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Kyle Huey 3c1940c549 x86/fpu: Emulate XRSTOR's behavior if the xfeatures PKRU bit is not set 
commit d7e5aceace upstream

The hardware XRSTOR instruction resets the PKRU register to its hardware
init value (namely 0) if the PKRU bit is not set in the xfeatures mask.
Emulating that here restores the pre-5.14 behavior for PTRACE_SET_REGSET
with NT_X86_XSTATE, and makes sigreturn (which still uses XRSTOR) and
behave identically.

Fixes: e84ba47e31 ("x86/fpu: Hook up PKRU into ptrace()")
Signed-off-by: Kyle Huey <me@kylehuey.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Link: https://lore.kernel.org/all/20221115230932.7126-6-khuey%40kylehuey.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2023-01-14 10:23:27 +01:00
..
boot x86: link vdso and boot with -z noexecstack --no-warn-rwx-segments 2022-08-17 14:22:45 +02:00
configs x86/kbuild: Enable CONFIG_KALLSYMS_ALL=y in the defconfigs 2022-01-27 11:04:56 +01:00
crypto crypto: blake2s - remove shash module 2022-08-17 14:24:19 +02:00
entry x86/vdso: Conditionally export __vdso_sgx_enter_enclave() 2022-12-19 12:36:38 +01:00
events perf/x86/intel/uncore: Clear attr_update properly 2023-01-12 11:58:50 +01:00
hyperv x86/hyperv: Remove unregister syscore call from Hyper-V cleanup 2022-12-31 13:14:39 +01:00
ia32 binfmt: remove in-tree usage of MAP_DENYWRITE 2021-09-03 18:42:01 +02:00
include x86/fpu: Add a pkru argument to copy_uabi_from_kernel_to_xstate(). 2023-01-14 10:23:27 +01:00
kernel x86/fpu: Emulate XRSTOR's behavior if the xfeatures PKRU bit is not set 2023-01-14 10:23:27 +01:00
kvm KVM: nVMX: Properly expose ENABLE_USR_WAIT_PAUSE control to L1 2023-01-12 11:58:54 +01:00
lib x86/entry_32: Fix segment exceptions 2022-07-29 17:25:33 +02:00
math-emu x86: Prepare asm files for straight-line-speculation 2022-05-15 20:18:49 +02:00
mm x86/ioremap: Fix page aligned size calculation in __ioremap_caller() 2022-12-02 17:41:09 +01:00
net x86/extable: Extend extable functionality 2022-07-29 17:25:26 +02:00
pci x86/PCI: Fix ALi M1487 (IBC) PIRQ router link value interpretation 2022-06-09 10:22:46 +02:00
platform x86/olpc: fix 'logical not is only applied to the left hand side' 2022-08-17 14:24:18 +02:00
power x86/pm: Add enumeration check before spec MSRs save/restore setup 2022-12-02 17:41:09 +01:00
purgatory kernel.h: split out panic and oops helpers 2021-07-01 11:06:04 -07:00
ras treewide: replace '---help---' in Kconfig files with 'help' 2020-06-14 01:57:21 +09:00
realmode x86/mm: Flush global TLB when switching to trampoline page-table 2022-01-27 11:04:35 +01:00
tools - Remove cc-option checks which are old and already supported by the 2021-08-30 13:27:16 -07:00
um arch: um: Mark the stack non-executable to fix a binutils warning 2022-10-12 09:53:27 +02:00
video treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
xen x86/xen: Fix memory leak in xen_init_lock_cpu() 2022-12-31 13:14:04 +01:00
.gitignore .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
Kbuild treewide: Add SPDX license identifier - Kbuild 2019-05-30 11:32:33 -07:00
Kconfig x86/Kconfig: Drop check for -mabi=ms for CONFIG_EFI_STUB 2022-10-29 10:12:58 +02:00
Kconfig.assembler x86/delay: Introduce TPAUSE delay 2020-05-07 16:06:20 +02:00
Kconfig.cpu treewide: replace '---help---' in Kconfig files with 'help' 2020-06-14 01:57:21 +09:00
Kconfig.debug arch: make TRACE_IRQFLAGS_NMI_SUPPORT generic 2022-08-17 14:23:00 +02:00
Makefile x86/realmode: build with -D__DISABLE_EXPORTS 2022-07-23 12:53:56 +02:00
Makefile.um um: allow not setting extra rpaths in the linux binary 2021-06-17 21:54:15 +02:00
Makefile_32.cpu x86/build: Do not add -falign flags unconditionally for clang 2021-09-19 10:35:53 +09:00