Commit 2d16a187 authored by Thomas Gleixner's avatar Thomas Gleixner Committed by Borislav Petkov
Browse files

x86/process: Clone FPU in copy_thread() 



There is no reason to clone FPU in arch_dup_task_struct(). Quite the
contrary - it prevents optimizations. Move it to copy_thread().

Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Signed-off-by: default avatarBorislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20211015011538.780714235@linutronix.de
parent 01f9f62d

arch/x86/kernel/process.c

+3 −1
Original line number Diff line number Diff line
@@ -87,7 +87,7 @@ int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src) 
#ifdef CONFIG_VM86

	dst->thread.vm86 = NULL;

#endif

	return fpu_clone(dst);

	return 0;

}



/*
@@ -154,6 +154,8 @@ int copy_thread(unsigned long clone_flags, unsigned long sp, unsigned long arg, 
	frame->flags = X86_EFLAGS_FIXED;

#endif



	fpu_clone(p);



	/* Kernel thread ? */

	if (unlikely(p->flags & PF_KTHREAD)) {

		p->thread.pkru = pkru_get_init_value();