[PATCH] take noexec checks to very few callers that care

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --git a/fs/exec.c b/fs/exec.c
index 346e3f6..eca58c2 100644 (file)
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -118,6 +118,10 @@ asmlinkage long sys_uselib(const char __user * library)
        if (!S_ISREG(nd.path.dentry->d_inode->i_mode))
                goto exit;
 
+       error = -EACCES;
+       if (nd.path.mnt->mnt_flags & MNT_NOEXEC)
+               goto exit;
+
        error = vfs_permission(&nd, MAY_READ | MAY_EXEC | MAY_OPEN);
        if (error)
                goto exit;
@@ -668,6 +672,9 @@ struct file *open_exec(const char *name)
        if (!S_ISREG(nd.path.dentry->d_inode->i_mode))
                goto out_path_put;
 
+       if (nd.path.mnt->mnt_flags & MNT_NOEXEC)
+               goto out_path_put;
+
        err = vfs_permission(&nd, MAY_EXEC | MAY_OPEN);
        if (err)
                goto out_path_put;

diff --git a/fs/namei.c b/fs/namei.c
index 6d75430..396cb3e 100644 (file)
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -252,15 +252,6 @@ int permission(struct inode *inode, int mask, struct nameidata *nd)
                        return -EACCES;
        }
 
-       if ((mask & MAY_EXEC) && S_ISREG(inode->i_mode)) {
-               /*
-                * MAY_EXEC on regular files is denied if the fs is mounted
-                * with the "noexec" flag.
-                */
-               if (mnt && (mnt->mnt_flags & MNT_NOEXEC))
-                       return -EACCES;
-       }
-
        /* Ordinary permission routines do not understand MAY_APPEND. */
        if (inode->i_op && inode->i_op->permission) {
                retval = inode->i_op->permission(inode, mask);

diff --git a/fs/open.c b/fs/open.c
index 3b3c436..d5e421a 100644 (file)
--- a/fs/open.c
+++ b/fs/open.c
@@ -461,6 +461,16 @@ asmlinkage long sys_faccessat(int dfd, const char __user *filename, int mode)
        if (res)
                goto out;
 
+       if ((mode & MAY_EXEC) && S_ISREG(nd.path.dentry->d_inode->i_mode)) {
+               /*
+                * MAY_EXEC on regular files is denied if the fs is mounted
+                * with the "noexec" flag.
+                */
+               res = -EACCES;
+               if (nd.path.mnt->mnt_flags & MNT_NOEXEC)
+                       goto out_path_release;
+       }
+
        res = vfs_permission(&nd, mode | MAY_ACCESS);
        /* SuS v2 requires we report a read only fs too */
        if(res || !(mode & S_IWOTH) ||