Re: FW: Linux kernel file offset pointer races

Marcelo Tosatti
2004-08-11T21:39:41Z

On Wed, Aug 11, 2004 at 06:26:02PM +0400, Andrey Savochkin wrote:
> BTW, f_pos assignments are non-atomic on IA-32 since it's a 64-bit value.
> The file position is protected by the BKL in llseek(), but I do not see any
> serialization neither in sys_read() nor in generic_file_read() and other
> methods.
>
> Have we accepted that the file position may be corrupted after crossing 2^32
> boundary by 2 processes reading in parallel from the same file?
> Or am I missing something?

Yes, as far as I know, parallel users of the same file descriptions (which
can race on 64-bit architectures) is expected, we dont care about handling it.

Behaviour is undefined.