This is a note to let you know that I've just added the patch titled
metag/ptrace: Provide default TXSTATUS for short NT_PRSTATUS
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:
metag-ptrace-provide-default-txstatus-for-short-nt_prstatus.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 5fe81fe98123ce41265c65e95d34418d30d005d1 Mon Sep 17 00:00:00 2001
From: Dave Martin <Dave.Martin@xxxxxxx>
Date: Mon, 27 Mar 2017 15:10:56 +0100
Subject: metag/ptrace: Provide default TXSTATUS for short NT_PRSTATUS
From: Dave Martin <Dave.Martin@xxxxxxx>
commit 5fe81fe98123ce41265c65e95d34418d30d005d1 upstream.
Ensure that if userspace supplies insufficient data to PTRACE_SETREGSET
to fill TXSTATUS, a well-defined default value is used, based on the
task's current value.
Suggested-by: James Hogan <james.hogan@xxxxxxxxxx>
Signed-off-by: Dave Martin <Dave.Martin@xxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/metag/kernel/ptrace.c | 15 ++++++++++++---
1 file changed, 12 insertions(+), 3 deletions(-)
--- a/arch/metag/kernel/ptrace.c
+++ b/arch/metag/kernel/ptrace.c
@@ -24,6 +24,16 @@
* user_regset definitions.
*/
+static unsigned long user_txstatus(const struct pt_regs *regs)
+{
+ unsigned long data = (unsigned long)regs->ctx.Flags;
+
+ if (regs->ctx.SaveMask & TBICTX_CBUF_BIT)
+ data |= USER_GP_REGS_STATUS_CATCH_BIT;
+
+ return data;
+}
+
int metag_gp_regs_copyout(const struct pt_regs *regs,
unsigned int pos, unsigned int count,
void *kbuf, void __user *ubuf)
@@ -62,9 +72,7 @@ int metag_gp_regs_copyout(const struct p
if (ret)
goto out;
/* TXSTATUS */
- data = (unsigned long)regs->ctx.Flags;
- if (regs->ctx.SaveMask & TBICTX_CBUF_BIT)
- data |= USER_GP_REGS_STATUS_CATCH_BIT;
+ data = user_txstatus(regs);
ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
&data, 4*25, 4*26);
if (ret)
@@ -119,6 +127,7 @@ int metag_gp_regs_copyin(struct pt_regs
if (ret)
goto out;
/* TXSTATUS */
+ data = user_txstatus(regs);
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
&data, 4*25, 4*26);
if (ret)
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