34 lines
1.4 KiB
Plaintext
34 lines
1.4 KiB
Plaintext
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URL: https://bugzilla.kernel.org/show_bug.cgi?id=153641
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Lukas Lueg 2016-08-23 19:54:45 UTC
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Created attachment 229941 [details]
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Image triggering btrfsck into asan error
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The filesystem-image attached to this bug drives btrfsck from btrfs-progs
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v4.7-42-g56e9586 into a heap-use-after-free. The src was from kdave's mirror,
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devel branch. CFLAGS='-DNDEBUG -O1 -g -fsanitize=address
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-fno-omit-frame-pointer -fno-optimize-sibling-calls'
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The juicy parts:
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==32639==ERROR: AddressSanitizer: heap-use-after-free on address
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0x621000019170 at pc 0x0000005c046e bp 0x7fff631e48d0 sp 0x7fff631e48c8
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READ of size 4 at 0x621000019170 thread T0
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#0 0x5c046d in free_extent_buffer
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/home/lukas/dev/btrfsprogs_fuzz/src/extent_io.c:579:10
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#1 0x59356c in btrfs_release_all_roots
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/home/lukas/dev/btrfsprogs_fuzz/src/disk-io.c:1084:3
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#2 0x5949a7 in __open_ctree_fd
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/home/lukas/dev/btrfsprogs_fuzz/src/disk-io.c:1325:2
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#3 0x594325 in open_ctree_fs_info
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/home/lukas/dev/btrfsprogs_fuzz/src/disk-io.c:1363:9
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#4 0x51e717 in cmd_check
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/home/lukas/dev/btrfsprogs_fuzz/src/cmds-check.c:11320:9
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#5 0x4f0f81 in main /home/lukas/dev/btrfsprogs_fuzz/src/btrfs.c:243:8
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#6 0x7f5ce75ee730 in __libc_start_main (/lib64/libc.so.6+0x20730)
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#7 0x4213f8 in _start (/home/lukas/dev/btrfsfuzz/bin/bin/btrfs+0x4213f8)
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Note that the bug happens within core itself. The kernel may be vulnerable as
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well, I didn't check, though.
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