[Android 5.10] general protection fault in open_or_create_special_dir
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syzbot
Mar 16, 2024, 3:55:19 AMMar 16
to syzkaller-a...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: dd976ecce2ce Merge "Merge branch 'android13-5.10' into bra..
git tree: android13-5.10-lts
console+strace: https://syzkaller.appspot.com/x/log.txt?x=139731be180000
kernel config: https://syzkaller.appspot.com/x/.config?x=1a6e39f6bdc97aed
dashboard link: https://syzkaller.appspot.com/bug?extid=0908b298a1b37b13d328
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=102e8711180000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=164f5185180000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/b9c3af53cbe0/disk-dd976ecc.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/3392bdfedef3/vmlinux-dd976ecc.xz
kernel image: https://storage.googleapis.com/syzbot-assets/8b33fe3a1fcc/bzImage-dd976ecc.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+0908b2...@syzkaller.appspotmail.com
general protection fault, probably for non-canonical address 0xdffffc0000000007: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000038-0x000000000000003f]
CPU: 1 PID: 305 Comm: syz-executor115 Not tainted 5.10.209-syzkaller-00435-gdd976ecce2ce #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
RIP: 0010:d_really_is_positive include/linux/dcache.h:499 [inline]
RIP: 0010:open_or_create_special_dir+0x89/0x1d0 fs/incfs/vfs.c:453
Code: e8 bc 2d 60 ff e9 00 01 00 00 e8 b2 2d 60 ff 48 c7 c3 ea ff ff ff e9 ef 00 00 00 4c 89 6d d0 4c 8d 6b 30 4d 89 ef 49 c1 ef 03 <43> 80 3c 37 00 74 08 4c 89 ef e8 88 a6 9d ff 49 83 7d 00 00 74 26
RSP: 0018:ffffc90000c97ab8 EFLAGS: 00010202
RAX: 0000000000000008 RBX: 0000000000000008 RCX: ffff88811f5a13c0
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff88811c53a920
RBP: ffffc90000c97af0 R08: dffffc0000000000 R09: ffffed10238a7525
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff88811c53a880
R13: 0000000000000038 R14: dffffc0000000000 R15: 0000000000000007
FS: 00007f303195a6c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020008fc0 CR3: 000000011f11e000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
incfs_mount_fs+0x48d/0xa10 fs/incfs/vfs.c:1839
legacy_get_tree+0xf1/0x190 fs/fs_context.c:593
vfs_get_tree+0x88/0x290 fs/super.c:1559
do_new_mount+0x2ba/0xb30 fs/namespace.c:2910
path_mount+0x56f/0xcb0 fs/namespace.c:3240
do_mount fs/namespace.c:3253 [inline]
__do_sys_mount fs/namespace.c:3461 [inline]
__se_sys_mount+0x2c4/0x3b0 fs/namespace.c:3438
__x64_sys_mount+0xbf/0xd0 fs/namespace.c:3438
do_syscall_64+0x34/0x70
entry_SYSCALL_64_after_hwframe+0x61/0xc6
RIP: 0033:0x7f30319c5d39
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 91 1b 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f303195a218 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f3031a483f8 RCX: 00007f30319c5d39
RDX: 0000000020000180 RSI: 00000000200000c0 RDI: 0000000020000080
RBP: 00007f3031a483f0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f3031a1516c
R13: 0030656c69662f2e R14: 00007ffecda1aa80 R15: 00007f3031a15184
Modules linked in:
---[ end trace 19f272d91af410a2 ]---
RIP: 0010:d_really_is_positive include/linux/dcache.h:499 [inline]
RIP: 0010:open_or_create_special_dir+0x89/0x1d0 fs/incfs/vfs.c:453
Code: e8 bc 2d 60 ff e9 00 01 00 00 e8 b2 2d 60 ff 48 c7 c3 ea ff ff ff e9 ef 00 00 00 4c 89 6d d0 4c 8d 6b 30 4d 89 ef 49 c1 ef 03 <43> 80 3c 37 00 74 08 4c 89 ef e8 88 a6 9d ff 49 83 7d 00 00 74 26
RSP: 0018:ffffc90000c97ab8 EFLAGS: 00010202
RAX: 0000000000000008 RBX: 0000000000000008 RCX: ffff88811f5a13c0
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff88811c53a920
RBP: ffffc90000c97af0 R08: dffffc0000000000 R09: ffffed10238a7525
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff88811c53a880
R13: 0000000000000038 R14: dffffc0000000000 R15: 0000000000000007
FS: 00007f303195a6c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020008fc0 CR3: 000000011f11e000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: e8 bc 2d 60 ff call 0xff602dc1
5: e9 00 01 00 00 jmp 0x10a
a: e8 b2 2d 60 ff call 0xff602dc1
f: 48 c7 c3 ea ff ff ff mov $0xffffffffffffffea,%rbx
16: e9 ef 00 00 00 jmp 0x10a
1b: 4c 89 6d d0 mov %r13,-0x30(%rbp)
1f: 4c 8d 6b 30 lea 0x30(%rbx),%r13
23: 4d 89 ef mov %r13,%r15
26: 49 c1 ef 03 shr $0x3,%r15
* 2a: 43 80 3c 37 00 cmpb $0x0,(%r15,%r14,1) <-- trapping instruction
2f: 74 08 je 0x39
31: 4c 89 ef mov %r13,%rdi
34: e8 88 a6 9d ff call 0xff9da6c1
39: 49 83 7d 00 00 cmpq $0x0,0x0(%r13)
3e: 74 26 je 0x66
---
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 syzk...@googlegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.
If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)
If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report
If you want to undo deduplication, reply with:
#syz undup
syzbot found the following issue on:
HEAD commit: dd976ecce2ce Merge "Merge branch 'android13-5.10' into bra..
git tree: android13-5.10-lts
console+strace: https://syzkaller.appspot.com/x/log.txt?x=139731be180000
kernel config: https://syzkaller.appspot.com/x/.config?x=1a6e39f6bdc97aed
dashboard link: https://syzkaller.appspot.com/bug?extid=0908b298a1b37b13d328
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=102e8711180000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=164f5185180000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/b9c3af53cbe0/disk-dd976ecc.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/3392bdfedef3/vmlinux-dd976ecc.xz
kernel image: https://storage.googleapis.com/syzbot-assets/8b33fe3a1fcc/bzImage-dd976ecc.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+0908b2...@syzkaller.appspotmail.com
general protection fault, probably for non-canonical address 0xdffffc0000000007: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000038-0x000000000000003f]
CPU: 1 PID: 305 Comm: syz-executor115 Not tainted 5.10.209-syzkaller-00435-gdd976ecce2ce #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
RIP: 0010:d_really_is_positive include/linux/dcache.h:499 [inline]
RIP: 0010:open_or_create_special_dir+0x89/0x1d0 fs/incfs/vfs.c:453
Code: e8 bc 2d 60 ff e9 00 01 00 00 e8 b2 2d 60 ff 48 c7 c3 ea ff ff ff e9 ef 00 00 00 4c 89 6d d0 4c 8d 6b 30 4d 89 ef 49 c1 ef 03 <43> 80 3c 37 00 74 08 4c 89 ef e8 88 a6 9d ff 49 83 7d 00 00 74 26
RSP: 0018:ffffc90000c97ab8 EFLAGS: 00010202
RAX: 0000000000000008 RBX: 0000000000000008 RCX: ffff88811f5a13c0
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff88811c53a920
RBP: ffffc90000c97af0 R08: dffffc0000000000 R09: ffffed10238a7525
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff88811c53a880
R13: 0000000000000038 R14: dffffc0000000000 R15: 0000000000000007
FS: 00007f303195a6c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020008fc0 CR3: 000000011f11e000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
incfs_mount_fs+0x48d/0xa10 fs/incfs/vfs.c:1839
legacy_get_tree+0xf1/0x190 fs/fs_context.c:593
vfs_get_tree+0x88/0x290 fs/super.c:1559
do_new_mount+0x2ba/0xb30 fs/namespace.c:2910
path_mount+0x56f/0xcb0 fs/namespace.c:3240
do_mount fs/namespace.c:3253 [inline]
__do_sys_mount fs/namespace.c:3461 [inline]
__se_sys_mount+0x2c4/0x3b0 fs/namespace.c:3438
__x64_sys_mount+0xbf/0xd0 fs/namespace.c:3438
do_syscall_64+0x34/0x70
entry_SYSCALL_64_after_hwframe+0x61/0xc6
RIP: 0033:0x7f30319c5d39
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 91 1b 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f303195a218 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f3031a483f8 RCX: 00007f30319c5d39
RDX: 0000000020000180 RSI: 00000000200000c0 RDI: 0000000020000080
RBP: 00007f3031a483f0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f3031a1516c
R13: 0030656c69662f2e R14: 00007ffecda1aa80 R15: 00007f3031a15184
Modules linked in:
---[ end trace 19f272d91af410a2 ]---
RIP: 0010:d_really_is_positive include/linux/dcache.h:499 [inline]
RIP: 0010:open_or_create_special_dir+0x89/0x1d0 fs/incfs/vfs.c:453
Code: e8 bc 2d 60 ff e9 00 01 00 00 e8 b2 2d 60 ff 48 c7 c3 ea ff ff ff e9 ef 00 00 00 4c 89 6d d0 4c 8d 6b 30 4d 89 ef 49 c1 ef 03 <43> 80 3c 37 00 74 08 4c 89 ef e8 88 a6 9d ff 49 83 7d 00 00 74 26
RSP: 0018:ffffc90000c97ab8 EFLAGS: 00010202
RAX: 0000000000000008 RBX: 0000000000000008 RCX: ffff88811f5a13c0
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff88811c53a920
RBP: ffffc90000c97af0 R08: dffffc0000000000 R09: ffffed10238a7525
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff88811c53a880
R13: 0000000000000038 R14: dffffc0000000000 R15: 0000000000000007
FS: 00007f303195a6c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020008fc0 CR3: 000000011f11e000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: e8 bc 2d 60 ff call 0xff602dc1
5: e9 00 01 00 00 jmp 0x10a
a: e8 b2 2d 60 ff call 0xff602dc1
f: 48 c7 c3 ea ff ff ff mov $0xffffffffffffffea,%rbx
16: e9 ef 00 00 00 jmp 0x10a
1b: 4c 89 6d d0 mov %r13,-0x30(%rbp)
1f: 4c 8d 6b 30 lea 0x30(%rbx),%r13
23: 4d 89 ef mov %r13,%r15
26: 49 c1 ef 03 shr $0x3,%r15
* 2a: 43 80 3c 37 00 cmpb $0x0,(%r15,%r14,1) <-- trapping instruction
2f: 74 08 je 0x39
31: 4c 89 ef mov %r13,%rdi
34: e8 88 a6 9d ff call 0xff9da6c1
39: 49 83 7d 00 00 cmpq $0x0,0x0(%r13)
3e: 74 26 je 0x66
---
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 syzk...@googlegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.
If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)
If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report
If you want to undo deduplication, reply with:
#syz undup
syzbot
Mar 16, 2024, 4:27:16 AMMar 16
to syzkaller-a...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: 993bed180178 Merge "Merge branch 'android13-5.15' into bra..
syzbot found the following issue on:
git tree: android13-5.15-lts
console+strace: https://syzkaller.appspot.com/x/log.txt?x=15126711180000
kernel config: https://syzkaller.appspot.com/x/.config?x=49ce29477ba81e8f
dashboard link: https://syzkaller.appspot.com/bug?extid=0adbb066671e40ff6805
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12c75ef1180000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12b4324e180000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/4098d24d4c8b/disk-993bed18.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/94fbc07ac02d/vmlinux-993bed18.xz
kernel image: https://storage.googleapis.com/syzbot-assets/eed14de06c19/bzImage-993bed18.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
general protection fault, probably for non-canonical address 0xdffffc0000000007: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000038-0x000000000000003f]
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
RIP: 0010:d_really_is_positive include/linux/dcache.h:503 [inline]
RIP: 0010:open_or_create_special_dir+0x89/0x1d0 fs/incfs/vfs.c:459
Code: e8 3c ce 59 ff e9 07 01 00 00 e8 32 ce 59 ff 48 c7 c3 ea ff ff ff e9 f6 00 00 00 4c 89 6d d0 4c 8d 6b 30 4d 89 ef 49 c1 ef 03 <43> 80 3c 37 00 74 08 4c 89 ef e8 a8 de 9b ff 49 83 7d 00 00 74 26
RSP: 0018:ffffc90000b07a98 EFLAGS: 00010202
RAX: 0000000000000008 RBX: 0000000000000008 RCX: ffff88811f283b40
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff88811ee113e8
RBP: ffffc90000b07ad0 R08: dffffc0000000000 R09: ffffed1023dc227e
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff88811c0b4900
R13: 0000000000000038 R14: dffffc0000000000 R15: 0000000000000007
FS: 00007fe2ab8c36c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020008fc0 CR3: 000000011ee83000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
incfs_mount_fs+0x49b/0xa30 fs/incfs/vfs.c:1856
legacy_get_tree+0xf1/0x190 fs/fs_context.c:611
vfs_get_tree+0x88/0x290 fs/super.c:1517
do_new_mount+0x2ba/0xb30 fs/namespace.c:3005
path_mount+0x671/0x1070 fs/namespace.c:3335
do_mount fs/namespace.c:3348 [inline]
__do_sys_mount fs/namespace.c:3556 [inline]
__se_sys_mount+0x2c4/0x3b0 fs/namespace.c:3533
__x64_sys_mount+0xbf/0xd0 fs/namespace.c:3533
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7fe2ab926b49
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 81 18 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fe2ab8c3218 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fe2ab9b03f8 RCX: 00007fe2ab926b49
RDX: 0000000020000180 RSI: 00000000200000c0 RDI: 0000000020000080
RBP: 00007fe2ab9b03f0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fe2ab97d0bc
R13: 0030656c69662f2e R14: 00007fff6e7d5530 R15: 00007fe2ab97d0d4
</TASK>
Modules linked in:
---[ end trace b74d8b1343349fec ]---
RIP: 0010:d_really_is_positive include/linux/dcache.h:503 [inline]
RIP: 0010:open_or_create_special_dir+0x89/0x1d0 fs/incfs/vfs.c:459
Code: e8 3c ce 59 ff e9 07 01 00 00 e8 32 ce 59 ff 48 c7 c3 ea ff ff ff e9 f6 00 00 00 4c 89 6d d0 4c 8d 6b 30 4d 89 ef 49 c1 ef 03 <43> 80 3c 37 00 74 08 4c 89 ef e8 a8 de 9b ff 49 83 7d 00 00 74 26
RSP: 0018:ffffc90000b07a98 EFLAGS: 00010202
RAX: 0000000000000008 RBX: 0000000000000008 RCX: ffff88811f283b40
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff88811ee113e8
RBP: ffffc90000b07ad0 R08: dffffc0000000000 R09: ffffed1023dc227e
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff88811c0b4900
R13: 0000000000000038 R14: dffffc0000000000 R15: 0000000000000007
FS: 00007fe2ab8c36c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fff6e7d55f8 CR3: 000000011ee83000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: e8 3c ce 59 ff call 0xff59ce41
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
5: e9 07 01 00 00 jmp 0x111
a: e8 32 ce 59 ff call 0xff59ce41
f: 48 c7 c3 ea ff ff ff mov $0xffffffffffffffea,%rbx
16: e9 f6 00 00 00 jmp 0x111
1b: 4c 89 6d d0 mov %r13,-0x30(%rbp)
1f: 4c 8d 6b 30 lea 0x30(%rbx),%r13
23: 4d 89 ef mov %r13,%r15
26: 49 c1 ef 03 shr $0x3,%r15
* 2a: 43 80 3c 37 00 cmpb $0x0,(%r15,%r14,1) <-- trapping instruction
2f: 74 08 je 0x39
31: 4c 89 ef mov %r13,%rdi
34: e8 a8 de 9b ff call 0xff9bdee1
1f: 4c 8d 6b 30 lea 0x30(%rbx),%r13
23: 4d 89 ef mov %r13,%r15
26: 49 c1 ef 03 shr $0x3,%r15
* 2a: 43 80 3c 37 00 cmpb $0x0,(%r15,%r14,1) <-- trapping instruction
2f: 74 08 je 0x39
31: 4c 89 ef mov %r13,%rdi
syzbot
Mar 16, 2024, 4:33:22 AMMar 16
to syzkaller-a...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: ef39f76e4d24 ANDROID: fuse-bpf: Fix readdir for getdents
syzbot found the following issue on:
git tree: android14-6.1
console+strace: https://syzkaller.appspot.com/x/log.txt?x=11efa6be180000
kernel config: https://syzkaller.appspot.com/x/.config?x=54c503ca94c7e582
dashboard link: https://syzkaller.appspot.com/bug?extid=05dfbbbd5e79d4226531
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=164d3ffa180000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16ed8aa5180000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/0fe8fca0e36e/disk-ef39f76e.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/41843137ff8d/vmlinux-ef39f76e.xz
kernel image: https://storage.googleapis.com/syzbot-assets/84e78b316b8e/bzImage-ef39f76e.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
general protection fault, probably for non-canonical address 0xdffffc0000000007: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000038-0x000000000000003f]
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
RIP: 0010:d_really_is_positive include/linux/dcache.h:493 [inline]
RIP: 0010:open_or_create_special_dir+0x89/0x1d0 fs/incfs/vfs.c:459
Code: e8 ac a0 52 ff e9 07 01 00 00 e8 a2 a0 52 ff 48 c7 c3 ea ff ff ff e9 f6 00 00 00 4c 89 6d d0 4c 8d 6b 30 4d 89 ef 49 c1 ef 03 <43> 80 3c 37 00 74 08 4c 89 ef e8 18 74 99 ff 49 83 7d 00 00 74 26
RSP: 0018:ffffc90000f37a78 EFLAGS: 00010202
RAX: 0000000000000008 RBX: 0000000000000008 RCX: ffff888109b66540
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff888109b61468
RBP: ffffc90000f37ab0 R08: dffffc0000000000 R09: ffffed102136c28e
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff88810ee95980
R13: 0000000000000038 R14: dffffc0000000000 R15: 0000000000000007
FS: 00007fbff9fc46c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020008fc0 CR3: 000000012227e000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
<TASK>
incfs_mount_fs+0x49b/0xa30 fs/incfs/vfs.c:1857
legacy_get_tree+0xf1/0x190 fs/fs_context.c:632
vfs_get_tree+0x88/0x290 fs/super.c:1564
do_new_mount+0x28b/0xad0 fs/namespace.c:3040
path_mount+0x671/0x1070 fs/namespace.c:3370
do_mount fs/namespace.c:3383 [inline]
__do_sys_mount fs/namespace.c:3591 [inline]
__se_sys_mount+0x2c4/0x3b0 fs/namespace.c:3568
__x64_sys_mount+0xbf/0xd0 fs/namespace.c:3568
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fbffa027b49
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 81 18 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fbff9fc4218 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fbffa0b13f8 RCX: 00007fbffa027b49
RDX: 0000000020000180 RSI: 00000000200000c0 RDI: 0000000020000080
RBP: 00007fbffa0b13f0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fbffa07e0bc
R13: 0030656c69662f2e R14: 00007ffccaee8930 R15: 00007fbffa07e0d4
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:d_really_is_positive include/linux/dcache.h:493 [inline]
RIP: 0010:open_or_create_special_dir+0x89/0x1d0 fs/incfs/vfs.c:459
Code: e8 ac a0 52 ff e9 07 01 00 00 e8 a2 a0 52 ff 48 c7 c3 ea ff ff ff e9 f6 00 00 00 4c 89 6d d0 4c 8d 6b 30 4d 89 ef 49 c1 ef 03 <43> 80 3c 37 00 74 08 4c 89 ef e8 18 74 99 ff 49 83 7d 00 00 74 26
RSP: 0018:ffffc90000f37a78 EFLAGS: 00010202
RAX: 0000000000000008 RBX: 0000000000000008 RCX: ffff888109b66540
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff888109b61468
RBP: ffffc90000f37ab0 R08: dffffc0000000000 R09: ffffed102136c28e
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff88810ee95980
R13: 0000000000000038 R14: dffffc0000000000 R15: 0000000000000007
FS: 00007fbff9fc46c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005647a1e670e8 CR3: 000000012227e000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: e8 ac a0 52 ff call 0xff52a0b1
Code disassembly (best guess):
5: e9 07 01 00 00 jmp 0x111
a: e8 a2 a0 52 ff call 0xff52a0b1
f: 48 c7 c3 ea ff ff ff mov $0xffffffffffffffea,%rbx
16: e9 f6 00 00 00 jmp 0x111
1b: 4c 89 6d d0 mov %r13,-0x30(%rbp)
1f: 4c 8d 6b 30 lea 0x30(%rbx),%r13
23: 4d 89 ef mov %r13,%r15
26: 49 c1 ef 03 shr $0x3,%r15
* 2a: 43 80 3c 37 00 cmpb $0x0,(%r15,%r14,1) <-- trapping instruction
2f: 74 08 je 0x39
31: 4c 89 ef mov %r13,%rdi
34: e8 18 74 99 ff call 0xff997451
16: e9 f6 00 00 00 jmp 0x111
1b: 4c 89 6d d0 mov %r13,-0x30(%rbp)
1f: 4c 8d 6b 30 lea 0x30(%rbx),%r13
23: 4d 89 ef mov %r13,%r15
26: 49 c1 ef 03 shr $0x3,%r15
* 2a: 43 80 3c 37 00 cmpb $0x0,(%r15,%r14,1) <-- trapping instruction
2f: 74 08 je 0x39
31: 4c 89 ef mov %r13,%rdi
syzbot
Mar 16, 2024, 5:46:13 AMMar 16
to syzkaller-a...@googlegroups.com
Bug presence analysis results: the bug reproduces only on Android 6.1.
syzbot has run the reproducer on other relevant kernel trees and got
the following results:
android14-6.1 (commit ef39f76e4d24) on 2024/03/16:
general protection fault in open_or_create_special_dir
Report: https://syzkaller.appspot.com/x/report.txt?x=164d21f1180000
lts (commit 883d1a956208) on 2024/03/16:
Didn't crash.
upstream (commit 66a27abac311) on 2024/03/16:
Didn't crash.
More details can be found at:
https://syzkaller.appspot.com/bug?extid=05dfbbbd5e79d4226531
syzbot has run the reproducer on other relevant kernel trees and got
the following results:
android14-6.1 (commit ef39f76e4d24) on 2024/03/16:
general protection fault in open_or_create_special_dir
Report: https://syzkaller.appspot.com/x/report.txt?x=164d21f1180000
lts (commit 883d1a956208) on 2024/03/16:
Didn't crash.
upstream (commit 66a27abac311) on 2024/03/16:
Didn't crash.
More details can be found at:
https://syzkaller.appspot.com/bug?extid=05dfbbbd5e79d4226531
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