Peter Zijlstra b968e84b50 x86/iopl: Fake iopl(3) CLI/STI usage ... Since commit c8137ace56 ("x86/iopl: Restrict iopl() permission scope") it's possible to emulate iopl(3) using ioperm(), except for the CLI/STI usage. Userspace CLI/STI usage is very dubious (read broken), since any exception taken during that window can lead to rescheduling anyway (or worse). The IOPL(2) manpage even states that usage of CLI/STI is highly discouraged and might even crash the system. Of course, that won't stop people and HP has the dubious honour of being the first vendor to be found using this in their hp-health package. In order to enable this 'software' to still 'work', have the #GP treat the CLI/STI instructions as NOPs when iopl(3). Warn the user that their program is doing dubious things. Fixes: a24ca99768 ("x86/iopl: Remove legacy IOPL option") Reported-by: Ondrej Zary <linux@zary.sk> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Cc: stable@kernel.org # v5.5+ Link: https://lkml.kernel.org/r/20210918090641.GD5106@worktop.programming.kicks-ass.net		2021-09-21 13:52:18 +02:00
..
boot	Kbuild updates for v5.15	2021-09-03 15:33:47 -07:00
configs	configs: remove the obsolete CONFIG_INPUT_POLLDEV	2021-09-08 11:50:28 -07:00
crypto	crypto: aesni - xts_crypt() return if walk.nbytes is 0	2021-08-27 16:30:19 +08:00
entry	compat: remove some compat entry points	2021-09-08 15:32:35 -07:00
events	perf/x86/amd/ibs: Add bitfield definitions in new <asm/amd-ibs.h> header	2021-08-26 09:14:36 +02:00
hyperv
ia32	binfmt: remove in-tree usage of MAP_DENYWRITE	2021-09-03 18:42:01 +02:00
include	x86/iopl: Fake iopl(3) CLI/STI usage	2021-09-21 13:52:18 +02:00
kernel	x86/iopl: Fake iopl(3) CLI/STI usage	2021-09-21 13:52:18 +02:00
kvm	ARM:	2021-09-07 13:40:51 -07:00
lib	x86/iopl: Fake iopl(3) CLI/STI usage	2021-09-21 13:52:18 +02:00
math-emu
mm	Merge branch 'akpm' (patches from Andrew)	2021-09-08 12:55:35 -07:00
net
pci	pci-v5.15-changes	2021-09-07 19:13:42 -07:00
platform
power	x86/power: Fix kernel-doc warnings in cpu.c	2021-08-12 10:15:40 +02:00
purgatory
ras
realmode	memblock: make memblock_find_in_range method private	2021-09-03 09:58:17 -07:00
tools	- Remove cc-option checks which are old and already supported by the	2021-08-30 13:27:16 -07:00
um	um: fix stub location calculation	2021-08-26 22:28:03 +02:00
video
xen	xen: remove stray preempt_disable() from PV AP startup code	2021-09-01 10:39:27 +02:00
.gitignore
Kbuild
Kconfig	Tracing updates for 5.15:	2021-09-05 11:50:41 -07:00
Kconfig.assembler
Kconfig.cpu
Kconfig.debug	tracing: Refactor TRACE_IRQFLAGS_SUPPORT in Kconfig	2021-08-16 11:37:21 -04:00
Makefile	Kbuild updates for v5.15	2021-09-03 15:33:47 -07:00
Makefile.um
Makefile_32.cpu	x86: remove cc-option-yn test for -mtune=	2021-09-03 08:17:20 +09:00