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Fixing the problems by one does not scale now. Add more images despite the fuzz tests will fail. They have been for some time already. Reported-by: Lukas Lueg <lukas.lueg@gmail.com> Signed-off-by: David Sterba <dsterba@suse.com>
84 lines
5.0 KiB
Plaintext
84 lines
5.0 KiB
Plaintext
URL: https://bugzilla.kernel.org/show_bug.cgi?id=156731
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Lukas Lueg 2016-09-13 19:53:59 UTC
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More news from the fuzzer. The attached image causes btrfsck to
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buffer-overflow. Using btrfs-progs v4.7-42-g56e9586, compiled with ASAN
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(doesn't crash without)
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==17647==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x621000017980 at pc 0x00000052dde3 bp 0x7ffecc974fe0 sp 0x7ffecc974fd8
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READ of size 4 at 0x621000017980 thread T0
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#0 0x52dde2 in btrfs_extent_data_ref_count /home/lukas/dev/btrfsfuzz/src-asan/./ctree.h:1582:1
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#1 0x5329ae in run_next_block /home/lukas/dev/btrfsfuzz/src-asan/cmds-check.c:6380:6
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#2 0x52f584 in deal_root_from_list /home/lukas/dev/btrfsfuzz/src-asan/cmds-check.c:8391:10
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#3 0x520f81 in check_chunks_and_extents /home/lukas/dev/btrfsfuzz/src-asan/cmds-check.c:8558:8
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#4 0x51e5a9 in cmd_check /home/lukas/dev/btrfsfuzz/src-asan/cmds-check.c:11493:9
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#5 0x4f0ee1 in main /home/lukas/dev/btrfsfuzz/src-asan/btrfs.c:243:8
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#6 0x7faced2c8730 in __libc_start_main (/lib64/libc.so.6+0x20730)
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#7 0x421358 in _start (/home/lukas/dev/btrfsfuzz/bin-asan/bin/btrfs+0x421358)
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cat crashing_images/id:000047,sig:11,src:000343+000051,op:splice,rep:4.log
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=================================================================
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==17647==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x621000017980 at pc 0x00000052dde3 bp 0x7ffecc974fe0 sp 0x7ffecc974fd8
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READ of size 4 at 0x621000017980 thread T0
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#0 0x52dde2 in btrfs_extent_data_ref_count /home/lukas/dev/btrfsfuzz/src-asan/./ctree.h:1582:1
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#1 0x5329ae in run_next_block /home/lukas/dev/btrfsfuzz/src-asan/cmds-check.c:6380:6
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#2 0x52f584 in deal_root_from_list /home/lukas/dev/btrfsfuzz/src-asan/cmds-check.c:8391:10
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#3 0x520f81 in check_chunks_and_extents /home/lukas/dev/btrfsfuzz/src-asan/cmds-check.c:8558:8
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#4 0x51e5a9 in cmd_check /home/lukas/dev/btrfsfuzz/src-asan/cmds-check.c:11493:9
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#5 0x4f0ee1 in main /home/lukas/dev/btrfsfuzz/src-asan/btrfs.c:243:8
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#6 0x7faced2c8730 in __libc_start_main (/lib64/libc.so.6+0x20730)
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#7 0x421358 in _start (/home/lukas/dev/btrfsfuzz/bin-asan/bin/btrfs+0x421358)
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0x621000017980 is located 0 bytes to the right of 4224-byte region [0x621000016900,0x621000017980)
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allocated by thread T0 here:
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#0 0x4bfca0 in calloc (/home/lukas/dev/btrfsfuzz/bin-asan/bin/btrfs+0x4bfca0)
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#1 0x5c16ca in __alloc_extent_buffer /home/lukas/dev/btrfsfuzz/src-asan/extent_io.c:542:7
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#2 0x5c1b26 in alloc_extent_buffer /home/lukas/dev/btrfsfuzz/src-asan/extent_io.c:646:8
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#3 0x58de0c in btrfs_find_create_tree_block /home/lukas/dev/btrfsfuzz/src-asan/disk-io.c:193:9
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#4 0x58e880 in read_tree_block_fs_info /home/lukas/dev/btrfsfuzz/src-asan/disk-io.c:339:7
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#5 0x5918a2 in read_tree_block /home/lukas/dev/btrfsfuzz/src-asan/./disk-io.h:112:9
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#6 0x591712 in find_and_setup_root /home/lukas/dev/btrfsfuzz/src-asan/disk-io.c:647:15
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#7 0x593243 in setup_root_or_create_block /home/lukas/dev/btrfsfuzz/src-asan/disk-io.c:966:8
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#8 0x592850 in btrfs_setup_all_roots /home/lukas/dev/btrfsfuzz/src-asan/disk-io.c:1031:8
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#9 0x5948fe in __open_ctree_fd /home/lukas/dev/btrfsfuzz/src-asan/disk-io.c:1341:8
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#10 0x5942b5 in open_ctree_fs_info /home/lukas/dev/btrfsfuzz/src-asan/disk-io.c:1387:9
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#11 0x51dff2 in cmd_check /home/lukas/dev/btrfsfuzz/src-asan/cmds-check.c:11382:9
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#12 0x4f0ee1 in main /home/lukas/dev/btrfsfuzz/src-asan/btrfs.c:243:8
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#13 0x7faced2c8730 in __libc_start_main (/lib64/libc.so.6+0x20730)
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SUMMARY: AddressSanitizer: heap-buffer-overflow /home/lukas/dev/btrfsfuzz/src-asan/./ctree.h:1582:1 in btrfs_extent_data_ref_count
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Shadow bytes around the buggy address:
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0x0c427fffaee0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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0x0c427fffaef0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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0x0c427fffaf00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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0x0c427fffaf10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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0x0c427fffaf20: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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=>0x0c427fffaf30:[fa]fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
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0x0c427fffaf40: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
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0x0c427fffaf50: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
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0x0c427fffaf60: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
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0x0c427fffaf70: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
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0x0c427fffaf80: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
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Shadow byte legend (one shadow byte represents 8 application bytes):
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Addressable: 00
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Partially addressable: 01 02 03 04 05 06 07
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Heap left redzone: fa
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Heap right redzone: fb
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Freed heap region: fd
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Stack left redzone: f1
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Stack mid redzone: f2
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Stack right redzone: f3
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Stack partial redzone: f4
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Stack after return: f5
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Stack use after scope: f8
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Global redzone: f9
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Global init order: f6
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Poisoned by user: f7
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Container overflow: fc
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Array cookie: ac
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Intra object redzone: bb
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ASan internal: fe
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Left alloca redzone: ca
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Right alloca redzone: cb
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==17647==ABORTING
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