linux-kernel - [PATCH] selinux: conditional expression type validation was off-by-one

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Message-Id: <200808061546.m76Fkwq1005199@ruuvi.it.helsinki.fi>
Date:	Wed, 6 Aug 2008 18:24:51 +0300
From:	Vesa-Matti Kari <vmkari@...helsinki.fi>
To:	sds@...ho.nsa.gov, jmorris@...ei.org, eparis@...isplace.org
Cc:	linux-kernel@...r.kernel.org, selinux@...ho.nsa.gov
Subject: [PATCH] selinux: conditional expression type validation was off-by-one

expr_isvalid() in conditional.c was off-by-one and allowed
invalid expression type COND_LAST. However, it is this header file
that needs to be fixed. That way the if-statement's disjunction's
second component reads more naturally, "if expr type is greater than
the last allowed value" ( rather than using ">=" in conditional.c):

  if (expr->expr_type <= 0 || expr->expr_type > COND_LAST)

Signed-off-by: Vesa-Matti Kari <vmkari@...helsinki.fi>
---
 security/selinux/ss/conditional.h |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/security/selinux/ss/conditional.h b/security/selinux/ss/conditional.h
index 65b9f83..53ddb01 100644
--- a/security/selinux/ss/conditional.h
+++ b/security/selinux/ss/conditional.h
@@ -28,7 +28,7 @@ struct cond_expr {
 #define COND_XOR	5 /* bool ^ bool */
 #define COND_EQ		6 /* bool == bool */
 #define COND_NEQ	7 /* bool != bool */
-#define COND_LAST	8
+#define COND_LAST	COND_NEQ
 	__u32 expr_type;
 	__u32 bool;
 	struct cond_expr *next;
-- 
1.5.4.1

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