linux-kernel - Re: [PATCH] jfs: fix shift-out-of-bounds in dbJoin

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Date: Mon, 29 Jan 2024 08:39:18 -0600
From: Dave Kleikamp <dave.kleikamp@...cle.com>
To: Matthew Wilcox <willy@...radead.org>,
        Manas Ghandat <ghandatmanas@...il.com>
Cc: Linux-kernel-mentees@...ts.linuxfoundation.org,
        jfs-discussion@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
        syzbot+411debe54d318eaed386@...kaller.appspotmail.com,
        Sasha Levin <sashal@...nel.org>
Subject: Re: [PATCH] jfs: fix shift-out-of-bounds in dbJoin

On 1/28/24 2:49PM, Matthew Wilcox wrote:
> On Wed, Oct 11, 2023 at 08:09:37PM +0530, Manas Ghandat wrote:
>> Currently while joining the leaf in a buddy system there is shift out
>> of bound error in calculation of BUDSIZE. Added the required check
>> to the BUDSIZE and fixed the documentation as well.
> 
> This patch causes xfstests to fail frequently.  The one this trace is
> from was generic/074.

Thanks for catching this. The sanity test is not right, so we need to 
revert that one.

Shaggy

> 
> Sasha, I see this one was AUTOSEL.  Please stop it from going into
> -stable.
> 
> 00274 [failed, exit status 1]------------[ cut here ]------------
> 00274 kernel BUG at fs/jfs/inode.c:169!
> 00274 invalid opcode: 0000 [#1] PREEMPT SMP NOPTI
> 00274 CPU: 7 PID: 52174 Comm: umount Kdump: loaded Tainted: G                 N 6.7.0-rc2-00020-gcca974daeb6c #442
> 00274 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
> 00274 RIP: 0010:jfs_evict_inode+0xfb/0x110
> 00274 Code: 28 fc ff ff a8 04 75 24 4d 85 e4 74 10 49 83 7c 24 80 00 74 08 48 89 df e8 e2 a5 00 00 48 89 df e8 3a 95 ee ff e9 2f ff ff ff <0f> 0b 48 89 df e8 0b 28 00 00 eb d2 66 0f 1f 84 00 00 00 00 00 90
> 00274 RSP: 0018:ffff8880080bbd48 EFLAGS: 00010287
> 00274 RAX: ffff88804b209a80 RBX: ffff88804b209df8 RCX: 0000000000000000
> 00274 RDX: ffff88800b813ce0 RSI: ffffffff8217a259 RDI: ffff88804b209df8
> 00274 RBP: ffff8880080bbd58 R08: 0000000000000001 R09: 0000000000000001
> 00274 R10: ffff8880551e4540 R11: 0000000000000001 R12: ffff88804b209fa8
> 00274 R13: ffffffff81e35fa0 R14: ffff88800eaae7d0 R15: ffff88800eaae7d0
> 00274 FS:  00007f4f5784a840(0000) GS:ffff88807d9c0000(0000) knlGS:0000000000000000
> 00274 CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> 00274 CR2: 00007f4f57ae2c00 CR3: 000000000a5c4005 CR4: 0000000000770eb0
> 00274 PKRU: 55555554
> 00274 Call Trace:
> 00274  <TASK>
> 00274  ? show_regs+0x60/0x70
> 00274  ? die+0x32/0x90
> 00274  ? do_trap+0xbf/0xe0
> 00274  ? do_error_trap+0x75/0x110
> 00274  ? jfs_evict_inode+0xfb/0x110
> 00274  ? exc_invalid_op+0x52/0x70
> 00274  ? jfs_evict_inode+0xfb/0x110
> 00274  ? asm_exc_invalid_op+0x1b/0x20
> 00274  ? jfs_evict_inode+0xfb/0x110
> 00274  ? jfs_evict_inode+0x3a/0x110
> 00274  evict+0xcc/0x1d0
> 00274  dispose_list+0x48/0x80
> 00274  evict_inodes+0x14c/0x190
> 00274  generic_shutdown_super+0x34/0x160
> 00274  kill_block_super+0x16/0x40
> 00274  deactivate_locked_super+0x2d/0xa0
> 00274  deactivate_super+0x3b/0x50
> 00274  cleanup_mnt+0xbe/0x160
> 00274  __cleanup_mnt+0xd/0x20
> 00274  task_work_run+0x59/0xa0
> 00274  exit_to_user_mode_prepare+0x175/0x180
> 00274  syscall_exit_to_user_mode+0x1d/0x50
> 00274  do_syscall_64+0x4e/0xf0
> 00274  entry_SYSCALL_64_after_hwframe+0x6e/0x76
> 00274 RIP: 0033:0x7f4f57a76857
> 00274 Code: af 95 0c 00 f7 d8 64 89 01 48 83 c8 ff c3 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 8b 15 79 95 0c 00 f7 d8 64 89 02 b8
> 00274 RSP: 002b:00007fff75aa4be8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
> 00274 RAX: 0000000000000000 RBX: 00005586b9c30ad8 RCX: 00007f4f57a76857
> 00274 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00005586b9c343e0
> 00274 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000073
> 00274 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f4f57bb1264
> 00274 R13: 00005586b9c343e0 R14: 00005586b9c30bf0 R15: 00005586b9c309c0
> 00274  </TASK>
> 00274 Modules linked in:
> 
> I haven't attempted to dig into why yet.
> 
>> Reported-by: syzbot+411debe54d318eaed386@...kaller.appspotmail.com
>> Closes: https://syzkaller.appspot.com/bug?extid=411debe54d318eaed386
>> Signed-off-by: Manas Ghandat <ghandatmanas@...il.com>
>> ---
>>   fs/jfs/jfs_dmap.c | 8 +++++++-
>>   1 file changed, 7 insertions(+), 1 deletion(-)
>>
>> diff --git a/fs/jfs/jfs_dmap.c b/fs/jfs/jfs_dmap.c
>> index 6b838d3ae7c2..baa97bda1c7a 100644
>> --- a/fs/jfs/jfs_dmap.c
>> +++ b/fs/jfs/jfs_dmap.c
>> @@ -2730,7 +2730,9 @@ static int dbBackSplit(dmtree_t * tp, int leafno)
>>    *	leafno	- the number of the leaf to be updated.
>>    *	newval	- the new value for the leaf.
>>    *
>> - * RETURN VALUES: none
>> + * RETURN VALUES:
>> + *  0		- success
>> + *	-EIO	- i/o error
>>    */
>>   static int dbJoin(dmtree_t * tp, int leafno, int newval)
>>   {
>> @@ -2757,6 +2759,10 @@ static int dbJoin(dmtree_t * tp, int leafno, int newval)
>>   		 * get the buddy size (number of words covered) of
>>   		 * the new value.
>>   		 */
>> +
>> +		if ((newval - tp->dmt_budmin) > BUDMIN)
>> +			return -EIO;
>> +
>>   		budsz = BUDSIZE(newval, tp->dmt_budmin);
>>   
>>   		/* try to join.
>> -- 
>> 2.37.2
>>