Revision 0b8c0ec7eedcd8f9f1a1f238d87f9b512b09e71a authored by Jens Axboe on 02 December 2019, 15:50:00 UTC, committed by Jens Axboe on 02 December 2019, 15:50:00 UTC
syzbot reports:
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 9217 Comm: io_uring-sq Not tainted 5.4.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
RIP: 0010:creds_are_invalid kernel/cred.c:792 [inline]
RIP: 0010:__validate_creds include/linux/cred.h:187 [inline]
RIP: 0010:override_creds+0x9f/0x170 kernel/cred.c:550
Code: ac 25 00 81 fb 64 65 73 43 0f 85 a3 37 00 00 e8 17 ab 25 00 49 8d 7c
24 10 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84
c0 74 08 3c 03 0f 8e 96 00 00 00 41 8b 5c 24 10 bf
RSP: 0018:ffff88809c45fda0 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000043736564 RCX: ffffffff814f3318
RDX: 0000000000000002 RSI: ffffffff814f3329 RDI: 0000000000000010
RBP: ffff88809c45fdb8 R08: ffff8880a3aac240 R09: ffffed1014755849
R10: ffffed1014755848 R11: ffff8880a3aac247 R12: 0000000000000000
R13: ffff888098ab1600 R14: 0000000000000000 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffd51c40664 CR3: 0000000092641000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
io_sq_thread+0x1c7/0xa20 fs/io_uring.c:3274
kthread+0x361/0x430 kernel/kthread.c:255
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
Modules linked in:
---[ end trace f2e1a4307fbe2245 ]---
RIP: 0010:creds_are_invalid kernel/cred.c:792 [inline]
RIP: 0010:__validate_creds include/linux/cred.h:187 [inline]
RIP: 0010:override_creds+0x9f/0x170 kernel/cred.c:550
Code: ac 25 00 81 fb 64 65 73 43 0f 85 a3 37 00 00 e8 17 ab 25 00 49 8d 7c
24 10 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84
c0 74 08 3c 03 0f 8e 96 00 00 00 41 8b 5c 24 10 bf
RSP: 0018:ffff88809c45fda0 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000043736564 RCX: ffffffff814f3318
RDX: 0000000000000002 RSI: ffffffff814f3329 RDI: 0000000000000010
RBP: ffff88809c45fdb8 R08: ffff8880a3aac240 R09: ffffed1014755849
R10: ffffed1014755848 R11: ffff8880a3aac247 R12: 0000000000000000
R13: ffff888098ab1600 R14: 0000000000000000 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffd51c40664 CR3: 0000000092641000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
which is caused by slab fault injection triggering a failure in
prepare_creds(). We don't actually need to create a copy of the creds
as we're not modifying it, we just need a reference on the current task
creds. This avoids the failure case as well, and propagates the const
throughout the stack.
Fixes: 181e448d8709 ("io_uring: async workers should inherit the user creds")
Reported-by: syzbot+5320383e16029ba057ff@syzkaller.appspotmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
1 parent 72c0870
| File | Mode | Size |
|---|---|---|
| 9p | ||
| adfs | ||
| affs | ||
| afs | ||
| autofs | ||
| befs | ||
| bfs | ||
| btrfs | ||
| cachefiles | ||
| ceph | ||
| cifs | ||
| coda | ||
| configfs | ||
| cramfs | ||
| crypto | ||
| debugfs | ||
| devpts | ||
| dlm | ||
| ecryptfs | ||
| efivarfs | ||
| efs | ||
| erofs | ||
| exportfs | ||
| ext2 | ||
| ext4 | ||
| f2fs | ||
| fat | ||
| freevxfs | ||
| fscache | ||
| fuse | ||
| gfs2 | ||
| hfs | ||
| hfsplus | ||
| hostfs | ||
| hpfs | ||
| hugetlbfs | ||
| iomap | ||
| isofs | ||
| jbd2 | ||
| jffs2 | ||
| jfs | ||
| kernfs | ||
| lockd | ||
| minix | ||
| nfs | ||
| nfs_common | ||
| nfsd | ||
| nilfs2 | ||
| nls | ||
| notify | ||
| ntfs | ||
| ocfs2 | ||
| omfs | ||
| openpromfs | ||
| orangefs | ||
| overlayfs | ||
| proc | ||
| pstore | ||
| qnx4 | ||
| qnx6 | ||
| quota | ||
| ramfs | ||
| reiserfs | ||
| romfs | ||
| squashfs | ||
| sysfs | ||
| sysv | ||
| tracefs | ||
| ubifs | ||
| udf | ||
| ufs | ||
| unicode | ||
| verity | ||
| xfs | ||
| Kconfig | -rw-r--r-- | 7.6 KB |
| Kconfig.binfmt | -rw-r--r-- | 7.6 KB |
| Makefile | -rw-r--r-- | 4.4 KB |
| aio.c | -rw-r--r-- | 56.0 KB |
| anon_inodes.c | -rw-r--r-- | 4.6 KB |
| attr.c | -rw-r--r-- | 9.6 KB |
| bad_inode.c | -rw-r--r-- | 5.3 KB |
| binfmt_aout.c | -rw-r--r-- | 8.3 KB |
| binfmt_elf.c | -rw-r--r-- | 63.1 KB |
| binfmt_elf_fdpic.c | -rw-r--r-- | 47.2 KB |
| binfmt_em86.c | -rw-r--r-- | 2.8 KB |
| binfmt_flat.c | -rw-r--r-- | 28.0 KB |
| binfmt_misc.c | -rw-r--r-- | 18.5 KB |
| binfmt_script.c | -rw-r--r-- | 4.4 KB |
| block_dev.c | -rw-r--r-- | 56.5 KB |
| buffer.c | -rw-r--r-- | 91.1 KB |
| char_dev.c | -rw-r--r-- | 16.5 KB |
| compat.c | -rw-r--r-- | 3.2 KB |
| compat_binfmt_elf.c | -rw-r--r-- | 3.3 KB |
| compat_ioctl.c | -rw-r--r-- | 6.1 KB |
| coredump.c | -rw-r--r-- | 22.1 KB |
| d_path.c | -rw-r--r-- | 11.3 KB |
| dax.c | -rw-r--r-- | 46.0 KB |
| dcache.c | -rw-r--r-- | 83.9 KB |
| dcookies.c | -rw-r--r-- | 7.1 KB |
| direct-io.c | -rw-r--r-- | 40.8 KB |
| drop_caches.c | -rw-r--r-- | 1.8 KB |
| eventfd.c | -rw-r--r-- | 11.1 KB |
| eventpoll.c | -rw-r--r-- | 64.5 KB |
| exec.c | -rw-r--r-- | 46.9 KB |
| fcntl.c | -rw-r--r-- | 23.3 KB |
| fhandle.c | -rw-r--r-- | 6.8 KB |
| file.c | -rw-r--r-- | 24.2 KB |
| file_table.c | -rw-r--r-- | 10.2 KB |
| filesystems.c | -rw-r--r-- | 6.4 KB |
| fs-writeback.c | -rw-r--r-- | 74.6 KB |
| fs_context.c | -rw-r--r-- | 18.1 KB |
| fs_parser.c | -rw-r--r-- | 11.0 KB |
| fs_pin.c | -rw-r--r-- | 1.9 KB |
| fs_struct.c | -rw-r--r-- | 3.3 KB |
| fs_types.c | -rw-r--r-- | 2.5 KB |
| fsopen.c | -rw-r--r-- | 11.2 KB |
| inode.c | -rw-r--r-- | 60.7 KB |
| internal.h | -rw-r--r-- | 5.1 KB |
| io-wq.c | -rw-r--r-- | 26.0 KB |
| io-wq.h | -rw-r--r-- | 3.0 KB |
| io_uring.c | -rw-r--r-- | 118.9 KB |
| ioctl.c | -rw-r--r-- | 19.6 KB |
| libfs.c | -rw-r--r-- | 32.9 KB |
| locks.c | -rw-r--r-- | 78.9 KB |
| mbcache.c | -rw-r--r-- | 12.0 KB |
| mount.h | -rw-r--r-- | 4.0 KB |
| mpage.c | -rw-r--r-- | 21.1 KB |
| namei.c | -rw-r--r-- | 123.0 KB |
| namespace.c | -rw-r--r-- | 97.0 KB |
| no-block.c | -rw-r--r-- | 478 bytes |
| nsfs.c | -rw-r--r-- | 6.1 KB |
| open.c | -rw-r--r-- | 30.2 KB |
| pipe.c | -rw-r--r-- | 29.0 KB |
| pnode.c | -rw-r--r-- | 15.1 KB |
| pnode.h | -rw-r--r-- | 1.9 KB |
| posix_acl.c | -rw-r--r-- | 21.5 KB |
| proc_namespace.c | -rw-r--r-- | 7.8 KB |
| read_write.c | -rw-r--r-- | 51.6 KB |
| readdir.c | -rw-r--r-- | 13.3 KB |
| select.c | -rw-r--r-- | 34.3 KB |
| seq_file.c | -rw-r--r-- | 24.7 KB |
| signalfd.c | -rw-r--r-- | 9.0 KB |
| splice.c | -rw-r--r-- | 41.4 KB |
| stack.c | -rw-r--r-- | 2.5 KB |
| stat.c | -rw-r--r-- | 19.4 KB |
| statfs.c | -rw-r--r-- | 9.6 KB |
| super.c | -rw-r--r-- | 47.9 KB |
| sync.c | -rw-r--r-- | 10.4 KB |
| timerfd.c | -rw-r--r-- | 13.5 KB |
| userfaultfd.c | -rw-r--r-- | 51.2 KB |
| utimes.c | -rw-r--r-- | 7.4 KB |
| xattr.c | -rw-r--r-- | 23.5 KB |
Computing file changes ...
