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[PATCH] sanitize __user_walk_fd() et.al.

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* 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>
This commit is contained in:
Al Viro
2008-07-22 09:59:21 -04:00
parent 256984a838
commit 2d8f30380a
13 changed files with 235 additions and 238 deletions
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20
fs/compat.c
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@@ -234,18 +234,18 @@ static int put_compat_statfs(struct compat_statfs __user *ubuf, struct kstatfs *
* The following statfs calls are copies of code from fs/open.c and
* should be checked against those from time to time
*/
asmlinkage long compat_sys_statfs(const char __user *path, struct compat_statfs __user *buf)
asmlinkage long compat_sys_statfs(const char __user *pathname, struct compat_statfs __user *buf)
{
struct nameidata nd;
struct path path;
int error;
error = user_path_walk(path, &nd);
error = user_path(pathname, &path);
if (!error) {
struct kstatfs tmp;
error = vfs_statfs(nd.path.dentry, &tmp);
error = vfs_statfs(path.dentry, &tmp);
if (!error)
error = put_compat_statfs(buf, &tmp);
path_put(&nd.path);
path_put(&path);
}
return error;
}
@@ -299,21 +299,21 @@ static int put_compat_statfs64(struct compat_statfs64 __user *ubuf, struct kstat
return 0;
}
asmlinkage long compat_sys_statfs64(const char __user *path, compat_size_t sz, struct compat_statfs64 __user *buf)
asmlinkage long compat_sys_statfs64(const char __user *pathname, compat_size_t sz, struct compat_statfs64 __user *buf)
{
struct nameidata nd;
struct path path;
int error;
if (sz != sizeof(*buf))
return -EINVAL;
error = user_path_walk(path, &nd);
error = user_path(pathname, &path);
if (!error) {
struct kstatfs tmp;
error = vfs_statfs(nd.path.dentry, &tmp);
error = vfs_statfs(path.dentry, &tmp);
if (!error)
error = put_compat_statfs64(buf, &tmp);
path_put(&nd.path);
path_put(&path);
}
return error;
}