4 files changed, 9 insertions, 103 deletions

diff --git a/security/tomoyo/file.c b/security/tomoyo/file.c
index 2d10f98fc551..482f0e7ed997 100644
--- a/security/tomoyo/file.c
+++ b/security/tomoyo/file.c
@@ -1118,27 +1118,6 @@ static int tomoyo_check_single_path_permission2(struct tomoyo_domain_info *
 }
 
 /**
- * tomoyo_check_file_perm - Check permission for sysctl()'s "read" and "write".
- *
- * @domain:    Pointer to "struct tomoyo_domain_info".
- * @filename:  Filename to check.
- * @perm:      Mode ("read" or "write" or "read/write").
- * Returns 0 on success, negative value otherwise.
- */
-int tomoyo_check_file_perm(struct tomoyo_domain_info *domain,
-			   const char *filename, const u8 perm)
-{
-	struct tomoyo_path_info name;
-	const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE);
-
-	if (!mode)
-		return 0;
-	name.name = filename;
-	tomoyo_fill_path_info(&name);
-	return tomoyo_check_file_perm2(domain, &name, perm, "sysctl", mode);
-}
-
-/**
  * tomoyo_check_exec_perm - Check permission for "execute".
  *
  * @domain:   Pointer to "struct tomoyo_domain_info".
diff --git a/security/tomoyo/realpath.c b/security/tomoyo/realpath.c
index 917f564cdab1..18369d497eb8 100644
--- a/security/tomoyo/realpath.c
+++ b/security/tomoyo/realpath.c
@@ -110,6 +110,15 @@ int tomoyo_realpath_from_path2(struct path *path, char *newname,
 		spin_unlock(&dcache_lock);
 		path_put(&root);
 		path_put(&ns_root);
+		/* Prepend "/proc" prefix if using internal proc vfs mount. */
+		if (!IS_ERR(sp) && (path->mnt->mnt_parent == path->mnt) &&
+		    (strcmp(path->mnt->mnt_sb->s_type->name, "proc") == 0)) {
+			sp -= 5;
+			if (sp >= newname)
+				memcpy(sp, "/proc", 5);
+			else
+				sp = ERR_PTR(-ENOMEM);
+		}
 	}
 	if (IS_ERR(sp))
 		error = PTR_ERR(sp);
diff --git a/security/tomoyo/tomoyo.c b/security/tomoyo/tomoyo.c
index 3fb5f6ea4fc9..ad9555fc3765 100644
--- a/security/tomoyo/tomoyo.c
+++ b/security/tomoyo/tomoyo.c
@@ -85,83 +85,6 @@ static int tomoyo_bprm_check_security(struct linux_binprm *bprm)
 	return tomoyo_check_open_permission(domain, &bprm->file->f_path, 1);
 }
 
-#ifdef CONFIG_SYSCTL
-
-static int tomoyo_prepend(char **buffer, int *buflen, const char *str)
-{
-	int namelen = strlen(str);
-
-	if (*buflen < namelen)
-		return -ENOMEM;
-	*buflen -= namelen;
-	*buffer -= namelen;
-	memcpy(*buffer, str, namelen);
-	return 0;
-}
-
-/**
- * tomoyo_sysctl_path - return the realpath of a ctl_table.
- * @table: pointer to "struct ctl_table".
- *
- * Returns realpath(3) of the @table on success.
- * Returns NULL on failure.
- *
- * This function uses tomoyo_alloc(), so the caller must call tomoyo_free()
- * if this function didn't return NULL.
- */
-static char *tomoyo_sysctl_path(struct ctl_table *table)
-{
-	int buflen = TOMOYO_MAX_PATHNAME_LEN;
-	char *buf = tomoyo_alloc(buflen);
-	char *end = buf + buflen;
-	int error = -ENOMEM;
-
-	if (!buf)
-		return NULL;
-
-	*--end = '\0';
-	buflen--;
-	while (table) {
-		char num[32];
-		const char *sp = table->procname;
-
-		if (!sp) {
-			memset(num, 0, sizeof(num));
-			snprintf(num, sizeof(num) - 1, "=%d=", table->ctl_name);
-			sp = num;
-		}
-		if (tomoyo_prepend(&end, &buflen, sp) ||
-		    tomoyo_prepend(&end, &buflen, "/"))
-			goto out;
-		table = table->parent;
-	}
-	if (tomoyo_prepend(&end, &buflen, "/proc/sys"))
-		goto out;
-	error = tomoyo_encode(buf, end - buf, end);
- out:
-	if (!error)
-		return buf;
-	tomoyo_free(buf);
-	return NULL;
-}
-
-static int tomoyo_sysctl(struct ctl_table *table, int op)
-{
-	int error;
-	char *name;
-
-	op &= MAY_READ | MAY_WRITE;
-	if (!op)
-		return 0;
-	name = tomoyo_sysctl_path(table);
-	if (!name)
-		return -ENOMEM;
-	error = tomoyo_check_file_perm(tomoyo_domain(), name, op);
-	tomoyo_free(name);
-	return error;
-}
-#endif
-
 static int tomoyo_path_truncate(struct path *path, loff_t length,
 				unsigned int time_attrs)
 {
@@ -336,9 +259,6 @@ static struct security_operations tomoyo_security_ops = {
 	.cred_transfer	     = tomoyo_cred_transfer,
 	.bprm_set_creds      = tomoyo_bprm_set_creds,
 	.bprm_check_security = tomoyo_bprm_check_security,
-#ifdef CONFIG_SYSCTL
-	.sysctl              = tomoyo_sysctl,
-#endif
 	.file_fcntl          = tomoyo_file_fcntl,
 	.dentry_open         = tomoyo_dentry_open,
 	.path_truncate       = tomoyo_path_truncate,
diff --git a/security/tomoyo/tomoyo.h b/security/tomoyo/tomoyo.h
index fac02655ea4b..bf3986addc1a 100644
--- a/security/tomoyo/tomoyo.h
+++ b/security/tomoyo/tomoyo.h
@@ -18,8 +18,6 @@ struct inode;
 struct linux_binprm;
 struct pt_regs;
 
-int tomoyo_check_file_perm(struct tomoyo_domain_info *domain,
-			   const char *filename, const u8 perm);
 int tomoyo_check_exec_perm(struct tomoyo_domain_info *domain,
 			   const struct tomoyo_path_info *filename);
 int tomoyo_check_open_permission(struct tomoyo_domain_info *domain,