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Commit 0ba34c87 authored by Dave Martin's avatar Dave Martin Committed by Greg Kroah-Hartman
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mips/ptrace: Preserve previous registers for short regset write 



commit d614fd58a2834cfe4efa472c33c8f3ce2338b09b upstream.

Ensure that if userspace supplies insufficient data to PTRACE_SETREGSET
to fill all the registers, the thread's old registers are preserved.

Signed-off-by: default avatarDave Martin <Dave.Martin@arm.com>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 616fe993

arch/mips/kernel/ptrace.c

+2 −1
Original line number Diff line number Diff line
@@ -485,7 +485,8 @@ static int fpr_set(struct task_struct *target, 
					  &target->thread.fpu,

					  0, sizeof(elf_fpregset_t));



	for (i = 0; i < NUM_FPU_REGS; i++) {

	BUILD_BUG_ON(sizeof(fpr_val) != sizeof(elf_fpreg_t));

	for (i = 0; i < NUM_FPU_REGS && count >= sizeof(elf_fpreg_t); i++) {

		err = user_regset_copyin(&pos, &count, &kbuf, &ubuf,

					 &fpr_val, i * sizeof(elf_fpreg_t),

					 (i + 1) * sizeof(elf_fpreg_t));