[Apparmor-dev] OOPS in fuse_do_setattr()

[Luiz Fernando N. Capitulino]

 Hello,

 A Mandriva user has reported a OOPS which seems to be caused by
Apparmor. It happens with the apparmor version for 2.6.24 kernels:

"""
BUG: unable to handle kernel NULL pointer dereference at virtual address
00000148
printing eip: e0f69e50 *pde = 00000000 
Oops: 0000 [#1] SMP 
Modules linked in: nfs lockd nfs_acl sunrpc fuse af_packet snd_seq_dummy
snd_seq_oss snd_seq_midi_evente

Pid: 4304, comm: rsync Not tainted (2.6.24.3-desktop-3mnb #1)
EIP: 0060:[<e0f69e50>] EFLAGS: 00010206 CPU: 0
EIP is at fuse_do_setattr+0x170/0x3b0 [fuse]
EAX: 000000d8 EBX: df2c9f70 ECX: 00002041 EDX: 000000d8
ESI: df1018d0 EDI: 00000000 EBP: df2c9f14 ESP: df2c9e20
 DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
Process rsync (pid: 4304, ti=df2c8000 task=df153740 task.ti=df2c8000)
Stack: c0146eea df2c9e2c c01e4db8 df2c9e90 df2c9e48 df2c9eb0 000000d8 df2a4000 
       dee44800 df1018d0 00000000 00000000 00000000 00000000 00000000 00000000 
       00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 
Call Trace:
 [<c010645a>] show_trace_log_lvl+0x1a/0x30
 [<c010651b>] show_stack_log_lvl+0xab/0xd0
 [<c01065fd>] show_registers+0xbd/0x1c0
 [<c010682e>] die+0x12e/0x260
 [<c012287f>] do_page_fault+0x33f/0x650
 [<c0344c7a>] error_code+0x72/0x78
 [<e0f6a0a1>] fuse_setattr+0x11/0x30 [fuse]
 [<c01a2d70>] notify_change+0x110/0x420
 [<c018d53c>] sys_fchmod+0xbc/0xf0
 [<c010532e>] sysenter_past_esp+0x6b/0xa1
 =======================
Code: 00 00 85 ff 0f 84 7e 01 00 00 66 f7 c1 00 a0 0f 84 73 01 00 00 8d b6 00
00 00 00 8b 85 24 ff ff f 
EIP: [<e0f69e50>] fuse_do_setattr+0x170/0x3b0 [fuse] SS:ESP 0068:df2c9e20
---[ end trace 50a1735debb7586e ]---
"""

 I can reproduce it quite easily with the following script:

"""
#!/bin/sh

NFS_FILE=ntfs.fs
MOUNT_P=/mnt/temp
CP_SOURCE=/usr/

sync

dd if=/dev/zero of=$NFS_FILE bs=1M count=256
mkfs.ntfs -F $NFS_FILE 1> /dev/null
mount $NFS_FILE $MOUNT_P -t ntfs-3g

mount | grep $NFS_FILE

echo
echo mounted, trying to copy files

rsync -a $CP_SOURCE $MOUNT_P
"""

 I think it's because of apparmor because I can't reproduce with
a kernel compiled with no apparmor patches.

 But I didn't check the current 'for-mainline' patches yet.

 Is this problem a know issue?

-- 
Luiz Fernando N. Capitulino