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CRED: Pass credentials through dentry_open()

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Pass credentials through dentry_open() so that the COW creds patch can have
SELinux's flush_unauthorized_files() pass the appropriate creds back to itself
when it opens its null chardev.

The security_dentry_open() call also now takes a creds pointer, as does the
dentry_open hook in struct security_operations.

Signed-off-by: David Howells <[email protected]>
Acked-by: James Morris <[email protected]>
Signed-off-by: James Morris <[email protected]>
This commit is contained in:
David Howells 2008-11-14 10:39:22 +11:00 • committed by James Morris
commit 745ca2475a
19 changed files with 67 additions and 40 deletions
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17
fs/open.c
View file

@ -783,7 +783,8 @@ static inline int __get_file_write_access(struct inode *inode,
static struct file *__dentry_open(struct dentry *dentry, struct vfsmount *mnt,
int flags, struct file *f,
int (*open)(struct inode *, struct file *))
int (*open)(struct inode *, struct file *),
const struct cred *cred)
{
struct inode *inode;
int error;
@ -807,7 +808,7 @@ static struct file *__dentry_open(struct dentry *dentry, struct vfsmount *mnt,
f->f_op = fops_get(inode->i_fop);
file_move(f, &inode->i_sb->s_files);
error = security_dentry_open(f);
error = security_dentry_open(f, cred);
if (error)
goto cleanup_all;
@ -882,6 +883,8 @@ cleanup_file:
struct file *lookup_instantiate_filp(struct nameidata *nd, struct dentry *dentry,
int (*open)(struct inode *, struct file *))
{
const struct cred *cred = current_cred();
if (IS_ERR(nd->intent.open.file))
goto out;
if (IS_ERR(dentry))
@ -889,7 +892,7 @@ struct file *lookup_instantiate_filp(struct nameidata *nd, struct dentry *dentry
nd->intent.open.file = __dentry_open(dget(dentry), mntget(nd->path.mnt),
nd->intent.open.flags - 1,
nd->intent.open.file,
open);
open, cred);
out:
return nd->intent.open.file;
out_err:
@ -908,6 +911,7 @@ EXPORT_SYMBOL_GPL(lookup_instantiate_filp);
*/
struct file *nameidata_to_filp(struct nameidata *nd, int flags)
{
const struct cred *cred = current_cred();
struct file *filp;
/* Pick up the filp from the open intent */
@ -915,7 +919,7 @@ struct file *nameidata_to_filp(struct nameidata *nd, int flags)
/* Has the filesystem initialised the file for us? */
if (filp->f_path.dentry == NULL)
filp = __dentry_open(nd->path.dentry, nd->path.mnt, flags, filp,
NULL);
NULL, cred);
else
path_put(&nd->path);
return filp;
@ -925,7 +929,8 @@ struct file *nameidata_to_filp(struct nameidata *nd, int flags)
* dentry_open() will have done dput(dentry) and mntput(mnt) if it returns an
* error.
*/
struct file *dentry_open(struct dentry *dentry, struct vfsmount *mnt, int flags)
struct file *dentry_open(struct dentry *dentry, struct vfsmount *mnt, int flags,
const struct cred *cred)
{
int error;
struct file *f;
@ -950,7 +955,7 @@ struct file *dentry_open(struct dentry *dentry, struct vfsmount *mnt, int flags)
return ERR_PTR(error);
}
return __dentry_open(dentry, mnt, flags, f, NULL);
return __dentry_open(dentry, mnt, flags, f, NULL, cred);
}
EXPORT_SYMBOL(dentry_open);