From: ebiederm@xmission.com (Eric W. Biederman)
To: "Manfred Spraul" <manfred@colorfullife.com>
Cc: <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] Longstanding elf fix (2.4.3 fix)
Date: 24 Apr 2001 01:19:28 -0600 [thread overview]
Message-ID: <m1zod6rchr.fsf@frodo.biederman.org> (raw)
In-Reply-To: <004201c0cc40$07c79ef0$5517fea9@local>
In-Reply-To: "Manfred Spraul"'s message of "Mon, 23 Apr 2001 23:54:22 +0200"
"Manfred Spraul" <manfred@colorfullife.com> writes:
> > Well looking a little more closely than I did last night it looks like
> > access_process_vm (called from ptrace) can cause what amounts to a
> > page fault at pretty arbitrary times.
>
> It's also used for several /proc/<pid> files.
>
> I remember that I got crashes with concurrent exec+cat
> /proc/<pid>/cmdline until down(mmap_sem) was added into
> setup_arg_pages().
O.k. Then the race I'm catching is real though because it is confined
to bss sections, we are quite unlikely to trigger it.
Eric
next prev parent reply other threads:[~2001-04-24 7:21 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-04-23 21:54 [PATCH] Longstanding elf fix (2.4.3 fix) Manfred Spraul
2001-04-24 7:19 ` Eric W. Biederman [this message]
-- strict thread matches above, loose matches on Subject: below --
2001-04-23 0:14 Eric W. Biederman
2001-04-23 3:15 ` David S. Miller
2001-04-23 7:44 ` Eric W. Biederman
2001-04-23 7:59 ` Philip Blundell
2001-04-23 16:05 ` Eric W. Biederman
2001-04-23 17:39 ` Linus Torvalds
2001-04-23 18:54 ` Eric W. Biederman
2001-04-24 22:34 ` Ion Badulescu
2001-04-24 23:34 ` Eric W. Biederman
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