Hi all,
I've been doing some ext4 fuzzing with AFL lately and run into a number
of crashes/warnings. Below is a list of these present in a 100% vanilla
mainline kernel. I will keep debugging and submitting patches until the
list is empty. In the meantime, the list is a useful way to keep track
of each bug and gauge the overall progress.
If anybody thinks they know what causes a particular bug, I'm happy to
test patches or provide more info. The only thing I can't do is to post
full-blown disk images or reproducers. Also note that several of these
may actually be the same underlying bug.
1. kasan: GPF could be caused by NULL-ptr deref or user memory
accessgeneral protection fault: 0000 [#1] KASAN
http://139.162.151.198/f/ext4/57be666646a37e9821d52bc64846a3b3b785ee7a
2. kernel BUG at fs/buffer.c:2994!
http://139.162.151.198/f/ext4/7df880da89c82579c15ca8bc786a3467ca9c47f7
3. kernel BUG at fs/ext4/inode.c:3709!
http://139.162.151.198/f/ext4/5bdefda69f39b2f2c56d9b67d5b7d9e2cc8dfd5f
4. kernel BUG at fs/ext4/mballoc.c:3188!
http://139.162.151.198/f/ext4/34284738d67f0405325b2c43211c56020b9d0211
5. kernel BUG at fs/ext4/mballoc.c:3518!
http://139.162.151.198/f/ext4/0f702e84173b87861c4ce226cc2e82f600ad9d0c
6. kernel BUG at fs/jbd2/commit.c:825!
http://139.162.151.198/f/ext4/3143febf7925bd1ea398bd1a775551133bd69ffd
7. WARNING: CPU: 0 PID: 58 at fs/ext4/ext4.h:2807
ext4_block_bitmap_csum_set+0x358/0x600
http://139.162.151.198/f/ext4/9628c19aff0bbaaae4149a03486305c7f6cd7523
8. WARNING: CPU: 0 PID: 58 at fs/ext4/mballoc.c:3987
ext4_discard_preallocations+0x6cb/0x8b0
http://139.162.151.198/f/ext4/0181e37a689dfcb8565695d93172e790a34a3d14
9. WARNING: CPU: 0 PID: 58 at fs/jbd2/transaction.c:293
start_this_handle+0xab6/0xcf0
http://139.162.151.198/f/ext4/55c691ba260963ffe20b365298e1f79f3b81968a
10. WARNING: CPU: 0 PID: 58 at kernel/locking/mutex-debug.c:78
debug_mutex_unlock+0x214/0x520
http://139.162.151.198/f/ext4/000ac1bce9ae7640565328ddcceb31a675e3052a
11. WARNING: CPU: 0 PID: 58 at lib/idr.c:401 idr_preload+0xec/0x110
http://139.162.151.198/f/ext4/7eace56beb912159fba1776ede9c2566f35f95ca
12. WARNING: CPU: 0 PID: 58 at lib/list_debug.c:36 __list_add+0x169/0x1c0
http://139.162.151.198/f/ext4/488a8e50b5137e01d1dd54e30e0e2fe34d8f0b27
13. WARNING: CPU: 0 PID: 58 at lib/list_debug.c:56
__list_del_entry+0x135/0x1d0
http://139.162.151.198/f/ext4/2e2c6122422aa6007cec500846fe8f891e954fee
14. WARNING: CPU: 0 PID: 58 at lib/list_debug.c:59
__list_del_entry+0x14f/0x1d0
http://139.162.151.198/f/ext4/1ac079bb08a23c32500cf5d4c29a29ca615f9295
15. WARNING: CPU: 0 PID: 58 at mm/slab_common.c:861 kmalloc_slab+0x8a/0x90
http://139.162.151.198/f/ext4/53b3aab7ddab0fb156047ea5cf72c359511f2726
Vegard
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