init: use do_mount() instead of ksys_mount()

In prepare_namespace(), do_mount() can be used instead of ksys_mount()
as the first and third argument are const strings in the kernel, the
second and fourth argument are passed through anyway, and the fifth
argument is NULL.

In do_mount_root(), ksys_mount() is called with the first and third
argument being already kernelspace strings, which do not need to be
copied over from userspace to kernelspace (again). The second and
fourth arguments are passed through to do_mount() anyway. The fifth
argument, while already residing in kernelspace, needs to be put into
a page of its own. Then, do_mount() can be used instead of
ksys_mount().

Once this is done, there are no in-kernel users to ksys_mount() left,
which can therefore be removed.

Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>

diff --git a/fs/namespace.c b/fs/namespace.c
index 2fd0c8bcb8c147f28d83ddd883402e8a40a3b7cd..be601d3a800807360a0272c713d4abfc25795687 100644 (file)
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -3325,8 +3325,8 @@ struct dentry *mount_subtree(struct vfsmount *m, const char *name)
 }
 EXPORT_SYMBOL(mount_subtree);
 
-int ksys_mount(const char __user *dev_name, const char __user *dir_name,
-              const char __user *type, unsigned long flags, void __user *data)
+SYSCALL_DEFINE5(mount, char __user *, dev_name, char __user *, dir_name,
+               char __user *, type, unsigned long, flags, void __user *, data)
 {
        int ret;
        char *kernel_type;
@@ -3359,12 +3359,6 @@ out_type:
        return ret;
 }
 
-SYSCALL_DEFINE5(mount, char __user *, dev_name, char __user *, dir_name,
-               char __user *, type, unsigned long, flags, void __user *, data)
-{
-       return ksys_mount(dev_name, dir_name, type, flags, data);
-}
-
 /*
  * Create a kernel mount representation for a new, prepared superblock
  * (specified by fs_fd) and attach to an open_tree-like file descriptor.

diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
index d0391cc2dae90611d9ec91187342202300efc01c..5262b7a76d392b60769a93dde860a30e4b23481f 100644 (file)
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -1231,8 +1231,6 @@ asmlinkage long sys_ni_syscall(void);
  * the ksys_xyzyyz() functions prototyped below.
  */
 
-int ksys_mount(const char __user *dev_name, const char __user *dir_name,
-              const char __user *type, unsigned long flags, void __user *data);
 int ksys_umount(char __user *name, int flags);
 int ksys_dup(unsigned int fildes);
 int ksys_chroot(const char __user *filename);

diff --git a/init/do_mounts.c b/init/do_mounts.c
index 43f6d098c88062116bd992fb3fe570a3c7f97b96..f55cbd9cb8183f9a36b4da4e2f59c5a1720621c3 100644 (file)
--- a/init/do_mounts.c
+++ b/init/do_mounts.c
@@ -387,12 +387,25 @@ static void __init get_fs_names(char *page)
        *s = '\0';
 }
 
-static int __init do_mount_root(char *name, char *fs, int flags, void *data)
+static int __init do_mount_root(const char *name, const char *fs,
+                                const int flags, const void *data)
 {
        struct super_block *s;
-       int err = ksys_mount(name, "/root", fs, flags, data);
-       if (err)
-               return err;
+       char *data_page;
+       struct page *p;
+       int ret;
+
+       /* do_mount() requires a full page as fifth argument */
+       p = alloc_page(GFP_KERNEL);
+       if (!p)
+               return -ENOMEM;
+
+       data_page = page_address(p);
+       strncpy(data_page, data, PAGE_SIZE - 1);
+
+       ret = do_mount(name, "/root", fs, flags, data_page);
+       if (ret)
+               goto out;
 
        ksys_chdir("/root");
        s = current->fs->pwd.dentry->d_sb;
@@ -402,7 +415,10 @@ static int __init do_mount_root(char *name, char *fs, int flags, void *data)
               s->s_type->name,
               sb_rdonly(s) ? " readonly" : "",
               MAJOR(ROOT_DEV), MINOR(ROOT_DEV));
-       return 0;
+
+out:
+       put_page(p);
+       return ret;
 }
 
 void __init mount_block_root(char *name, int flags)
@@ -671,7 +687,7 @@ void __init prepare_namespace(void)
        mount_root();
 out:
        devtmpfs_mount();
-       ksys_mount(".", "/", NULL, MS_MOVE, NULL);
+       do_mount(".", "/", NULL, MS_MOVE, NULL);
        ksys_chroot(".");
 }