Murray McAllister of the Red Hat Security Response Team reported the following potential vulnerability in potrace:
There is a possible issue in potrace-1.11-1.fc18.x86_64. The attached
bmp file (1.bmp) triggers it. I suspect less memory is allocated than
expected in bm_new() due to integer overflow. I have not investigated it
closely or the rest of the application yet.
==2042== Memcheck, a memory error detector
==2042== Copyright (C) 2002-2012, and GNU GPL'd, by Julian Seward et al.
==2042== Using Valgrind-3.8.1 and LibVEX; rerun with -h for copyright info
==2042== Command: potrace 1.bmp
==2042==
==2042== Invalid read of size 8
==2042== at 0x405F2D: bm_read (bitmap_io.c:615)
==2042== by 0x4035A0: process_file.isra.3 (main.c:1056)
==2042== by 0x402C9E: main (main.c:1212)
==2042== Address 0x4c14680 is 0 bytes after a block of size 0 alloc'd
==2042== at 0x4A0887C: malloc (vg_replace_malloc.c:270)
==2042== by 0x405069: bm_read (bitmap.h:66)
==2042== by 0x4035A0: process_file.isra.3 (main.c:1056)
==2042== by 0x402C9E: main (main.c:1212)
==2042==
==2042== Invalid write of size 8
==2042== at 0x405F31: bm_read (bitmap_io.c:615)
==2042== by 0x4035A0: process_file.isra.3 (main.c:1056)
==2042== by 0x402C9E: main (main.c:1212)
==2042== Address 0x4c14680 is 0 bytes after a block of size 0 alloc'd
==2042== at 0x4A0887C: malloc (vg_replace_malloc.c:270)
==2042== by 0x405069: bm_read (bitmap.h:66)
==2042== by 0x4035A0: process_file.isra.3 (main.c:1056)
==2042== by 0x402C9E: main (main.c:1212)
==2042==
==2042== Invalid read of size 8
==2042== at 0x405585: bm_read (bitmap_io.c:615)
==2042== by 0x4035A0: process_file.isra.3 (main.c:1056)
==2042== by 0x402C9E: main (main.c:1212)
==2042== Address 0x4c14688 is 8 bytes after a block of size 0 alloc'd
==2042== at 0x4A0887C: malloc (vg_replace_malloc.c:270)
==2042== by 0x405069: bm_read (bitmap.h:66)
==2042== by 0x4035A0: process_file.isra.3 (main.c:1056)
==2042== by 0x402C9E: main (main.c:1212)
==2042==
==2042== Invalid write of size 8
==2042== at 0x405589: bm_read (bitmap_io.c:615)
==2042== by 0x4035A0: process_file.isra.3 (main.c:1056)
==2042== by 0x402C9E: main (main.c:1212)
==2042== Address 0x4c14688 is 8 bytes after a block of size 0 alloc'd
==2042== at 0x4A0887C: malloc (vg_replace_malloc.c:270)
==2042== by 0x405069: bm_read (bitmap.h:66)
==2042== by 0x4035A0: process_file.isra.3 (main.c:1056)
==2042== by 0x402C9E: main (main.c:1212)
==2042==
potrace: warning: 1.bmp: premature end of file
valgrind: m_mallocfree.c:268 (mk_plain_bszB): Assertion 'bszB != 0' failed.
valgrind: This is probably caused by your program erroneously writing
past the
end of a heap block and corrupting heap metadata. If you fix any
invalid writes reported by Memcheck, this assertion failure will
probably go away. Please try that before reporting this as a bug.
==2042== at 0x38057AAF: report_and_quit (m_libcassert.c:235)
==2042== by 0x38057BF2: vgPlain_assert_fail (m_libcassert.c:309)
==2042== by 0x380009EC: mk_plain_bszB.part.5 (m_mallocfree.c:268)
==2042== by 0x38063C87: vgPlain_arena_malloc (m_mallocfree.c:1563)
==2042== by 0x380299A4: vgMemCheck_new_block (mc_malloc_wrappers.c:263)
==2042== by 0x38029B3A: vgMemCheck_malloc (mc_malloc_wrappers.c:301)
==2042== by 0x3809E490: vgPlain_scheduler (scheduler.c:1667)
==2042== by 0x380AD6F9: run_a_thread_NORETURN (syswrap-linux.c:103)
sched status:
running_tid=1
Thread 1: status = VgTs_Runnable
==2042== at 0x4A0887C: malloc (vg_replace_malloc.c:270)
==2042== by 0x354AE062B0: potrace_trace (potracelib.c:68)
==2042== by 0x40361A: process_file.isra.3 (main.c:1100)
==2042== by 0x402C9E: main (main.c:1212)
Murray McAllister of the Red Hat Security Response Team reported the following potential vulnerability in potrace:
There is a possible issue in potrace- 1.11-1. fc18.x86_ 64. The attached
bmp file (1.bmp) triggers it. I suspect less memory is allocated than
expected in bm_new() due to integer overflow. I have not investigated it
closely or the rest of the application yet.
$ potrace 1.bmp libc.so. 6[0x3c6de7ca8e] libpotrace. so.0[0x354ae061 2f] libpotrace. so.0(potrace_ trace+0x106) [0x354ae06356] libc.so. 6(__libc_ start_main+ 0xf5)[0x3c6de21 a05]
*** glibc detected *** potrace: free(): invalid next size (fast):
0x0000000001263580 ***
======= Backtrace: =========
/usr/lib64/
/usr/lib64/
/usr/lib64/
potrace[0x40361b]
potrace[0x402c9f]
/usr/lib64/
potrace[0x40303d]
..
==2042== Memcheck, a memory error detector malloc. c:270) malloc. c:270) malloc. c:270) malloc. c:270)
==2042== Copyright (C) 2002-2012, and GNU GPL'd, by Julian Seward et al.
==2042== Using Valgrind-3.8.1 and LibVEX; rerun with -h for copyright info
==2042== Command: potrace 1.bmp
==2042==
==2042== Invalid read of size 8
==2042== at 0x405F2D: bm_read (bitmap_io.c:615)
==2042== by 0x4035A0: process_file.isra.3 (main.c:1056)
==2042== by 0x402C9E: main (main.c:1212)
==2042== Address 0x4c14680 is 0 bytes after a block of size 0 alloc'd
==2042== at 0x4A0887C: malloc (vg_replace_
==2042== by 0x405069: bm_read (bitmap.h:66)
==2042== by 0x4035A0: process_file.isra.3 (main.c:1056)
==2042== by 0x402C9E: main (main.c:1212)
==2042==
==2042== Invalid write of size 8
==2042== at 0x405F31: bm_read (bitmap_io.c:615)
==2042== by 0x4035A0: process_file.isra.3 (main.c:1056)
==2042== by 0x402C9E: main (main.c:1212)
==2042== Address 0x4c14680 is 0 bytes after a block of size 0 alloc'd
==2042== at 0x4A0887C: malloc (vg_replace_
==2042== by 0x405069: bm_read (bitmap.h:66)
==2042== by 0x4035A0: process_file.isra.3 (main.c:1056)
==2042== by 0x402C9E: main (main.c:1212)
==2042==
==2042== Invalid read of size 8
==2042== at 0x405585: bm_read (bitmap_io.c:615)
==2042== by 0x4035A0: process_file.isra.3 (main.c:1056)
==2042== by 0x402C9E: main (main.c:1212)
==2042== Address 0x4c14688 is 8 bytes after a block of size 0 alloc'd
==2042== at 0x4A0887C: malloc (vg_replace_
==2042== by 0x405069: bm_read (bitmap.h:66)
==2042== by 0x4035A0: process_file.isra.3 (main.c:1056)
==2042== by 0x402C9E: main (main.c:1212)
==2042==
==2042== Invalid write of size 8
==2042== at 0x405589: bm_read (bitmap_io.c:615)
==2042== by 0x4035A0: process_file.isra.3 (main.c:1056)
==2042== by 0x402C9E: main (main.c:1212)
==2042== Address 0x4c14688 is 8 bytes after a block of size 0 alloc'd
==2042== at 0x4A0887C: malloc (vg_replace_
==2042== by 0x405069: bm_read (bitmap.h:66)
==2042== by 0x4035A0: process_file.isra.3 (main.c:1056)
==2042== by 0x402C9E: main (main.c:1212)
==2042==
potrace: warning: 1.bmp: premature end of file
valgrind: m_mallocfree.c:268 (mk_plain_bszB): Assertion 'bszB != 0' failed.
valgrind: This is probably caused by your program erroneously writing
past the
end of a heap block and corrupting heap metadata. If you fix any
invalid writes reported by Memcheck, this assertion failure will
probably go away. Please try that before reporting this as a bug.
==2042== at 0x38057AAF: report_and_quit (m_libcassert. c:235) c:309) bszB.part. 5 (m_mallocfree. c:268) arena_malloc (m_mallocfree. c:1563) new_block (mc_malloc_ wrappers. c:263) wrappers. c:301) NORETURN (syswrap- linux.c: 103)
==2042== by 0x38057BF2: vgPlain_assert_fail (m_libcassert.
==2042== by 0x380009EC: mk_plain_
==2042== by 0x38063C87: vgPlain_
==2042== by 0x380299A4: vgMemCheck_
==2042== by 0x38029B3A: vgMemCheck_malloc (mc_malloc_
==2042== by 0x3809E490: vgPlain_scheduler (scheduler.c:1667)
==2042== by 0x380AD6F9: run_a_thread_
sched status:
running_tid=1
Thread 1: status = VgTs_Runnable malloc. c:270)
==2042== at 0x4A0887C: malloc (vg_replace_
==2042== by 0x354AE062B0: potrace_trace (potracelib.c:68)
==2042== by 0x40361A: process_file.isra.3 (main.c:1100)
==2042== by 0x402C9E: main (main.c:1212)