MIPS: Also verify sizeof `elf_fpreg_t' with PTRACE_SETREGSET

Complement commit d614fd58a283 ("mips/ptrace: Preserve previous
registers for short regset write") and like with the PTRACE_GETREGSET
ptrace(2) request also apply a BUILD_BUG_ON check for the size of the
`elf_fpreg_t' type in the PTRACE_SETREGSET request handler.

Signed-off-by: Maciej W. Rozycki <macro@mips.com>
Fixes: d614fd58a283 ("mips/ptrace: Preserve previous registers for short regset write")
Cc: James Hogan <james.hogan@mips.com>
Cc: Paul Burton <Paul.Burton@mips.com>
Cc: Alex Smith <alex@alex-smith.me.uk>
Cc: Dave Martin <Dave.Martin@arm.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Cc: stable@vger.kernel.org # v4.11+
Patchwork: https://patchwork.linux-mips.org/patch/17929/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

diff --git a/arch/mips/kernel/ptrace.c b/arch/mips/kernel/ptrace.c
index 0a93959..2569089 100644 (file)
--- a/arch/mips/kernel/ptrace.c
+++ b/arch/mips/kernel/ptrace.c
@@ -447,6 +447,7 @@ static int fpr_get_msa(struct task_struct *target,
        u64 fpr_val;
        int err;
 
+       BUILD_BUG_ON(sizeof(fpr_val) != sizeof(elf_fpreg_t));
        for (i = 0; i < NUM_FPU_REGS; i++) {
                fpr_val = get_fpr64(&target->thread.fpu.fpr[i], 0);
                err = user_regset_copyout(pos, count, kbuf, ubuf,