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Petteri Aimonen 7ad816762f x86/fpu: Reset MXCSR to default in kernel_fpu_begin() 
Previously, kernel floating point code would run with the MXCSR control
register value last set by userland code by the thread that was active
on the CPU core just before kernel call. This could affect calculation
results if rounding mode was changed, or a crash if a FPU/SIMD exception
was unmasked.

Restore MXCSR to the kernel's default value.

 [ bp: Carve out from a bigger patch by Petteri, add feature check, add
   FNINIT call too (amluto). ]

Signed-off-by: Petteri Aimonen <jpa@git.mail.kapsi.fi>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://bugzilla.kernel.org/show_bug.cgi?id=207979
Link: https://lkml.kernel.org/r/20200624114646.28953-2-bp@alien8.de
 		2020-06-29 10:02:00 +02:00
..
boot Rebase locking/kcsan to locking/urgent 2020-06-11 20:02:46 +02:00
configs compiler: remove CONFIG_OPTIMIZE_INLINING entirely 2020-04-07 10:43:42 -07:00
crypto There are a lot of objtool changes in this cycle, all across the map: 2020-06-01 13:13:00 -07:00
entry The X86 entry, exception and interrupt code rework 2020-06-13 10:05:47 -07:00
events treewide: replace '---help---' in Kconfig files with 'help' 2020-06-14 01:57:21 +09:00
hyperv x86/entry: Convert various hypervisor vectors to IDTENTRY_SYSVEC 2020-06-11 15:15:15 +02:00
ia32 Merge branch 'exec-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace 2020-06-04 14:07:08 -07:00
include x86/fpu: Reset MXCSR to default in kernel_fpu_begin() 2020-06-29 10:02:00 +02:00
kernel x86/fpu: Reset MXCSR to default in kernel_fpu_begin() 2020-06-29 10:02:00 +02:00
kvm Kbuild updates for v5.8 (2nd) 2020-06-13 13:29:16 -07:00
lib Rebase locking/kcsan to locking/urgent 2020-06-11 20:02:46 +02:00
math-emu Merge branch 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2019-11-26 10:42:40 -08:00
mm maccess: rename probe_kernel_address to get_kernel_nofault 2020-06-18 11:14:40 -07:00
net bpf, i386: Remove unneeded conversion to bool 2020-05-07 16:29:14 +02:00
oprofile x86: Use pr_warn instead of pr_warning 2019-10-18 15:00:18 +02:00
pci maccess: rename probe_kernel_address to get_kernel_nofault 2020-06-18 11:14:40 -07:00
platform x86/platform/intel-mid: convert to use i2c_new_client_device() 2020-06-19 09:20:25 +02:00
power mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
purgatory x86/purgatory: Add -fno-stack-protector 2020-06-16 17:05:07 -07:00
ras treewide: replace '---help---' in Kconfig files with 'help' 2020-06-14 01:57:21 +09:00
realmode Rebase locking/kcsan to locking/urgent 2020-06-11 20:02:46 +02:00
tools .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
um mmap locking API: use coccinelle to convert mmap_sem rwsem call sites 2020-06-09 09:39:14 -07:00
video
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xen maccess: rename probe_kernel_{read,write} to copy_{from,to}_kernel_nofault 2020-06-17 10:57:41 -07:00
.gitignore .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
Kbuild
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Kconfig Kbuild updates for v5.8 (2nd) 2020-06-13 13:29:16 -07:00
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 treewide: replace '---help---' in Kconfig files with 'help' 2020-06-14 01:57:21 +09:00
Makefile x86/boot/build: Make 'make bzlilo' not depend on vmlinux or $(obj)/bzImage 2020-04-21 18:10:28 +02:00
Makefile.um
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Makefile_32.cpu x86/math-emu: Limit MATH_EMULATION to 486SX compatibles 2019-10-03 10:51:17 +02:00