Release 4.18 security/apparmor/secid.c
/*
* AppArmor security module
*
* This file contains AppArmor security identifier (secid) manipulation fns
*
* Copyright 2009-2017 Canonical Ltd.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation, version 2 of the
* License.
*
*
* AppArmor allocates a unique secid for every label used. If a label
* is replaced it receives the secid of the label it is replacing.
*/
#include <linux/errno.h>
#include <linux/err.h>
#include <linux/gfp.h>
#include <linux/idr.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include "include/cred.h"
#include "include/lib.h"
#include "include/secid.h"
#include "include/label.h"
#include "include/policy_ns.h"
/*
* secids - do not pin labels with a refcount. They rely on the label
* properly updating/freeing them
*/
#define AA_FIRST_SECID 1
static DEFINE_IDR(aa_secids);
static DEFINE_SPINLOCK(secid_lock);
/*
* TODO: allow policy to reserve a secid range?
* TODO: add secid pinning
* TODO: use secid_update in label replace
*/
/**
* aa_secid_update - update a secid mapping to a new label
* @secid: secid to update
* @label: label the secid will now map to
*/
void aa_secid_update(u32 secid, struct aa_label *label)
{
unsigned long flags;
spin_lock_irqsave(&secid_lock, flags);
idr_replace(&aa_secids, label, secid);
spin_unlock_irqrestore(&secid_lock, flags);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| John Johansen | 38 | 88.37% | 1 | 50.00% |
| Matthew Wilcox | 5 | 11.63% | 1 | 50.00% |
| Total | 43 | 100.00% | 2 | 100.00% |
/**
*
* see label for inverse aa_label_to_secid
*/
struct aa_label *aa_secid_to_label(u32 secid)
{
struct aa_label *label;
rcu_read_lock();
label = idr_find(&aa_secids, secid);
rcu_read_unlock();
return label;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| John Johansen | 32 | 94.12% | 1 | 50.00% |
| Matthew Wilcox | 2 | 5.88% | 1 | 50.00% |
| Total | 34 | 100.00% | 2 | 100.00% |
int apparmor_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
{
/* TODO: cache secctx and ref count so we don't have to recreate */
struct aa_label *label = aa_secid_to_label(secid);
int len;
AA_BUG(!secdata);
AA_BUG(!seclen);
if (!label)
return -EINVAL;
if (secdata)
len = aa_label_asxprint(secdata, root_ns, label,
FLAG_SHOW_MODE | FLAG_VIEW_SUBNS |
FLAG_HIDDEN_UNCONFINED | FLAG_ABS_ROOT,
GFP_ATOMIC);
else
len = aa_label_snxprint(NULL, 0, root_ns, label,
FLAG_SHOW_MODE | FLAG_VIEW_SUBNS |
FLAG_HIDDEN_UNCONFINED | FLAG_ABS_ROOT);
if (len < 0)
return -ENOMEM;
*seclen = len;
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| John Johansen | 117 | 100.00% | 2 | 100.00% |
| Total | 117 | 100.00% | 2 | 100.00% |
int apparmor_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid)
{
struct aa_label *label;
label = aa_label_strn_parse(&root_ns->unconfined->label, secdata,
seclen, GFP_KERNEL, false, false);
if (IS_ERR(label))
return PTR_ERR(label);
*secid = label->secid;
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| John Johansen | 67 | 100.00% | 1 | 100.00% |
| Total | 67 | 100.00% | 1 | 100.00% |
void apparmor_release_secctx(char *secdata, u32 seclen)
{
kfree(secdata);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| John Johansen | 17 | 100.00% | 1 | 100.00% |
| Total | 17 | 100.00% | 1 | 100.00% |
/**
* aa_alloc_secid - allocate a new secid for a profile
* @label: the label to allocate a secid for
* @gfp: memory allocation flags
*
* Returns: 0 with @label->secid initialized
* <0 returns error with @label->secid set to AA_SECID_INVALID
*/
int aa_alloc_secid(struct aa_label *label, gfp_t gfp)
{
unsigned long flags;
int ret;
idr_preload(gfp);
spin_lock_irqsave(&secid_lock, flags);
ret = idr_alloc(&aa_secids, label, AA_FIRST_SECID, 0, GFP_ATOMIC);
spin_unlock_irqrestore(&secid_lock, flags);
idr_preload_end();
if (ret < 0) {
label->secid = AA_SECID_INVALID;
return ret;
}
AA_BUG(ret == AA_SECID_INVALID);
label->secid = ret;
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| John Johansen | 85 | 91.40% | 4 | 80.00% |
| Matthew Wilcox | 8 | 8.60% | 1 | 20.00% |
| Total | 93 | 100.00% | 5 | 100.00% |
/**
* aa_free_secid - free a secid
* @secid: secid to free
*/
void aa_free_secid(u32 secid)
{
unsigned long flags;
spin_lock_irqsave(&secid_lock, flags);
idr_remove(&aa_secids, secid);
spin_unlock_irqrestore(&secid_lock, flags);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| John Johansen | 32 | 88.89% | 3 | 75.00% |
| Matthew Wilcox | 4 | 11.11% | 1 | 25.00% |
| Total | 36 | 100.00% | 4 | 100.00% |
void aa_secids_init(void)
{
idr_init_base(&aa_secids, AA_FIRST_SECID);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| John Johansen | 15 | 100.00% | 1 | 100.00% |
| Total | 15 | 100.00% | 1 | 100.00% |
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| John Johansen | 453 | 94.77% | 5 | 83.33% |
| Matthew Wilcox | 25 | 5.23% | 1 | 16.67% |
| Total | 478 | 100.00% | 6 | 100.00% |
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