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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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e79a33270d
Originally, verify_dir_item verifies name_len of dir_item with fixed
values but not item boundary.
If corrupted name_len was not bigger than the fixed value, for example
255, the function will think the dir_item is fine. And then reading
beyond boundary will cause crash.
Example:
1. Corrupt one dir_item name_len to be 255.
2. Run 'ls -lar /mnt/test/ > /dev/null'
dmesg:
[ 48.451449] BTRFS info (device vdb1): disk space caching is enabled
[ 48.451453] BTRFS info (device vdb1): has skinny extents
[ 48.489420] general protection fault: 0000 [#1] SMP
[ 48.489571] Modules linked in: ext4 jbd2 mbcache btrfs xor raid6_pq
[ 48.489716] CPU: 1 PID: 2710 Comm: ls Not tainted 4.10.0-rc1 #5
[ 48.489853] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.10.2-20170228_101828-anatol 04/01/2014
[ 48.490008] task: ffff880035df1bc0 task.stack: ffffc90004800000
[ 48.490008] RIP: 0010:read_extent_buffer+0xd2/0x190 [btrfs]
[ 48.490008] RSP: 0018:ffffc90004803d98 EFLAGS: 00010202
[ 48.490008] RAX: 000000000000001b RBX: 000000000000001b RCX: 0000000000000000
[ 48.490008] RDX: ffff880079dbf36c RSI: 0005080000000000 RDI: ffff880079dbf368
[ 48.490008] RBP: ffffc90004803dc8 R08: ffff880078e8cc48 R09: ffff880000000000
[ 48.490008] R10: 0000160000000000 R11: 0000000000001000 R12: ffff880079dbf288
[ 48.490008] R13: ffff880078e8ca88 R14: 0000000000000003 R15: ffffc90004803e20
[ 48.490008] FS: 00007fef50c60800(0000) GS:ffff88007d400000(0000) knlGS:0000000000000000
[ 48.490008] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 48.490008] CR2: 000055f335ac2ff8 CR3: 000000007356d000 CR4: 00000000001406e0
[ 48.490008] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 48.490008] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 48.490008] Call Trace:
[ 48.490008] btrfs_real_readdir+0x3b7/0x4a0 [btrfs]
[ 48.490008] iterate_dir+0x181/0x1b0
[ 48.490008] SyS_getdents+0xa7/0x150
[ 48.490008] ? fillonedir+0x150/0x150
[ 48.490008] entry_SYSCALL_64_fastpath+0x18/0xad
[ 48.490008] RIP: 0033:0x7fef5032546b
[ 48.490008] RSP: 002b:00007ffeafcdb830 EFLAGS: 00000206 ORIG_RAX: 000000000000004e
[ 48.490008] RAX: ffffffffffffffda RBX: 00007fef5061db38 RCX: 00007fef5032546b
[ 48.490008] RDX: 0000000000008000 RSI: 000055f335abaff0 RDI: 0000000000000003
[ 48.490008] RBP: 00007fef5061dae0 R08: 00007fef5061db48 R09: 0000000000000000
[ 48.490008] R10: 000055f335abafc0 R11: 0000000000000206 R12: 00007fef5061db38
[ 48.490008] R13: 0000000000008040 R14: 00007fef5061db38 R15: 000000000000270e
[ 48.490008] RIP: read_extent_buffer+0xd2/0x190 [btrfs] RSP: ffffc90004803d98
[ 48.499455] ---[ end trace 321920d8e8339505 ]---
Fix it by adding a parameter @slot and check name_len with item boundary
by calling btrfs_is_name_len_valid.
Signed-off-by: Su Yue <suy.fnst@cn.fujitsu.com>
rev
Signed-off-by: David Sterba <dsterba@suse.com>
|
||
|---|---|---|
| .. | ||
| 9p | ||
| adfs | ||
| affs | ||
| afs | ||
| autofs4 | ||
| befs | ||
| bfs | ||
| btrfs | ||
| cachefiles | ||
| ceph | ||
| cifs | ||
| coda | ||
| configfs | ||
| cramfs | ||
| crypto | ||
| debugfs | ||
| devpts | ||
| dlm | ||
| ecryptfs | ||
| efivarfs | ||
| efs | ||
| exofs | ||
| exportfs | ||
| ext2 | ||
| ext4 | ||
| f2fs | ||
| fat | ||
| freevxfs | ||
| fscache | ||
| fuse | ||
| gfs2 | ||
| hfs | ||
| hfsplus | ||
| hostfs | ||
| hpfs | ||
| hugetlbfs | ||
| isofs | ||
| jbd2 | ||
| jffs2 | ||
| jfs | ||
| kernfs | ||
| lockd | ||
| minix | ||
| ncpfs | ||
| 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 | ||
| xfs | ||
| aio.c | ||
| anon_inodes.c | ||
| attr.c | ||
| bad_inode.c | ||
| binfmt_aout.c | ||
| binfmt_elf_fdpic.c | ||
| binfmt_elf.c | ||
| binfmt_em86.c | ||
| binfmt_flat.c | ||
| binfmt_misc.c | ||
| binfmt_script.c | ||
| block_dev.c | ||
| buffer.c | ||
| char_dev.c | ||
| compat_binfmt_elf.c | ||
| compat_ioctl.c | ||
| compat.c | ||
| coredump.c | ||
| dax.c | ||
| dcache.c | ||
| dcookies.c | ||
| direct-io.c | ||
| drop_caches.c | ||
| eventfd.c | ||
| eventpoll.c | ||
| exec.c | ||
| fcntl.c | ||
| fhandle.c | ||
| file_table.c | ||
| file.c | ||
| filesystems.c | ||
| fs_pin.c | ||
| fs_struct.c | ||
| fs-writeback.c | ||
| inode.c | ||
| internal.h | ||
| ioctl.c | ||
| iomap.c | ||
| Kconfig | ||
| Kconfig.binfmt | ||
| libfs.c | ||
| locks.c | ||
| Makefile | ||
| mbcache.c | ||
| mount.h | ||
| mpage.c | ||
| namei.c | ||
| namespace.c | ||
| no-block.c | ||
| nsfs.c | ||
| open.c | ||
| pipe.c | ||
| pnode.c | ||
| pnode.h | ||
| posix_acl.c | ||
| proc_namespace.c | ||
| read_write.c | ||
| readdir.c | ||
| select.c | ||
| seq_file.c | ||
| signalfd.c | ||
| splice.c | ||
| stack.c | ||
| stat.c | ||
| statfs.c | ||
| super.c | ||
| sync.c | ||
| timerfd.c | ||
| userfaultfd.c | ||
| utimes.c | ||
| xattr.c | ||