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URL: https://bugzilla.kernel.org/show_bug.cgi?id=156731
Lukas Lueg 2016-09-13 19:53:59 UTC
More news from the fuzzer. The attached image causes btrfsck to
buffer-overflow. Using btrfs-progs v4.7-42-g56e9586, compiled with ASAN
(doesn't crash without)
==17647==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x621000017980 at pc 0x00000052dde3 bp 0x7ffecc974fe0 sp 0x7ffecc974fd8
READ of size 4 at 0x621000017980 thread T0
#0 0x52dde2 in btrfs_extent_data_ref_count /home/lukas/dev/btrfsfuzz/src-asan/./ctree.h:1582:1
#1 0x5329ae in run_next_block /home/lukas/dev/btrfsfuzz/src-asan/cmds-check.c:6380:6
#2 0x52f584 in deal_root_from_list /home/lukas/dev/btrfsfuzz/src-asan/cmds-check.c:8391:10
#3 0x520f81 in check_chunks_and_extents /home/lukas/dev/btrfsfuzz/src-asan/cmds-check.c:8558:8
#4 0x51e5a9 in cmd_check /home/lukas/dev/btrfsfuzz/src-asan/cmds-check.c:11493:9
#5 0x4f0ee1 in main /home/lukas/dev/btrfsfuzz/src-asan/btrfs.c:243:8
#6 0x7faced2c8730 in __libc_start_main (/lib64/libc.so.6+0x20730)
#7 0x421358 in _start (/home/lukas/dev/btrfsfuzz/bin-asan/bin/btrfs+0x421358)
cat crashing_images/id:000047,sig:11,src:000343+000051,op:splice,rep:4.log
=================================================================
==17647==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x621000017980 at pc 0x00000052dde3 bp 0x7ffecc974fe0 sp 0x7ffecc974fd8
READ of size 4 at 0x621000017980 thread T0
#0 0x52dde2 in btrfs_extent_data_ref_count /home/lukas/dev/btrfsfuzz/src-asan/./ctree.h:1582:1
#1 0x5329ae in run_next_block /home/lukas/dev/btrfsfuzz/src-asan/cmds-check.c:6380:6
#2 0x52f584 in deal_root_from_list /home/lukas/dev/btrfsfuzz/src-asan/cmds-check.c:8391:10
#3 0x520f81 in check_chunks_and_extents /home/lukas/dev/btrfsfuzz/src-asan/cmds-check.c:8558:8
#4 0x51e5a9 in cmd_check /home/lukas/dev/btrfsfuzz/src-asan/cmds-check.c:11493:9
#5 0x4f0ee1 in main /home/lukas/dev/btrfsfuzz/src-asan/btrfs.c:243:8
#6 0x7faced2c8730 in __libc_start_main (/lib64/libc.so.6+0x20730)
#7 0x421358 in _start (/home/lukas/dev/btrfsfuzz/bin-asan/bin/btrfs+0x421358)
0x621000017980 is located 0 bytes to the right of 4224-byte region [0x621000016900,0x621000017980)
allocated by thread T0 here:
#0 0x4bfca0 in calloc (/home/lukas/dev/btrfsfuzz/bin-asan/bin/btrfs+0x4bfca0)
#1 0x5c16ca in __alloc_extent_buffer /home/lukas/dev/btrfsfuzz/src-asan/extent_io.c:542:7
#2 0x5c1b26 in alloc_extent_buffer /home/lukas/dev/btrfsfuzz/src-asan/extent_io.c:646:8
#3 0x58de0c in btrfs_find_create_tree_block /home/lukas/dev/btrfsfuzz/src-asan/disk-io.c:193:9
#4 0x58e880 in read_tree_block_fs_info /home/lukas/dev/btrfsfuzz/src-asan/disk-io.c:339:7
#5 0x5918a2 in read_tree_block /home/lukas/dev/btrfsfuzz/src-asan/./disk-io.h:112:9
#6 0x591712 in find_and_setup_root /home/lukas/dev/btrfsfuzz/src-asan/disk-io.c:647:15
#7 0x593243 in setup_root_or_create_block /home/lukas/dev/btrfsfuzz/src-asan/disk-io.c:966:8
#8 0x592850 in btrfs_setup_all_roots /home/lukas/dev/btrfsfuzz/src-asan/disk-io.c:1031:8
#9 0x5948fe in __open_ctree_fd /home/lukas/dev/btrfsfuzz/src-asan/disk-io.c:1341:8
#10 0x5942b5 in open_ctree_fs_info /home/lukas/dev/btrfsfuzz/src-asan/disk-io.c:1387:9
#11 0x51dff2 in cmd_check /home/lukas/dev/btrfsfuzz/src-asan/cmds-check.c:11382:9
#12 0x4f0ee1 in main /home/lukas/dev/btrfsfuzz/src-asan/btrfs.c:243:8
#13 0x7faced2c8730 in __libc_start_main (/lib64/libc.so.6+0x20730)
SUMMARY: AddressSanitizer: heap-buffer-overflow /home/lukas/dev/btrfsfuzz/src-asan/./ctree.h:1582:1 in btrfs_extent_data_ref_count
Shadow bytes around the buggy address:
0x0c427fffaee0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c427fffaef0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c427fffaf00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c427fffaf10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c427fffaf20: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x0c427fffaf30:[fa]fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c427fffaf40: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c427fffaf50: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c427fffaf60: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c427fffaf70: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c427fffaf80: 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
Left alloca redzone: ca
Right alloca redzone: cb
==17647==ABORTING
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