linux-kernel - [PATCH 3/5] ->getprocattr(): attribute name is const char *, TYVM...

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Message-ID: <Yv2q6/bVtQgB07k4@ZenIV>
Date:   Thu, 18 Aug 2022 03:58:51 +0100
From:   Al Viro <viro@...iv.linux.org.uk>
To:     linux-fsdevel@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH 3/5] ->getprocattr(): attribute name is const char *, TYVM...

cast of ->d_name.name to char * is completely wrong - nothing is
allowed to modify its contents.

Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
---
 fs/proc/base.c                | 2 +-
 include/linux/lsm_hook_defs.h | 2 +-
 include/linux/security.h      | 4 ++--
 security/apparmor/lsm.c       | 2 +-
 security/security.c           | 4 ++--
 security/selinux/hooks.c      | 2 +-
 security/smack/smack_lsm.c    | 2 +-
 7 files changed, 9 insertions(+), 9 deletions(-)

diff --git a/fs/proc/base.c b/fs/proc/base.c
index 93f7e3d971e4..e347b8ce140c 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -2728,7 +2728,7 @@ static ssize_t proc_pid_attr_read(struct file * file, char __user * buf,
 		return -ESRCH;
 
 	length = security_getprocattr(task, PROC_I(inode)->op.lsm,
-				      (char*)file->f_path.dentry->d_name.name,
+				      file->f_path.dentry->d_name.name,
 				      &p);
 	put_task_struct(task);
 	if (length > 0)
diff --git a/include/linux/lsm_hook_defs.h b/include/linux/lsm_hook_defs.h
index 806448173033..03360d27bedf 100644
--- a/include/linux/lsm_hook_defs.h
+++ b/include/linux/lsm_hook_defs.h
@@ -253,7 +253,7 @@ LSM_HOOK(int, 0, sem_semop, struct kern_ipc_perm *perm, struct sembuf *sops,
 LSM_HOOK(int, 0, netlink_send, struct sock *sk, struct sk_buff *skb)
 LSM_HOOK(void, LSM_RET_VOID, d_instantiate, struct dentry *dentry,
 	 struct inode *inode)
-LSM_HOOK(int, -EINVAL, getprocattr, struct task_struct *p, char *name,
+LSM_HOOK(int, -EINVAL, getprocattr, struct task_struct *p, const char *name,
 	 char **value)
 LSM_HOOK(int, -EINVAL, setprocattr, const char *name, void *value, size_t size)
 LSM_HOOK(int, 0, ismaclabel, const char *name)
diff --git a/include/linux/security.h b/include/linux/security.h
index 1bc362cb413f..93488c01d9bd 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -461,7 +461,7 @@ int security_sem_semctl(struct kern_ipc_perm *sma, int cmd);
 int security_sem_semop(struct kern_ipc_perm *sma, struct sembuf *sops,
 			unsigned nsops, int alter);
 void security_d_instantiate(struct dentry *dentry, struct inode *inode);
-int security_getprocattr(struct task_struct *p, const char *lsm, char *name,
+int security_getprocattr(struct task_struct *p, const char *lsm, const char *name,
 			 char **value);
 int security_setprocattr(const char *lsm, const char *name, void *value,
 			 size_t size);
@@ -1301,7 +1301,7 @@ static inline void security_d_instantiate(struct dentry *dentry,
 { }
 
 static inline int security_getprocattr(struct task_struct *p, const char *lsm,
-				       char *name, char **value)
+				       const char *name, char **value)
 {
 	return -EINVAL;
 }
diff --git a/security/apparmor/lsm.c b/security/apparmor/lsm.c
index e29cade7b662..f56070270c69 100644
--- a/security/apparmor/lsm.c
+++ b/security/apparmor/lsm.c
@@ -614,7 +614,7 @@ static int apparmor_sb_pivotroot(const struct path *old_path,
 	return error;
 }
 
-static int apparmor_getprocattr(struct task_struct *task, char *name,
+static int apparmor_getprocattr(struct task_struct *task, const char *name,
 				char **value)
 {
 	int error = -ENOENT;
diff --git a/security/security.c b/security/security.c
index 14d30fec8a00..d8227531e2fd 100644
--- a/security/security.c
+++ b/security/security.c
@@ -2057,8 +2057,8 @@ void security_d_instantiate(struct dentry *dentry, struct inode *inode)
 }
 EXPORT_SYMBOL(security_d_instantiate);
 
-int security_getprocattr(struct task_struct *p, const char *lsm, char *name,
-				char **value)
+int security_getprocattr(struct task_struct *p, const char *lsm,
+			 const char *name, char **value)
 {
 	struct security_hook_list *hp;
 
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 79573504783b..c8168d19fb96 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -6327,7 +6327,7 @@ static void selinux_d_instantiate(struct dentry *dentry, struct inode *inode)
 }
 
 static int selinux_getprocattr(struct task_struct *p,
-			       char *name, char **value)
+			       const char *name, char **value)
 {
 	const struct task_security_struct *__tsec;
 	u32 sid;
diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index 001831458fa2..434b348d8fcd 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -3479,7 +3479,7 @@ static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode)
  *
  * Returns the length of the smack label or an error code
  */
-static int smack_getprocattr(struct task_struct *p, char *name, char **value)
+static int smack_getprocattr(struct task_struct *p, const char *name, char **value)
 {
 	struct smack_known *skp = smk_of_task_struct_obj(p);
 	char *cp;
-- 
2.30.2