This is a note to let you know that I've just added the patch titled
mips/ptrace: Preserve previous registers for short regset write
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-ptrace-preserve-previous-registers-for-short-regset-write.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 d614fd58a2834cfe4efa472c33c8f3ce2338b09b Mon Sep 17 00:00:00 2001
From: Dave Martin <Dave.Martin@xxxxxxx>
Date: Mon, 27 Mar 2017 15:10:58 +0100
Subject: mips/ptrace: Preserve previous registers for short regset write
From: Dave Martin <Dave.Martin@xxxxxxx>
commit d614fd58a2834cfe4efa472c33c8f3ce2338b09b upstream.
Ensure that if userspace supplies insufficient data to PTRACE_SETREGSET
to fill all the registers, the thread's old registers are preserved.
Signed-off-by: Dave Martin <Dave.Martin@xxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/mips/kernel/ptrace.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/arch/mips/kernel/ptrace.c
+++ b/arch/mips/kernel/ptrace.c
@@ -485,7 +485,8 @@ static int fpr_set(struct task_struct *t
&target->thread.fpu,
0, sizeof(elf_fpregset_t));
- for (i = 0; i < NUM_FPU_REGS; i++) {
+ BUILD_BUG_ON(sizeof(fpr_val) != sizeof(elf_fpreg_t));
+ for (i = 0; i < NUM_FPU_REGS && count >= sizeof(elf_fpreg_t); i++) {
err = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
&fpr_val, i * sizeof(elf_fpreg_t),
(i + 1) * sizeof(elf_fpreg_t));
Patches currently in stable-queue which might be from Dave.Martin@xxxxxxx are
queue-4.9/metag-ptrace-reject-partial-nt_metag_rpipe-writes.patch
queue-4.9/metag-ptrace-preserve-previous-registers-for-short-regset-write.patch
queue-4.9/metag-ptrace-provide-default-txstatus-for-short-nt_prstatus.patch
queue-4.9/c6x-ptrace-remove-useless-ptrace_setregset-implementation.patch
queue-4.9/mips-ptrace-preserve-previous-registers-for-short-regset-write.patch
queue-4.9/h8300-ptrace-fix-incorrect-register-transfer-count.patch
queue-4.9/sparc-ptrace-preserve-previous-registers-for-short-regset-write.patch