03-17 9:25 ` Oleg Nesterov
2009-03-17 10:20 ` Gábor Melis
2009-03-17 10:43 ` Oleg Nesterov
2009-03-17 15:56 ` Linus Torvalds
2009-03-17 19:20 ` Q: SEGSEGV && uc_mcontext->ip David Miller
2009-03-18 9:58 ` Q: SEGSEGV && uc_mcontext->ip (Was: Signal delivery order) Gábor Melis
2009-03-18 7:59 ` Roland McGrath
2009-03-18 9:02 ` RT signal queue overflow (Was: Q: SEGSEGV && uc_mcontext->ip (Was: Signal delivery order)) Gábor Melis
2009-03-18 14:52 ` Linus Torvalds
2009-03-18 15:23 ` Gábor Melis
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