From: Hannes Reinecke <hare@suse.de>
To: Dmitry Monakhov <dmonakhov@openvz.org>,
linux-kernel@vger.kernel.org, linux-block@vger.kernel.org,
martin.petersen@oracle.com
Subject: Re: [PATCH 1/9] bio-integrity: Do not allocate integrity context for bio w/o data
Date: Wed, 5 Apr 2017 08:32:30 +0200 [thread overview]
Message-ID: <062accdf-a6c4-7cdf-db87-262c8410465e@suse.de> (raw)
In-Reply-To: <1491332201-26926-2-git-send-email-dmonakhov@openvz.org>
On 04/04/2017 08:56 PM, Dmitry Monakhov wrote:
> If bio has no data, such as ones from blkdev_issue_flush(),
> then we have nothing to protect.
>
> This patch prevent bugon like follows:
>
> kfree_debugcheck: out of range ptr ac1fa1d106742a5ah
> kernel BUG at mm/slab.c:2773!
> invalid opcode: 0000 [#1] SMP
> Modules linked in: bcache
> CPU: 0 PID: 4428 Comm: xfs_io Tainted: G W 4.11.0-rc4-ext4-00041-g2ef0043-dirty #43
> Hardware name: Virtuozzo KVM, BIOS seabios-1.7.5-11.vz7.4 04/01/2014
> task: ffff880137786440 task.stack: ffffc90000ba8000
> RIP: 0010:kfree_debugcheck+0x25/0x2a
> RSP: 0018:ffffc90000babde0 EFLAGS: 00010082
> RAX: 0000000000000034 RBX: ac1fa1d106742a5a RCX: 0000000000000007
> RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88013f3ccb40
> RBP: ffffc90000babde8 R08: 0000000000000000 R09: 0000000000000000
> R10: 00000000fcb76420 R11: 00000000725172ed R12: 0000000000000282
> R13: ffffffff8150e766 R14: ffff88013a145e00 R15: 0000000000000001
> FS: 00007fb09384bf40(0000) GS:ffff88013f200000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00007fd0172f9e40 CR3: 0000000137fa9000 CR4: 00000000000006f0
> Call Trace:
> kfree+0xc8/0x1b3
> bio_integrity_free+0xc3/0x16b
> bio_free+0x25/0x66
> bio_put+0x14/0x26
> blkdev_issue_flush+0x7a/0x85
> blkdev_fsync+0x35/0x42
> vfs_fsync_range+0x8e/0x9f
> vfs_fsync+0x1c/0x1e
> do_fsync+0x31/0x4a
> SyS_fsync+0x10/0x14
> entry_SYSCALL_64_fastpath+0x1f/0xc2
>
> Reviewed-by: Christoph Hellwig <hch@lst.de>
> Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org>
> ---
> block/bio-integrity.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/block/bio-integrity.c b/block/bio-integrity.c
> index 5384713..b5009a8 100644
> --- a/block/bio-integrity.c
> +++ b/block/bio-integrity.c
> @@ -175,6 +175,9 @@ bool bio_integrity_enabled(struct bio *bio)
> if (bio_op(bio) != REQ_OP_READ && bio_op(bio) != REQ_OP_WRITE)
> return false;
>
> + if (!bio_sectors(bio))
> + return false;
> +
> /* Already protected? */
> if (bio_integrity(bio))
> return false;
>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Cheers,
Hannes
--
Dr. Hannes Reinecke Teamlead Storage & Networking
hare@suse.de +49 911 74053 688
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: F. Imendörffer, J. Smithard, J. Guild, D. Upmanyu, G. Norton
HRB 21284 (AG Nürnberg)
next prev parent reply other threads:[~2017-04-05 6:32 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-04-04 18:56 [PATCH 0/9] block: T10/DIF Fixes and cleanups v3 Dmitry Monakhov
2017-04-04 18:56 ` [PATCH 1/9] bio-integrity: Do not allocate integrity context for bio w/o data Dmitry Monakhov
2017-04-05 6:32 ` Hannes Reinecke [this message]
2017-04-20 2:34 ` Martin K. Petersen
2017-04-04 18:56 ` [PATCH 2/9] bio-integrity: bio_trim should truncate integrity vector accordingly Dmitry Monakhov
2017-04-05 6:32 ` Hannes Reinecke
2017-04-20 2:34 ` Martin K. Petersen
2017-04-04 18:56 ` [PATCH 3/9] bio-integrity: bio_integrity_advance must update integrity seed Dmitry Monakhov
2017-04-05 6:34 ` Hannes Reinecke
2017-04-06 11:35 ` Christoph Hellwig
2017-04-20 2:36 ` Martin K. Petersen
2017-05-03 16:06 ` Dmitry Monakhov
2017-05-03 16:10 ` Martin K. Petersen
2017-04-04 18:56 ` [PATCH 4/9] bio-integrity: fix interface for bio_integrity_trim v2 Dmitry Monakhov
2017-04-05 6:36 ` Hannes Reinecke
2017-04-06 11:36 ` Christoph Hellwig
2017-04-20 2:38 ` Martin K. Petersen
2017-04-04 18:56 ` [PATCH 5/9] bio-integrity: fold bio_integrity_enabled to bio_integrity_prep Dmitry Monakhov
2017-04-05 6:37 ` Hannes Reinecke
2017-04-06 11:43 ` Christoph Hellwig
2017-04-20 2:40 ` Martin K. Petersen
2017-04-04 18:56 ` [PATCH 6/9] T10: Move opencoded contants to common header Dmitry Monakhov
2017-04-05 6:37 ` Hannes Reinecke
2017-04-06 11:44 ` Christoph Hellwig
2017-04-20 2:44 ` Martin K. Petersen
2017-04-04 18:56 ` [PATCH 7/9] Guard bvec iteration logic v3 Dmitry Monakhov
2017-04-05 6:39 ` Hannes Reinecke
2017-04-06 11:46 ` Christoph Hellwig
2017-04-04 18:56 ` [PATCH 8/9] bio: add bvec_iter rewind API Dmitry Monakhov
2017-04-05 6:39 ` Hannes Reinecke
2017-04-06 11:49 ` Christoph Hellwig
2017-04-20 2:51 ` Martin K. Petersen
2017-04-04 18:56 ` [PATCH 9/9] bio-integrity: Restore original iterator on verify stage Dmitry Monakhov
2017-04-05 6:41 ` Hannes Reinecke
2017-04-06 11:49 ` Christoph Hellwig
2017-05-02 7:31 ` [PATCH 0/9] block: T10/DIF Fixes and cleanups v3 Christoph Hellwig
2017-05-10 15:28 ` Dmitry Monakhov
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