This is a note to let you know that I've just added the patch titled

MIPS: Also verify sizeof `elf_fpreg_t' with PTRACE_SETREGSET

to the 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: mips-also-verify-sizeof-elf_fpreg_t-with-ptrace_setregset.patch and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

From 006501e039eec411842bb3150c41358867d320c2 Mon Sep 17 00:00:00 2001

From: "Maciej W. Rozycki" macro@mips.com Date: Mon, 11 Dec 2017 22:55:40 +0000 Subject: MIPS: Also verify sizeof `elf_fpreg_t' with PTRACE_SETREGSET

From: Maciej W. Rozycki macro@mips.com

commit 006501e039eec411842bb3150c41358867d320c2 upstream.

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 Patchwork: https://patchwork.linux-mips.org/patch/17929/ Signed-off-by: Ralf Baechle ralf@linux-mips.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org

--- arch/mips/kernel/ptrace.c | 1 + 1 file changed, 1 insertion(+)

--- a/arch/mips/kernel/ptrace.c +++ b/arch/mips/kernel/ptrace.c @@ -467,6 +467,7 @@ 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,

Patches currently in stable-queue which might be from macro@mips.com are

queue-4.9/mips-consistently-handle-buffer-counter-with-ptrace_setregset.patch queue-4.9/mips-disallow-outsized-ptrace_setregset-nt_prfpreg-regset-accesses.patch queue-4.9/mips-guard-against-any-partial-write-attempt-with-ptrace_setregset.patch queue-4.9/mips-also-verify-sizeof-elf_fpreg_t-with-ptrace_setregset.patch queue-4.9/mips-factor-out-nt_prfpreg-regset-access-helpers.patch queue-4.9/mips-validate-pr_set_fp_mode-prctl-2-requests-against-the-abi-of-the-task.patch queue-4.9/mips-fix-an-fcsr-access-api-regression-with-nt_prfpreg-and-msa.patch