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Filename Latest commit message Latest commit date
Wander Lairson Costa a44602888b netfilter: nfnetlink_osf: avoid OOB read 
[ Upstream commit f4f8a7803119005e87b716874bec07c751efafec ]

The opt_num field is controlled by user mode and is not currently
validated inside the kernel. An attacker can take advantage of this to
trigger an OOB read and potentially leak information.

BUG: KASAN: slab-out-of-bounds in nf_osf_match_one+0xbed/0xd10 net/netfilter/nfnetlink_osf.c:88
Read of size 2 at addr ffff88804bc64272 by task poc/6431

CPU: 1 PID: 6431 Comm: poc Not tainted 6.0.0-rc4 #1
Call Trace:
 nf_osf_match_one+0xbed/0xd10 net/netfilter/nfnetlink_osf.c:88
 nf_osf_find+0x186/0x2f0 net/netfilter/nfnetlink_osf.c:281
 nft_osf_eval+0x37f/0x590 net/netfilter/nft_osf.c:47
 expr_call_ops_eval net/netfilter/nf_tables_core.c:214
 nft_do_chain+0x2b0/0x1490 net/netfilter/nf_tables_core.c:264
 nft_do_chain_ipv4+0x17c/0x1f0 net/netfilter/nft_chain_filter.c:23
 [..]

Also add validation to genre, subtype and version fields.

Fixes: 11eeef41d5 ("netfilter: passive OS fingerprint xtables match")
Reported-by: Lucas Leong <wmliang@infosec.exchange>
Signed-off-by: Wander Lairson Costa <wander@redhat.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2023-09-23 10:59:59 +02:00
arch x86/virt: Drop unnecessary check on extended CPUID level in cpu_has_svm() 2023-09-23 10:59:57 +02:00
block block/partition: fix signedness issue for Amiga partitions 2023-07-27 08:37:29 +02:00
certs
crypto X.509: if signature is unsupported skip validation 2023-09-23 10:59:55 +02:00
Documentation Documentation/sysctl: document page_lock_unfairness 2023-08-30 16:27:27 +02:00
drivers s390/zcrypt: don't leak memory if dev_set_name() fails 2023-09-23 10:59:59 +02:00
fs NFSv4/pnfs: minor fix for cleanup path in nfs4_get_device_info 2023-09-23 10:59:57 +02:00
include ip_tunnels: use DEV_STATS_INC() 2023-09-23 10:59:59 +02:00
init x86/mm: Initialize text poking earlier 2023-08-08 19:56:36 +02:00
ipc ipc/sem: Fix dangling sem_array access in semtimedop race 2022-12-08 11:23:06 +01:00
kernel tracing: Fix race issue between cpu buffer write and swap 2023-09-23 10:59:52 +02:00
lib idr: fix param name in idr_alloc_cyclic() doc 2023-09-23 10:59:59 +02:00
LICENSES
mm tmpfs: verify {g,u}id mount options correctly 2023-09-23 10:59:40 +02:00
net netfilter: nfnetlink_osf: avoid OOB read 2023-09-23 10:59:59 +02:00
samples samples/bpf: Fix buffer overflow in tcp_basertt 2023-07-27 08:37:07 +02:00
scripts kconfig: fix possible buffer overflow 2023-09-23 10:59:57 +02:00
security smackfs: Prevent underflow in smk_set_cipso() 2023-09-23 10:59:46 +02:00
sound ALSA: pcm: Fix missing fixup call in compat hw_refine ioctl 2023-09-23 10:59:54 +02:00
tools perf top: Don't pass an ERR_PTR() directly to perf_session__delete() 2023-09-23 10:59:57 +02:00
usr
virt KVM: Destroy target device if coalesced MMIO unregistration fails 2023-03-11 16:44:01 +01:00
.clang-format
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore
.mailmap
COPYING
CREDITS
Kbuild
Kconfig
MAINTAINERS iio: stx104: Move to addac subdirectory 2023-08-30 16:27:12 +02:00
Makefile Linux 5.4.256 2023-09-02 09:19:19 +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.

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.