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Lin Ma 44f69c96f8 xfrm: add NULL check in xfrm_update_ae_params 
[ Upstream commit 00374d9b6d ]

Normally, x->replay_esn and x->preplay_esn should be allocated at
xfrm_alloc_replay_state_esn(...) in xfrm_state_construct(...), hence the
xfrm_update_ae_params(...) is okay to update them. However, the current
implementation of xfrm_new_ae(...) allows a malicious user to directly
dereference a NULL pointer and crash the kernel like below.

BUG: kernel NULL pointer dereference, address: 0000000000000000
PGD 8253067 P4D 8253067 PUD 8e0e067 PMD 0
Oops: 0002 [#1] PREEMPT SMP KASAN NOPTI
CPU: 0 PID: 98 Comm: poc.npd Not tainted 6.4.0-rc7-00072-gdad9774deaf1 #8
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.0-0-gd239552ce722-prebuilt.qemu.o4
RIP: 0010:memcpy_orig+0xad/0x140
Code: e8 4c 89 5f e0 48 8d 7f e0 73 d2 83 c2 20 48 29 d6 48 29 d7 83 fa 10 72 34 4c 8b 06 4c 8b 4e 08 c
RSP: 0018:ffff888008f57658 EFLAGS: 00000202
RAX: 0000000000000000 RBX: ffff888008bd0000 RCX: ffffffff8238e571
RDX: 0000000000000018 RSI: ffff888007f64844 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff888008f57818
R13: ffff888007f64aa4 R14: 0000000000000000 R15: 0000000000000000
FS:  00000000014013c0(0000) GS:ffff88806d600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000000054d8000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 ? __die+0x1f/0x70
 ? page_fault_oops+0x1e8/0x500
 ? __pfx_is_prefetch.constprop.0+0x10/0x10
 ? __pfx_page_fault_oops+0x10/0x10
 ? _raw_spin_unlock_irqrestore+0x11/0x40
 ? fixup_exception+0x36/0x460
 ? _raw_spin_unlock_irqrestore+0x11/0x40
 ? exc_page_fault+0x5e/0xc0
 ? asm_exc_page_fault+0x26/0x30
 ? xfrm_update_ae_params+0xd1/0x260
 ? memcpy_orig+0xad/0x140
 ? __pfx__raw_spin_lock_bh+0x10/0x10
 xfrm_update_ae_params+0xe7/0x260
 xfrm_new_ae+0x298/0x4e0
 ? __pfx_xfrm_new_ae+0x10/0x10
 ? __pfx_xfrm_new_ae+0x10/0x10
 xfrm_user_rcv_msg+0x25a/0x410
 ? __pfx_xfrm_user_rcv_msg+0x10/0x10
 ? __alloc_skb+0xcf/0x210
 ? stack_trace_save+0x90/0xd0
 ? filter_irq_stacks+0x1c/0x70
 ? __stack_depot_save+0x39/0x4e0
 ? __kasan_slab_free+0x10a/0x190
 ? kmem_cache_free+0x9c/0x340
 ? netlink_recvmsg+0x23c/0x660
 ? sock_recvmsg+0xeb/0xf0
 ? __sys_recvfrom+0x13c/0x1f0
 ? __x64_sys_recvfrom+0x71/0x90
 ? do_syscall_64+0x3f/0x90
 ? entry_SYSCALL_64_after_hwframe+0x72/0xdc
 ? copyout+0x3e/0x50
 netlink_rcv_skb+0xd6/0x210
 ? __pfx_xfrm_user_rcv_msg+0x10/0x10
 ? __pfx_netlink_rcv_skb+0x10/0x10
 ? __pfx_sock_has_perm+0x10/0x10
 ? mutex_lock+0x8d/0xe0
 ? __pfx_mutex_lock+0x10/0x10
 xfrm_netlink_rcv+0x44/0x50
 netlink_unicast+0x36f/0x4c0
 ? __pfx_netlink_unicast+0x10/0x10
 ? netlink_recvmsg+0x500/0x660
 netlink_sendmsg+0x3b7/0x700

This Null-ptr-deref bug is assigned CVE-2023-3772. And this commit
adds additional NULL check in xfrm_update_ae_params to fix the NPD.

Fixes: d8647b79c3 ("xfrm: Add user interface for esn and big anti-replay windows")
Signed-off-by: Lin Ma <linma@zju.edu.cn>
Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2023-08-30 16:31:48 +02:00
arch powerpc/rtas_flash: allow user copy to flash block cache objects 2023-08-30 16:31:47 +02:00
block block: fix signed int overflow in Amiga partition support 2023-08-30 16:31:46 +02:00
certs certs/blacklist_hashes.c: fix const confusion in certs blacklist 2022-06-25 11:49:16 +02:00
crypto crypto: drbg - Only fail when jent is unavailable in FIPS mode 2023-05-17 11:13:13 +02:00
Documentation Documentation: security-bugs.rst: clarify CVE handling 2023-08-11 11:45:34 +02:00
drivers fbdev: mmp: fix value check in mmphw_probe() 2023-08-30 16:31:47 +02:00
firmware Fix built-in early-load Intel microcode alignment 2020-01-23 08:21:29 +01:00
fs btrfs: fix BUG_ON condition in btrfs_cancel_balance 2023-08-30 16:31:47 +02:00
include media: v4l2-mem2mem: add lock to protect parameter num_rdy 2023-08-30 16:31:43 +02:00
init init, x86: Move mem_encrypt_init() into arch_cpu_finalize_init() 2023-08-08 19:49:18 +02:00
ipc ipc/sem: Fix dangling sem_array access in semtimedop race 2022-12-08 11:18:35 +01:00
kernel perf: Fix function pointer case 2023-08-11 11:45:36 +02:00
lib lib/mpi: Eliminate unused umul_ppmm definitions for MIPS 2023-08-30 16:31:41 +02:00
LICENSES LICENSES: Remove CC-BY-SA-4.0 license text 2018-10-18 11:28:50 +02:00
mm treewide: Remove uninitialized_var() usage 2023-08-11 11:45:01 +02:00
net xfrm: add NULL check in xfrm_update_ae_params 2023-08-30 16:31:48 +02:00
samples samples/bpf: Fix buffer overflow in tcp_basertt 2023-08-11 11:45:03 +02:00
scripts modpost: fix section mismatch message for R_ARM_{PC24,CALL,JUMP24} 2023-08-11 11:45:10 +02:00
security IMA: allow/fix UML builds 2023-08-30 16:31:43 +02:00
sound ALSA: emu10k1: roll up loops in DSP setup code for Audigy 2023-08-30 16:31:42 +02:00
tools selftests: forwarding: tc_flower: Relax success criterion 2023-08-30 16:31:41 +02:00
usr initramfs: restore default compression behavior 2020-04-13 10:44:59 +02:00
virt KVM: arm64: vgic: Fix exit condition in scan_its_table() 2022-11-03 23:52:24 +09:00
.clang-format clang-format: Set IndentWrappedFunctionNames false 2018-08-01 18:38:51 +02:00
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore
.mailmap libnvdimm-for-4.19_misc 2018-08-25 18:13:10 -07:00
COPYING
CREDITS 9p: remove Ron Minnich from MAINTAINERS 2018-08-17 16:20:26 -07:00
Kbuild
Kconfig kconfig: move the "Executable file formats" menu to fs/Kconfig.binfmt 2018-08-02 08:06:55 +09:00
MAINTAINERS clocksource/drivers: Unify the names to timer-* format 2023-08-11 11:45:02 +02:00
Makefile Linux 4.19.292 2023-08-16 18:13:01 +02:00
README

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.
See Documentation/00-INDEX for a list of what is contained in each file.

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.