Xi Ruoyao
200d17b226
mips: Call lose_fpu(0) before initializing fcr31 in mips_set_personality_nan ...
commit 59be5c35850171e307ca5d3d703ee9ff4096b948 upstream.
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: 9b26616c8dstable@vger.kernel.org
Signed-off-by: Xi Ruoyao <xry111@xry111.site>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2024-02-23 08:24:53 +01:00
MIPS: Alchemy: Fix an out-of-bound access in db1550_dev_setup()
2024-01-25 14:34:30 -08:00
MIPS: BCM47XX: Cast memcmp() of function to (void *)
2022-10-26 13:22:47 +02:00
MIPS: BCM63xx: Add check for NULL for clk in clk_enable
2023-01-18 11:40:58 +01:00
mips: bmips: BCM6358: disable RAC flush for TP1
2023-04-05 11:16:43 +02:00
mips: disable branch profiling in boot/decompress.o
2021-07-20 16:10:53 +02:00
MIPS: OCTEON: warn only once if deprecated link status is being used
2023-01-18 11:40:58 +01:00
Remove DECnet support from kernel
2023-06-21 15:44:10 +02:00
mips: DEC: honor CONFIG_MIPS_FP_SUPPORT=n
2022-04-15 14:18:15 +02:00
MIPS: fw: Allow firmware to pass a empty env
2023-05-17 11:35:32 +02:00
MIPS: generic/yamon-dt: fix uninitialized variable error
2021-11-26 10:47:19 +01:00
MIPS: cpu-features: Use boot_cpu_type for CPU type based features
2023-08-30 16:27:21 +02:00
dma-mapping: drop the dev argument to arch_sync_dma_for_*
2023-04-05 11:16:43 +02:00
MIPS: fix build with gcc-12
2022-05-18 09:47:28 +02:00
mips: Call lose_fpu(0) before initializing fcr31 in mips_set_personality_nan
2024-02-23 08:24:53 +01:00
MIPS: KVM: Fix a build warning about variable set but not used
2023-12-08 08:44:24 +01:00
MIPS: vpe-mt: drop physical_memsize
2023-03-11 16:43:52 +01:00
treewide: Replace DECLARE_TASKLET() with DECLARE_TASKLET_OLD()
2023-04-20 12:07:32 +02:00
treewide: Remove uninitialized_var() usage
2023-06-09 10:29:01 +02:00
MIPS: Loongson32: Fix PHY-mode being left unspecified
2022-09-28 11:04:06 +02:00
MIPS: loongsoon64: Reserve memory below starting pfn to prevent Oops
2021-07-19 08:53:13 +02:00
treewide: Remove uninitialized_var() usage
2023-06-09 10:29:01 +02:00
MIPS: Malta: fix alignment of the devicetree buffer
2021-09-22 12:26:26 +02:00
bpf, mips: Validate conditional branch offsets
2021-10-13 10:08:17 +02:00
MIPS: pci-legacy: stop using of_pci_range_to_resource
2021-05-14 09:44:30 +02:00
MIPS: pic32: treat port as signed integer
2022-12-08 11:22:57 +01:00
MIPS: Use address-of operator on section symbols
2022-05-15 19:54:46 +02:00
MIPS: RB532: fix return value of __setup handler
2022-04-15 14:18:16 +02:00
MIPS: sni: Fix the build
2021-11-26 10:47:16 +01:00
MIPS: VDSO: Use CLANG_FLAGS instead of filtering out '--target='
2021-03-07 12:20:41 +01:00
MIPS: Remove repetitive increase irq_err_count
2022-06-29 08:58:46 +02:00
mips/cpu: Switch to arch_cpu_finalize_init()
2023-08-08 19:56:34 +02:00
mips: Fix non-POSIX regexp
2021-08-12 13:20:57 +02:00
200d17b226