linux-kernel - [PATCH 3.10 121/268] apparmor: do not expose kernel stack

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Date:   Mon, 19 Jun 2017 20:30:20 +0200
From:   Willy Tarreau <w@....eu>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        linux@...ck-us.net
Cc:     Heinrich Schuchardt <xypron.glpk@....de>,
        John Johansen <john.johansen@...onical.com>,
        Jiri Slaby <jslaby@...e.cz>, Willy Tarreau <w@....eu>
Subject: [PATCH 3.10 121/268] apparmor: do not expose kernel stack

From: Heinrich Schuchardt <xypron.glpk@....de>

commit f4ee2def2d70692ccff0d55353df4ee594fd0017 upstream.

Do not copy uninitalized fields th.td_hilen, th.td_data.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@....de>
Signed-off-by: John Johansen <john.johansen@...onical.com>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
Signed-off-by: Willy Tarreau <w@....eu>
---
 security/apparmor/match.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/security/apparmor/match.c b/security/apparmor/match.c
index 10d824b..704b0eb 100644
--- a/security/apparmor/match.c
+++ b/security/apparmor/match.c
@@ -61,7 +61,9 @@ static struct table_header *unpack_table(char *blob, size_t bsize)
 
 	table = kvmalloc(tsize);
 	if (table) {
-		*table = th;
+		table->td_id = th.td_id;
+		table->td_flags = th.td_flags;
+		table->td_lolen = th.td_lolen;
 		if (th.td_flags == YYTD_DATA8)
 			UNPACK_ARRAY(table->td_data, blob, th.td_lolen,
 				     u8, byte_to_byte);
-- 
2.8.0.rc2.1.gbe9624a