security,bpf: constify struct path in bpf_token_create() LSM hook

There is no reason why struct path pointer shouldn't be const-qualified
when being passed into bpf_token_create() LSM hook. Add that const.

Acked-by: Paul Moore <paul@paul-moore.com> (LSM/SELinux)
Suggested-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>

include/linux/lsm_hook_defs.h

@@ -431,7 +431,7 @@ LSM_HOOK(int, 0, bpf_prog_load, struct bpf_prog *prog, union bpf_attr *attr,
 	 struct bpf_token *token)
 LSM_HOOK(void, LSM_RET_VOID, bpf_prog_free, struct bpf_prog *prog)
 LSM_HOOK(int, 0, bpf_token_create, struct bpf_token *token, union bpf_attr *attr,
-	 struct path *path)
+	 const struct path *path)
 LSM_HOOK(void, LSM_RET_VOID, bpf_token_free, struct bpf_token *token)
 LSM_HOOK(int, 0, bpf_token_cmd, const struct bpf_token *token, enum bpf_cmd cmd)
 LSM_HOOK(int, 0, bpf_token_capable, const struct bpf_token *token, int cap)

include/linux/security.h

@@ -2137,7 +2137,7 @@ extern int security_bpf_prog_load(struct bpf_prog *prog, union bpf_attr *attr,
 				  struct bpf_token *token);
 extern void security_bpf_prog_free(struct bpf_prog *prog);
 extern int security_bpf_token_create(struct bpf_token *token, union bpf_attr *attr,
-				     struct path *path);
+				     const struct path *path);
 extern void security_bpf_token_free(struct bpf_token *token);
 extern int security_bpf_token_cmd(const struct bpf_token *token, enum bpf_cmd cmd);
 extern int security_bpf_token_capable(const struct bpf_token *token, int cap);
@@ -2177,7 +2177,7 @@ static inline void security_bpf_prog_free(struct bpf_prog *prog)
 { }
 
 static inline int security_bpf_token_create(struct bpf_token *token, union bpf_attr *attr,
-				     struct path *path)
+					    const struct path *path)
 {
 	return 0;
 }

security/security.c

@@ -5510,7 +5510,7 @@ int security_bpf_prog_load(struct bpf_prog *prog, union bpf_attr *attr,
  * Return: Returns 0 on success, error on failure.
  */
 int security_bpf_token_create(struct bpf_token *token, union bpf_attr *attr,
-			      struct path *path)
+			      const struct path *path)
 {
 	return call_int_hook(bpf_token_create, token, attr, path);
 }

security/selinux/hooks.c

@@ -6965,7 +6965,7 @@ static void selinux_bpf_prog_free(struct bpf_prog *prog)
 }
 
 static int selinux_bpf_token_create(struct bpf_token *token, union bpf_attr *attr,
-				    struct path *path)
+				    const struct path *path)
 {
 	struct bpf_security_struct *bpfsec;