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Ye Bin 66523553fa scsi: scsi_debug: Fix out-of-bound read in resp_report_tgtpgs() 
[ Upstream commit f347c26836 ]

The following issue was observed running syzkaller:

BUG: KASAN: slab-out-of-bounds in memcpy include/linux/string.h:377 [inline]
BUG: KASAN: slab-out-of-bounds in sg_copy_buffer+0x150/0x1c0 lib/scatterlist.c:831
Read of size 2132 at addr ffff8880aea95dc8 by task syz-executor.0/9815

CPU: 0 PID: 9815 Comm: syz-executor.0 Not tainted 4.19.202-00874-gfc0fe04215a9 #2
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1ubuntu1 04/01/2014
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0xe4/0x14a lib/dump_stack.c:118
 print_address_description+0x73/0x280 mm/kasan/report.c:253
 kasan_report_error mm/kasan/report.c:352 [inline]
 kasan_report+0x272/0x370 mm/kasan/report.c:410
 memcpy+0x1f/0x50 mm/kasan/kasan.c:302
 memcpy include/linux/string.h:377 [inline]
 sg_copy_buffer+0x150/0x1c0 lib/scatterlist.c:831
 fill_from_dev_buffer+0x14f/0x340 drivers/scsi/scsi_debug.c:1021
 resp_report_tgtpgs+0x5aa/0x770 drivers/scsi/scsi_debug.c:1772
 schedule_resp+0x464/0x12f0 drivers/scsi/scsi_debug.c:4429
 scsi_debug_queuecommand+0x467/0x1390 drivers/scsi/scsi_debug.c:5835
 scsi_dispatch_cmd+0x3fc/0x9b0 drivers/scsi/scsi_lib.c:1896
 scsi_request_fn+0x1042/0x1810 drivers/scsi/scsi_lib.c:2034
 __blk_run_queue_uncond block/blk-core.c:464 [inline]
 __blk_run_queue+0x1a4/0x380 block/blk-core.c:484
 blk_execute_rq_nowait+0x1c2/0x2d0 block/blk-exec.c:78
 sg_common_write.isra.19+0xd74/0x1dc0 drivers/scsi/sg.c:847
 sg_write.part.23+0x6e0/0xd00 drivers/scsi/sg.c:716
 sg_write+0x64/0xa0 drivers/scsi/sg.c:622
 __vfs_write+0xed/0x690 fs/read_write.c:485
kill_bdev:block_device:00000000e138492c
 vfs_write+0x184/0x4c0 fs/read_write.c:549
 ksys_write+0x107/0x240 fs/read_write.c:599
 do_syscall_64+0xc2/0x560 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

We get 'alen' from command its type is int. If userspace passes a large
length we will get a negative 'alen'.

Switch n, alen, and rlen to u32.

Link: https://lore.kernel.org/r/20211013033913.2551004-3-yebin10@huawei.com
Acked-by: Douglas Gilbert <dgilbert@interlog.com>
Signed-off-by: Ye Bin <yebin10@huawei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
 		2021-11-25 09:48:29 +01:00
Documentation fscrypt: allow 256-bit master keys with AES-256-XTS 2021-11-18 19:16:11 +01:00
LICENSES LICENSES/dual/CC-BY-4.0: Git rid of "smart quotes" 2021-07-15 06:31:24 -06:00
arch MIPS: sni: Fix the build 2021-11-25 09:48:28 +01:00
block block: Hold invalidate_lock in BLKRESETZONE ioctl 2021-11-18 19:17:15 +01:00
certs certs: Add support for using elliptic curve keys for signing modules 2021-08-23 19:55:42 +03:00
crypto crypto: pcrypt - Delay write to padata->info 2021-11-18 19:16:44 +01:00
drivers scsi: scsi_debug: Fix out-of-bound read in resp_report_tgtpgs() 2021-11-25 09:48:29 +01:00
fs btrfs: zoned: allow preallocation for relocation inodes 2021-11-21 13:44:13 +01:00
include bus: ti-sysc: Add quirk handling for reinit on context lost 2021-11-25 09:48:24 +01:00
init init: make unknown command line param message clearer 2021-11-18 19:17:11 +01:00
ipc ipc: remove memcg accounting for sops objects in do_semtimedop() 2021-09-14 10:22:11 -07:00
kernel perf/core: Avoid put_page() when GUP fails 2021-11-21 13:44:14 +01:00
lib string: uninline memcpy_and_pad 2021-11-21 13:44:12 +01:00
mm mm, oom: do not trigger out_of_memory from the #PF 2021-11-18 19:17:16 +01:00
net SUNRPC: Partial revert of commit 6f9f17287e 2021-11-18 19:17:20 +01:00
samples samples/kretprobes: Fix return value if register_kretprobe() failed 2021-11-18 19:16:42 +01:00
scripts leaking_addresses: Always print a trailing newline 2021-11-18 19:16:16 +01:00
security fortify: Explicitly disable Clang support 2021-11-21 13:44:13 +01:00
sound ALSA: ISA: not for M68K 2021-11-25 09:48:28 +01:00
tools selftests/bpf: Fix also no-alu32 strobemeta selftest 2021-11-18 19:17:21 +01:00
usr .gitignore: prefix local generated files with a slash 2021-05-02 00:43:35 +09:00
virt KVM: Remove tlbs_dirty 2021-09-23 11:01:12 -04:00
.clang-format clang-format: Update with the latest for_each macro list 2021-05-12 23:32:39 +02:00
.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 .gitignore: ignore only top-level modules.builtin 2021-05-02 00:43:35 +09:00
.mailmap mailmap: add Andrej Shadura 2021-10-18 20:22:03 -10:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: Move Daniel Drake to credits 2021-09-21 08:34:58 +03:00
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 drm fixes for 5.15 final 2021-10-28 12:17:01 -07:00
Makefile Linux 5.15.4 2021-11-21 13:44:15 +01:00
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.