1 files changed, 9 insertions, 2 deletions

diff --git a/fs/proc/proc_sysctl.c b/fs/proc/proc_sysctl.c
index 945a81043ba2..7b997754a25e 100644
--- a/fs/proc/proc_sysctl.c
+++ b/fs/proc/proc_sysctl.c
@@ -298,13 +298,19 @@ static int proc_sys_permission(struct inode *inode, int mask)
          * sysctl entries that are not writeable,
          * are _NOT_ writeable, capabilities or not.
          */
-        struct ctl_table_header *head = grab_header(inode);
-        struct ctl_table *table = PROC_I(inode)->sysctl_entry;
+        struct ctl_table_header *head;
+        struct ctl_table *table;
         int error;
 
+        /* Executable files are not allowed under /proc/sys/ */
+        if ((mask & MAY_EXEC) && S_ISREG(inode->i_mode))
+                return -EACCES;
+
+        head = grab_header(inode);
         if (IS_ERR(head))
                 return PTR_ERR(head);
 
+        table = PROC_I(inode)->sysctl_entry;
         if (!table) /* global root - r-xr-xr-x */
                 error = mask & MAY_WRITE ? -EACCES : 0;
         else /* Use the permissions on the sysctl table entry */
@@ -353,6 +359,7 @@ static const struct file_operations proc_sys_file_operations = {
 
 static const struct file_operations proc_sys_dir_file_operations = {
         .readdir        = proc_sys_readdir,
+        .llseek         = generic_file_llseek,
 };
 
 static const struct inode_operations proc_sys_inode_operations = {