linux-kernel - Re: [PATCH 01/16] mm: add anon_vma_lock to validate

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Date:	Tue, 6 Nov 2012 00:00:59 -0800
From:	Michel Lespinasse <walken@...gle.com>
To:	Sasha Levin <sasha.levin@...cle.com>, Bob Liu <lliubbo@...il.com>
Cc:	Rik van Riel <riel@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Hugh Dickins <hughd@...gle.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [PATCH 01/16] mm: add anon_vma_lock to validate_mm()

Adding Sasha and Bob, which I forgot to CC in the original message.

On Mon, Nov 5, 2012 at 3:06 PM, Rik van Riel <riel@...hat.com> wrote:
> On 11/05/2012 05:46 PM, Michel Lespinasse wrote:
>>
>> Iterate vma->anon_vma_chain without anon_vma_lock may cause NULL ptr deref
>> in
>> anon_vma_interval_tree_verify(), because the node in the chain might have
>> been
>> removed.
>>
>> [ 1523.657950] BUG: unable to handle kernel paging request at
>> fffffffffffffff0
>> [ 1523.660022] IP: [<ffffffff8122c29c>]
>> anon_vma_interval_tree_verify+0xc/0xa0
>> [ 1523.660022] PGD 4e28067 PUD 4e29067 PMD 0
>> [ 1523.675725] Oops: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC
>> [ 1523.750066] CPU 0
>> [ 1523.750066] Pid: 9050, comm: trinity-child64 Tainted: G        W
>> 3.7.0-rc2-next-20121025-sasha-00001-g673f98e-dirty #77
>> [ 1523.750066] RIP: 0010:[<ffffffff8122c29c>]  [<ffffffff8122c29c>]
>> anon_vma_interval_tree_verify+0xc/0xa0
>> [ 1523.750066] RSP: 0018:ffff880045f81d48  EFLAGS: 00010296
>> [ 1523.750066] RAX: 0000000000000000 RBX: fffffffffffffff0 RCX:
>> 0000000000000000
>> [ 1523.750066] RDX: 0000000000000000 RSI: 0000000000000001 RDI:
>> fffffffffffffff0
>> [ 1523.750066] RBP: ffff880045f81d58 R08: 0000000000000000 R09:
>> 0000000000000f14
>> [ 1523.750066] R10: 0000000000000f12 R11: 0000000000000000 R12:
>> ffff8800096c8d70
>> [ 1523.750066] R13: ffff8800096c8d00 R14: 0000000000000000 R15:
>> ffff8800095b45e0
>> [ 1523.750066] FS:  00007f7a923f3700(0000) GS:ffff880013600000(0000)
>> knlGS:0000000000000000
>> [ 1523.750066] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>> [ 1523.750066] CR2: fffffffffffffff0 CR3: 000000000969d000 CR4:
>> 00000000000406f0
>> [ 1523.750066] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
>> 0000000000000000
>> [ 1523.750066] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7:
>> 0000000000000400
>> [ 1523.750066] Process trinity-child64 (pid: 9050, threadinfo
>> ffff880045f80000, task ffff880048eb0000)
>> [ 1523.750066] Stack:
>> [ 1523.750066]  ffff88000d7533f0 fffffffffffffff0 ffff880045f81da8
>> ffffffff812361d8
>> [ 1523.750066]  ffff880045f81d98 ffff880048ee9000 ffff8800095b4580
>> ffff8800095b4580
>> [ 1523.750066]  ffff88001d1cdb00 ffff8800095b45f0 ffff880022a4d630
>> ffff8800095b45e0
>> [ 1523.750066] Call Trace:
>> [ 1523.750066]  [<ffffffff812361d8>] validate_mm+0x58/0x1e0
>> [ 1523.750066]  [<ffffffff81236aa5>] vma_adjust+0x635/0x6b0
>> [ 1523.750066]  [<ffffffff81236c81>] __split_vma.isra.22+0x161/0x220
>> [ 1523.750066]  [<ffffffff81237934>] split_vma+0x24/0x30
>> [ 1523.750066]  [<ffffffff8122ce6a>] sys_madvise+0x5da/0x7b0
>> [ 1523.750066]  [<ffffffff811cd14c>] ? rcu_eqs_exit+0x9c/0xb0
>> [ 1523.750066]  [<ffffffff811802cd>] ? trace_hardirqs_on+0xd/0x10
>> [ 1523.750066]  [<ffffffff83aee198>] tracesys+0xe1/0xe6
>> [ 1523.750066] Code: 4c 09 ff 48 39 ce 77 9e f3 c3 0f 1f 44 00 00 31 c0 c3
>> 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 55 48 89 e5 53
>> 48 89 fb 48 83 ec 08 <48> 8b 17 48 8b 8a 90 00 00 00 48 39 4f 40 74 34 80
>> 3d f7 1f 5c
>> [ 1523.750066] RIP  [<ffffffff8122c29c>]
>> anon_vma_interval_tree_verify+0xc/0xa0
>> [ 1523.750066]  RSP <ffff880045f81d48>
>> [ 1523.750066] CR2: fffffffffffffff0
>> [ 1523.750066] ---[ end trace e35e5fa49072faf9 ]---
>>
>> Reported-by: Sasha Levin <sasha.levin@...cle.com>
>> Figured-out-by: Bob Liu <lliubbo@...il.com>
>> Signed-off-by: Michel Lespinasse <walken@...gle.com>
>
> Reviewed-by: Rik van Riel <riel@...hat.com>

-- 
Michel "Walken" Lespinasse
A program is never fully debugged until the last user dies.
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