From: Dan Aloni <dan@kernelim.com>
To: Sasha Levin <sasha.levin@oracle.com>
Cc: Dave Jones <davej@redhat.com>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
Andrew Morton <akpm@linux-foundation.org>,
Ingo Molnar <mingo@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
LKML <linux-kernel@vger.kernel.org>,
"netdev@vger.kernel.org" <netdev@vger.kernel.org>
Subject: Re: mm/sched/net: BUG when running simple code
Date: Tue, 17 Jun 2014 07:30:14 +0300 [thread overview]
Message-ID: <20140617043014.GA18161@gmail.com> (raw)
In-Reply-To: <539FB363.1070302@oracle.com>
On Mon, Jun 16, 2014 at 11:17:55PM -0400, Sasha Levin wrote:
> On 06/13/2014 12:13 AM, Dave Jones wrote:
> > On Fri, Jun 13, 2014 at 12:01:37AM -0400, Sasha Levin wrote:
> > another theory: Trinity can sometimes generate plausible looking module
> > addresses and pass those in structs etc.
> >
> > I wonder if there's somewhere in that path that isn't checking that the address
> > in the optval it got is actually a userspace address before it tries to write to it.
>
> It happened again, and this time I've left the kernel addresses in, and it's quite
> interesting:
>
> [ 88.837926] Call Trace:
> [ 88.837926] [<ffffffff9ff6a792>] __sock_create+0x292/0x3c0
> [ 88.837926] [<ffffffff9ff6a610>] ? __sock_create+0x110/0x3c0
> [ 88.837926] [<ffffffff9ff6a920>] sock_create+0x30/0x40
> [ 88.837926] [<ffffffff9ff6ad4c>] SyS_socket+0x2c/0x70
> [ 88.837926] [<ffffffffa0561c30>] ? tracesys+0x7e/0xe6
> [ 88.837926] [<ffffffffa0561c93>] tracesys+0xe1/0xe6
>
> tracesys() seems to live inside a module space here?
I think it's more likely kASLR. The Documentation/x86/x86_64/mm.txt doc needs updating.
--
Dan Aloni
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next prev parent reply other threads:[~2014-06-17 4:30 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-06-13 2:56 mm/sched/net: BUG when running simple code Sasha Levin
2014-06-13 3:27 ` Dan Aloni
2014-06-13 4:01 ` Sasha Levin
2014-06-13 4:13 ` Dave Jones
2014-06-13 15:13 ` Sasha Levin
2014-06-17 3:17 ` Sasha Levin
2014-06-17 4:30 ` Dan Aloni [this message]
2014-06-13 4:55 ` Dan Aloni
2014-06-13 5:26 ` Dan Aloni
2014-06-13 5:31 ` Dan Aloni
2014-07-08 14:51 ` Peter Zijlstra
2014-07-08 15:25 ` Sasha Levin
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