linux-kernel - [PATCH 3.12 105/142] sparc/ptrace: Preserve previous registers for short regset write

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Message-Id: <bc586353a4d9e3987e4b53d544cd76e4fdeacedb.1491838390.git.jslaby@suse.cz>
Date:   Mon, 10 Apr 2017 17:33:06 +0200
From:   Jiri Slaby <jslaby@...e.cz>
To:     stable@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Dave Martin <Dave.Martin@....com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 105/142] sparc/ptrace: Preserve previous registers for short regset write

From: Dave Martin <Dave.Martin@....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@....com>
Acked-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Jiri Slaby <jslaby@...e.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