135 lines
8.1 KiB
Plaintext
135 lines
8.1 KiB
Plaintext
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URL: https://bugzilla.kernel.org/show_bug.cgi?id=169301
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Lukas Lueg 2016-09-18 09:07:55 UTC
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More news from the fuzzer. The attached image causes a heap-use-after-free
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when running btrfsck with ASAN over it; using btrfs-progs v4.7.2-56-ge8c2013
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==3439==ERROR: AddressSanitizer: heap-use-after-free on address 0x621000014170 at pc 0x0000005c05ae bp 0x7ffe84ef8d00 sp 0x7ffe84ef8cf8
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READ of size 4 at 0x621000014170 thread T0
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#0 0x5c05ad in free_extent_buffer /home/slave/dev/btrfsfuzz/src-asan/extent_io.c:579:10
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#1 0x59360c in btrfs_release_all_roots /home/slave/dev/btrfsfuzz/src-asan/disk-io.c:1096:3
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#2 0x5961bb in close_ctree_fs_info /home/slave/dev/btrfsfuzz/src-asan/disk-io.c:1805:2
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#3 0x5246e7 in close_ctree /home/slave/dev/btrfsfuzz/src-asan/./disk-io.h:155:9
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#4 0x51e334 in cmd_check /home/slave/dev/btrfsfuzz/src-asan/cmds-check.c:11618:2
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#5 0x4f0ee1 in main /home/slave/dev/btrfsfuzz/src-asan/btrfs.c:243:8
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#6 0x7f792c60e730 in __libc_start_main (/lib64/libc.so.6+0x20730)
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#7 0x421358 in _start (/home/slave/dev/btrfsfuzz/bin-asan/bin/btrfs+0x421358)
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Probably somewhat related to this: The image crash000255.img causes btrfsck to
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try to allocate around 3.5gb of memory in one chunk, sending ASAN into a death
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spiral. On systems with sufficient memory, the heap-use-after-free turns up.
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parent transid verify failed on 0 wanted 3472328296227680304 found 0
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parent transid verify failed on 0 wanted 3472328296227680304 found 0
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Ignoring transid failure
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Chunk[256, 228, 0]: length(4194304), offset(0), type(2) is not found in block group
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Chunk[256, 228, 0] stripe[1, 0] is not found in dev extent
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Chunk[256, 228, 4194304]: length(1638400), offset(4194304), type(5) is not found in block group
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Chunk[256, 228, 4194304] stripe[1, 4194304] is not found in dev extent
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Chunk[256, 228, 5832704]: length(1638400), offset(5832704), type(5) is not found in block group
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Chunk[256, 228, 5832704] stripe[1, 5832704] is not found in dev extent
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ref mismatch on [0 4096] extent item 0, found 1
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Backref 0 parent 0 root 0 not found in extent tree
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backpointer mismatch on [0 4096]
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bad extent [0, 4096), type mismatch with chunk
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ref mismatch on [131072 4096] extent item 0, found 1
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Backref 131072 parent 3 root 3 not found in extent tree
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backpointer mismatch on [131072 4096]
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ref mismatch on [4198400 4096] extent item 0, found 1
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Backref 4198400 parent 1 root 1 not found in extent tree
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backpointer mismatch on [4198400 4096]
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ref mismatch on [4231168 4096] extent item 0, found 1
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Backref 4231168 parent 7 root 7 not found in extent tree
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backpointer mismatch on [4231168 4096]
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ref mismatch on [3472328296227680304 3472328296227680304] extent item 0, found 1
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Backref 3472328296227680304 root 1 owner 2 offset 0 num_refs 0 not found in extent tree
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Incorrect local backref count on 3472328296227680304 root 1 owner 2 offset 0 found 1 wanted 0 back 0x60700000ddf0
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backpointer mismatch on [3472328296227680304 3472328296227680304]
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Dev extent's total-byte(0) is not equal to byte-used(7471104) in dev[1, 216, 1]
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checking free space cache
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checking fs roots
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root 5 root dir 3472328296227680304 not found
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checking csums
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checking root refs
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checking quota groups
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ERROR: while mapping refs: -5
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=================================================================
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==3439==ERROR: AddressSanitizer: heap-use-after-free on address 0x621000014170 at pc 0x0000005c05ae bp 0x7ffe84ef8d00 sp 0x7ffe84ef8cf8
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READ of size 4 at 0x621000014170 thread T0
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#0 0x5c05ad in free_extent_buffer /home/slave/dev/btrfsfuzz/src-asan/extent_io.c:579:10
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#1 0x59360c in btrfs_release_all_roots /home/slave/dev/btrfsfuzz/src-asan/disk-io.c:1096:3
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#2 0x5961bb in close_ctree_fs_info /home/slave/dev/btrfsfuzz/src-asan/disk-io.c:1805:2
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#3 0x5246e7 in close_ctree /home/slave/dev/btrfsfuzz/src-asan/./disk-io.h:155:9
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#4 0x51e334 in cmd_check /home/slave/dev/btrfsfuzz/src-asan/cmds-check.c:11618:2
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#5 0x4f0ee1 in main /home/slave/dev/btrfsfuzz/src-asan/btrfs.c:243:8
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#6 0x7f792c60e730 in __libc_start_main (/lib64/libc.so.6+0x20730)
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#7 0x421358 in _start (/home/slave/dev/btrfsfuzz/bin-asan/bin/btrfs+0x421358)
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0x621000014170 is located 112 bytes inside of 4224-byte region [0x621000014100,0x621000015180)
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freed by thread T0 here:
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#0 0x4bf990 in __interceptor_cfree.localalias.1 (/home/slave/dev/btrfsfuzz/bin-asan/bin/btrfs+0x4bf990)
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#1 0x5c0582 in free_extent_buffer /home/slave/dev/btrfsfuzz/src-asan/extent_io.c:591:3
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#2 0x5c1b18 in alloc_extent_buffer /home/slave/dev/btrfsfuzz/src-asan/extent_io.c:644:4
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#3 0x58de0c in btrfs_find_create_tree_block /home/slave/dev/btrfsfuzz/src-asan/disk-io.c:193:9
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#4 0x58e880 in read_tree_block_fs_info /home/slave/dev/btrfsfuzz/src-asan/disk-io.c:339:7
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#5 0x5f2d74 in read_tree_block /home/slave/dev/btrfsfuzz/src-asan/./disk-io.h:112:9
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#6 0x5f2b52 in travel_tree /home/slave/dev/btrfsfuzz/src-asan/qgroup-verify.c:692:7
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#7 0x5f299b in add_refs_for_implied /home/slave/dev/btrfsfuzz/src-asan/qgroup-verify.c:748:8
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#8 0x5efd39 in map_implied_refs /home/slave/dev/btrfsfuzz/src-asan/qgroup-verify.c:766:9
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#9 0x5eed89 in qgroup_verify_all /home/slave/dev/btrfsfuzz/src-asan/qgroup-verify.c:1366:8
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#10 0x51ea14 in cmd_check /home/slave/dev/btrfsfuzz/src-asan/cmds-check.c:11571:9
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#11 0x4f0ee1 in main /home/slave/dev/btrfsfuzz/src-asan/btrfs.c:243:8
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#12 0x7f792c60e730 in __libc_start_main (/lib64/libc.so.6+0x20730)
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previously allocated by thread T0 here:
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#0 0x4bfca0 in calloc (/home/slave/dev/btrfsfuzz/bin-asan/bin/btrfs+0x4bfca0)
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#1 0x5c16ca in __alloc_extent_buffer /home/slave/dev/btrfsfuzz/src-asan/extent_io.c:542:7
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#2 0x5c1b26 in alloc_extent_buffer /home/slave/dev/btrfsfuzz/src-asan/extent_io.c:646:8
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#3 0x58de0c in btrfs_find_create_tree_block /home/slave/dev/btrfsfuzz/src-asan/disk-io.c:193:9
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#4 0x58e880 in read_tree_block_fs_info /home/slave/dev/btrfsfuzz/src-asan/disk-io.c:339:7
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#5 0x5918a2 in read_tree_block /home/slave/dev/btrfsfuzz/src-asan/./disk-io.h:112:9
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#6 0x591712 in find_and_setup_root /home/slave/dev/btrfsfuzz/src-asan/disk-io.c:647:15
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#7 0x593243 in setup_root_or_create_block /home/slave/dev/btrfsfuzz/src-asan/disk-io.c:966:8
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#8 0x592a06 in btrfs_setup_all_roots /home/slave/dev/btrfsfuzz/src-asan/disk-io.c:1045:8
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#9 0x5948fe in __open_ctree_fd /home/slave/dev/btrfsfuzz/src-asan/disk-io.c:1341:8
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#10 0x5942b5 in open_ctree_fs_info /home/slave/dev/btrfsfuzz/src-asan/disk-io.c:1387:9
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#11 0x51dff2 in cmd_check /home/slave/dev/btrfsfuzz/src-asan/cmds-check.c:11382:9
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#12 0x4f0ee1 in main /home/slave/dev/btrfsfuzz/src-asan/btrfs.c:243:8
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#13 0x7f792c60e730 in __libc_start_main (/lib64/libc.so.6+0x20730)
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SUMMARY: AddressSanitizer: heap-use-after-free /home/slave/dev/btrfsfuzz/src-asan/extent_io.c:579:10 in free_extent_buffer
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Shadow bytes around the buggy address:
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0x0c427fffa7d0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
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0x0c427fffa7e0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
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0x0c427fffa7f0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
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0x0c427fffa800: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
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0x0c427fffa810: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
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=>0x0c427fffa820: fd fd fd fd fd fd fd fd fd fd fd fd fd fd[fd]fd
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0x0c427fffa830: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
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0x0c427fffa840: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
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0x0c427fffa850: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
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0x0c427fffa860: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
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0x0c427fffa870: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
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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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==3439==ABORTING
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