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Zhengchao Shao 0d27567fde xfrm: fix slab-use-after-free in decode_session6 [ Upstream commit `53223f2ed1` ] When the xfrm device is set to the qdisc of the sfb type, the cb field of the sent skb may be modified during enqueuing. Then, slab-use-after-free may occur when the xfrm device sends IPv6 packets. The stack information is as follows: BUG: KASAN: slab-use-after-free in decode_session6+0x103f/0x1890 Read of size 1 at addr ffff8881111458ef by task swapper/3/0 CPU: 3 PID: 0 Comm: swapper/3 Not tainted 6.4.0-next-20230707 #409 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-1.fc33 04/01/2014 Call Trace: <IRQ> dump_stack_lvl+0xd9/0x150 print_address_description.constprop.0+0x2c/0x3c0 kasan_report+0x11d/0x130 decode_session6+0x103f/0x1890 __xfrm_decode_session+0x54/0xb0 xfrmi_xmit+0x173/0x1ca0 dev_hard_start_xmit+0x187/0x700 sch_direct_xmit+0x1a3/0xc30 __qdisc_run+0x510/0x17a0 __dev_queue_xmit+0x2215/0x3b10 neigh_connected_output+0x3c2/0x550 ip6_finish_output2+0x55a/0x1550 ip6_finish_output+0x6b9/0x1270 ip6_output+0x1f1/0x540 ndisc_send_skb+0xa63/0x1890 ndisc_send_rs+0x132/0x6f0 addrconf_rs_timer+0x3f1/0x870 call_timer_fn+0x1a0/0x580 expire_timers+0x29b/0x4b0 run_timer_softirq+0x326/0x910 __do_softirq+0x1d4/0x905 irq_exit_rcu+0xb7/0x120 sysvec_apic_timer_interrupt+0x97/0xc0 </IRQ> <TASK> asm_sysvec_apic_timer_interrupt+0x1a/0x20 RIP: 0010:intel_idle_hlt+0x23/0x30 Code: 1f 84 00 00 00 00 00 f3 0f 1e fa 41 54 41 89 d4 0f 1f 44 00 00 66 90 0f 1f 44 00 00 0f 00 2d c4 9f ab 00 0f 1f 44 00 00 fb f4 <fa> 44 89 e0 41 5c c3 66 0f 1f 44 00 00 f3 0f 1e fa 41 54 41 89 d4 RSP: 0018:ffffc90000197d78 EFLAGS: 00000246 RAX: 00000000000a83c3 RBX: ffffe8ffffd09c50 RCX: ffffffff8a22d8e5 RDX: 0000000000000001 RSI: ffffffff8d3f8080 RDI: ffffe8ffffd09c50 RBP: ffffffff8d3f8080 R08: 0000000000000001 R09: ffffed1026ba6d9d R10: ffff888135d36ceb R11: 0000000000000001 R12: 0000000000000001 R13: ffffffff8d3f8100 R14: 0000000000000001 R15: 0000000000000000 cpuidle_enter_state+0xd3/0x6f0 cpuidle_enter+0x4e/0xa0 do_idle+0x2fe/0x3c0 cpu_startup_entry+0x18/0x20 start_secondary+0x200/0x290 secondary_startup_64_no_verify+0x167/0x16b </TASK> Allocated by task 939: kasan_save_stack+0x22/0x40 kasan_set_track+0x25/0x30 __kasan_slab_alloc+0x7f/0x90 kmem_cache_alloc_node+0x1cd/0x410 kmalloc_reserve+0x165/0x270 __alloc_skb+0x129/0x330 inet6_ifa_notify+0x118/0x230 __ipv6_ifa_notify+0x177/0xbe0 addrconf_dad_completed+0x133/0xe00 addrconf_dad_work+0x764/0x1390 process_one_work+0xa32/0x16f0 worker_thread+0x67d/0x10c0 kthread+0x344/0x440 ret_from_fork+0x1f/0x30 The buggy address belongs to the object at ffff888111145800 which belongs to the cache skbuff_small_head of size 640 The buggy address is located 239 bytes inside of freed 640-byte region [ffff888111145800, ffff888111145a80) As commit `f855691975` ("xfrm6: Fix the nexthdr offset in _decode_session6.") showed, xfrm_decode_session was originally intended only for the receive path. IP6CB(skb)->nhoff is not set during transmission. Therefore, set the cb field in the skb to 0 before sending packets. Fixes: `f855691975` ("xfrm6: Fix the nexthdr offset in _decode_session6.") Signed-off-by: Zhengchao Shao <shaozhengchao@huawei.com> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com> Signed-off-by: Sasha Levin <sashal@kernel.org>		2023-08-23 17:52:32 +02:00
arch	powerpc/rtas_flash: allow user copy to flash block cache objects	2023-08-23 17:52:30 +02:00
block	blk-mq: Fix stall due to recursive flush plug	2023-08-03 10:23:48 +02:00
certs
crypto	crypto: jitter - correct health test during initialization	2023-07-19 16:21:42 +02:00
Documentation	iommu/amd: Introduce Disable IRTE Caching Support	2023-08-23 17:52:21 +02:00
drivers	i2c: designware: Handle invalid SMBus block data response length value	2023-08-23 17:52:31 +02:00
fs	btrfs: fix BUG_ON condition in btrfs_cancel_balance	2023-08-23 17:52:31 +02:00
include	KVM: arm64: vgic-v4: Make the doorbell request robust w.r.t preemption	2023-08-23 17:52:28 +02:00
init	x86/mm: Initialize text poking earlier	2023-08-08 20:03:49 +02:00
io_uring	io_uring: correct check for O_TMPFILE	2023-08-16 18:27:24 +02:00
ipc
kernel	ring-buffer: Do not swap cpu_buffer during resize process	2023-08-23 17:52:27 +02:00
lib	debugobjects: Recheck debug_objects_enabled before reporting	2023-08-11 12:08:23 +02:00
LICENSES
mm	zsmalloc: fix races between modifications of fullness and isolated	2023-08-23 17:52:17 +02:00
net	xfrm: fix slab-use-after-free in decode_session6	2023-08-23 17:52:32 +02:00
rust	rust: allocator: Prevent mis-aligned allocation	2023-08-11 12:08:18 +02:00
samples	samples: ftrace: Save required argument registers in sample trampolines	2023-07-23 13:49:44 +02:00
scripts	gcc-plugins: Reorganize gimple includes for GCC 13	2023-08-16 18:27:20 +02:00
security	security: keys: Modify mismatched function name	2023-07-27 08:50:43 +02:00
sound	ALSA: hda/realtek: Add quirk for ASUS ROG GZ301V	2023-08-23 17:52:26 +02:00
tools	selftests: forwarding: tc_actions: Use ncat instead of nc	2023-08-23 17:52:18 +02:00
usr
virt	KVM: Grab a reference to KVM for VM and vCPU stats file descriptors	2023-08-03 10:24:08 +02:00
.clang-format
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore
.mailmap
.rustfmt.toml
COPYING
CREDITS
Kbuild
Kconfig
MAINTAINERS
Makefile	Linux 6.1.46	2023-08-16 18:27:31 +02:00
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