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Subject[PATCH 3.12 105/142] sparc/ptrace: Preserve previous registers for short regset write
Date
From: Dave Martin <Dave.Martin@arm.com>

3.12-stable review patch. If anyone has any objections, please let me know.

===============

commit d3805c546b275c8cc7d40f759d029ae92c7175f2 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@arm.com>
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
arch/sparc/kernel/ptrace_64.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/sparc/kernel/ptrace_64.c b/arch/sparc/kernel/ptrace_64.c
index 773c1f2983ce..89297b7c6261 100644
--- a/arch/sparc/kernel/ptrace_64.c
+++ b/arch/sparc/kernel/ptrace_64.c
@@ -310,7 +310,7 @@ static int genregs64_set(struct task_struct *target,
}

if (!ret) {
- unsigned long y;
+ unsigned long y = regs->y;

ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
&y,
--
2.12.2
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