From: Dave Jones <davej@redhat.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Joe Perches <joe@perches.com>, Dave Chinner <david@fromorbit.com>,
viro@zeniv.linux.org.uk,
Linux Kernel <linux-kernel@vger.kernel.org>,
David Rientjes <rientjes@google.com>
Subject: Re: suppress page allocation failure warnings from sys_listxattr
Date: Wed, 28 Mar 2012 23:00:00 -0400 [thread overview]
Message-ID: <20120329025959.GA21577@redhat.com> (raw)
In-Reply-To: <20120328192804.7326bce9.akpm@linux-foundation.org>
On Wed, Mar 28, 2012 at 07:28:04PM -0700, Andrew Morton wrote:
> > But it looks like
> > key_add (see other thread from this evening) and probably others can be
> > called as a user and gobble up vmalloc space. omnomnom.
>
> hm, the keys code appears to prevent the user from reserving more than
> 20000 bytes of memory total (key_payload_reserve()), so it doesn't look
> very useful for screwing up vmalloc().
Then how did I trick it into trying an order 8 allocation ?
trinity: page allocation failure: order:8, mode:0x40d0
Pid: 27119, comm: trinity Not tainted 3.3.0+ #31
Call Trace:
[<ffffffff8115dd66>] warn_alloc_failed+0xf6/0x160
[<ffffffff816ad436>] ? __alloc_pages_direct_compact+0x1d0/0x1e2
[<ffffffff81162492>] __alloc_pages_nodemask+0x8b2/0xb10
[<ffffffff8119dae6>] alloc_pages_current+0xb6/0x120
[<ffffffff8115d3b4>] __get_free_pages+0x14/0x50
[<ffffffff811ac64f>] kmalloc_order_trace+0x3f/0x1a0
[<ffffffff811aca0a>] __kmalloc+0x25a/0x280
[<ffffffff812c034a>] sys_add_key+0x9a/0x210
[<ffffffff813386be>] ? trace_hardirqs_on_thunk+0x3a/0x3f
[<ffffffff816c04e9>] system_call_fastpath+0x16/0x1b
next prev parent reply other threads:[~2012-03-29 3:00 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-13 18:22 suppress page allocation failure warnings from sys_listxattr Dave Jones
2012-03-13 21:33 ` Colin Walters
2012-03-27 22:51 ` Andrew Morton
2012-03-28 0:15 ` Dave Jones
2012-03-28 0:26 ` Andrew Morton
2012-03-28 7:13 ` David Rientjes
2012-03-28 4:39 ` Dave Chinner
2012-03-28 23:47 ` Andrew Morton
2012-03-29 0:54 ` Dave Jones
2012-03-29 1:10 ` Andrew Morton
2012-03-29 1:28 ` Joe Perches
2012-03-29 1:46 ` Andrew Morton
2012-03-29 1:50 ` Dave Jones
2012-03-29 2:02 ` Andrew Morton
2012-03-29 2:08 ` Dave Jones
2012-03-29 2:28 ` Andrew Morton
2012-03-29 3:00 ` Dave Jones [this message]
2012-03-29 21:09 ` Andrew Morton
2012-03-29 21:13 ` Dave Jones
2012-03-29 5:35 ` Dave Chinner
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