linux-kernel - [PATCH] lsm: constify 'sb' parameter in security

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Message-ID: <ZOWq2d5c7MpLl5A4@gmail.com>
Date:   Wed, 23 Aug 2023 11:44:41 +0500
From:   Khadija Kamran <kamrankhadijadj@...il.com>
To:     linux-kernel@...r.kernel.org, Paul Moore <paul@...l-moore.com>,
        James Morris <jmorris@...ei.org>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        linux-security-module@...r.kernel.org,
        Stephen Smalley <stephen.smalley.work@...il.com>,
        Eric Paris <eparis@...isplace.org>, selinux@...r.kernel.org,
        ztarkhani@...rosoft.com, alison.schofield@...el.com
Subject: [PATCH] lsm: constify 'sb' parameter in security_quotactl()

SELinux registers the implementation for the "quotactl" hook. Looking at
the function implementation we observe that the parameter "sb" is not
changing.

Mark the "sb" parameter of LSM hook security_quotactl() as "const" since
it will not be changing in the LSM hook.

Signed-off-by: Khadija Kamran <kamrankhadijadj@...il.com>
---
 include/linux/lsm_hook_defs.h | 2 +-
 include/linux/security.h      | 4 ++--
 security/security.c           | 2 +-
 security/selinux/hooks.c      | 4 ++--
 4 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/include/linux/lsm_hook_defs.h b/include/linux/lsm_hook_defs.h
index 6bb55e61e8e8..b63672ef6f11 100644
--- a/include/linux/lsm_hook_defs.h
+++ b/include/linux/lsm_hook_defs.h
@@ -43,7 +43,7 @@ LSM_HOOK(int, 0, capset, struct cred *new, const struct cred *old,
 	 const kernel_cap_t *permitted)
 LSM_HOOK(int, 0, capable, const struct cred *cred, struct user_namespace *ns,
 	 int cap, unsigned int opts)
-LSM_HOOK(int, 0, quotactl, int cmds, int type, int id, struct super_block *sb)
+LSM_HOOK(int, 0, quotactl, int cmds, int type, int id, const struct super_block *sb)
 LSM_HOOK(int, 0, quota_on, struct dentry *dentry)
 LSM_HOOK(int, 0, syslog, int type)
 LSM_HOOK(int, 0, settime, const struct timespec64 *ts,
diff --git a/include/linux/security.h b/include/linux/security.h
index e2734e9e44d5..b4d1e160bd76 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -283,7 +283,7 @@ int security_capable(const struct cred *cred,
 		       struct user_namespace *ns,
 		       int cap,
 		       unsigned int opts);
-int security_quotactl(int cmds, int type, int id, struct super_block *sb);
+int security_quotactl(int cmds, int type, int id, const struct super_block *sb);
 int security_quota_on(struct dentry *dentry);
 int security_syslog(int type);
 int security_settime64(const struct timespec64 *ts, const struct timezone *tz);
@@ -579,7 +579,7 @@ static inline int security_capable(const struct cred *cred,
 }
 
 static inline int security_quotactl(int cmds, int type, int id,
-				     struct super_block *sb)
+				     const struct super_block *sb)
 {
 	return 0;
 }
diff --git a/security/security.c b/security/security.c
index d5ff7ff45b77..1844b8ab3317 100644
--- a/security/security.c
+++ b/security/security.c
@@ -956,7 +956,7 @@ int security_capable(const struct cred *cred,
  *
  * Return: Returns 0 if permission is granted.
  */
-int security_quotactl(int cmds, int type, int id, struct super_block *sb)
+int security_quotactl(int cmds, int type, int id, const struct super_block *sb)
 {
 	return call_int_hook(quotactl, 0, cmds, type, id, sb);
 }
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 79b4890e9936..8d4611ac5ec3 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -1886,7 +1886,7 @@ static inline int may_rename(struct inode *old_dir,
 
 /* Check whether a task can perform a filesystem operation. */
 static int superblock_has_perm(const struct cred *cred,
-			       struct super_block *sb,
+			       const struct super_block *sb,
 			       u32 perms,
 			       struct common_audit_data *ad)
 {
@@ -2088,7 +2088,7 @@ static int selinux_capable(const struct cred *cred, struct user_namespace *ns,
 	return cred_has_capability(cred, cap, opts, ns == &init_user_ns);
 }
 
-static int selinux_quotactl(int cmds, int type, int id, struct super_block *sb)
+static int selinux_quotactl(int cmds, int type, int id, const struct super_block *sb)
 {
 	const struct cred *cred = current_cred();
 	int rc = 0;
-- 
2.34.1