From 59be5c35850171e307ca5d3d703ee9ff4096b948 Mon Sep 17 00:00:00 2001 From: Xi Ruoyao Date: Sat, 27 Jan 2024 05:05:57 +0800 Subject: [PATCH] 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 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: 9b26616c8d9d ("MIPS: Respect the ISA level in FCSR handling") Cc: stable@vger.kernel.org Signed-off-by: Xi Ruoyao Signed-off-by: Thomas Bogendoerfer --- arch/mips/kernel/elf.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/arch/mips/kernel/elf.c b/arch/mips/kernel/elf.c index 5582a4ca1e9e..7aa2c2360ff6 100644 --- a/arch/mips/kernel/elf.c +++ b/arch/mips/kernel/elf.c @@ -11,6 +11,7 @@ #include #include +#include #ifdef CONFIG_MIPS_FP_SUPPORT @@ -309,6 +310,11 @@ void mips_set_personality_nan(struct arch_elf_state *state) struct cpuinfo_mips *c = &boot_cpu_data; struct task_struct *t = current; + /* Do this early so t->thread.fpu.fcr31 won't be clobbered in case + * we are preempted before the lose_fpu(0) in start_thread. + */ + lose_fpu(0); + t->thread.fpu.fcr31 = c->fpu_csr31; switch (state->nan_2008) { case 0: -- 2.20.1