linux-kernel - [PATCH 4/9] selinux: enclose macro arguments in parenthesis

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Date:   Tue, 25 Jan 2022 15:14:14 +0100
From:   Christian Göttsche <cgzones@...glemail.com>
To:     selinux@...r.kernel.org
Cc:     Paul Moore <paul@...l-moore.com>,
        Stephen Smalley <stephen.smalley.work@...il.com>,
        Eric Paris <eparis@...isplace.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Xiong Zhenwu <xiong.zhenwu@....com.cn>,
        Tyler Hicks <tyhicks@...ux.microsoft.com>,
        Ondrej Mosnacek <omosnace@...hat.com>,
        Xiu Jianfeng <xiujianfeng@...wei.com>,
        Jeff Vander Stoep <jeffv@...gle.com>,
        linux-kernel@...r.kernel.org, llvm@...ts.linux.dev
Subject: [PATCH 4/9] selinux: enclose macro arguments in parenthesis

Enclose the macro arguments in parenthesis to avoid potential evaluation
order issues.

Note the xperm and ebitmap macros are still not side-effect safe due to
double evaluation.

Reported by clang-tidy [bugprone-macro-parentheses]

Signed-off-by: Christian Göttsche <cgzones@...glemail.com>
---
 security/selinux/include/security.h | 4 ++--
 security/selinux/ss/ebitmap.h       | 6 +++---
 security/selinux/ss/sidtab.c        | 4 ++--
 3 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/security/selinux/include/security.h b/security/selinux/include/security.h
index 6482e0efb368..d91a5672de99 100644
--- a/security/selinux/include/security.h
+++ b/security/selinux/include/security.h
@@ -254,8 +254,8 @@ struct av_decision {
 #define XPERMS_AUDITALLOW 2
 #define XPERMS_DONTAUDIT 4
 
-#define security_xperm_set(perms, x) (perms[x >> 5] |= 1 << (x & 0x1f))
-#define security_xperm_test(perms, x) (1 & (perms[x >> 5] >> (x & 0x1f)))
+#define security_xperm_set(perms, x) ((perms)[(x) >> 5] |= 1 << ((x) & 0x1f))
+#define security_xperm_test(perms, x) (1 & ((perms)[(x) >> 5] >> ((x) & 0x1f)))
 struct extended_perms_data {
 	u32 p[8];
 };
diff --git a/security/selinux/ss/ebitmap.h b/security/selinux/ss/ebitmap.h
index 9eb2d0af2805..58eb822f11ee 100644
--- a/security/selinux/ss/ebitmap.h
+++ b/security/selinux/ss/ebitmap.h
@@ -118,9 +118,9 @@ static inline void ebitmap_node_clr_bit(struct ebitmap_node *n,
 }
 
 #define ebitmap_for_each_positive_bit(e, n, bit)	\
-	for (bit = ebitmap_start_positive(e, &n);	\
-	     bit < ebitmap_length(e);			\
-	     bit = ebitmap_next_positive(e, &n, bit))	\
+	for ((bit) = ebitmap_start_positive(e, &(n));	\
+	     (bit) < ebitmap_length(e);			\
+	     (bit) = ebitmap_next_positive(e, &(n), bit))	\
 
 int ebitmap_cmp(struct ebitmap *e1, struct ebitmap *e2);
 int ebitmap_cpy(struct ebitmap *dst, struct ebitmap *src);
diff --git a/security/selinux/ss/sidtab.c b/security/selinux/ss/sidtab.c
index 293ec048af08..a54b8652bfb5 100644
--- a/security/selinux/ss/sidtab.c
+++ b/security/selinux/ss/sidtab.c
@@ -27,8 +27,8 @@ struct sidtab_str_cache {
 	char str[];
 };
 
-#define index_to_sid(index) (index + SECINITSID_NUM + 1)
-#define sid_to_index(sid) (sid - (SECINITSID_NUM + 1))
+#define index_to_sid(index) ((index) + SECINITSID_NUM + 1)
+#define sid_to_index(sid) ((sid) - (SECINITSID_NUM + 1))
 
 int sidtab_init(struct sidtab *s)
 {
-- 
2.34.1