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linux/arch/mips
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Xi Ruoyao 59be5c3585 mips: Call lose_fpu(0) before initializing fcr31 in mips_set_personality_nan 
If we still own the FPU after initializing fcr31, when we are preempted
the dirty value in the FPU will be read out and stored into fcr31,
clobbering our setting.  This can cause an improper floating-point
environment after execve().  For example:

    zsh% cat measure.c
    #include <fenv.h>
    int main() { return fetestexcept(FE_INEXACT); }
    zsh% cc measure.c -o measure -lm
    zsh% echo $((1.0/3)) # raising FE_INEXACT
    0.33333333333333331
    zsh% while ./measure; do ; done
    (stopped in seconds)

Call lose_fpu(0) before setting fcr31 to prevent this.

Closes: https://lore.kernel.org/linux-mips/7a6aa1bbdbbe2e63ae96ff163fab0349f58f1b9e.camel@xry111.site/
Fixes: 9b26616c8d ("MIPS: Respect the ISA level in FCSR handling")
Cc: stable@vger.kernel.org
Signed-off-by: Xi Ruoyao <xry111@xry111.site>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
2024-01-27 11:08:04 +01:00
..
alchemy MIPS: Alchemy: Fix missing prototypes 2024-01-22 10:32:36 +01:00
ath25 MIPS: ath25: Constify static irq_domain_ops 2022-02-22 09:39:03 +01:00
ath79 MIPS: ath79: remove obsolete ATH79_DEV_* configs 2023-03-17 10:28:04 +01:00
bcm47xx MIPS: Fix typos 2024-01-08 10:39:12 +01:00
bcm63xx MIPS: BCM63XX: Fix missing prototypes 2024-01-26 10:33:20 +01:00
bmips MIPS: Explicitly include correct DT includes 2023-07-25 10:42:01 +02:00
boot Just cleanups and fixes 2024-01-17 11:20:50 -08:00
cavium-octeon Just cleanups and fixes 2024-01-17 11:20:50 -08:00
cobalt MIPS: Cobalt: Fix missing prototypes 2024-01-22 10:32:21 +01:00
configs vfs-6.8.netfs 2024-01-19 09:10:23 -08:00
crypto crypto: mips/crc32 - remove redundant setting of alignmask to 0 2023-10-27 18:04:24 +08:00
dec MIPS: fix typos in comments 2022-05-04 22:22:59 +02:00
fw MIPS: fw arc: Fix missing prototypes 2024-01-22 11:12:01 +01:00
generic mips: ingenic: Enable EXT/2 divider on JZ4750/55/60 if EXT is 24 MHz 2023-06-09 09:54:17 +02:00
include MIPS: Alchemy: Fix missing prototypes 2024-01-22 10:32:36 +01:00
ingenic
jazz vgacon, arch/*: remove unused screen_info definitions 2023-10-17 10:17:02 +02:00
kernel mips: Call lose_fpu(0) before initializing fcr31 in mips_set_personality_nan 2024-01-27 11:08:04 +01:00
kvm Generic: 2024-01-17 13:03:37 -08:00
lantiq MIPS: lantiq: register smp_ops on non-smp platforms 2024-01-26 10:36:21 +01:00
lib mips: implement xor_unlock_is_negative_byte 2023-10-18 14:34:17 -07:00
loongson2ef MIPS: Fix typos 2024-01-08 10:39:12 +01:00
loongson32 MIPS: loongson32: Remove dma.h and nand.h 2023-10-06 10:10:13 +02:00
loongson64 MIPS: loongson64: set nid for reserved memblock region 2024-01-27 11:07:57 +01:00
math-emu MIPS: Fix comment typo 2022-09-12 15:33:24 +02:00
mm IOMMU Updates for Linux v6.8 2024-01-18 15:16:57 -08:00
mti-malta vgacon: clean up global screen_info instances 2023-10-17 10:17:02 +02:00
n64
net MIPS: Fix typos 2024-01-08 10:39:12 +01:00
pci Just cleanups and fixes 2024-01-17 11:20:50 -08:00
pic32 MIPS: Fixup explicit DT include clean-up 2023-07-28 11:41:09 +02:00
power mips: suspend: include linux/suspend.h as needed 2023-12-10 17:21:41 -08:00
ralink MIPS: Fix typos 2024-01-08 10:39:12 +01:00
rb532 MIPS: rb532: move GPIOD definition into C-files 2022-03-30 20:26:26 +02:00
sgi-ip22 driver core: make struct bus_type.uevent() take a const * 2023-01-27 13:45:52 +01:00
sgi-ip27 MIPS: sgi-ip27: Fix missing prototypes 2024-01-22 11:11:49 +01:00
sgi-ip30 MIPS: sgi-ip30: Fix missing prototypes 2024-01-22 11:12:08 +01:00
sgi-ip32 MIPS: sgi-ip32: Fix missing prototypes 2024-01-22 11:12:19 +01:00
sibyte vgacon: fix mips/sibyte build regression 2023-10-24 08:54:37 +02:00
sni vgacon: clean up global screen_info instances 2023-10-17 10:17:02 +02:00
tools MIPS: fix typos in comments 2022-05-04 22:22:59 +02:00
txx9 MIPS: Fix typos 2024-01-08 10:39:12 +01:00
vdso arch: vdso: consolidate gettime prototypes 2023-11-23 11:32:32 +01:00
Kbuild arch: turn off -Werror for architectures with known warnings 2023-12-10 17:21:33 -08:00
Kbuild.platforms MIPS: AR7: remove platform 2023-10-19 10:39:46 +02:00
Kconfig MIPS: Loongson64: Enable DMA noncoherent support 2023-12-05 18:45:14 +01:00
Kconfig.debug
Makefile Revert MIPS: Loongson: Fix build error when make modules_install 2023-07-25 10:42:01 +02:00
Makefile.postlink kbuild: remove ARCH_POSTLINK from module builds 2023-10-28 21:10:08 +09:00