Commit ce2a1e67 authored May 25, 2015 by Ingo Molnar

x86/fpu: Add debugging check to fpu__restore()

The copy_fpstate_to_fpregs() function is never supposed to fail,
so add a debugging check to its call site in fpu__restore().

Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Bobby Powers <bobbypowers@gmail.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>

parent 343763c3

arch/x86/kernel/fpu/core.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -371,6 +371,8 @@ void fpu__restore(struct fpu *fpu)
		kernel_fpu_disable();
		fpregs_activate(fpu);
		if (unlikely(copy_fpstate_to_fpregs(fpu))) {
		/* Copying the kernel state to FPU registers should never fail: */
		WARN_ON_FPU(1);
		fpu__clear(fpu);
		force_sig_info(SIGSEGV, SEND_SIG_PRIV, current);
		} else {

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