linux-kernel - [patch] fix sys_mknodat breakage from r/o bind mounts

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Message-Id: <E1IaJMd-000535-00@dorka.pomaz.szeredi.hu>
Date:	Wed, 26 Sep 2007 00:58:47 +0200
From:	Miklos Szeredi <miklos@...redi.hu>
To:	haveblue@...ibm.com
CC:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org
Subject: [patch] fix sys_mknodat breakage from r/o bind mounts

From: Miklos Szeredi <mszeredi@...e.cz>

mknod("foo", 0644) returns EINVAL, even though it should succeed.

The responsible patch is this:

r-o-bind-mounts-sys_mknodat-elevate-write-count-for-vfs_mknod-create.patch

Signed-off-by: Miklos Szeredi <mszeredi@...e.cz>
---

Index: linux/fs/namei.c
===================================================================
--- linux.orig/fs/namei.c	2007-09-26 00:36:15.000000000 +0200
+++ linux/fs/namei.c	2007-09-26 00:51:19.000000000 +0200
@@ -1984,7 +1984,7 @@ asmlinkage long sys_mknodat(int dfd, con
 		goto out_dput;
 	}
 	if (!S_ISREG(mode)  && !S_ISCHR(mode)  && !S_ISBLK(mode) &&
-	    !S_ISFIFO(mode) && !S_ISSOCK(mode) && mode != 0) {
+	    !S_ISFIFO(mode) && !S_ISSOCK(mode) && (mode & S_IFMT) != 0) {
 		error = -EINVAL;
 		goto out_dput;
 	}

-
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