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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug sanitizer/109446] Possible destination array overflow without diagnosis in memcpy
Date: Wed, 12 Apr 2023 08:46:18 +0000 [thread overview]
Message-ID: <bug-109446-4-6bhI13QkNj@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-109446-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109446
--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Martin Liška from comment #5)
> > It seems Clang disables this optimization and convert memcpy to
> > __asan_memcpy calls if -fsanitize=address used:
> >
> > https://godbolt.org/z/dcfadoMYY
>
> Yep! Richi, do you know a place where we lower this?
gimple_fold_builtin_memory_op
not sure if we should prevent all of those transforms. But the question is
why ASAN doesn't instrument the generated aggregate copy? Maybe because
in C/C++ you cannot write an aggregate array copy?
next prev parent reply other threads:[~2023-04-12 8:46 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-04-07 15:47 [Bug sanitizer/109446] New: " mohamed.selim at dxc dot com
2023-04-11 11:02 ` [Bug sanitizer/109446] " mohamed.selim at dxc dot com
2023-04-11 13:33 ` xry111 at gcc dot gnu.org
2023-04-12 8:05 ` marxin at gcc dot gnu.org
2023-04-12 8:08 ` xry111 at gcc dot gnu.org
2023-04-12 8:10 ` marxin at gcc dot gnu.org
2023-04-12 8:46 ` rguenth at gcc dot gnu.org [this message]
2023-04-12 8:52 ` jakub at gcc dot gnu.org
2023-04-12 8:59 ` rguenth at gcc dot gnu.org
2023-04-12 9:01 ` marxin at gcc dot gnu.org
2023-04-12 9:04 ` pinskia at gcc dot gnu.org
2023-04-12 9:07 ` marxin at gcc dot gnu.org
2023-04-12 9:18 ` rguenther at suse dot de
2023-04-12 11:16 ` xry111 at gcc dot gnu.org
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