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* [Bug middle-end/48558] New: -Warray-bounds fails o detect the out of bound array access
@ 2011-04-11 18:24 hjl.tools at gmail dot com
2011-04-11 18:40 ` [Bug middle-end/48558] -Warray-bounds fails to " hjl.tools at gmail dot com
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: hjl.tools at gmail dot com @ 2011-04-11 18:24 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48558
Summary: -Warray-bounds fails o detect the out of bound array
access
Product: gcc
Version: 4.7.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: middle-end
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: hjl.tools@gmail.com
bfd/elf32-i386.c in binutils has
case BFD_RELOC_386_IRELATIVE:
TRACE ("BFD_RELOC_386_IRELATIVE");
return &elf_howto_table[R_386_IRELATIVE];
It should be:
return &elf_howto_table[R_386_IRELATIVE - R_386_tls_offset];
GCC fails to detect it.
^ permalink raw reply [flat|nested] 4+ messages in thread* [Bug middle-end/48558] -Warray-bounds fails to detect the out of bound array access 2011-04-11 18:24 [Bug middle-end/48558] New: -Warray-bounds fails o detect the out of bound array access hjl.tools at gmail dot com @ 2011-04-11 18:40 ` hjl.tools at gmail dot com 2011-04-11 19:10 ` hjl.tools at gmail dot com 2011-04-12 10:28 ` rguenth at gcc dot gnu.org 2 siblings, 0 replies; 4+ messages in thread From: hjl.tools at gmail dot com @ 2011-04-11 18:40 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48558 --- Comment #1 from H.J. Lu <hjl.tools at gmail dot com> 2011-04-11 18:40:07 UTC --- A testcase: [hjl@gnu-6 bfd]$ cat x.c enum bfd_reloc_code_real { BFD_RELOC_386_IRELATIVE }; typedef enum bfd_reloc_code_real bfd_reloc_code_real_type; typedef const struct reloc_howto_struct reloc_howto_type; struct reloc_howto_struct { unsigned int type; }; enum elf_i386_reloc_type { R_386_IRELATIVE = 42, }; static reloc_howto_type elf_howto_table[]= { { (unsigned) R_386_IRELATIVE } }; reloc_howto_type * elf_i386_reloc_type_lookup (bfd_reloc_code_real_type code) { switch (code) { case BFD_RELOC_386_IRELATIVE: return &elf_howto_table[R_386_IRELATIVE]; default: break; } return 0; } [hjl@gnu-6 bfd]$ /usr/gcc-4.7.0-x32/bin/gcc -O3 -S -Wall x.c -Warray-bounds [hjl@gnu-6 bfd]$ ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug middle-end/48558] -Warray-bounds fails to detect the out of bound array access 2011-04-11 18:24 [Bug middle-end/48558] New: -Warray-bounds fails o detect the out of bound array access hjl.tools at gmail dot com 2011-04-11 18:40 ` [Bug middle-end/48558] -Warray-bounds fails to " hjl.tools at gmail dot com @ 2011-04-11 19:10 ` hjl.tools at gmail dot com 2011-04-12 10:28 ` rguenth at gcc dot gnu.org 2 siblings, 0 replies; 4+ messages in thread From: hjl.tools at gmail dot com @ 2011-04-11 19:10 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48558 --- Comment #2 from H.J. Lu <hjl.tools at gmail dot com> 2011-04-11 19:09:54 UTC --- A simple change from return &elf_howto_table[R_386_IRELATIVE]; to return elf_howto_table[R_386_IRELATIVE]; makes GCC to warn: [hjl@gnu-6 bfd]$ cat x.c enum bfd_reloc_code_real { BFD_RELOC_386_IRELATIVE }; typedef enum bfd_reloc_code_real bfd_reloc_code_real_type; typedef const struct reloc_howto_struct reloc_howto_type; struct reloc_howto_struct { unsigned int type; }; enum elf_i386_reloc_type { R_386_IRELATIVE = 42, }; static reloc_howto_type elf_howto_table[]= { { (unsigned) R_386_IRELATIVE } }; reloc_howto_type elf_i386_reloc_type_lookup (bfd_reloc_code_real_type code) { switch (code) { case BFD_RELOC_386_IRELATIVE: return elf_howto_table[R_386_IRELATIVE]; default: break; } return elf_howto_table[0]; } [hjl@gnu-6 bfd]$ /usr/gcc-4.7.0-x32/bin/gcc -O3 -S -Wall x.c -Warray-bounds x.c: In function ‘elf_i386_reloc_type_lookup’: x.c:25:29: warning: array subscript is above array bounds [-Warray-bounds] [hjl@gnu-6 bfd]$ ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug middle-end/48558] -Warray-bounds fails to detect the out of bound array access 2011-04-11 18:24 [Bug middle-end/48558] New: -Warray-bounds fails o detect the out of bound array access hjl.tools at gmail dot com 2011-04-11 18:40 ` [Bug middle-end/48558] -Warray-bounds fails to " hjl.tools at gmail dot com 2011-04-11 19:10 ` hjl.tools at gmail dot com @ 2011-04-12 10:28 ` rguenth at gcc dot gnu.org 2 siblings, 0 replies; 4+ messages in thread From: rguenth at gcc dot gnu.org @ 2011-04-12 10:28 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48558 Richard Guenther <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Keywords| |diagnostic Status|UNCONFIRMED |NEW Last reconfirmed| |2011.04.12 10:28:18 Ever Confirmed|0 |1 Severity|normal |enhancement --- Comment #3 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-04-12 10:28:18 UTC --- Confirmed. ^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2011-04-12 10:28 UTC | newest] Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2011-04-11 18:24 [Bug middle-end/48558] New: -Warray-bounds fails o detect the out of bound array access hjl.tools at gmail dot com 2011-04-11 18:40 ` [Bug middle-end/48558] -Warray-bounds fails to " hjl.tools at gmail dot com 2011-04-11 19:10 ` hjl.tools at gmail dot com 2011-04-12 10:28 ` rguenth at gcc dot gnu.org
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