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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 <dhowells@redhat.com>
Acked-by: James Morris <jmorris@namei.org>
Signed-off-by: James Morris <jmorris@namei.org>
This commit is contained in:
David Howells
2008-11-14 10:39:22 +11:00
committed by James Morris
parent 88e67f3b88
commit 745ca2475a
19 changed files with 67 additions and 40 deletions
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11
ipc/mqueue.c
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@@ -594,6 +594,7 @@ static int mq_attr_ok(struct mq_attr *attr)
static struct file *do_create(struct dentry *dir, struct dentry *dentry,
int oflag, mode_t mode, struct mq_attr __user *u_attr)
{
const struct cred *cred = current_cred();
struct mq_attr attr;
struct file *result;
int ret;
@@ -618,7 +619,7 @@ static struct file *do_create(struct dentry *dir, struct dentry *dentry,
if (ret)
goto out_drop_write;
result = dentry_open(dentry, mqueue_mnt, oflag);
result = dentry_open(dentry, mqueue_mnt, oflag, cred);
/*
* dentry_open() took a persistent mnt_want_write(),
* so we can now drop this one.
@@ -637,8 +638,10 @@ out:
/* Opens existing queue */
static struct file *do_open(struct dentry *dentry, int oflag)
{
static int oflag2acc[O_ACCMODE] = { MAY_READ, MAY_WRITE,
MAY_READ | MAY_WRITE };
const struct cred *cred = current_cred();
static const int oflag2acc[O_ACCMODE] = { MAY_READ, MAY_WRITE,
MAY_READ | MAY_WRITE };
if ((oflag & O_ACCMODE) == (O_RDWR | O_WRONLY)) {
dput(dentry);
@@ -652,7 +655,7 @@ static int oflag2acc[O_ACCMODE] = { MAY_READ, MAY_WRITE,
return ERR_PTR(-EACCES);
}
return dentry_open(dentry, mqueue_mnt, oflag);
return dentry_open(dentry, mqueue_mnt, oflag, cred);
}
asmlinkage long sys_mq_open(const char __user *u_name, int oflag, mode_t mode,