Re: [PATCH] x86: make DR*_RESERVED unsigned long

From: H. Peter Anvin
Date: Wed Apr 24 2013 - 15:45:40 EST

On 04/24/2013 10:07 AM, Oleg Nesterov wrote:
> DR6_RESERVED and DR_CONTROL_RESERVED are used to clear the set
> bits in the "unsigned long" data, make them long to ensure that
> "&~" doesn't clear the upper bits.
> do_debug() and ptrace_write_dr7() which use DR*_RESERVED look
> safe, but probably it makes sense to cleanup anyway.
> Reported-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
> Signed-off-by: Oleg Nesterov <oleg@xxxxxxxxxx>

Can you please put in the description if this is a manifest or
non-manifest bug and, if manifest, what the issues are? It greatly
affects what we otherwise have to do to address the bug.

Also, the -UL suffix is usually capitalized in our codebase.


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