https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111738
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |INVALID
Status|UNCONFIRMED |RESOLVED
--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
=================================================================
==1==ERROR: AddressSanitizer: global-buffer-overflow on address 0x0000004043e0
at pc 0x0000004012a3 bp 0x7ffd3315e4b0 sp 0x7ffd3315e4a8
WRITE of size 8 at 0x0000004043e0 thread T0
#0 0x4012a2 in i (/app/output.s+0x4012a2) (BuildId:
4eb338bebafc71b3519003fd1b76487cfb8fb27b)
#1 0x4011c3 in h (/app/output.s+0x4011c3) (BuildId:
4eb338bebafc71b3519003fd1b76487cfb8fb27b)
#2 0x40146f in main (/app/output.s+0x40146f) (BuildId:
4eb338bebafc71b3519003fd1b76487cfb8fb27b)
#3 0x7f28b75e2082 in __libc_start_main
(/lib/x86_64-linux-gnu/libc.so.6+0x24082) (BuildId:
1878e6b475720c7c51969e69ab2d276fae6d1dee)
#4 0x4010fd in _start (/app/output.s+0x4010fd) (BuildId:
4eb338bebafc71b3519003fd1b76487cfb8fb27b)
0x0000004043e4 is located 0 bytes after global variable 'b' defined in
'/app/example.cpp:1:8' (0x4043e0) of size 4
SUMMARY: AddressSanitizer: global-buffer-overflow (/app/output.s+0x4012a2)
(BuildId: 4eb338bebafc71b3519003fd1b76487cfb8fb27b) in i
Shadow bytes around the buggy address:
0x000000404100: 00 f9 f9 f9 f9 f9 f9 f9 00 00 00 00 00 00 00 00
0x000000404180: 00 00 00 00 00 00 00 00 f9 f9 f9 f9 f9 f9 f9 f9
0x000000404200: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
0x000000404280: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
0x000000404300: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
=>0x000000404380: f9 f9 f9 f9 f9 f9 f9 f9 00 00 00 00[04]f9 f9 f9
0x000000404400: f9 f9 f9 f9 04 f9 f9 f9 f9 f9 f9 f9 04 f9 f9 f9
0x000000404480: f9 f9 f9 f9 04 f9 f9 f9 f9 f9 f9 f9 00 00 00 00
0x000000404500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x000000404580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x000000404600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
Shadow byte legend (one shadow byte represents 8 application bytes):
Addressable: 00
Partially addressable: 01 02 03 04 05 06 07
Heap left redzone: fa
Freed heap region: fd
Stack left redzone: f1
Stack mid redzone: f2
Stack right redzone: f3
Stack after return: f5
Stack use after scope: f8
Global redzone: f9
Global init order: f6
Poisoned by user: f7
Container overflow: fc
Array cookie: ac
Intra object redzone: bb
ASan internal: fe
Left alloca redzone: ca
Right alloca redzone: cb
==1==ABORTING
In this case:
```
**c = &b;
```
...
int **k = &b;
*k = &j;
*g |= **c;
```
Basically once I fixed the size issue (or use -m32) there is profile
difference.
