linux-kernel - Re: SLUB: Return ZERO_SIZE

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Mon, 4 Jun 2007 19:37:01 +0300
From:	"Pekka Enberg" <penberg@...helsinki.fi>
To:	"Linus Torvalds" <torvalds@...ux-foundation.org>
Cc:	"Christoph Lameter" <clameter@....com>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, jeremy@...p.org
Subject: Re: SLUB: Return ZERO_SIZE_PTR for kmalloc(0)

On 6/4/07, Linus Torvalds <torvalds@...ux-foundation.org> wrote:
> Well, the red-zones won't catch readers, and more importantly, even for
> writers they are *really* inconvenient, because it will just tell you
> something bad happened, it won't tell you *where* it happened.

True.

On 6/4/07, Linus Torvalds <torvalds@...ux-foundation.org> wrote:
> Since comparing the addresses of two zero-sized allocations is insane and
> not done _anyway_, it's just much better to return an invalid address.

Then we might as well return your regular NULL pointer for zero-length
allocations as you can't do anything sane with ZERO_SIZE_PTR either.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/