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SubjectRe: [PATCH] dax: general protection fault in dax_alloc_inode
On Tue, Nov 14, 2017 at 6:59 AM, Mikulas Patocka <mpatocka@redhat.com> wrote:
>
>
> On Tue, 14 Nov 2017, syzbot wrote:
>
>> Hello,
>>
>> syzkaller hit the following crash on e4880bc5dfb1f02b152e62a894b5c6f3e995b3cf
>> git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/master
>> compiler: gcc (GCC) 7.1.1 20170620
>> .config is attached
>> Raw console output is attached.
>>
>> Unfortunately, I don't have any reproducer for this bug yet.
>>
>>
>> RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
>> R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
>> R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
>> kasan: CONFIG_KASAN_INLINE enabled
>> kasan: GPF could be caused by NULL-ptr deref or user memory access
>> general protection fault: 0000 [#1] SMP KASAN
>> Dumping ftrace buffer:
>> (ftrace buffer empty)
>> Modules linked in:
>> CPU: 1 PID: 31095 Comm: syz-executor3 Not tainted 4.14.0-rc8+ #75
>> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google
>> 01/01/2011
>> task: ffff8801cae96000 task.stack: ffff8801d2438000
>> RIP: 0010:dax_alloc_inode+0x3b/0x70 drivers/dax/super.c:348
>> RSP: 0018:ffff8801d243f8d0 EFLAGS: 00010203
>> RAX: 0000000000000010 RBX: 0000000000000000 RCX: 000000000000000b
>> RDX: dffffc0000000000 RSI: ffffffff85b34340 RDI: 000000000000005c
>> RBP: ffff8801d243f8e0 R08: 0000000000000001 R09: 0000000000000000
>> R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff83595ba0
>> R13: dffffc0000000000 R14: ffff8801cedbc5c0 R15: 0000000064646178
>> FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:00000000f7742b40
>> CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033
>> CR2: 00000000f778cdb0 CR3: 00000001c5739000 CR4: 00000000001406e0
>> DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000
>> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
>> Call Trace:
>> alloc_inode+0x65/0x180 fs/inode.c:208
>> new_inode_pseudo+0x69/0x190 fs/inode.c:890
>> new_inode+0x1c/0x40 fs/inode.c:919
>> mount_pseudo_xattr+0x288/0x560 fs/libfs.c:261
>> mount_pseudo include/linux/fs.h:2137 [inline]
>> dax_mount+0x2e/0x40 drivers/dax/super.c:388
>> mount_fs+0x66/0x2d0 fs/super.c:1223
>> vfs_kern_mount.part.26+0xc6/0x4a0 fs/namespace.c:1037
>> vfs_kern_mount fs/namespace.c:2509 [inline]
>> do_new_mount fs/namespace.c:2512 [inline]
>> do_mount+0xea1/0x2bb0 fs/namespace.c:2841
>> C_SYSC_mount fs/compat.c:195 [inline]
>> compat_SyS_mount+0xd0/0x1070 fs/compat.c:160
>> do_syscall_32_irqs_on arch/x86/entry/common.c:329 [inline]
>> do_fast_syscall_32+0x3f2/0xf05 arch/x86/entry/common.c:391
>> entry_SYSENTER_compat+0x51/0x60 arch/x86/entry/entry_64_compat.S:125
>> RIP: 0023:0xf7f46c79
>> RSP: 002b:00000000f774201c EFLAGS: 00000296 ORIG_RAX: 0000000000000015
>> RAX: ffffffffffffffda RBX: 0000000020907ff8 RCX: 0000000020058ffd
>> RDX: 0000000020c77ffa RSI: 0000000000000000 RDI: 0000000020de9000
>> RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
>> R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
>> R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
>> Code: 3d eb ad c1 02 be c0 00 40 01 e8 21 d2 48 fe 48 89 c3 48 ba 00 00 00 00
>> 00 fc ff df 48 83 c0 10 48 8d 7b 5c 48 89 f9 48 c1 e9 03 <0f> b6 0c 11 48 89
>> fa 83 e2 07 83 c2 03 38 ca 7c 04 84 c9 75 0e
>> RIP: dax_alloc_inode+0x3b/0x70 drivers/dax/super.c:348 RSP: ffff8801d243f8d0
>> ---[ end trace 543b2dab980d72b6 ]---
>>
>>
>> ---
>> This bug is generated by a dumb bot. It may contain errors.
>> See https://goo.gl/tpsmEJ for details.
>> Direct all questions to syzkaller@googlegroups.com.
>> Please credit me with: Reported-by: syzbot <syzkaller@googlegroups.com>
>>
>> syzbot will keep track of this bug report.
>> Once a fix for this bug is committed, please reply to this email with:
>> #syz fix: exact-commit-title
>> To mark this as a duplicate of another syzbot report, please reply with:
>> #syz dup: exact-subject-of-another-report
>> If it's a one-off invalid bug report, please reply with:
>> #syz invalid
>> Note: if the crash happens again, it will cause creation of a new bug report.
>> Note: all commands must start from beginning of the line in the email body.
>
> Don't crash in case of allocation failure in dax_alloc_inode.
>
> Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
> Cc: stable@vger.kernel.org # v4.12+

Thanks Mikulas, I like to include a "Fixes" tag, I'll add that when applying.

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