security/tomoyo: Remove now unnecessary handling of security_sysctl.

Now that sys_sysctl is an emulation on top of proc sys all sysctl
operations look like normal filesystem operations and we don't need
to use the special sysctl hook to authenticate them.

Acked-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>

1 files changed, 0 insertions, 72 deletions

diff --git a/security/tomoyo/tomoyo.c b/security/tomoyo/tomoyo.c
index 3f93bb91768b..8a00ade85166 100644
--- a/security/tomoyo/tomoyo.c
+++ b/security/tomoyo/tomoyo.c
@@ -85,75 +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) {
-		if (tomoyo_prepend(&end, &buflen, table->procname) ||
-		    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)
 {
@@ -274,9 +205,6 @@ 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,