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.
Cc: stable@vger.kernel.org # v4.11+ Fixes: d614fd58a283 ("mips/ptrace: Preserve previous registers for short regset write") Signed-off-by: Maciej W. Rozycki macro@mips.com --- arch/mips/kernel/ptrace.c | 1 + 1 file changed, 1 insertion(+)
linux-mips-nt-prfpreg-build-bug.diff Index: linux-sfr-test/arch/mips/kernel/ptrace.c =================================================================== --- linux-sfr-test.orig/arch/mips/kernel/ptrace.c 2017-11-28 23:33:33.395023000 +0000 +++ linux-sfr-test/arch/mips/kernel/ptrace.c 2017-11-28 23:52:34.944549000 +0000 @@ -438,6 +438,7 @@ static int fpr_get_msa(struct task_struc 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,