[PATCH] apparmor: fix possible NULL pointer dereference

[John Johansen]

On 5/7/24 09:12, Leesoo Ahn wrote:
> profile->parent->dents[AAFS_PROF_DIR] could be NULL only if its parent is made
> from __create_missing_ancestors(..) and 'ent->old' is NULL in
> aa_replace_profiles(..).
> In that case, it must return an error code and the code, -ENOENT represents
> its state that the path of its parent is not existed yet.
> 
> BUG: kernel NULL pointer dereference, address: 0000000000000030
> PGD 0 P4D 0
> PREEMPT SMP PTI
> CPU: 4 PID: 3362 Comm: apparmor_parser Not tainted 6.8.0-24-generic #24
> Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.15.0-1 04/01/2014
> RIP: 0010:aafs_create.constprop.0+0x7f/0x130
> Code: 4c 63 e0 48 83 c4 18 4c 89 e0 5b 41 5c 41 5d 41 5e 41 5f 5d 31 d2 31 c9 31 f6 31 ff 45 31 c0 45 31 c9 45 31 d2 c3 cc cc cc cc <4d> 8b 55 30 4d 8d ba a0 00 00 00 4c 89 55 c0 4c 89 ff e8 7a 6a ae
> RSP: 0018:ffffc9000b2c7c98 EFLAGS: 00010246
> RAX: 0000000000000000 RBX: 00000000000041ed RCX: 0000000000000000
> RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
> RBP: ffffc9000b2c7cd8 R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff82baac10
> R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
> FS:  00007be9f22cf740(0000) GS:ffff88817bc00000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 0000000000000030 CR3: 0000000134b08000 CR4: 00000000000006f0
> Call Trace:
>   <TASK>
>   ? show_regs+0x6d/0x80
>   ? __die+0x24/0x80
>   ? page_fault_oops+0x99/0x1b0
>   ? kernelmode_fixup_or_oops+0xb2/0x140
>   ? __bad_area_nosemaphore+0x1a5/0x2c0
>   ? find_vma+0x34/0x60
>   ? bad_area_nosemaphore+0x16/0x30
>   ? do_user_addr_fault+0x2a2/0x6b0
>   ? exc_page_fault+0x83/0x1b0
>   ? asm_exc_page_fault+0x27/0x30
>   ? aafs_create.constprop.0+0x7f/0x130
>   ? aafs_create.constprop.0+0x51/0x130
>   __aafs_profile_mkdir+0x3d6/0x480
>   aa_replace_profiles+0x83f/0x1270
>   policy_update+0xe3/0x180
>   profile_load+0xbc/0x150
>   ? rw_verify_area+0x47/0x140
>   vfs_write+0x100/0x480
>   ? __x64_sys_openat+0x55/0xa0
>   ? syscall_exit_to_user_mode+0x86/0x260
>   ksys_write+0x73/0x100
>   __x64_sys_write+0x19/0x30
>   x64_sys_call+0x7e/0x25c0
>   do_syscall_64+0x7f/0x180
>   entry_SYSCALL_64_after_hwframe+0x78/0x80
> RIP: 0033:0x7be9f211c574
> Code: c7 00 16 00 00 00 b8 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 80 3d d5 ea 0e 00 00 74 13 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 54 c3 0f 1f 00 55 48 89 e5 48 83 ec 20 48 89
> RSP: 002b:00007ffd26f2b8c8 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
> RAX: ffffffffffffffda RBX: 00005d504415e200 RCX: 00007be9f211c574
> RDX: 0000000000001fc1 RSI: 00005d504418bc80 RDI: 0000000000000004
> RBP: 0000000000001fc1 R08: 0000000000001fc1 R09: 0000000080000000
> R10: 0000000000000000 R11: 0000000000000202 R12: 00005d504418bc80
> R13: 0000000000000004 R14: 00007ffd26f2b9b0 R15: 00007ffd26f2ba30
>   </TASK>
> Modules linked in: snd_seq_dummy snd_hrtimer qrtr snd_hda_codec_generic snd_hda_intel snd_intel_dspcfg snd_intel_sdw_acpi snd_hda_codec snd_hda_core snd_hwdep snd_pcm snd_seq_midi snd_seq_midi_event snd_rawmidi snd_seq snd_seq_device i2c_i801 snd_timer i2c_smbus qxl snd soundcore drm_ttm_helper lpc_ich ttm joydev input_leds serio_raw mac_hid binfmt_misc msr parport_pc ppdev lp parport efi_pstore nfnetlink dmi_sysfs qemu_fw_cfg ip_tables x_tables autofs4 hid_generic usbhid hid ahci libahci psmouse virtio_rng xhci_pci xhci_pci_renesas
> CR2: 0000000000000030
> ---[ end trace 0000000000000000 ]---
> RIP: 0010:aafs_create.constprop.0+0x7f/0x130
> Code: 4c 63 e0 48 83 c4 18 4c 89 e0 5b 41 5c 41 5d 41 5e 41 5f 5d 31 d2 31 c9 31 f6 31 ff 45 31 c0 45 31 c9 45 31 d2 c3 cc cc cc cc <4d> 8b 55 30 4d 8d ba a0 00 00 00 4c 89 55 c0 4c 89 ff e8 7a 6a ae
> RSP: 0018:ffffc9000b2c7c98 EFLAGS: 00010246
> RAX: 0000000000000000 RBX: 00000000000041ed RCX: 0000000000000000
> RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
> RBP: ffffc9000b2c7cd8 R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff82baac10
> R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
> FS:  00007be9f22cf740(0000) GS:ffff88817bc00000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 0000000000000030 CR3: 0000000134b08000 CR4: 00000000000006f0
> 
> Signed-off-by: Leesoo Ahn <lsahn at ooseel.net>

Acked-by: John Johansen <john.johansen at canonical.com>

I have pulled this into my tree

> ---
>   security/apparmor/apparmorfs.c | 4 ++++
>   1 file changed, 4 insertions(+)
> 
> diff --git a/security/apparmor/apparmorfs.c b/security/apparmor/apparmorfs.c
> index bcfea073e3f2..01b923d97a44 100644
> --- a/security/apparmor/apparmorfs.c
> +++ b/security/apparmor/apparmorfs.c
> @@ -1692,6 +1692,10 @@ int __aafs_profile_mkdir(struct aa_profile *profile, struct dentry *parent)
>   		struct aa_profile *p;
>   		p = aa_deref_parent(profile);
>   		dent = prof_dir(p);
> +		if (!dent) {
> +			error = -ENOENT;
> +			goto fail2;
> +		}
>   		/* adding to parent that previously didn't have children */
>   		dent = aafs_create_dir("profiles", dent);
>   		if (IS_ERR(dent))