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authorAl Viro <viro@zeniv.linux.org.uk>2008-07-22 09:59:21 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2008-07-26 20:53:34 -0400
commit2d8f30380ab8c706f4e0a8f1aaa22b5886e9ac8a (patch)
treeb798097fd831eab39f35c8c2e5a8ccfd7a850ef5 /fs/namei.c
parent256984a83880ff7ac78055cb87baea48137f0b77 (diff)
downloadlwn-2d8f30380ab8c706f4e0a8f1aaa22b5886e9ac8a.tar.gz
lwn-2d8f30380ab8c706f4e0a8f1aaa22b5886e9ac8a.zip
[PATCH] sanitize __user_walk_fd() et.al.
* do not pass nameidata; struct path is all the callers want. * switch to new helpers: user_path_at(dfd, pathname, flags, &path) user_path(pathname, &path) user_lpath(pathname, &path) user_path_dir(pathname, &path) (fail if not a directory) The last 3 are trivial macro wrappers for the first one. * remove nameidata in callers. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/namei.c')
-rw-r--r--fs/namei.c36
1 files changed, 18 insertions, 18 deletions
diff --git a/fs/namei.c b/fs/namei.c
index 5029b93ebbd5..edb5e973f9b3 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -1334,24 +1334,24 @@ struct dentry *lookup_one_noperm(const char *name, struct dentry *base)
return __lookup_hash(&this, base, NULL);
}
-int __user_walk_fd(int dfd, const char __user *name, unsigned flags,
- struct nameidata *nd)
+int user_path_at(int dfd, const char __user *name, unsigned flags,
+ struct path *path)
{
+ struct nameidata nd;
char *tmp = getname(name);
int err = PTR_ERR(tmp);
-
if (!IS_ERR(tmp)) {
- err = do_path_lookup(dfd, tmp, flags, nd);
+
+ BUG_ON(flags & LOOKUP_PARENT);
+
+ err = do_path_lookup(dfd, tmp, flags, &nd);
putname(tmp);
+ if (!err)
+ *path = nd.path;
}
return err;
}
-int __user_walk(const char __user *name, unsigned flags, struct nameidata *nd)
-{
- return __user_walk_fd(AT_FDCWD, name, flags, nd);
-}
-
/*
* It's inline, so penalty for filesystems that don't use sticky bit is
* minimal.
@@ -2446,7 +2446,8 @@ asmlinkage long sys_linkat(int olddfd, const char __user *oldname,
int flags)
{
struct dentry *new_dentry;
- struct nameidata nd, old_nd;
+ struct nameidata nd;
+ struct path old_path;
int error;
char * to;
@@ -2457,16 +2458,16 @@ asmlinkage long sys_linkat(int olddfd, const char __user *oldname,
if (IS_ERR(to))
return PTR_ERR(to);
- error = __user_walk_fd(olddfd, oldname,
- flags & AT_SYMLINK_FOLLOW ? LOOKUP_FOLLOW : 0,
- &old_nd);
+ error = user_path_at(olddfd, oldname,
+ flags & AT_SYMLINK_FOLLOW ? LOOKUP_FOLLOW : 0,
+ &old_path);
if (error)
goto exit;
error = do_path_lookup(newdfd, to, LOOKUP_PARENT, &nd);
if (error)
goto out;
error = -EXDEV;
- if (old_nd.path.mnt != nd.path.mnt)
+ if (old_path.mnt != nd.path.mnt)
goto out_release;
new_dentry = lookup_create(&nd, 0);
error = PTR_ERR(new_dentry);
@@ -2475,7 +2476,7 @@ asmlinkage long sys_linkat(int olddfd, const char __user *oldname,
error = mnt_want_write(nd.path.mnt);
if (error)
goto out_dput;
- error = vfs_link(old_nd.path.dentry, nd.path.dentry->d_inode, new_dentry);
+ error = vfs_link(old_path.dentry, nd.path.dentry->d_inode, new_dentry);
mnt_drop_write(nd.path.mnt);
out_dput:
dput(new_dentry);
@@ -2484,7 +2485,7 @@ out_unlock:
out_release:
path_put(&nd.path);
out:
- path_put(&old_nd.path);
+ path_put(&old_path);
exit:
putname(to);
@@ -2877,8 +2878,7 @@ const struct inode_operations page_symlink_inode_operations = {
.put_link = page_put_link,
};
-EXPORT_SYMBOL(__user_walk);
-EXPORT_SYMBOL(__user_walk_fd);
+EXPORT_SYMBOL(user_path_at);
EXPORT_SYMBOL(follow_down);
EXPORT_SYMBOL(follow_up);
EXPORT_SYMBOL(get_write_access); /* binfmt_aout */