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Xi Ruoyao e333bbb557 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: 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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2024-01-31 16:17:12 -08:00
..
syscalls arch: syscalls: simplify uapi/kapi directory creation 2022-03-31 12:03:46 +09:00
.gitignore
access-helper.h MIPS: Fix new sparse warnings 2021-04-07 16:11:05 +02:00
asm-offsets.c mips: rename PGD_ORDER to PGD_TABLE_ORDER 2022-07-17 17:14:42 -07:00
bmips_5xxx_init.S
bmips_vec.S
branch.c
cacheinfo.c drivers: base: cacheinfo: Get rid of DEFINE_SMP_CALL_CACHE_FUNCTION() 2021-09-01 10:29:10 +02:00
cevt-bcm1480.c
cevt-ds1287.c
cevt-gt641xx.c
cevt-r4k.c MIPS: Remove KVM_GUEST support 2021-03-10 15:18:40 +01:00
cevt-sb1250.c
cevt-txx9.c mips: kernel: convert comma to semicolon 2020-12-28 22:32:28 +01:00
cmpxchg.c MIPS: fix typos in comments 2022-05-04 22:22:59 +02:00
cps-vec-ns16550.S
cps-vec.S MIPS: CPS: don't create redundant .text.cps-vec section 2021-01-15 15:27:54 +01:00
cpu-probe.c MIPS: Loongson: Fix cpu_probe_loongson() again 2023-07-23 13:49:33 +02:00
cpu-r3k-probe.c MIPS: Remove TX39XX support 2022-03-01 10:07:22 +01:00
crash.c
crash_dump.c vmcore: convert copy_oldmem_page() to take an iov_iter 2022-04-29 14:37:59 -07:00
csrc-bcm1480.c
csrc-ioasic.c
csrc-r4k.c
csrc-sb1250.c
early_printk.c
early_printk_8250.c
elf.c mips: Call lose_fpu(0) before initializing fcr31 in mips_set_personality_nan 2024-01-31 16:17:12 -08:00
entry.S MIPS: Remove TX39XX support 2022-03-01 10:07:22 +01:00
fpu-probe.c
fpu-probe.h
ftrace.c MIPS: kernel: Remove not needed set_fs calls 2021-04-06 14:36:56 +02:00
genex.S MIPS: Remove TX39XX support 2022-03-01 10:07:22 +01:00
gpio_txx9.c
head.S MIPS: of: Introduce helper function to get DTB 2021-02-04 13:34:51 +01:00
i8253.c
idle.c MIPS: fix typos in comments 2022-05-04 22:22:59 +02:00
irq-gt641xx.c
irq-msc01.c
irq.c MIPS: Only use current_stack_pointer on GCC 2022-03-14 15:02:53 +01:00
irq_txx9.c MIPS: Remove TX39XX support 2022-03-01 10:07:22 +01:00
jump_label.c MIPS: jump_label: Fix compat branch range check 2022-11-11 15:46:03 +01:00
kgdb.c MIPS: kernel: Drop kgdb_call_nmi_hook 2021-02-15 12:23:54 +01:00
kprobes.c MIPS: Use NOKPROBE_SYMBOL() instead of __kprobes annotation 2022-05-12 18:00:51 +02:00
linux32.c
machine_kexec.c
Makefile kbuild: use obj-y instead extra-y for objects placed at the head 2022-10-02 18:04:05 +09:00
mcount.S
mips-cm.c mips: cm: Convert to bitfield API to fix out-of-bounds access 2021-11-02 10:53:52 +01:00
mips-cpc.c mips: cpc: Fix refcount leak in mips_cpc_default_phys_base 2022-04-26 15:11:25 +02:00
mips-mt-fpaff.c MIPS: Replace deprecated CPU-hotplug functions. 2021-08-05 10:57:01 +02:00
mips-mt.c mips: rename mt_init to mips_mt_init 2022-07-29 18:07:13 -07:00
mips-r2-to-r6-emul.c MIPS: Fix build error due to PTR used in more places 2022-01-27 09:04:19 +01:00
module.c jump_label: mips: move module NOP patching into arch code 2022-06-24 09:48:55 +02:00
octeon_switch.S
perf_event.c
perf_event_mipsxx.c MIPS: fix typos in comments 2022-05-04 22:22:59 +02:00
perf_regs.c MIPS: kernel: Support extracting off-line stack traces from user-space with perf 2021-02-04 21:55:45 +01:00
pm-cps.c
pm.c
probes-common.h
proc.c MIPS: cpuinfo: Fix a warning for CONFIG_CPUMASK_OFFSTACK 2022-07-14 11:49:40 +02:00
process.c MIPS: kernel: Clear FPU states when setting up kernel threads 2023-12-13 18:39:28 +01:00
prom.c MIPS: move from strlcpy with unused retval to strscpy 2022-09-12 15:34:04 +02:00
ptrace.c ptrace: Create ptrace_report_syscall_{entry,exit} in ptrace.h 2022-03-10 13:35:08 -06:00
ptrace32.c
r4k-bugs64.c MIPS: remove asm/war.h 2022-02-22 09:35:49 +01:00
r4k_fpu.S MIPS: Fix build error due to PTR used in more places 2022-01-27 09:04:19 +01:00
r4k_switch.S
r2300_fpu.S MIPS: Fix build error due to PTR used in more places 2022-01-27 09:04:19 +01:00
r2300_switch.S
relocate.c MIPS: move from strlcpy with unused retval to strscpy 2022-09-12 15:34:04 +02:00
relocate_kernel.S MIPS: fix duplicate definitions for exported symbols 2022-11-11 15:44:44 +01:00
reset.c mips: Use do_kernel_power_off() 2022-05-19 19:30:31 +02:00
rtlx-cmp.c
rtlx-mt.c
rtlx.c
scall32-o32.S MIPS: remove asm/war.h 2022-02-22 09:35:49 +01:00
scall64-n32.S MIPS: Fix build error due to PTR used in more places 2022-01-27 09:04:19 +01:00
scall64-n64.S MIPS: remove asm/war.h 2022-02-22 09:35:49 +01:00
scall64-o32.S MIPS: Fix build error due to PTR used in more places 2022-01-27 09:04:19 +01:00
segment.c mips: kernel: convert to DEFINE_SHOW_ATTRIBUTE 2022-09-19 16:40:17 +02:00
setup.c mips: Fix incorrect max_low_pfn adjustment 2024-01-25 15:27:45 -08:00
signal-common.h
signal.c ptrace: Cleanups for v5.18 2022-03-28 17:29:53 -07:00
signal32.c
signal_n32.c MIPS: remove asm/war.h 2022-02-22 09:35:49 +01:00
signal_o32.c
smp-bmips.c MIPS: BMIPS: Remove use of irq_cpu_offline 2021-10-20 20:06:32 +01:00
smp-cmp.c
smp-cps.c MIPS: No need to check CPU 0 in cps_cpu_disable() 2020-12-28 22:34:09 +01:00
smp-mt.c
smp-up.c
smp.c mips/smp: Call rcutree_report_cpu_starting() earlier 2024-01-25 15:27:39 -08:00
spinlock_test.c mips: kernel: use DEFINE_DEBUGFS_ATTRIBUTE with debugfs_create_file_unsafe() 2021-03-14 14:09:49 +01:00
spram.c
stacktrace.c
sync-r4k.c
syscall.c MIPS: Fix build error due to PTR used in more places 2022-01-27 09:04:19 +01:00
sysrq.c
time.c MIPS: Fix CP0 counter erratum detection for R4k CPUs 2022-04-29 15:52:00 +02:00
topology.c drivers/base/node: consolidate node device subsystem initialization in node_dev_init() 2022-03-22 15:57:10 -07:00
traps.c MIPS: fix fortify panic when copying asm exception handlers 2022-03-07 13:09:28 +01:00
unaligned.c MIPS: Handle address errors for accesses above CPU max virtual user address 2022-02-25 09:36:05 +01:00
uprobes.c MIPS: Fix fall-through warnings for Clang 2021-10-13 14:47:42 -05:00
vdso.c treewide: use prandom_u32_max() when possible, part 1 2022-10-11 17:42:55 -06:00
vmlinux.lds.S MIPS: Define RUNTIME_DISCARD_EXIT in LD script 2023-04-26 14:28:42 +02:00
vpe-cmp.c MIPS: vpe-cmp: fix possible memory leak while module exiting 2022-12-31 13:31:56 +01:00
vpe-mt.c MIPS: vpe-mt: fix possible memory leak while module exiting 2022-12-31 13:31:56 +01:00
vpe.c MIPS: vpe: Remove vpe_getcwd 2021-01-27 21:49:16 +01:00
watch.c