the following patch was just integrated into master: commit e740f4845d72c688e1d4be9975987a376ef000fe Author: Aaron Durbin adurbin@chromium.org Date: Wed Jun 17 16:22:00 2015 +0200
util/cbmem: Fix out of bounds access
Building cbmem with ASan
$ CC=gcc-5 CFLAGS="-O1 -g -fsanitize=address -fno-omit-frame-pointer" LDFLAGS="-fsanitize=address" make
it sometimes finds a heap-buffer-overflow, while dumping the CBMEM console.
$ sudo ./cbmem -c ================================================================= ==11208==ERROR: AddressSanitizer: heap-buffer-overflow on address 0xb5d5782b at pc 0x0804a4d7 bp 0xbfe23bc8 sp 0xbfe23bbc WRITE of size 1 at 0xb5d5782b thread T0 #0 0x804a4d6 in dump_console /home/joey/src/coreboot/util/cbmem/cbmem.c:553 #1 0x804a4d6 in main /home/joey/src/coreboot/util/cbmem/cbmem.c:1134 #2 0xb70a3a62 in __libc_start_main (/lib/i386-linux-gnu/i686/cmov/libc.so.6+0x19a62) #3 0x8048cf0 (/home/joey/src/coreboot/util/cbmem/cbmem+0x8048cf0)
0xb5d5782b is located 50 bytes to the right of 131065-byte region [0xb5d37800,0xb5d577f9) allocated by thread T0 here: #0 0xb72c64ce in __interceptor_malloc (/usr/lib/i386-linux-gnu/libasan.so.2+0x924ce) #1 0x804a407 in dump_console /home/joey/src/coreboot/util/cbmem/cbmem.c:542 #2 0x804a407 in main /home/joey/src/coreboot/util/cbmem/cbmem.c:1134 #3 0xb70a3a62 in __libc_start_main (/lib/i386-linux-gnu/i686/cmov/libc.so.6+0x19a62)
SUMMARY: AddressSanitizer: heap-buffer-overflow /home/joey/src/coreboot/util/cbmem/cbmem.c:553 dump_console Shadow bytes around the buggy address: 0x36baaeb0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x36baaec0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x36baaed0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x36baaee0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x36baaef0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 01 =>0x36baaf00: fa fa fa fa fa[fa]fa fa fa fa fa fa fa fa fa fa 0x36baaf10: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x36baaf20: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x36baaf30: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x36baaf40: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x36baaf50: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 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 Heap right redzone: fb Freed heap region: fd Stack left redzone: f1 Stack mid redzone: f2 Stack right redzone: f3 Stack partial redzone: f4 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 ==11208==ABORTING
Fix up commit 06b13a37 (cbmem: Terminate the cbmem console at the cursor position.) by reverting setting the cursor to 0.
Change-Id: Id614a8e0f1a202671dd091f825d826a17176bfcc Signed-off-by: Aaron Durbin adurbin@chromium.org Signed-off-by: Paul Menzel paulepanter@users.sourceforge.net Reviewed-on: http://review.coreboot.org/10572 Tested-by: build bot (Jenkins) Reviewed-by: Martin Roth martinroth@google.com
See http://review.coreboot.org/10572 for details.
-gerrit