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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
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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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