* Data races in generic_fillattr()
@ 2014-04-14 18:24 Pedro Fonseca
2014-04-24 11:55 ` Pedro Fonseca
0 siblings, 1 reply; 2+ messages in thread
From: Pedro Fonseca @ 2014-04-14 18:24 UTC (permalink / raw)
To: linux-fsdevel; +Cc: viro, Theodore Ts'o
Hi,
I've noticed that the function generic_fillattr() (fs/stat.c) in
involved in multiple data races. Initially I reported this problem on
the ext4 mailing list but it seems to be more general to the VFS layer.
Because of limited locking, when the inodes are updated and a stat()
system call is concurrently executed, several 64-bit fields (e.g.,
atime, mtime, ctime, blocks) can potentially get incorrect values on
32-bit architectures. In addition, it seems that it can also cause
inconsistencies between the "blocks" field and the "size" field.
I would be glad if you could have a look at this problem and let me know
if it's going to be fixed.
Thanks,
Pedro
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: Data races in generic_fillattr()
2014-04-14 18:24 Data races in generic_fillattr() Pedro Fonseca
@ 2014-04-24 11:55 ` Pedro Fonseca
0 siblings, 0 replies; 2+ messages in thread
From: Pedro Fonseca @ 2014-04-24 11:55 UTC (permalink / raw)
To: linux-fsdevel; +Cc: viro, Theodore Ts'o
Anybody had a chance to look at this?
Pedro
On 04/14/2014 08:24 PM, Pedro Fonseca wrote:
> Hi,
>
> I've noticed that the function generic_fillattr() (fs/stat.c) in
> involved in multiple data races. Initially I reported this problem on
> the ext4 mailing list but it seems to be more general to the VFS layer.
>
> Because of limited locking, when the inodes are updated and a stat()
> system call is concurrently executed, several 64-bit fields (e.g.,
> atime, mtime, ctime, blocks) can potentially get incorrect values on
> 32-bit architectures. In addition, it seems that it can also cause
> inconsistencies between the "blocks" field and the "size" field.
>
> I would be glad if you could have a look at this problem and let me
> know if it's going to be fixed.
>
> Thanks,
> Pedro
^ permalink raw reply [flat|nested] 2+ messages in thread
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