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Xiao Liang 347dcb84a4 apparmor: Fix null pointer deref when receiving skb during sock creation 
[ Upstream commit fce09ea314 ]

The panic below is observed when receiving ICMP packets with secmark set
while an ICMP raw socket is being created. SK_CTX(sk)->label is updated
in apparmor_socket_post_create(), but the packet is delivered to the
socket before that, causing the null pointer dereference.
Drop the packet if label context is not set.

    BUG: kernel NULL pointer dereference, address: 000000000000004c
    #PF: supervisor read access in kernel mode
    #PF: error_code(0x0000) - not-present page
    PGD 0 P4D 0
    Oops: 0000 [#1] PREEMPT SMP NOPTI
    CPU: 0 PID: 407 Comm: a.out Not tainted 6.4.12-arch1-1 #1 3e6fa2753a2d75925c34ecb78e22e85a65d083df
    Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 05/28/2020
    RIP: 0010:aa_label_next_confined+0xb/0x40
    Code: 00 00 48 89 ef e8 d5 25 0c 00 e9 66 ff ff ff 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 66 0f 1f 00 0f 1f 44 00 00 89 f0 <8b> 77 4c 39 c6 7e 1f 48 63 d0 48 8d 14 d7 eb 0b 83 c0 01 48 83 c2
    RSP: 0018:ffffa92940003b08 EFLAGS: 00010246
    RAX: 0000000000000000 RBX: 0000000000000000 RCX: 000000000000000e
    RDX: ffffa92940003be8 RSI: 0000000000000000 RDI: 0000000000000000
    RBP: ffff8b57471e7800 R08: ffff8b574c642400 R09: 0000000000000002
    R10: ffffffffbd820eeb R11: ffffffffbeb7ff00 R12: ffff8b574c642400
    R13: 0000000000000001 R14: 0000000000000001 R15: 0000000000000000
    FS:  00007fb092ea7640(0000) GS:ffff8b577bc00000(0000) knlGS:0000000000000000
    CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
    CR2: 000000000000004c CR3: 00000001020f2005 CR4: 00000000007706f0
    PKRU: 55555554
    Call Trace:
     <IRQ>
     ? __die+0x23/0x70
     ? page_fault_oops+0x171/0x4e0
     ? exc_page_fault+0x7f/0x180
     ? asm_exc_page_fault+0x26/0x30
     ? aa_label_next_confined+0xb/0x40
     apparmor_secmark_check+0xec/0x330
     security_sock_rcv_skb+0x35/0x50
     sk_filter_trim_cap+0x47/0x250
     sock_queue_rcv_skb_reason+0x20/0x60
     raw_rcv+0x13c/0x210
     raw_local_deliver+0x1f3/0x250
     ip_protocol_deliver_rcu+0x4f/0x2f0
     ip_local_deliver_finish+0x76/0xa0
     __netif_receive_skb_one_core+0x89/0xa0
     netif_receive_skb+0x119/0x170
     ? __netdev_alloc_skb+0x3d/0x140
     vmxnet3_rq_rx_complete+0xb23/0x1010 [vmxnet3 56a84f9c97178c57a43a24ec073b45a9d6f01f3a]
     vmxnet3_poll_rx_only+0x36/0xb0 [vmxnet3 56a84f9c97178c57a43a24ec073b45a9d6f01f3a]
     __napi_poll+0x28/0x1b0
     net_rx_action+0x2a4/0x380
     __do_softirq+0xd1/0x2c8
     __irq_exit_rcu+0xbb/0xf0
     common_interrupt+0x86/0xa0
     </IRQ>
     <TASK>
     asm_common_interrupt+0x26/0x40
    RIP: 0010:apparmor_socket_post_create+0xb/0x200
    Code: 08 48 85 ff 75 a1 eb b1 0f 1f 80 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 0f 1f 44 00 00 41 54 <55> 48 89 fd 53 45 85 c0 0f 84 b2 00 00 00 48 8b 1d 80 56 3f 02 48
    RSP: 0018:ffffa92940ce7e50 EFLAGS: 00000286
    RAX: ffffffffbc756440 RBX: 0000000000000000 RCX: 0000000000000001
    RDX: 0000000000000003 RSI: 0000000000000002 RDI: ffff8b574eaab740
    RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
    R10: ffff8b57444cec70 R11: 0000000000000000 R12: 0000000000000003
    R13: 0000000000000002 R14: ffff8b574eaab740 R15: ffffffffbd8e4748
     ? __pfx_apparmor_socket_post_create+0x10/0x10
     security_socket_post_create+0x4b/0x80
     __sock_create+0x176/0x1f0
     __sys_socket+0x89/0x100
     __x64_sys_socket+0x17/0x20
     do_syscall_64+0x5d/0x90
     ? do_syscall_64+0x6c/0x90
     ? do_syscall_64+0x6c/0x90
     ? do_syscall_64+0x6c/0x90
     entry_SYSCALL_64_after_hwframe+0x72/0xdc

Fixes: ab9f211508 ("apparmor: Allow filtering based on secmark policy")
Signed-off-by: Xiao Liang <shaw.leon@gmail.com>
Signed-off-by: John Johansen <john.johansen@canonical.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2024-08-19 05:41:05 +02:00
arch MIPS: SMP-CPS: Fix address for GCR_ACCESS register for CM3 and later 2024-08-19 05:41:04 +02:00
block block/ioctl: prefer different overflow check 2024-07-05 09:12:33 +02:00
certs certs/blacklist_hashes.c: fix const confusion in certs blacklist 2022-06-22 14:13:17 +02:00
crypto crypto: aead,cipher - zeroize key buffer after use 2024-07-18 13:05:38 +02:00
Documentation dt-bindings: thermal: correct thermal zone node name limit 2024-08-19 05:40:54 +02:00
drivers mISDN: Fix a use after free in hfcmulti_tx() 2024-08-19 05:41:05 +02:00
fs f2fs: fix start segno of large section 2024-08-19 05:41:03 +02:00
include kernel: rerun task_work while freezing in get_signal() 2024-08-19 05:41:03 +02:00
init init/main.c: Fix potential static_command_line memory overflow 2024-05-02 16:23:39 +02:00
io_uring io_uring/io-wq: limit retrying worker initialisation 2024-08-19 05:41:03 +02:00
ipc ipc/sem: Fix dangling sem_array access in semtimedop race 2022-12-08 11:24:00 +01:00
kernel dma: fix call order in dmam_free_coherent 2024-08-19 05:41:04 +02:00
lib kobject_uevent: Fix OOB access within zap_modalias_env() 2024-08-19 05:40:59 +02:00
LICENSES LICENSES/deprecated: add Zlib license text 2020-09-16 14:33:49 +02:00
mm Revert "mm/writeback: fix possible divide-by-zero in wb_dirty_limits(), again" 2024-07-18 13:05:43 +02:00
net bpf: Fix a segment issue when downgrading gso_size 2024-08-19 05:41:05 +02:00
samples samples/hw_breakpoint: fix building without module unloading 2023-09-23 11:01:09 +02:00
scripts kbuild: Fix '-S -c' in x86 stack protector scripts 2024-08-19 05:40:59 +02:00
security apparmor: Fix null pointer deref when receiving skb during sock creation 2024-08-19 05:41:05 +02:00
sound ASoC: max98088: Check for clk_prepare_enable() error 2024-08-19 05:40:52 +02:00
tools libbpf: Fix no-args func prototype BTF dumping syntax 2024-08-19 05:41:03 +02:00
usr usr/include/Makefile: add linux/nfc.h to the compile-test coverage 2022-02-01 17:25:48 +01:00
virt KVM: Always flush async #PF workqueue when vCPU is being destroyed 2024-04-13 12:58:04 +02:00
.clang-format RDMA 5.10 pull request 2020-10-17 11:18:18 -07:00
.cocciconfig
.get_maintainer.ignore Opt out of scripts/get_maintainer.pl 2019-05-16 10:53:40 -07:00
.gitattributes .gitattributes: use 'dts' diff driver for dts files 2019-12-04 19:44:11 -08:00
.gitignore kbuild: generate Module.symvers only when vmlinux exists 2021-05-19 10:12:59 +02:00
.mailmap mailmap: add two more addresses of Uwe Kleine-König 2020-12-06 10:19:07 -08:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: Move Jason Cooper to CREDITS 2020-11-30 10:20:34 +01:00
Kbuild kbuild: rename hostprogs-y/always to hostprogs/always-y 2020-02-04 01:53:07 +09:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS Remove DECnet support from kernel 2023-06-21 15:45:38 +02:00
Makefile Linux 5.10.223 2024-07-27 10:40:24 +02:00
README Drop all 00-INDEX files from Documentation/ 2018-09-09 15:08:58 -06:00

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.