From: David Laight <David.Laight@ACULAB.COM>
To: 'Kees Cook' <keescook@chromium.org>,
Linus Torvalds <torvalds@linux-foundation.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>,
Florian Weimer <fweimer@redhat.com>,
Andrew Morton <akpm@linux-foundation.org>,
Josh Poimboeuf <jpoimboe@redhat.com>,
Rasmus Villemoes <linux@rasmusvillemoes.dk>,
"Randy Dunlap" <rdunlap@infradead.org>,
Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>,
Ingo Molnar <mingo@kernel.org>, Ian Abbott <abbotti@mev.co.uk>,
linux-input <linux-input@vger.kernel.org>,
linux-btrfs <linux-btrfs@vger.kernel.org>,
Network Development <netdev@vger.kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Kernel Hardening <kernel-hardening@lists.openwall.com>
Subject: RE: [PATCH v5 0/2] Remove false-positive VLAs when using max()
Date: Thu, 22 Mar 2018 15:13:10 +0000 [thread overview]
Message-ID: <6057c50c19d94174814e90503caa0aa5@AcuMS.aculab.com> (raw)
In-Reply-To: <CAGXu5j+5i+56R0KDLMDA=+_DRW5w9aUGCEo0dq6PZvHPBWkM1g@mail.gmail.com>
From: Kees Cook
> Sent: 22 March 2018 15:01
...
> > /* Glory to Martin Uecker <Martin.Uecker@med.uni-goettingen.de> */
> > #define __is_constant(a) \
> > (sizeof(int) == sizeof(*(1 ? ((void*)((a) * 0l)) : (int*)1)))
...
> So, this time it's not a catastrophic failure with gcc 4.4. Instead it
> fails in 11 distinct places:
...
> Seems like it doesn't like void * arguments:
>
> mm/percpu.c:
> void *ptr;
> ...
> base = min(ptr, base);
Try adding (unsigned long) before the (a).
David
next prev parent reply other threads:[~2018-03-22 15:13 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-16 4:25 Kees Cook
2018-03-16 4:25 ` [PATCH v5 1/2] kernel.h: Introduce const_max_t() for VLA removal Kees Cook
2018-03-16 4:25 ` [PATCH v5 2/2] Remove false-positive VLAs when using max() Kees Cook
2018-03-19 10:45 ` Andrey Ryabinin
2018-03-16 11:47 ` [PATCH v5 0/2] " Florian Weimer
2018-03-16 17:29 ` Linus Torvalds
2018-03-16 17:32 ` Florian Weimer
2018-03-16 17:44 ` David Laight
2018-03-16 20:25 ` Linus Torvalds
2018-03-16 17:55 ` Al Viro
2018-03-16 18:14 ` Al Viro
2018-03-16 19:27 ` Linus Torvalds
2018-03-16 20:03 ` Miguel Ojeda
2018-03-16 20:14 ` Linus Torvalds
2018-03-16 20:19 ` Linus Torvalds
2018-03-17 0:48 ` Miguel Ojeda
2018-03-17 1:49 ` Miguel Ojeda
2018-03-16 20:12 ` Al Viro
2018-03-16 20:15 ` Linus Torvalds
2018-03-16 20:18 ` Al Viro
2018-03-17 7:27 ` Kees Cook
2018-03-17 18:52 ` Linus Torvalds
2018-03-17 20:07 ` Kees Cook
2018-03-17 22:55 ` Josh Poimboeuf
2018-03-20 23:23 ` Linus Torvalds
2018-03-20 23:26 ` Linus Torvalds
2018-03-21 0:05 ` Al Viro
2018-03-22 15:01 ` Kees Cook
2018-03-22 15:13 ` David Laight [this message]
2018-03-22 17:04 ` Linus Torvalds
2018-03-18 21:13 ` Rasmus Villemoes
2018-03-18 21:33 ` Linus Torvalds
2018-03-18 22:59 ` Rasmus Villemoes
2018-03-18 23:36 ` Linus Torvalds
2018-03-19 9:43 ` David Laight
2018-03-19 23:29 ` Linus Torvalds
2018-03-20 3:10 ` Arnd Bergmann
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