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 4.9-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-4.9 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
@@ -570,6 +570,9 @@ static int fpr_set(struct task_struct *t
BUG_ON(count % sizeof(elf_fpreg_t));
+ if (pos + count > sizeof(elf_fpregset_t))
+ return -EIO;
+
init_fp_ctx(target);
if (sizeof(target->thread.fpu.fpr[0]) == sizeof(elf_fpreg_t))
Patches currently in stable-queue which might be from macro@xxxxxxxx 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