diff mbox

[1/9] bio-integrity: Do not allocate integrity context for bio w/o data

Message ID 1494429652-9488-2-git-send-email-dmonakhov@openvz.org (mailing list archive)
State New, archived
Headers show

Commit Message

Dmitry Monakhov May 10, 2017, 3:20 p.m. UTC 
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>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org>
---
 block/bio-integrity.c | 3 +++
 1 file changed, 3 insertions(+)

Comments

Christoph Hellwig May 11, 2017, 7:30 a.m. UTC | #1 
Jens, can you pick this up for 4.12?

On Wed, May 10, 2017 at 07:20:44PM +0400, 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>
> Reviewed-by: Hannes Reinecke <hare@suse.com>
> Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
> 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;
> -- 
> 2.9.3
> 
---end quoted text---
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Christoph Hellwig May 21, 2017, 7:12 a.m. UTC | #2 
On Thu, May 11, 2017 at 12:30:32AM -0700, Christoph Hellwig wrote:
> Jens, can you pick this up for 4.12?

ping?

> On Wed, May 10, 2017 at 07:20:44PM +0400, 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>
> > Reviewed-by: Hannes Reinecke <hare@suse.com>
> > Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
> > 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;
> > -- 
> > 2.9.3
> > 
> ---end quoted text---
---end quoted text---
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diff mbox

Patch

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;