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[PATCH] selinux: extend selinuxfs context interface

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This patch extends the selinuxfs context interface to allow return the
canonical form of the context to userspace.

Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
Signed-off-by: James Morris <jmorris@namei.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Stephen Smalley 2005-11-08 21:34:33 -08:00 committed by Linus Torvalds
parent 25a74f3ba8
commit ce9982d048
1 changed files with 21 additions and 28 deletions
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49
security/selinux/selinuxfs.c
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@ -271,46 +271,38 @@ static struct file_operations sel_load_ops = {
.write = sel_write_load,
};
static ssize_t sel_write_context(struct file * file, const char __user * buf,
size_t count, loff_t *ppos)
static ssize_t sel_write_context(struct file * file, char *buf, size_t size)
{
char *page;
u32 sid;
char *canon;
u32 sid, len;
ssize_t length;
length = task_has_security(current, SECURITY__CHECK_CONTEXT);
if (length)
return length;
if (count >= PAGE_SIZE)
return -ENOMEM;
if (*ppos != 0) {
/* No partial writes. */
return -EINVAL;
}
page = (char*)get_zeroed_page(GFP_KERNEL);
if (!page)
return -ENOMEM;
length = -EFAULT;
if (copy_from_user(page, buf, count))
goto out;
length = security_context_to_sid(page, count, &sid);
length = security_context_to_sid(buf, size, &sid);
if (length < 0)
goto out;
return length;
length = count;
length = security_sid_to_context(sid, &canon, &len);
if (length < 0)
return length;
if (len > SIMPLE_TRANSACTION_LIMIT) {
printk(KERN_ERR "%s: context size (%u) exceeds payload "
"max\n", __FUNCTION__, len);
length = -ERANGE;
goto out;
}
memcpy(buf, canon, len);
length = len;
out:
free_page((unsigned long) page);
kfree(canon);
return length;
}
static struct file_operations sel_context_ops = {
.write = sel_write_context,
};
static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf,
size_t count, loff_t *ppos)
{
@ -375,6 +367,7 @@ static ssize_t (*write_op[])(struct file *, char *, size_t) = {
[SEL_RELABEL] = sel_write_relabel,
[SEL_USER] = sel_write_user,
[SEL_MEMBER] = sel_write_member,
[SEL_CONTEXT] = sel_write_context,
};
static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
@ -1220,7 +1213,7 @@ static int sel_fill_super(struct super_block * sb, void * data, int silent)
static struct tree_descr selinux_files[] = {
[SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR},
[SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR},
[SEL_CONTEXT] = {"context", &sel_context_ops, S_IRUGO|S_IWUGO},
[SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO},
[SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO},
[SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO},
[SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO},