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From: "joseph at codesourcery dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug libc/25620] Signed comparison vulnerability in the ARMv7 memcpy() (CVE-2020-6096)
Date: Tue, 07 Apr 2020 20:58:48 +0000 [thread overview]
Message-ID: <bug-25620-131-7zPFGZAmEy@http.sourceware.org/bugzilla/> (raw)
In-Reply-To: <bug-25620-131@http.sourceware.org/bugzilla/>
https://sourceware.org/bugzilla/show_bug.cgi?id=25620
--- Comment #14 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
On Tue, 7 Apr 2020, wdijkstr at arm dot com via Glibc-bugs wrote:
> Yes, and it would be even better to check for overlap, that includes this case
> and would find quite a few real bugs.
I think a de facto part of the ABI is that memcpy of an object to itself
(source and destination pointers equal) does work; some GCC versions may
generate that for structure assignment in some cases where it's not know
if there might be such exact overlap but partial overlap would not be
valid (which is the standard C rule for structure assignment). (GCC won't
let you declare a type occupying half the address space or more, so the
structure assignment case isn't applicable for such a large memcpy.)
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next prev parent reply other threads:[~2020-04-07 20:58 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <bug-25620-131@http.sourceware.org/bugzilla/>
2020-03-16 18:59 ` [Bug libc/25620] ### Summary An exploitable signed comparison vulnerability exists in the ARMv7 memcpy() implementation of GNU glibc. Calling memcpy() (on ARMv7 targets that utilize the GNU glibc implementation) with a negative value for the 'num' parameter results in a sourceware at 1936 dot ca
2020-03-16 20:19 ` [Bug libc/25620] Signed comparison vulnerability in the ARMv7 memcpy() carlos at redhat dot com
2020-03-16 20:32 ` adhemerval.zanella at linaro dot org
2020-03-26 14:24 ` regiwils at cisco dot com
2020-03-28 2:36 ` [Bug libc/25620] Signed comparison vulnerability in the ARMv7 memcpy() (CVE-2020-6096) carlos at redhat dot com
2020-03-30 13:08 ` regiwils at cisco dot com
2020-04-02 15:24 ` carnil at debian dot org
2020-04-06 10:27 ` rearnsha at gcc dot gnu.org
2020-04-07 13:15 ` carlos at redhat dot com
2020-04-07 17:47 ` wdijkstr at arm dot com
2020-04-07 18:07 ` fweimer at redhat dot com
2020-04-07 18:50 ` wdijkstr at arm dot com
2020-04-07 20:49 ` carlos at redhat dot com
2020-04-07 20:58 ` joseph at codesourcery dot com [this message]
2020-04-08 13:34 ` nsz at gcc dot gnu.org
2020-04-08 14:09 ` wdijkstr at arm dot com
2020-04-21 14:35 ` carlos at redhat dot com
2020-04-21 14:41 ` carlos at redhat dot com
2020-05-01 13:03 ` wdijkstr at arm dot com
2020-05-01 13:28 ` regiwils at cisco dot com
2020-05-01 13:35 ` carlos at redhat dot com
2020-05-01 13:42 ` regiwils at cisco dot com
2020-05-01 15:51 ` regiwils at cisco dot com
2020-05-01 20:28 ` carlos at redhat dot com
2020-05-12 17:03 ` cvs-commit at gcc dot gnu.org
2020-05-13 14:48 ` cvs-commit at gcc dot gnu.org
2020-07-08 12:22 ` fweimer at redhat dot com
2020-07-08 16:46 ` jsm28 at gcc dot gnu.org
2020-07-16 4:57 ` cvs-commit at gcc dot gnu.org
2020-07-17 18:56 ` regiwils at cisco dot com
2020-07-17 21:24 ` carlos at redhat dot com
2021-03-19 1:31 ` oliveandnini at gmail dot com
2021-06-02 4:54 ` alucca388 at gmail dot com
2021-10-04 15:12 ` aricjoshua44 at gmail dot com
2021-11-03 9:11 ` boardgamesaz at gmail dot com
2021-11-03 9:12 ` boardgamesaz at gmail dot com
2021-11-21 15:46 ` ellasofia253 at gmail dot com
2022-11-02 2:35 ` boardgamesaz at gmail dot com
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