Messages in this thread | | | Date | Tue, 03 Apr 2018 10:01:01 -0700 | Subject | KASAN: use-after-free Read in xfs_inobt_init_key_from_rec | From | syzbot <> |
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Hello,
syzbot hit the following crash on upstream commit 642e7fd23353e22290e3d51719fcb658dc252342 (Tue Apr 3 04:22:12 2018 +0000) Merge branch 'syscalls-next' of git://git.kernel.org/pub/scm/linux/kernel/git/brodo/linux syzbot dashboard link: https://syzkaller.appspot.com/bug?extid=08ab33be0178b76851c8
C reproducer: https://syzkaller.appspot.com/x/repro.c?id=5951352765153280 syzkaller reproducer: https://syzkaller.appspot.com/x/repro.syz?id=5417464171069440 Raw console output: https://syzkaller.appspot.com/x/log.txt?id=6712144213049344 Kernel config: https://syzkaller.appspot.com/x/.config?id=-6874493495260513980 compiler: gcc (GCC) 7.1.1 20170620
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XFS (loop0): Mounting V4 Filesystem XFS (loop0): totally zeroed log ================================================================== BUG: KASAN: use-after-free in xfs_inobt_init_key_from_rec+0x6a/0x70 fs/xfs/libxfs/xfs_ialloc_btree.c:195 Read of size 4 at addr ffff8801af98cf00 by task syzkaller185183/4464
CPU: 0 PID: 4464 Comm: syzkaller185183 Not tainted 4.16.0+ #12 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1a7/0x27d lib/dump_stack.c:53 print_address_description+0x73/0x250 mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report+0x23c/0x360 mm/kasan/report.c:412 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report.c:432 xfs_inobt_init_key_from_rec+0x6a/0x70 fs/xfs/libxfs/xfs_ialloc_btree.c:195 xfs_lookup_get_search_key+0x7e/0xc0 fs/xfs/libxfs/xfs_btree.c:1858 xfs_btree_lookup+0x932/0x1180 fs/xfs/libxfs/xfs_btree.c:1948 xfs_inobt_lookup fs/xfs/libxfs/xfs_ialloc.c:75 [inline] xfs_imap_lookup+0x216/0x640 fs/xfs/libxfs/xfs_ialloc.c:2235 xfs_imap+0x78f/0x960 fs/xfs/libxfs/xfs_ialloc.c:2364 xfs_iread+0xc7/0x770 fs/xfs/libxfs/xfs_inode_buf.c:556 xfs_iget_cache_miss fs/xfs/xfs_icache.c:475 [inline] xfs_iget+0xcec/0x3060 fs/xfs/xfs_icache.c:626 xfs_mountfs+0x139a/0x2690 fs/xfs/xfs_mount.c:881 xfs_fs_fill_super+0xc8d/0x1250 fs/xfs/xfs_super.c:1703 mount_bdev+0x2b7/0x370 fs/super.c:1119 xfs_fs_mount+0x34/0x40 fs/xfs/xfs_super.c:1770 mount_fs+0x66/0x2d0 fs/super.c:1222 vfs_kern_mount.part.26+0xc6/0x4a0 fs/namespace.c:1037 vfs_kern_mount fs/namespace.c:2514 [inline] do_new_mount fs/namespace.c:2517 [inline] do_mount+0xea4/0x2b90 fs/namespace.c:2847 ksys_mount+0xab/0x120 fs/namespace.c:3063 SYSC_mount fs/namespace.c:3077 [inline] SyS_mount+0x39/0x50 fs/namespace.c:3074 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x44371a RSP: 002b:00007fff43e464c8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000020000840 RCX: 000000000044371a RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007fff43e464d0 RBP: 0000000000000003 R08: 0000000020018900 R09: 000000000000000a R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000004 R13: 0000000000402610 R14: 0000000000000000 R15: 0000000000000000
Allocated by task 4462: save_stack+0x43/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:552 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:489 kmem_cache_alloc+0x12e/0x760 mm/slab.c:3542 getname_flags+0xcb/0x580 fs/namei.c:138 getname+0x19/0x20 fs/namei.c:209 do_sys_open+0x2e7/0x6d0 fs/open.c:1095 SYSC_open fs/open.c:1119 [inline] SyS_open+0x2d/0x40 fs/open.c:1114 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7
Freed by task 4462: save_stack+0x43/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:520 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:527 __cache_free mm/slab.c:3486 [inline] kmem_cache_free+0x83/0x2a0 mm/slab.c:3744 putname+0xee/0x130 fs/namei.c:258 do_sys_open+0x31b/0x6d0 fs/open.c:1110 SYSC_open fs/open.c:1119 [inline] SyS_open+0x2d/0x40 fs/open.c:1114 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7
The buggy address belongs to the object at ffff8801af98c600 which belongs to the cache names_cache of size 4096 The buggy address is located 2304 bytes inside of 4096-byte region [ffff8801af98c600, ffff8801af98d600) The buggy address belongs to the page: page:ffffea0006be6300 count:1 mapcount:0 mapping:ffff8801af98c600 index:0x0 compound_mapcount: 0 flags: 0x2fffc0000008100(slab|head) raw: 02fffc0000008100 ffff8801af98c600 0000000000000000 0000000100000001 raw: ffffea0006be7aa0 ffffea0006be5f20 ffff8801da5ea600 0000000000000000 page dumped because: kasan: bad access detected
Memory state around the buggy address: ffff8801af98ce00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801af98ce80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ffff8801af98cf00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8801af98cf80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801af98d000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================
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