[Bug middle-end/92942] missing -Wstringop-overflow for allocations with a negative lower bound size
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92942 Martin Sebor 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 --- 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); | ^~
[Bug middle-end/92942] missing -Wstringop-overflow for allocations with a negative lower bound size
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92942 --- Comment #3 from CVS Commits --- The master branch has been updated by Martin Sebor : https://gcc.gnu.org/g:c0b09c1296d5334d1d264ba4d39ca932f9572330 commit r11-4441-gc0b09c1296d5334d1d264ba4d39ca932f9572330 Author: Martin Sebor 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.
[Bug middle-end/92942] missing -Wstringop-overflow for allocations with a negative lower bound size
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92942 Martin Sebor changed: What|Removed |Added Keywords||patch --- Comment #2 from Martin Sebor --- Patch: https://gcc.gnu.org/pipermail/gcc-patches/2020-August/552903.html
[Bug middle-end/92942] missing -Wstringop-overflow for allocations with a negative lower bound size
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92942 Martin Sebor 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 --- Testing a fix.
