linux-kernel - [PATCH] infoleak fix2 in signal

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Message-Id: <1462308166-6126-1-git-send-email-kjlu@gatech.edu>
Date:	Tue,  3 May 2016 16:42:46 -0400
From:	Kangjie Lu <kangjielu@...il.com>
To:	akpm@...ux-foundation.org
Cc:	oleg@...hat.com, peterz@...radead.org, amanieu@...il.com,
	linux-kernel@...r.kernel.org, taesoo@...ech.edu, insu@...ech.edu,
	Kangjie Lu <kjlu@...ech.edu>
Subject: [PATCH] infoleak fix2 in signal

The stack object “info” has a total size of 128 bytes; however,
only 32 bytes are initialized. The remaining uninitialized bytes
are sent to userland via send_signal.

Signed-off-by: Kangjie Lu <kjlu@...ech.edu>
---
 kernel/signal.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/signal.c b/kernel/signal.c
index f40f0b3..26fdb74 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -1689,6 +1689,7 @@ static void do_notify_parent_cldstop(struct task_struct *tsk,
 		parent = tsk->real_parent;
 	}
 
+	memset(&info, 0, sizeof(info));
 	info.si_signo = SIGCHLD;
 	info.si_errno = 0;
 	/*
-- 
1.9.1