Test with bionic-proposed (4.15.0-162.170)
---

Original:

# ../openat
Killed

[  442.526300] BUG: unable to handle kernel NULL pointer dereference at 
0000000000000010
...
[  442.539854] CPU: 1 PID: 5644 Comm: openat Not tainted 4.15.0-162-generic 
#170-Ubuntu
[  442.540733] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 
1.13.0-1ubuntu1.1 04/01/2014
[  442.541755] RIP: 0010:aa_path_name+0x55/0x370
...
[  442.549808] Call Trace:
[  442.550211]  path_name+0x60/0xe0
[  442.550687]  profile_path_perm.part.7+0x57/0xa0
[  442.551293]  aa_path_perm+0xe2/0x130
[  442.551819]  common_perm+0x59/0x130
[  442.552323]  common_perm_cond+0x4c/0x70
[  442.552856]  apparmor_inode_getattr+0x1d/0x20
[  442.553444]  security_inode_getattr+0x47/0x60
[  442.554038]  vfs_getattr+0x21/0x40
[  442.554538]  vfsub_update_h_iattr+0x95/0xb0 [aufs]
[  442.555172]  ? __lookup_hash+0x22/0xa0
[  442.555697]  ? lookup_one_len+0x113/0x120
[  442.556323]  vfsub_lookup_one_len+0x50/0x70 [aufs]
[  442.557065]  au_wh_test+0x25/0xe0 [aufs]
[  442.557615]  au_lkup_dentry+0x484/0x620 [aufs]
[  442.558225]  aufs_lookup.part.33+0x11c/0x210 [aufs]
[  442.562787]  aufs_atomic_open+0x102/0x3b0 [aufs]
[  442.563427]  ? aufs_permission+0x190/0x2d0 [aufs]
[  442.564098]  ? __inode_permission+0x5b/0x160
[  442.564689]  path_openat+0xde1/0x18b0
[  442.565214]  ? path_openat+0xde1/0x18b0
[  442.565756]  do_filp_open+0x9b/0x110
[  442.566266]  ? __check_object_size+0xc8/0x1b0
[  442.566862]  ? __alloc_fd+0xb2/0x170
[  442.567376]  do_sys_open+0x1ba/0x2c0
[  442.567908]  ? do_sys_open+0x1ba/0x2c0
[  442.568453]  SyS_openat+0x14/0x20
[  442.568939]  do_syscall_64+0x73/0x130
[  442.569458]  entry_SYSCALL_64_after_hwframe+0x41/0xa6
[  442.570117] RIP: 0033:0x7f079564af83


Patched:

# ../openat
# echo $?
0

# uname -rv
4.15.0-162-generic #170+test20211022b1 SMP Fri Oct 22 10:59:39 -03 2021

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https://bugs.launchpad.net/bugs/1948470

Title:
  aufs: kernel bug with apparmor and fuseblk

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