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* [Bug middle-end/92942] missing -Wstringop-overflow for allocations with a negative lower bound size [not found] <bug-92942-4@http.gcc.gnu.org/bugzilla/> @ 2020-08-27 18:52 ` msebor at gcc dot gnu.org 2020-09-09 21:46 ` msebor at gcc dot gnu.org ` (2 subsequent siblings) 3 siblings, 0 replies; 4+ messages in thread From: msebor at gcc dot gnu.org @ 2020-08-27 18:52 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92942 Martin Sebor <msebor at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |ASSIGNED Last reconfirmed| |2020-08-27 Ever confirmed|0 |1 Assignee|unassigned at gcc dot gnu.org |msebor at gcc dot gnu.org --- Comment #1 from Martin Sebor <msebor at gcc dot gnu.org> --- Testing a fix. ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug middle-end/92942] missing -Wstringop-overflow for allocations with a negative lower bound size [not found] <bug-92942-4@http.gcc.gnu.org/bugzilla/> 2020-08-27 18:52 ` [Bug middle-end/92942] missing -Wstringop-overflow for allocations with a negative lower bound size msebor at gcc dot gnu.org @ 2020-09-09 21:46 ` msebor at gcc dot gnu.org 2020-10-27 14:34 ` cvs-commit at gcc dot gnu.org 2020-10-27 14:37 ` msebor at gcc dot gnu.org 3 siblings, 0 replies; 4+ messages in thread From: msebor at gcc dot gnu.org @ 2020-09-09 21:46 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92942 Martin Sebor <msebor at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Keywords| |patch --- Comment #2 from Martin Sebor <msebor at gcc dot gnu.org> --- Patch: https://gcc.gnu.org/pipermail/gcc-patches/2020-August/552903.html ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug middle-end/92942] missing -Wstringop-overflow for allocations with a negative lower bound size [not found] <bug-92942-4@http.gcc.gnu.org/bugzilla/> 2020-08-27 18:52 ` [Bug middle-end/92942] missing -Wstringop-overflow for allocations with a negative lower bound size msebor at gcc dot gnu.org 2020-09-09 21:46 ` msebor at gcc dot gnu.org @ 2020-10-27 14:34 ` cvs-commit at gcc dot gnu.org 2020-10-27 14:37 ` msebor at gcc dot gnu.org 3 siblings, 0 replies; 4+ messages in thread From: cvs-commit at gcc dot gnu.org @ 2020-10-27 14:34 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92942 --- Comment #3 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Martin Sebor <msebor@gcc.gnu.org>: https://gcc.gnu.org/g:c0b09c1296d5334d1d264ba4d39ca932f9572330 commit r11-4441-gc0b09c1296d5334d1d264ba4d39ca932f9572330 Author: Martin Sebor <msebor@redhat.com> Date: Tue Oct 27 08:31:53 2020 -0600 Add tests for PR92942 - missing -Wstringop-overflow for allocations with a negative lower bound size. gcc/testsuite/ChangeLog: PR middle-end/92942 * gcc.dg/Wstringop-overflow-56.c: New test. * gcc.dg/Wstringop-overflow-57.c: Same. ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug middle-end/92942] missing -Wstringop-overflow for allocations with a negative lower bound size [not found] <bug-92942-4@http.gcc.gnu.org/bugzilla/> ` (2 preceding siblings ...) 2020-10-27 14:34 ` cvs-commit at gcc dot gnu.org @ 2020-10-27 14:37 ` msebor at gcc dot gnu.org 3 siblings, 0 replies; 4+ messages in thread From: msebor at gcc dot gnu.org @ 2020-10-27 14:37 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92942 Martin Sebor <msebor at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Resolution|--- |FIXED Target Milestone|--- |11.0 See Also| |https://gcc.gnu.org/bugzill | |a/show_bug.cgi?id=97342 Status|ASSIGNED |RESOLVED --- Comment #4 from Martin Sebor <msebor at gcc dot gnu.org> --- The patch referenced in comment #2 was never reviewed but the bug was resolved by the improvements to compute_objsize() committed as part of the fix for pr97342. GCC 11 detects both buffer overflows: $ gcc -O2 -S -Wall pr92942.c pr92942.c: In function ‘f’: pr92942.c:10:3: warning: ‘__builtin_memcpy’ writing 6 bytes into a region of size between 0 and 3 [-Wstringop-overflow=] 10 | strcpy (p, "12345"); // buffer overflow detected | ^~~~~~~~~~~~~~~~~~~ pr92942.c:9:13: note: at offset 0 to an object with size at most 3 allocated by ‘malloc’ here 9 | void *p = malloc (n); | ^~~~~~~~~~ pr92942.c: In function ‘g’: pr92942.c:20:3: warning: ‘__builtin_memcpy’ writing 6 bytes into a region of size between 0 and 3 [-Wstringop-overflow=] 20 | strcpy (p, "12345"); // buffer overflow not detected | ^~~~~~~~~~~~~~~~~~~ pr92942.c:19:13: note: at offset 0 to an object with size at most 3 allocated by ‘malloc’ here 19 | void *p = malloc (n); | ^~~~~~~~~~ ^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2020-10-27 14:37 UTC | newest] Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- [not found] <bug-92942-4@http.gcc.gnu.org/bugzilla/> 2020-08-27 18:52 ` [Bug middle-end/92942] missing -Wstringop-overflow for allocations with a negative lower bound size msebor at gcc dot gnu.org 2020-09-09 21:46 ` msebor at gcc dot gnu.org 2020-10-27 14:34 ` cvs-commit at gcc dot gnu.org 2020-10-27 14:37 ` msebor at gcc dot gnu.org
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