linux-kernel - Re: [PATCH 2/6] treewide: remove using list iterator after loop body as a ptr

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Date:   Wed, 2 Mar 2022 12:59:28 -0800
From:   Kees Cook <keescook@...omium.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Rasmus Villemoes <linux@...musvillemoes.dk>,
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Subject: Re: [PATCH 2/6] treewide: remove using list iterator after loop body
 as a ptr

On Wed, Mar 02, 2022 at 12:18:45PM -0800, Linus Torvalds wrote:
> On Wed, Mar 2, 2022 at 12:07 PM Kees Cook <keescook@...omium.org> wrote:
> >
> > I've long wanted to change kfree() to explicitly set pointers to NULL on
> > free. https://github.com/KSPP/linux/issues/87
> 
> We've had this discussion with the gcc people in the past, and gcc
> actually has some support for it, but it's sadly tied to the actual
> function name (ie gcc has some special-casing for "free()")
> 
> See
> 
>     https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94527
> 
> for some of that discussion.
> 
> Oh, and I see some patch actually got merged since I looked there last
> so that you can mark "deallocator" functions, but I think it's only
> for the context matching, not for actually killing accesses to the
> pointer afterwards.

Ah! I missed that getting added in GCC 11. But yes, there it is:

https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html#index-malloc-function-attribute

Hah, now we may need to split __malloc from __alloc_size. ;)

I'd still like the NULL assignment behavior, though, since some things
can easily avoid static analysis.

-- 
Kees Cook