Test with focal-proposed (5.4.0-90.101)
---

Original:

# ../openat
Killed

[  286.989830] BUG: kernel NULL pointer dereference, address: 0000000000000010
...
[  286.996507] CPU: 2 PID: 5529 Comm: openat Not tainted 5.4.0-90-generic 
#101-Ubuntu
[  286.997358] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 
1.13.0-1ubuntu1.1 04/01/2014
[  286.998397] RIP: 0010:d_namespace_path.constprop.0+0x48/0x300
...
[  287.008418] Call Trace:
[  287.016112]  aa_path_name+0x42/0xb0
[  287.016616]  path_name.isra.0+0x5f/0xe0
[  287.017153]  profile_path_perm.part.0+0x58/0xa0
[  287.017768]  aa_path_perm+0xdd/0x130
[  287.018293]  common_perm+0x96/0x110
[  287.018795]  common_perm_cond+0x4c/0x70
[  287.019353]  apparmor_inode_getattr+0x1d/0x20
[  287.019948]  security_inode_getattr+0x35/0x50
[  287.020542]  vfs_getattr+0x22/0x50
[  287.021042]  vfsub_update_h_iattr+0x95/0xb0 [aufs]
[  287.021687]  ? lookup_dcache+0x46/0x70
[  287.022216]  ? lookup_one_len+0x68/0x90
[  287.022755]  vfsub_lookup_one_len+0x61/0x70 [aufs]
[  287.023413]  au_wh_test+0x26/0xa0 [aufs]
[  287.023978]  au_lkup_dentry+0x1ba/0x670 [aufs]
[  287.024598]  aufs_lookup.part.0+0x119/0x200 [aufs]
[  287.025250]  aufs_atomic_open+0x19d/0x400 [aufs]
[  287.025881]  ? aufs_permission+0x1a9/0x2f0 [aufs]
[  287.026536]  ? security_path_mknod+0x4c/0x70
[  287.027130]  lookup_open+0x364/0x6e0
[  287.027658]  do_last+0x2cb/0x900
[  287.028141]  ? __alloc_file+0x94/0x110
[  287.028678]  path_openat+0x8d/0x290
[  287.029184]  ? do_async_page_fault+0x39/0x70
[  287.029773]  do_filp_open+0x91/0x100
[  287.030292]  ? strncpy_from_user+0xbd/0x150
[  287.030879]  ? __alloc_fd+0xb8/0x150
[  287.031402]  do_sys_open+0x17e/0x290
[  287.031920]  __x64_sys_openat+0x20/0x30
[  287.032469]  do_syscall_64+0x57/0x190
[  287.032997]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[  287.033682] RIP: 0033:0x7f299dccf026


Patched:

# ../openat
# echo $?
0

# uname -rv
5.4.0-90-generic #101+test20211022b2 SMP Fri Oct 22 10:34:51 -03 2021

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

Title:
  aufs: kernel bug with apparmor and fuseblk

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