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Filename Latest commit message Latest commit date
Ammar Faizi ea8b2ecc92 x86/delay: Fix the wrong asm constraint in delay_loop()
[ Upstream commit b86eb74098a92afd789da02699b4b0dd3f73b889 ]

The asm constraint does not reflect the fact that the asm statement can
modify the value of the local variable loops. Which it does.

Specifying the wrong constraint may lead to undefined behavior, it may
clobber random stuff (e.g. local variable, important temporary value in
regs, etc.). This is especially dangerous when the compiler decides to
inline the function and since it doesn't know that the value gets
modified, it might decide to use it from a register directly without
reloading it.

Change the constraint to "+a" to denote that the first argument is an
input and an output argument.

  [ bp: Fix typo, massage commit message. ]

Fixes: e01b70ef3e ("x86: fix bug in arch/i386/lib/delay.c file, delay_loop function")
Signed-off-by: Ammar Faizi <ammarfaizi2@gnuweeb.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lore.kernel.org/r/20220329104705.65256-2-ammarfaizi2@gnuweeb.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
2022-06-14 18:11:31 +02:00
arch x86/delay: Fix the wrong asm constraint in delay_loop() 2022-06-14 18:11:31 +02:00
block block: return ELEVATOR_DISCARD_MERGE if possible 2022-05-25 09:14:38 +02:00
certs
crypto crypto: ecrdsa - Fix incorrect use of vli_cmp 2022-06-06 08:33:50 +02:00
Documentation hwmon: Make chip parameter for with_info API mandatory 2022-06-14 18:11:29 +02:00
drivers drm/bridge: adv7511: clean up CEC adapter when probe fails 2022-06-14 18:11:31 +02:00
fs fat: add ratelimit to fat*_ent_bread() 2022-06-14 18:11:30 +02:00
include drm: fix EDID struct for old ARM OABI format 2022-06-14 18:11:31 +02:00
init
ipc
kernel dma-debug: change allocation mode from GFP_NOWAIT to GFP_ATIOMIC 2022-06-14 18:11:28 +02:00
lib assoc_array: Fix BUG_ON during garbage collect 2022-06-06 08:33:50 +02:00
LICENSES
mm zsmalloc: fix races between asynchronous zspage free and page migration 2022-06-06 08:33:50 +02:00
net rxrpc: Return an error to sendmsg if call failed 2022-06-14 18:11:29 +02:00
samples
scripts
security lockdown: also lock down previous kgdb use 2022-06-06 08:33:48 +02:00
sound ASoC: mediatek: Fix missing of_node_put in mt2701_wm8960_machine_probe 2022-06-14 18:11:31 +02:00
tools selftests/bpf: fix btf_dump/btf_dump due to recent clang change 2022-06-14 18:11:29 +02:00
usr
virt
.clang-format
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COPYING
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Makefile Linux 5.4.197 2022-06-06 08:33:51 +02:00
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.