public inbox for gcc-bugs@sourceware.org help / color / mirror / Atom feed
From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug sanitizer/110676] [11/12/13/14 Regression] strlen of array[1] should not be optimized to 0 if using ASAN Date: Tue, 06 Feb 2024 12:00:53 +0000 [thread overview] Message-ID: <bug-110676-4-huSFwV4tFU@http.gcc.gnu.org/bugzilla/> (raw) In-Reply-To: <bug-110676-4@http.gcc.gnu.org/bugzilla/> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110676 --- Comment #6 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Jakub Jelinek <jakub@gcc.gnu.org>: https://gcc.gnu.org/g:d3eac7d96de790df51859f63c13838f153b416de commit r14-8825-gd3eac7d96de790df51859f63c13838f153b416de Author: Jakub Jelinek <jakub@redhat.com> Date: Tue Feb 6 13:00:04 2024 +0100 asan: Don't fold some strlens with -fsanitize=address [PR110676] The UB on the following testcase isn't diagnosed by -fsanitize=address, because we see that the array has a single element and optimize the strlen to 0. I think it is fine to assume e.g. for range purposes the lower bound for the strlen as long as we don't try to optimize strlen (str) where we know that it returns [26, 42] to 26 + strlen (str + 26), but for the upper bound we really want to punt on optimizing that for -fsanitize=address to read all the bytes of the string and diagnose if we run to object end etc. 2024-02-06 Jakub Jelinek <jakub@redhat.com> PR sanitizer/110676 * gimple-fold.cc (gimple_fold_builtin_strlen): For -fsanitize=address reset maxlen to sizetype maximum. * gcc.dg/asan/pr110676.c: New test.
next prev parent reply other threads:[~2024-02-06 12:00 UTC|newest] Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top 2023-07-15 18:28 [Bug sanitizer/110676] New: builtin optimization prevents ASan from detecting OOB reads nrk at disroot dot org 2023-07-15 18:32 ` [Bug sanitizer/110676] strlen of array[1] should not be optimized to 1 if using ASAN pinskia at gcc dot gnu.org 2023-07-15 18:35 ` [Bug sanitizer/110676] [11/12/13/14 Regression] " pinskia at gcc dot gnu.org 2023-07-15 18:35 ` nrk at disroot dot org 2024-02-05 20:23 ` [Bug sanitizer/110676] [11/12/13/14 Regression] strlen of array[1] should not be optimized to 0 " jakub at gcc dot gnu.org 2024-02-05 20:47 ` jakub at gcc dot gnu.org 2024-02-06 12:00 ` cvs-commit at gcc dot gnu.org [this message] 2024-02-06 12:01 ` [Bug sanitizer/110676] [11/12/13 " jakub at gcc dot gnu.org 2024-05-13 11:33 ` rguenth at gcc dot gnu.org
Reply instructions: You may reply publicly to this message via plain-text email using any one of the following methods: * Save the following mbox file, import it into your mail client, and reply-to-all from there: mbox Avoid top-posting and favor interleaved quoting: https://en.wikipedia.org/wiki/Posting_style#Interleaved_style * Reply using the --to, --cc, and --in-reply-to switches of git-send-email(1): git send-email \ --in-reply-to=bug-110676-4-huSFwV4tFU@http.gcc.gnu.org/bugzilla/ \ --to=gcc-bugzilla@gcc.gnu.org \ --cc=gcc-bugs@gcc.gnu.org \ /path/to/YOUR_REPLY https://kernel.org/pub/software/scm/git/docs/git-send-email.html * If your mail client supports setting the In-Reply-To header via mailto: links, try the mailto: linkBe sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions for how to clone and mirror all data and code used for this inbox; as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).