diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2021-10-21 15:55:14 -0700 |
|---|---|---|
| committer | Borislav Petkov <bp@suse.de> | 2021-10-26 10:18:09 +0200 |
| commit | 9e798e9aa14c45fb94e47b30bf6347b369ce9df7 (patch) | |
| tree | 7fb104bf6f129909ec1d659032ed5038680b1951 /arch/x86/kernel/process.c | |
| parent | 53599b4d54b9b8dda1d537a558946869d2acbddc (diff) | |
x86/fpu: Prepare fpu_clone() for dynamically enabled features
The default portion of the parent's FPU state is saved in a child task.
With dynamic features enabled, the non-default portion is not saved in a
child's fpstate because these register states are defined to be
caller-saved. The new task's fpstate is therefore the default buffer.
Fork inherits the permission of the parent.
Also, do not use memcpy() when TIF_NEED_FPU_LOAD is set because it is
invalid when the parent has dynamic features.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Chang S. Bae <chang.seok.bae@intel.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20211021225527.10184-11-chang.seok.bae@intel.com
Diffstat (limited to 'arch/x86/kernel/process.c')
| -rw-r--r-- | arch/x86/kernel/process.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c index 97fea1649a5e..99025e32f105 100644 --- a/arch/x86/kernel/process.c +++ b/arch/x86/kernel/process.c @@ -157,7 +157,7 @@ int copy_thread(unsigned long clone_flags, unsigned long sp, unsigned long arg, frame->flags = X86_EFLAGS_FIXED; #endif - fpu_clone(p); + fpu_clone(p, clone_flags); /* Kernel thread ? */ if (unlikely(p->flags & PF_KTHREAD)) { |