This is a note to let you know that I've just added the patch titled MIPS: Disallow outsized PTRACE_SETREGSET NT_PRFPREG regset accesses to the 3.18-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: mips-disallow-outsized-ptrace_setregset-nt_prfpreg-regset-accesses.patch and it can be found in the queue-3.18 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From c8c5a3a24d395b14447a9a89d61586a913840a3b Mon Sep 17 00:00:00 2001 From: "Maciej W. Rozycki" <macro@xxxxxxxx> Date: Mon, 11 Dec 2017 22:56:54 +0000 Subject: MIPS: Disallow outsized PTRACE_SETREGSET NT_PRFPREG regset accesses From: Maciej W. Rozycki <macro@xxxxxxxx> commit c8c5a3a24d395b14447a9a89d61586a913840a3b upstream. Complement commit c23b3d1a5311 ("MIPS: ptrace: Change GP regset to use correct core dump register layout") and also reject outsized PTRACE_SETREGSET requests to the NT_PRFPREG regset, like with the NT_PRSTATUS regset. Signed-off-by: Maciej W. Rozycki <macro@xxxxxxxx> Fixes: c23b3d1a5311 ("MIPS: ptrace: Change GP regset to use correct core dump register layout") Cc: James Hogan <james.hogan@xxxxxxxx> Cc: Paul Burton <Paul.Burton@xxxxxxxx> Cc: Alex Smith <alex@xxxxxxxxxxxxxxxx> Cc: Dave Martin <Dave.Martin@xxxxxxx> Cc: linux-mips@xxxxxxxxxxxxxx Cc: linux-kernel@xxxxxxxxxxxxxxx Patchwork: https://patchwork.linux-mips.org/patch/17930/ Signed-off-by: Ralf Baechle <ralf@xxxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- arch/mips/kernel/ptrace.c | 3 +++ 1 file changed, 3 insertions(+) --- a/arch/mips/kernel/ptrace.c +++ b/arch/mips/kernel/ptrace.c @@ -530,6 +530,9 @@ static int fpr_set(struct task_struct *t BUG_ON(count % sizeof(elf_fpreg_t)); + if (pos + count > sizeof(elf_fpregset_t)) + return -EIO; + if (sizeof(target->thread.fpu.fpr[0]) == sizeof(elf_fpreg_t)) err = fpr_set_fpa(target, &pos, &count, &kbuf, &ubuf); else Patches currently in stable-queue which might be from macro@xxxxxxxx are queue-3.18/mips-consistently-handle-buffer-counter-with-ptrace_setregset.patch queue-3.18/mips-disallow-outsized-ptrace_setregset-nt_prfpreg-regset-accesses.patch queue-3.18/mips-guard-against-any-partial-write-attempt-with-ptrace_setregset.patch queue-3.18/mips-also-verify-sizeof-elf_fpreg_t-with-ptrace_setregset.patch queue-3.18/mips-factor-out-nt_prfpreg-regset-access-helpers.patch queue-3.18/mips-fix-an-fcsr-access-api-regression-with-nt_prfpreg-and-msa.patch