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From: Herbert Poetzl <herbert@13thfloor.at>
To: Linus Torvalds <torvalds@osdl.org>, Andrew Morton <akpm@osdl.org>,
	Christoph Hellwig <hch@infradead.org>,
	Al Viro <viro@ftp.linux.org.uk>,
	Linux Kernel ML <linux-kernel@vger.kernel.org>
Subject: [PATCH 5/6] vfs: propagate the vfsmount into *xattr()
Date: Sat, 21 Jan 2006 09:43:01 +0100	[thread overview]
Message-ID: <20060121084301.GF10044@MAIL.13thfloor.at> (raw)
In-Reply-To: <20060121083843.GA10044@MAIL.13thfloor.at>


;
; Bind Mount Extensions
;
; Copyright (C) 2003-2006 Herbert Pötzl <herbert@13thfloor.at>
;
; propagate the vfsmount into both setxattr() and removexattr()
; to allow for vfsmount based checks there ensuring that
; the vfsmount isn't read-only
;
;
; Changelog:
;
;   0.01  - broken out part from bme0.05
;

Signed-off-by: Herbert Pötzl <herbert@13thfloor.at>

diff -NurpP --minimal linux-2.6.16-rc1/fs/xattr.c linux-2.6.16-rc1-bme0.06.2-xa0.01/fs/xattr.c
--- linux-2.6.16-rc1/fs/xattr.c	2006-01-18 06:08:35 +0100
+++ linux-2.6.16-rc1-bme0.06.2-xa0.01/fs/xattr.c	2006-01-21 09:09:20 +0100
@@ -17,6 +17,7 @@
 #include <linux/syscalls.h>
 #include <linux/module.h>
 #include <linux/fsnotify.h>
+#include <linux/mount.h>
 #include <asm/uaccess.h>
 
 
@@ -167,7 +168,7 @@ EXPORT_SYMBOL_GPL(vfs_removexattr);
  */
 static long
 setxattr(struct dentry *d, char __user *name, void __user *value,
-	 size_t size, int flags)
+	 size_t size, int flags, struct vfsmount *mnt)
 {
 	int error;
 	void *kvalue = NULL;
@@ -194,6 +195,9 @@ setxattr(struct dentry *d, char __user *
 		}
 	}
 
+	if (MNT_IS_RDONLY(mnt))
+		return -EROFS;
+
 	error = vfs_setxattr(d, kname, kvalue, size, flags);
 	kfree(kvalue);
 	return error;
@@ -209,7 +213,7 @@ sys_setxattr(char __user *path, char __u
 	error = user_path_walk(path, &nd);
 	if (error)
 		return error;
-	error = setxattr(nd.dentry, name, value, size, flags);
+	error = setxattr(nd.dentry, name, value, size, flags, nd.mnt);
 	path_release(&nd);
 	return error;
 }
@@ -224,7 +228,7 @@ sys_lsetxattr(char __user *path, char __
 	error = user_path_walk_link(path, &nd);
 	if (error)
 		return error;
-	error = setxattr(nd.dentry, name, value, size, flags);
+	error = setxattr(nd.dentry, name, value, size, flags, nd.mnt);
 	path_release(&nd);
 	return error;
 }
@@ -239,7 +243,7 @@ sys_fsetxattr(int fd, char __user *name,
 	f = fget(fd);
 	if (!f)
 		return error;
-	error = setxattr(f->f_dentry, name, value, size, flags);
+	error = setxattr(f->f_dentry, name, value, size, flags, f->f_vfsmnt);
 	fput(f);
 	return error;
 }
@@ -412,7 +416,7 @@ sys_flistxattr(int fd, char __user *list
  * Extended attribute REMOVE operations
  */
 static long
-removexattr(struct dentry *d, char __user *name)
+removexattr(struct dentry *d, char __user *name, struct vfsmount *mnt)
 {
 	int error;
 	char kname[XATTR_NAME_MAX + 1];
@@ -423,6 +427,9 @@ removexattr(struct dentry *d, char __use
 	if (error < 0)
 		return error;
 
+	if (MNT_IS_RDONLY(mnt))
+		return -EROFS;
+
 	return vfs_removexattr(d, kname);
 }
 
@@ -435,7 +442,7 @@ sys_removexattr(char __user *path, char 
 	error = user_path_walk(path, &nd);
 	if (error)
 		return error;
-	error = removexattr(nd.dentry, name);
+	error = removexattr(nd.dentry, name, nd.mnt);
 	path_release(&nd);
 	return error;
 }
@@ -449,7 +456,7 @@ sys_lremovexattr(char __user *path, char
 	error = user_path_walk_link(path, &nd);
 	if (error)
 		return error;
-	error = removexattr(nd.dentry, name);
+	error = removexattr(nd.dentry, name, nd.mnt);
 	path_release(&nd);
 	return error;
 }
@@ -463,7 +470,7 @@ sys_fremovexattr(int fd, char __user *na
 	f = fget(fd);
 	if (!f)
 		return error;
-	error = removexattr(f->f_dentry, name);
+	error = removexattr(f->f_dentry, name, f->f_vfsmnt);
 	fput(f);
 	return error;
 }


  parent reply	other threads:[~2006-01-21  8:43 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-01-21  8:38 [PATCH 0/6] vfs: extend loopback (bind) mounts by mnt_flags Herbert Poetzl
2006-01-21  8:40 ` [PATCH 1/6] vfs: add missing MNT_RDONLY and macro to check Herbert Poetzl
2006-01-21  8:40 ` [PATCH 2/6] vfs: propagate mnt_flags into do_loopback/vfsmount Herbert Poetzl
2006-01-22 10:06   ` Suleiman Souhlal
2006-01-22 10:59     ` Suleiman Souhlal
2006-01-24 19:02   ` Christoph Hellwig
2006-01-26 21:04     ` Herbert Poetzl
2006-01-27 20:03     ` Herbert Poetzl
2006-04-01 17:02       ` Christoph Hellwig
2006-01-21  8:41 ` [PATCH 3/6] vfs: propagate vfsmount into chown_common() Herbert Poetzl
2006-01-21  8:42 ` [PATCH 4/6] vfs: propagate the nameidata into the relevant vfs_*() Herbert Poetzl
2006-01-21  8:43 ` Herbert Poetzl [this message]
2006-01-21  8:43 ` [PATCH 6/6] vfs: extend IS_RDONLY() checks to MNT_IS_RDONLY() Herbert Poetzl
2006-01-24 19:06 ` [PATCH 0/6] vfs: extend loopback (bind) mounts by mnt_flags Christoph Hellwig
2006-01-26 21:08   ` Herbert Poetzl

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