+Cc more people who recently touched f2fs On Mon, 3 May 2021 at 10:27, 'Dmitry Vyukov' via syzkaller-bugs <syzkaller-b...@googlegroups.com> wrote: > On Mon, May 3, 2021 at 10:24 AM syzbot > <syzbot+9d90dad32dd9727ed...@syzkaller.appspotmail.com> wrote: > > > > Hello, > > > > syzbot found the following issue on: > > > > HEAD commit: d2b6f8a1 Merge tag 'xfs-5.13-merge-3' of git://git.kernel... > > git tree: upstream > > console output: https://syzkaller.appspot.com/x/log.txt?x=15f19ca5d00000 > > kernel config: https://syzkaller.appspot.com/x/.config?x=53fdf14defd48c56 > > dashboard link: https://syzkaller.appspot.com/bug?extid=9d90dad32dd9727ed084 > > compiler: Debian clang version 11.0.1-2 > > > > Unfortunately, I don't have any reproducer for this issue yet. > > > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > > Reported-by: syzbot+9d90dad32dd9727ed...@syzkaller.appspotmail.com > > This looks like a bug in F2FS. > Interestingly this was detected by ARM MTE before but was > mis-root-caused I think: > https://lore.kernel.org/lkml/0000000000008d396205b9e4a...@google.com/ > This can't be detected by KASAN directly because it doesn't instrument > mm/slab*. This can only be detected by MTE/KFENCE. > > > ================================================================== > > BUG: KFENCE: use-after-free write in kmem_cache_destroy+0x1f/0x120 > > mm/slab_common.c:486 > > > > Use-after-free write at 0xffff88823bc16040 (in kfence-#10): > > kmem_cache_destroy+0x1f/0x120 mm/slab_common.c:486 > > f2fs_recover_fsync_data+0x75b0/0x8380 fs/f2fs/recovery.c:869
This looks like a double-kmem_cache_destroy of fsync_entry_slab in the f2fs code. But looking at this code briefly, I couldn't say what the fix would be. > > f2fs_fill_super+0x9393/0xa420 fs/f2fs/super.c:3945 > > mount_bdev+0x26c/0x3a0 fs/super.c:1367 > > legacy_get_tree+0xea/0x180 fs/fs_context.c:592 > > vfs_get_tree+0x86/0x270 fs/super.c:1497 > > do_new_mount fs/namespace.c:2905 [inline] > > path_mount+0x196f/0x2be0 fs/namespace.c:3235 > > do_mount fs/namespace.c:3248 [inline] > > __do_sys_mount fs/namespace.c:3456 [inline] > > __se_sys_mount+0x2f9/0x3b0 fs/namespace.c:3433 > > do_syscall_64+0x3f/0xb0 arch/x86/entry/common.c:47 > > entry_SYSCALL_64_after_hwframe+0x44/0xae > > > > kfence-#10 [0xffff88823bc16000-0xffff88823bc160df, size=224, > > cache=kmem_cache] allocated by task 15453: > > kmem_cache_zalloc include/linux/slab.h:676 [inline] > > create_cache mm/slab_common.c:247 [inline] > > kmem_cache_create_usercopy+0x12a/0x2f0 mm/slab_common.c:350 > > kmem_cache_create+0xf/0x20 mm/slab_common.c:405 > > f2fs_kmem_cache_create fs/f2fs/f2fs.h:2463 [inline] > > f2fs_recover_fsync_data+0x1f0/0x8380 fs/f2fs/recovery.c:790 > > f2fs_fill_super+0x9393/0xa420 fs/f2fs/super.c:3945 > > mount_bdev+0x26c/0x3a0 fs/super.c:1367 > > legacy_get_tree+0xea/0x180 fs/fs_context.c:592 > > vfs_get_tree+0x86/0x270 fs/super.c:1497 > > do_new_mount fs/namespace.c:2905 [inline] > > path_mount+0x196f/0x2be0 fs/namespace.c:3235 > > do_mount fs/namespace.c:3248 [inline] > > __do_sys_mount fs/namespace.c:3456 [inline] > > __se_sys_mount+0x2f9/0x3b0 fs/namespace.c:3433 > > do_syscall_64+0x3f/0xb0 arch/x86/entry/common.c:47 > > entry_SYSCALL_64_after_hwframe+0x44/0xae > > > > freed by task 15448: > > kobject_cleanup+0x1c9/0x280 lib/kobject.c:705 > > shutdown_cache mm/slab_common.c:463 [inline] > > kmem_cache_destroy+0x93/0x120 mm/slab_common.c:492 > > f2fs_recover_fsync_data+0x75b0/0x8380 fs/f2fs/recovery.c:869 > > f2fs_fill_super+0x9393/0xa420 fs/f2fs/super.c:3945 > > mount_bdev+0x26c/0x3a0 fs/super.c:1367 > > legacy_get_tree+0xea/0x180 fs/fs_context.c:592 > > vfs_get_tree+0x86/0x270 fs/super.c:1497 > > do_new_mount fs/namespace.c:2905 [inline] > > path_mount+0x196f/0x2be0 fs/namespace.c:3235 > > do_mount fs/namespace.c:3248 [inline] > > __do_sys_mount fs/namespace.c:3456 [inline] > > __se_sys_mount+0x2f9/0x3b0 fs/namespace.c:3433 > > do_syscall_64+0x3f/0xb0 arch/x86/entry/common.c:47 > > entry_SYSCALL_64_after_hwframe+0x44/0xae > > > > CPU: 0 PID: 15453 Comm: syz-executor.0 Not tainted 5.12.0-syzkaller #0 > > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > > Google 01/01/2011 > > RIP: 0010:kmem_cache_destroy+0x1f/0x120 mm/slab_common.c:488 > > Code: 0f 1f 84 00 00 00 00 00 0f 1f 00 48 85 ff 0f 84 09 01 00 00 41 57 41 > > 56 53 48 89 fb 48 c7 c7 b8 07 dc 8c 31 f6 e8 b1 c3 00 08 <ff> 4b 40 0f 85 > > c0 00 00 00 48 89 df e8 20 a2 14 00 48 89 df e8 18 > > RSP: 0018:ffffc900030af320 EFLAGS: 00010286 > > RAX: 0000000000000000 RBX: ffff88823bc16000 RCX: 0000000000000001 > > RDX: 0000000000000001 RSI: 0000000000000008 RDI: 0000000000000001 > > RBP: ffffc900030af870 R08: dffffc0000000000 R09: fffffbfff19b80f8 > > R10: fffffbfff19b80f8 R11: 0000000000000000 R12: ffff88808c3a4000 > > R13: dffffc0000000000 R14: 0000000000000000 R15: 1ffff92000615eb0 > > FS: 00007f60a5228700(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000 > > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > > CR2: ffff88823bc16040 CR3: 000000001ccd8000 CR4: 00000000001526f0 > > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > > Call Trace: > > f2fs_recover_fsync_data+0x75b0/0x8380 fs/f2fs/recovery.c:869 > > f2fs_fill_super+0x9393/0xa420 fs/f2fs/super.c:3945 > > mount_bdev+0x26c/0x3a0 fs/super.c:1367 > > legacy_get_tree+0xea/0x180 fs/fs_context.c:592 > > vfs_get_tree+0x86/0x270 fs/super.c:1497 > > do_new_mount fs/namespace.c:2905 [inline] > > path_mount+0x196f/0x2be0 fs/namespace.c:3235 > > do_mount fs/namespace.c:3248 [inline] > > __do_sys_mount fs/namespace.c:3456 [inline] > > __se_sys_mount+0x2f9/0x3b0 fs/namespace.c:3433 > > do_syscall_64+0x3f/0xb0 arch/x86/entry/common.c:47 > > entry_SYSCALL_64_after_hwframe+0x44/0xae > > RIP: 0033:0x467b1a > > Code: 48 c7 c2 bc ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb d2 e8 b8 04 00 > > 00 0f 1f 84 00 00 00 00 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff > > ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 > > RSP: 002b:00007f60a5227fa8 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5 > > RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 0000000000467b1a > > RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f60a5228000 > > RBP: 00007f60a5228040 R08: 00007f60a5228040 R09: 0000000020000000 > > R10: 0000000000000000 R11: 0000000000000206 R12: 0000000020000000 > > R13: 0000000020000100 R14: 00007f60a5228000 R15: 0000000020014b00 > > ================================================================== > > > > > > --- > > This report is generated by a bot. It may contain errors. > > See https://goo.gl/tpsmEJ for more information about syzbot. > > syzbot engineers can be reached at syzkal...@googlegroups.com. > > > > syzbot will keep track of this issue. See: > > https://goo.gl/tpsmEJ#status for how to communicate with syzbot. _______________________________________________ Linux-f2fs-devel mailing list Linux-f2fs-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel
