> On Sep 13, 2022, at 1:51 PM, syzbot <syzbot+29dc75ed37be943c610e@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > > Hello, > > syzbot found the following issue on: This is almost certainly an NTFS3 error handling bug due to mounting the broken filesystem image, but the NTFS3 maintainer and list were not CC'd. Cheers, Andreas > > HEAD commit: a6b443748715 Merge branch 'for-next/core', remote-tracking.. > git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci > console output: https://syzkaller.appspot.com/x/log.txt?x=16271d4f080000 > kernel config: https://syzkaller.appspot.com/x/.config?x=e79d82586727c5df > dashboard link: https://syzkaller.appspot.com/bug?extid=29dc75ed37be943c610e > compiler: Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2 > userspace arch: arm64 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=162474a7080000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=119b6b78880000 > > Downloadable assets: > disk image: https://storage.googleapis.com/1436897f0dc0/disk-a6b44374.raw.xz > vmlinux: https://storage.googleapis.com/68c4de151fbb/vmlinux-a6b44374.xz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+29dc75ed37be943c610e@xxxxxxxxxxxxxxxxxxxxxxxxx > > ntfs3: loop0: Different NTFS' sector size (1024) and media sector size (512) > ntfs3: loop0: RAW NTFS volume: Filesystem size 0.00 Gb > volume size 0.00 Gb. Mount in read-only > ntfs3: loop0: Failed to load $Extend. > Unable to handle kernel NULL pointer dereference at virtual address 0000000000000008 > Mem abort info: > ESR = 0x0000000096000006 > EC = 0x25: DABT (current EL), IL = 32 bits > SET = 0, FnV = 0 > EA = 0, S1PTW = 0 > FSC = 0x06: level 2 translation fault > Data abort info: > ISV = 0, ISS = 0x00000006 > CM = 0, WnR = 0 > user pgtable: 4k pages, 48-bit VAs, pgdp=0000000109094000 > [0000000000000008] pgd=080000010aed9003, p4d=080000010aed9003, pud=080000010738d003, pmd=0000000000000000 > Internal error: Oops: 96000006 [#1] PREEMPT SMP > Modules linked in: > CPU: 0 PID: 3027 Comm: syz-executor119 Not tainted 6.0.0-rc4-syzkaller-17255-ga6b443748715 #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022 > pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) > pc : d_flags_for_inode fs/dcache.c:1980 [inline] > pc : __d_instantiate+0x2a0/0x2e4 fs/dcache.c:1998 > lr : d_flags_for_inode fs/dcache.c:1979 [inline] > lr : __d_instantiate+0x80/0x2e4 fs/dcache.c:1998 > sp : ffff8000126f3ac0 > x29: ffff8000126f3ac0 x28: 0000000040000000 x27: ffff0000cd3a0000 > x26: ffff80000cf0e000 x25: fffffc0000000000 x24: 000000000001f000 > x23: ffff0000cd3a0000 x22: 0000000000000008 x21: 0000000000000000 > x20: ffff0000ca50ce48 x19: ffff0000c7732750 x18: 00000000000000c0 > x17: ffff80000dd3a698 x16: ffff80000db78658 x15: ffff0000c4f13500 > x14: 00000000000000b8 x13: 00000000ffffffff x12: ffff0000c4f13500 > x11: ff808000085e2a88 x10: 0000000000000000 x9 : ffff0000c4f13500 > x8 : 0000000000000000 x7 : ffff8000085e2e0c x6 : 0000000000000000 > x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000000 > x2 : 0000000000000001 x1 : 0000000000000000 x0 : 0000000000000000 > Call trace: > d_flags_for_inode fs/dcache.c:1980 [inline] > __d_instantiate+0x2a0/0x2e4 fs/dcache.c:1998 > d_instantiate fs/dcache.c:2036 [inline] > d_make_root+0x64/0xa8 fs/dcache.c:2071 > ntfs_fill_super+0x1420/0x14a4 fs/ntfs/super.c:180 > get_tree_bdev+0x1e8/0x2a0 fs/super.c:1323 > ntfs_fs_get_tree+0x28/0x38 fs/ntfs3/super.c:1358 > vfs_get_tree+0x40/0x140 fs/super.c:1530 > do_new_mount+0x1dc/0x4e4 fs/namespace.c:3040 > path_mount+0x358/0x914 fs/namespace.c:3370 > do_mount fs/namespace.c:3383 [inline] > __do_sys_mount fs/namespace.c:3591 [inline] > __se_sys_mount fs/namespace.c:3568 [inline] > __arm64_sys_mount+0x2f8/0x408 fs/namespace.c:3568 > __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] > invoke_syscall arch/arm64/kernel/syscall.c:52 [inline] > el0_svc_common+0x138/0x220 arch/arm64/kernel/syscall.c:142 > do_el0_svc+0x48/0x164 arch/arm64/kernel/syscall.c:206 > el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:624 > el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:642 > el0t_64_sync+0x18c/0x190 > Code: 79000688 52a00417 17ffff83 f9401288 (f9400508) > ---[ end trace 0000000000000000 ]--- > ---------------- > Code disassembly (best guess): > 0: 79000688 strh w8, [x20, #2] > 4: 52a00417 mov w23, #0x200000 // #2097152 > 8: 17ffff83 b 0xfffffffffffffe14 > c: f9401288 ldr x8, [x20, #32] > * 10: f9400508 ldr x8, [x8, #8] <-- trapping instruction > > > --- > 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 syzkaller@xxxxxxxxxxxxxxxx. > > syzbot will keep track of this issue. See: > https://goo.gl/tpsmEJ#status for how to communicate with syzbot. > syzbot can test patches for this issue, for details see: > https://goo.gl/tpsmEJ#testing-patches Cheers, Andreas
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