Peter Zijlstra b31bac0619 x86/iopl: Fake iopl(3) CLI/STI usage ... commit b968e84b509da593c50dc3db679e1d33de701f78 upstream. 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 Signed-off-by: Ondrej Zary <linux@zary.sk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2021-11-21 13:46:36 +01:00
..
.gitignore
atomic64_32.c
atomic64_386_32.S
atomic64_cx8_32.S
cache-smp.c
checksum_32.S	i386: propagate the calling conventions change down to csum_partial_copy_generic()	2020-08-20 15:45:18 -04:00
clear_page_64.S
cmdline.c	treewide: Use fallthrough pseudo-keyword	2020-08-23 17:36:59 -05:00
cmpxchg8b_emu.S
cmpxchg16b_emu.S
copy_mc_64.S	x86/copy_mc: Introduce copy_mc_enhanced_fast_string()	2020-10-06 11:37:36 +02:00
copy_mc.c	x86/copy_mc: Introduce copy_mc_enhanced_fast_string()	2020-10-06 11:37:36 +02:00
copy_page_64.S
copy_user_64.S	x86/mce: Avoid tail copy when machine check terminated a copy from user	2020-10-07 11:26:56 +02:00
cpu.c
csum-copy_64.S	amd64: switch csum_partial_copy_generic() to new calling conventions	2020-08-20 15:45:22 -04:00
csum-partial_64.c
csum-wrappers_64.c	amd64: switch csum_partial_copy_generic() to new calling conventions	2020-08-20 15:45:22 -04:00
delay.c
error-inject.c
getuser.S	Merge branch 'work.set_fs' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2020-10-22 09:59:21 -07:00
hweight.S
inat.c
insn-eval.c	x86/iopl: Fake iopl(3) CLI/STI usage	2021-11-21 13:46:36 +01:00
insn.c
iomap_copy_64.S
iomem.c
kaslr.c
Makefile	* Extend the recovery from MCE in kernel space also to processes which	2020-10-12 10:14:38 -07:00
memcpy_32.c
memcpy_64.S	x86/lib: Change .weak to SYM_FUNC_START_WEAK for arch/x86/lib/mem*_64.S	2020-11-04 12:30:20 +01:00
memmove_64.S	x86/lib: Change .weak to SYM_FUNC_START_WEAK for arch/x86/lib/mem*_64.S	2020-11-04 12:30:20 +01:00
memset_64.S	x86/lib: Change .weak to SYM_FUNC_START_WEAK for arch/x86/lib/mem*_64.S	2020-11-04 12:30:20 +01:00
misc.c
mmx_32.c	x86/mmx: Use KFPU_387 for MMX string operations	2021-01-27 11:55:13 +01:00
msr-reg-export.c
msr-reg.S
msr-smp.c	x86/msr: Fix wr/rdmsr_safe_regs_on_cpu() prototypes	2021-05-22 11:40:51 +02:00
msr.c
putuser.S	Merge branch 'work.set_fs' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2020-10-22 09:59:21 -07:00
retpoline.S
string_32.c
strstr_32.c
usercopy_32.c
usercopy_64.c	* Extend the recovery from MCE in kernel space also to processes which	2020-10-12 10:14:38 -07:00
usercopy.c
x86-opcode-map.txt