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Hyunchul Lee 824d4f64c2 ksmbd: prevent out of bound read for SMB2_TREE_CONNNECT 
if Status is not 0 and PathLength is long,
smb_strndup_from_utf16 could make out of bound
read in smb2_tree_connnect.

This bug can lead an oops looking something like:

[ 1553.882047] BUG: KASAN: slab-out-of-bounds in smb_strndup_from_utf16+0x469/0x4c0 [ksmbd]
[ 1553.882064] Read of size 2 at addr ffff88802c4eda04 by task kworker/0:2/42805
...
[ 1553.882095] Call Trace:
[ 1553.882098]  <TASK>
[ 1553.882101]  dump_stack_lvl+0x49/0x5f
[ 1553.882107]  print_report.cold+0x5e/0x5cf
[ 1553.882112]  ? smb_strndup_from_utf16+0x469/0x4c0 [ksmbd]
[ 1553.882122]  kasan_report+0xaa/0x120
[ 1553.882128]  ? smb_strndup_from_utf16+0x469/0x4c0 [ksmbd]
[ 1553.882139]  __asan_report_load_n_noabort+0xf/0x20
[ 1553.882143]  smb_strndup_from_utf16+0x469/0x4c0 [ksmbd]
[ 1553.882155]  ? smb_strtoUTF16+0x3b0/0x3b0 [ksmbd]
[ 1553.882166]  ? __kmalloc_node+0x185/0x430
[ 1553.882171]  smb2_tree_connect+0x140/0xab0 [ksmbd]
[ 1553.882185]  handle_ksmbd_work+0x30e/0x1020 [ksmbd]
[ 1553.882197]  process_one_work+0x778/0x11c0
[ 1553.882201]  ? _raw_spin_lock_irq+0x8e/0xe0
[ 1553.882206]  worker_thread+0x544/0x1180
[ 1553.882209]  ? __cpuidle_text_end+0x4/0x4
[ 1553.882214]  kthread+0x282/0x320
[ 1553.882218]  ? process_one_work+0x11c0/0x11c0
[ 1553.882221]  ? kthread_complete_and_exit+0x30/0x30
[ 1553.882225]  ret_from_fork+0x1f/0x30
[ 1553.882231]  </TASK>

There is no need to check error request validation in server.
This check allow invalid requests not to validate message.

Fixes: e2f34481b2 ("cifsd: add server-side procedures for SMB3")
Cc: stable@vger.kernel.org
Reported-by: zdi-disclosures@trendmicro.com # ZDI-CAN-17818
Signed-off-by: Hyunchul Lee <hyc.lee@gmail.com>
Acked-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
2022-07-31 23:14:32 -05:00
arch - Improve the check whether the kernel supports WP mappings so that it 2022-07-17 08:27:30 -07:00
block block: fix missing blkcg_bio_issue_init 2022-07-14 10:54:49 -06:00
certs Certs changes 2022-06-21 12:13:53 -05:00
crypto crypto: s390 - do not depend on CRYPTO_HW for SIMD implementations 2022-07-06 20:04:06 -07:00
Documentation RISC-V: 2022-07-15 10:31:46 -07:00
drivers - Fix 32b build 2022-07-17 13:08:03 -07:00
fs ksmbd: prevent out of bound read for SMB2_TREE_CONNNECT 2022-07-31 23:14:32 -05:00
include Input updates for v5.19-rc6 2022-07-17 07:52:46 -07:00
init gcc-12: disable '-Warray-bounds' universally for now 2022-06-09 10:11:12 -07:00
ipc ipc: Free mq_sysctls if ipc namespace creation failed 2022-06-22 17:47:41 -05:00
kernel - A single data race fix on the perf event cleanup path to avoid endless 2022-07-17 08:34:02 -07:00
lib ubsan: disable UBSAN_DIV_ZERO for clang 2022-07-14 15:45:26 -07:00
LICENSES LICENSES/LGPL-2.1: Add LGPL-2.1-or-later as valid identifiers 2021-12-16 14:33:10 +01:00
mm mm: split huge PUD on wp_huge_pud fallback 2022-07-03 15:42:33 -07:00
net net/tls: Check for errors in tls_device_init 2022-07-14 10:12:39 -07:00
samples Fixes and minor clean ups for tracing: 2022-07-12 16:17:40 -07:00
scripts Just when you thought that all the speculation bugs were addressed and 2022-07-11 18:15:25 -07:00
security integrity-v5.19-fix 2022-07-14 12:15:42 -07:00
sound ALSA: hda/realtek - Enable the headset-mic on a Xiaomi's laptop 2022-07-13 12:42:41 +02:00
tools perf trace: Fix SIGSEGV when processing syscall args 2022-07-17 10:59:52 -03:00
usr Not a lot of material this cycle. Many singleton patches against various 2022-05-27 11:22:03 -07:00
virt KVM: x86: disable preemption around the call to kvm_arch_vcpu_{un|}blocking 2022-06-09 10:52:20 -04:00
.clang-format clang-format: Fix space after for_each macros 2022-05-20 19:27:16 +02:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.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: split the second line of *.mod into *.usyms 2022-05-08 03:16:59 +09:00
.mailmap cxl fixes for 5.19-rc6 2022-07-08 12:55:25 -07:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: mark ARM/PALM TREO SUPPORT orphan 2022-07-07 15:17:00 +02:00
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 MAINTAINERS: ksmbd: add entry for documentation 2022-07-24 15:30:16 -05:00
Makefile Linux 5.19-rc7 2022-07-17 13:30:22 -07:00
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.