From: Linus Torvalds <torvalds@linux-foundation.org>
To: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Cc: Yann Droneaud <ydroneaud@opteya.com>,
David Laight <David.Laight@aculab.com>,
Joe Perches <joe@perches.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Jonathan Corbet <corbet@lwn.net>, Stephen Kitt <steve@sk2.org>,
Kees Cook <keescook@chromium.org>,
Nitin Gote <nitin.r.gote@intel.com>,
"jannh@google.com" <jannh@google.com>,
"kernel-hardening@lists.openwall.com"
<kernel-hardening@lists.openwall.com>,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [PATCH 1/2] string: Add stracpy and stracpy_pad mechanisms
Date: Wed, 24 Jul 2019 10:08:57 -0700 [thread overview]
Message-ID: <CAHk-=whPA-Vv-OHbUe4M5=ygTknQNOasnLAp-E3zSAaq=pue+g@mail.gmail.com> (raw)
In-Reply-To: <396d1eed-8edf-aa77-110b-c50ead3a5fd5@rasmusvillemoes.dk>
On Wed, Jul 24, 2019 at 6:09 AM Rasmus Villemoes
<linux@rasmusvillemoes.dk> wrote:
>
> The kernel's snprintf() does not behave in a non-standard way, at least
> not with respect to its return value.
Note that the kernels snprintf() *does* very much protect against the
overflow case - not by changing the return value, but simply by having
/* Reject out-of-range values early. Large positive sizes are
used for unknown buffer sizes. */
if (WARN_ON_ONCE(size > INT_MAX))
return 0;
at the very top.
So you can't actually overflow in the kernel by using the repeated
offset += vsnprintf( .. size - offset ..);
model.
Yes, it's the wrong thing to do, but it is still _safe_.
Linus
next prev parent reply other threads:[~2019-07-24 17:09 UTC|newest]
Thread overview: 82+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-23 0:38 [PATCH 0/2] string: Add stracpy and stracpy_pad Joe Perches
2019-07-23 0:38 ` [PATCH 1/2] string: Add stracpy and stracpy_pad mechanisms Joe Perches
2019-07-23 0:46 ` [Cocci] [Fwd: [PATCH 1/2] string: Add stracpy and stracpy_pad mechanisms] Joe Perches
2019-07-23 20:52 ` Julia Lawall
2019-07-23 20:52 ` [Cocci] " Julia Lawall
2019-07-23 23:42 ` Joe Perches
2019-07-23 23:42 ` [Cocci] " Joe Perches
2019-07-24 3:54 ` Julia Lawall
2019-07-24 3:54 ` [Cocci] " Julia Lawall
2019-07-24 4:19 ` Joe Perches
2019-07-24 4:19 ` [Cocci] " Joe Perches
2019-07-24 4:27 ` Julia Lawall
2019-07-24 4:27 ` [Cocci] " Julia Lawall
2019-07-24 4:37 ` Joe Perches
2019-07-24 4:37 ` [Cocci] " Joe Perches
2019-07-24 10:28 ` David Laight
2019-07-24 10:28 ` [Cocci] " David Laight
2019-07-24 10:43 ` Joe Perches
2019-07-24 10:43 ` [Cocci] " Joe Perches
2019-07-24 11:45 ` Julia Lawall
2019-07-24 11:45 ` [Cocci] " Julia Lawall
2019-07-25 1:42 ` Julia Lawall
2019-07-25 1:42 ` [Cocci] " Julia Lawall
2019-07-25 7:46 ` [PATCH 1/2] string: Add stracpy and stracpy_pad mechanisms Markus Elfring
2019-07-25 7:46 ` [Cocci] " Markus Elfring
2019-07-25 7:46 ` Markus Elfring
2019-07-25 11:34 ` Julia Lawall
2019-07-25 11:34 ` [Cocci] " Julia Lawall
2019-07-25 11:34 ` Julia Lawall
2019-07-25 12:40 ` [1/2] " Markus Elfring
2019-07-25 12:40 ` [Cocci] " Markus Elfring
2019-07-25 12:40 ` Markus Elfring
2019-07-25 13:45 ` [PATCH 1/2] " Markus Elfring
2019-07-25 13:45 ` [Cocci] " Markus Elfring
2019-07-25 13:45 ` Markus Elfring
2019-07-25 13:48 ` Julia Lawall
2019-07-25 13:48 ` [Cocci] " Julia Lawall
2019-07-25 13:48 ` Julia Lawall
2019-07-25 14:48 ` [1/2] " Markus Elfring
2019-07-25 14:48 ` [Cocci] " Markus Elfring
2019-07-25 14:48 ` Markus Elfring
2019-07-25 13:50 ` [Fwd: [PATCH 1/2] string: Add stracpy and stracpy_pad mechanisms] Joe Perches
2019-07-25 13:50 ` [Cocci] " Joe Perches
2019-07-25 13:58 ` Julia Lawall
2019-07-25 13:58 ` [Cocci] " Julia Lawall
2019-07-25 14:12 ` Joe Perches
2019-07-25 14:12 ` [Cocci] " Joe Perches
2019-07-25 22:51 ` Julia Lawall
2019-07-25 22:51 ` [Cocci] " Julia Lawall
2019-07-26 6:15 ` [1/2] string: Add stracpy and stracpy_pad mechanisms Markus Elfring
2019-07-26 6:15 ` [Cocci] " Markus Elfring
2019-07-26 6:15 ` Markus Elfring
2019-07-29 14:07 ` [Fwd: [PATCH 1/2] string: Add stracpy and stracpy_pad mechanisms] Julia Lawall
2019-07-29 14:07 ` [Cocci] " Julia Lawall
2019-07-29 16:28 ` Joe Perches
2019-07-29 16:28 ` [Cocci] " Joe Perches
2019-07-23 4:35 ` [PATCH 1/2] string: Add stracpy and stracpy_pad mechanisms Andrew Morton
2019-07-23 4:42 ` Joe Perches
2019-07-23 4:42 ` Joe Perches
2019-07-23 21:29 ` Kees Cook
2019-07-23 6:55 ` Rasmus Villemoes
2019-07-23 15:41 ` David Laight
2019-07-23 15:41 ` David Laight
2019-07-23 15:50 ` Joe Perches
2019-07-23 15:50 ` Joe Perches
2019-07-23 21:34 ` Kees Cook
2019-07-23 21:34 ` Kees Cook
2019-07-24 12:05 ` Yann Droneaud
2019-07-24 12:05 ` Yann Droneaud
2019-07-24 13:09 ` Rasmus Villemoes
2019-07-24 13:09 ` Rasmus Villemoes
2019-07-24 17:08 ` Linus Torvalds [this message]
2019-07-24 17:08 ` Linus Torvalds
2019-07-25 20:03 ` Kees Cook
2019-07-25 20:03 ` Kees Cook
2019-07-26 2:46 ` Joe Perches
2019-07-26 2:46 ` Joe Perches
2019-07-23 21:36 ` Kees Cook
2019-07-24 11:40 ` Joe Perches
2019-07-24 11:40 ` Joe Perches
2019-07-23 0:38 ` [PATCH 2/2] kernel-doc: core-api: Include string.h into core-api Joe Perches
2019-07-23 21:28 ` Kees Cook
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