Re: [PATCH V2] futex: Fix the write access fault problem for real

[Linus Torvalds]

On Wed, 24 Jun 2009, Thomas Gleixner wrote:
> 
> The solution is to not rely on access_ok and get_user() for any write
> access related fault on private and shared futexes. Instead we need to
> fault it in with verification of write access.
> 
> There is no generic non destructive write mechanism which would fault
> the user page in trough a #PF, but as we already know that we will
> fault we can as well call get_user_pages() directly and avoid the #PF
> overhead.

Ack. Patch looks saner this way, and the commit message explains the 
issues.

		Linus
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/