This is a note to let you know that I've just added the patch titled
Subject: sysfs: Introduce sysfs_sd_setattr and fix sysfs_chmod
to my gregkh-2.6 tree. Its filename is
sysfs-introduce-sysfs_sd_setattr-and-fix-sysfs_chmod.patch
This tree can be found at
http://www.kernel.org/pub/linux/kernel/people/gregkh/gregkh-2.6/patches/
>From [EMAIL PROTECTED] Thu Jul 3 18:21:56 2008
From: Eric W. Biederman <[EMAIL PROTECTED]>
Date: Thu, 03 Jul 2008 18:11:40 -0700
Subject: sysfs: Introduce sysfs_sd_setattr and fix sysfs_chmod
To: Greg Kroah-Hartman <[EMAIL PROTECTED]>, Andrew Morton <[EMAIL PROTECTED]>
Cc: Tejun Heo <[EMAIL PROTECTED]>, Daniel Lezcano <[EMAIL PROTECTED]>, [EMAIL
PROTECTED], Al Viro <[EMAIL PROTECTED]>, Linux Containers <[EMAIL PROTECTED]>,
Benjamin Thery <[EMAIL PROTECTED]>, <[EMAIL PROTECTED]>
Message-ID: <[EMAIL PROTECTED]>
From: Eric W. Biederman <[EMAIL PROTECTED]>
Currently sysfs_chmod calls sys_setattr which in turn calls
inode_change_ok which checks to see if it is ok for the current user
space process to change tha attributes. Since sysfs_chmod_file has
only kernel mode clients denying them permission if user space is the
problem is completely inappropriate.
Therefore factor out sysfs_sd_setattr which does not call
inode_change_ok and modify sysfs_chmod_file to call it.
In addition setting victim_sd->s_mode explicitly in sysfs_chmod_file
is redundant so remove that as well.
Thanks to Tejun Heo <[EMAIL PROTECTED]>, and
Daniel Lezcano <[EMAIL PROTECTED]> for working on this
and spotting this case.
Signed-off-by: Eric W. Biederman <[EMAIL PROTECTED]>
Acked-by: Tejun Heo <[EMAIL PROTECTED]>
Signed-off-by: Greg Kroah-Hartman <[EMAIL PROTECTED]>
---
fs/sysfs/file.c | 5 +----
fs/sysfs/inode.c | 23 ++++++++++++++++-------
fs/sysfs/sysfs.h | 1 +
3 files changed, 18 insertions(+), 11 deletions(-)
--- a/fs/sysfs/file.c
+++ b/fs/sysfs/file.c
@@ -604,13 +604,10 @@ int sysfs_chmod_file(struct kobject *kob
newattrs.ia_mode = (mode & S_IALLUGO) | (inode->i_mode & ~S_IALLUGO);
newattrs.ia_valid = ATTR_MODE | ATTR_CTIME;
newattrs.ia_ctime = current_fs_time(inode->i_sb);
- rc = sysfs_setattr(victim, &newattrs);
+ rc = sysfs_sd_setattr(victim_sd, inode, &newattrs);
if (rc == 0) {
fsnotify_change(victim, newattrs.ia_valid);
- mutex_lock(&sysfs_mutex);
- victim_sd->s_mode = newattrs.ia_mode;
- mutex_unlock(&sysfs_mutex);
}
mutex_unlock(&inode->i_mutex);
--- a/fs/sysfs/inode.c
+++ b/fs/sysfs/inode.c
@@ -42,10 +42,9 @@ int __init sysfs_inode_init(void)
return bdi_init(&sysfs_backing_dev_info);
}
-int sysfs_setattr(struct dentry * dentry, struct iattr * iattr)
+int sysfs_sd_setattr(struct sysfs_dirent *sd, struct inode *inode,
+ struct iattr * iattr)
{
- struct inode * inode = dentry->d_inode;
- struct sysfs_dirent * sd = dentry->d_fsdata;
struct iattr * sd_iattr;
unsigned int ia_valid = iattr->ia_valid;
int error;
@@ -55,10 +54,6 @@ int sysfs_setattr(struct dentry * dentry
sd_iattr = sd->s_iattr;
- error = inode_change_ok(inode, iattr);
- if (error)
- return error;
-
iattr->ia_valid &= ~ATTR_SIZE; /* ignore size changes */
error = inode_setattr(inode, iattr);
@@ -104,6 +99,20 @@ int sysfs_setattr(struct dentry * dentry
return error;
}
+int sysfs_setattr(struct dentry *dentry, struct iattr *iattr)
+{
+ struct inode * inode = dentry->d_inode;
+ struct sysfs_dirent * sd = dentry->d_fsdata;
+ int error;
+
+ error = inode_change_ok(inode, iattr);
+ if (error)
+ return error;
+
+ return sysfs_sd_setattr(sd, inode, iattr);
+}
+
+
static inline void set_default_inode_attr(struct inode * inode, mode_t mode)
{
inode->i_mode = mode;
--- a/fs/sysfs/sysfs.h
+++ b/fs/sysfs/sysfs.h
@@ -156,6 +156,7 @@ static inline void __sysfs_put(struct sy
* inode.c
*/
struct inode *sysfs_get_inode(struct sysfs_dirent *sd);
+int sysfs_sd_setattr(struct sysfs_dirent *sd, struct inode *inode, struct
iattr *iattr);
int sysfs_setattr(struct dentry *dentry, struct iattr *iattr);
int sysfs_hash_and_remove(struct sysfs_dirent *dir_sd, const char *name);
int sysfs_inode_init(void);
Patches currently in gregkh-2.6 which might be from [EMAIL PROTECTED] are
driver-core/kobject-fix-kobject_rename-and-config_sysfs.patch
driver-core/kobject-cleanup-kobject_rename-and-config_sysfs.patch
driver-core/sysfs-implement-__sysfs_get_dentry.patch
driver-core/sysfs-introduce-sysfs_sd_setattr-and-fix-sysfs_chmod.patch
driver-core/sysfs-sysfs_get_dentry-add-a-sb-parameter.patch
driver-core/sysfs-rename-support-multiple-superblocks.patch
driver-core/sysfs-support-for-preventing-unmounts.patch
driver-core/sysfs-sysfs_chmod_file-handle-multiple-superblocks.patch
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