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mknod: take sanity checks on mode into the very beginning 

Note that applying umask can't affect their results.  While
that affects errno in cases like
	mknod("/no_such_directory/a", 030000)
yielding -EINVAL (due to impossible mode_t) instead of
-ENOENT (due to inexistent directory), IMO that makes a lot
more sense, POSIX allows to return either and any software
that relies on getting -ENOENT instead of -EINVAL in that
case deserves everything it gets.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2012-07-20 01:17:26 +04:00
parent 921a1650de
commit 8e4bfca1d1
1 changed files with 3 additions and 5 deletions
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8
fs/namei.c
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@ -2964,8 +2964,9 @@ SYSCALL_DEFINE4(mknodat, int, dfd, const char __user *, filename, umode_t, mode,
struct path path;
int error;
if (S_ISDIR(mode))
return -EPERM;
error = may_mknod(mode);
if (error)
return error;
dentry = user_path_create(dfd, filename, &path, 0);
if (IS_ERR(dentry))
@ -2973,9 +2974,6 @@ SYSCALL_DEFINE4(mknodat, int, dfd, const char __user *, filename, umode_t, mode,
if (!IS_POSIXACL(path.dentry->d_inode))
mode &= ~current_umask();
error = may_mknod(mode);
if (error)
goto out_dput;
error = mnt_want_write(path.mnt);
if (error)
goto out_dput;