Release 4.11 security/selinux/ss/conditional.c

/* Authors: Karl MacMillan <kmacmillan@tresys.com>
 *          Frank Mayer <mayerf@tresys.com>
 *
 * Copyright (C) 2003 - 2004 Tresys Technology, LLC
 *      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.
 */

#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/spinlock.h>
#include <linux/slab.h>

#include "security.h"
#include "conditional.h"
#include "services.h"

/*
 * cond_evaluate_expr evaluates a conditional expr
 * in reverse polish notation. It returns true (1), false (0),
 * or undefined (-1). Undefined occurs when the expression
 * exceeds the stack depth of COND_EXPR_MAXDEPTH.
 */


static int cond_evaluate_expr(struct policydb *p, struct cond_expr *expr)
{

	struct cond_expr *cur;
	int s[COND_EXPR_MAXDEPTH];
	int sp = -1;

	for (cur = expr; cur; cur = cur->next) {
		switch (cur->expr_type) {
		case COND_BOOL:
			if (sp == (COND_EXPR_MAXDEPTH - 1))
				return -1;
			sp++;
			s[sp] = p->bool_val_to_struct[cur->bool - 1]->state;
			break;
		case COND_NOT:
			if (sp < 0)
				return -1;
			s[sp] = !s[sp];
			break;
		case COND_OR:
			if (sp < 1)
				return -1;
			sp--;
			s[sp] |= s[sp + 1];
			break;
		case COND_AND:
			if (sp < 1)
				return -1;
			sp--;
			s[sp] &= s[sp + 1];
			break;
		case COND_XOR:
			if (sp < 1)
				return -1;
			sp--;
			s[sp] ^= s[sp + 1];
			break;
		case COND_EQ:
			if (sp < 1)
				return -1;
			sp--;
			s[sp] = (s[sp] == s[sp + 1]);
			break;
		case COND_NEQ:
			if (sp < 1)
				return -1;
			sp--;
			s[sp] = (s[sp] != s[sp + 1]);
			break;
		default:
			return -1;
		}
	}
	return s[0];
}

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/*
 * evaluate_cond_node evaluates the conditional stored in
 * a struct cond_node and if the result is different than the
 * current state of the node it sets the rules in the true/false
 * list appropriately. If the result of the expression is undefined
 * all of the rules are disabled for safety.
 */


int evaluate_cond_node(struct policydb *p, struct cond_node *node)
{
	int new_state;
	struct cond_av_list *cur;

	new_state = cond_evaluate_expr(p, node->expr);
	if (new_state != node->cur_state) {
		node->cur_state = new_state;
		if (new_state == -1)
			printk(KERN_ERR "SELinux: expression result was undefined - disabling all rules.\n");
		/* turn the rules on or off */
		for (cur = node->true_list; cur; cur = cur->next) {
			if (new_state <= 0)
				cur->node->key.specified &= ~AVTAB_ENABLED;
			else
				cur->node->key.specified |= AVTAB_ENABLED;
		}

		for (cur = node->false_list; cur; cur = cur->next) {
			/* -1 or 1 */
			if (new_state)
				cur->node->key.specified &= ~AVTAB_ENABLED;
			else
				cur->node->key.specified |= AVTAB_ENABLED;
		}
	}
	return 0;
}

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int cond_policydb_init(struct policydb *p)
{
	int rc;

	p->bool_val_to_struct = NULL;
	p->cond_list = NULL;

	rc = avtab_init(&p->te_cond_avtab);
	if (rc)
		return rc;

	return 0;
}

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static void cond_av_list_destroy(struct cond_av_list *list)
{
	struct cond_av_list *cur, *next;
	for (cur = list; cur; cur = next) {
		next = cur->next;
		/* the avtab_ptr_t node is destroy by the avtab */
		kfree(cur);
	}
}

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static void cond_node_destroy(struct cond_node *node)
{
	struct cond_expr *cur_expr, *next_expr;

	for (cur_expr = node->expr; cur_expr; cur_expr = next_expr) {
		next_expr = cur_expr->next;
		kfree(cur_expr);
	}
	cond_av_list_destroy(node->true_list);
	cond_av_list_destroy(node->false_list);
	kfree(node);
}

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static void cond_list_destroy(struct cond_node *list)
{
	struct cond_node *next, *cur;

	if (list == NULL)
		return;

	for (cur = list; cur; cur = next) {
		next = cur->next;
		cond_node_destroy(cur);
	}
}

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void cond_policydb_destroy(struct policydb *p)
{
	kfree(p->bool_val_to_struct);
	avtab_destroy(&p->te_cond_avtab);
	cond_list_destroy(p->cond_list);
}

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int cond_init_bool_indexes(struct policydb *p)
{
	kfree(p->bool_val_to_struct);
	p->bool_val_to_struct =
		kmalloc(p->p_bools.nprim * sizeof(struct cond_bool_datum *), GFP_KERNEL);
	if (!p->bool_val_to_struct)
		return -ENOMEM;
	return 0;
}

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int cond_destroy_bool(void *key, void *datum, void *p)
{
	kfree(key);
	kfree(datum);
	return 0;
}

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int cond_index_bool(void *key, void *datum, void *datap)
{
	struct policydb *p;
	struct cond_bool_datum *booldatum;
	struct flex_array *fa;

	booldatum = datum;
	p = datap;

	if (!booldatum->value || booldatum->value > p->p_bools.nprim)
		return -EINVAL;

	fa = p->sym_val_to_name[SYM_BOOLS];
	if (flex_array_put_ptr(fa, booldatum->value - 1, key,
			       GFP_KERNEL | __GFP_ZERO))
		BUG();
	p->bool_val_to_struct[booldatum->value - 1] = booldatum;

	return 0;
}

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static int bool_isvalid(struct cond_bool_datum *b)
{
	if (!(b->state == 0 || b->state == 1))
		return 0;
	return 1;
}

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int cond_read_bool(struct policydb *p, struct hashtab *h, void *fp)
{
	char *key = NULL;
	struct cond_bool_datum *booldatum;
	__le32 buf[3];
	u32 len;
	int rc;

	booldatum = kzalloc(sizeof(struct cond_bool_datum), GFP_KERNEL);
	if (!booldatum)
		return -ENOMEM;

	rc = next_entry(buf, fp, sizeof buf);
	if (rc)
		goto err;

	booldatum->value = le32_to_cpu(buf[0]);
	booldatum->state = le32_to_cpu(buf[1]);

	rc = -EINVAL;
	if (!bool_isvalid(booldatum))
		goto err;

	len = le32_to_cpu(buf[2]);
	if (((len == 0) || (len == (u32)-1)))
		goto err;

	rc = -ENOMEM;
	key = kmalloc(len + 1, GFP_KERNEL);
	if (!key)
		goto err;
	rc = next_entry(key, fp, len);
	if (rc)
		goto err;
	key[len] = '\0';
	rc = hashtab_insert(h, key, booldatum);
	if (rc)
		goto err;

	return 0;
err:
	cond_destroy_bool(key, booldatum, NULL);
	return rc;
}

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22
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Dan Carpenter
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1
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Alexey Dobriyan
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Chris Wright
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James Morris
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Vesa-Matti J Kari
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struct cond_insertf_data {
	
struct policydb *p;
	
struct cond_av_list *other;
	
struct cond_av_list *head;
	
struct cond_av_list *tail;
};



static int cond_insertf(struct avtab *a, struct avtab_key *k, struct avtab_datum *d, void *ptr)
{
	struct cond_insertf_data *data = ptr;
	struct policydb *p = data->p;
	struct cond_av_list *other = data->other, *list, *cur;
	struct avtab_node *node_ptr;
	u8 found;
	int rc = -EINVAL;

	/*
         * For type rules we have to make certain there aren't any
         * conflicting rules by searching the te_avtab and the
         * cond_te_avtab.
         */
	if (k->specified & AVTAB_TYPE) {
		if (avtab_search(&p->te_avtab, k)) {
			printk(KERN_ERR "SELinux: type rule already exists outside of a conditional.\n");
			goto err;
		}
		/*
                 * If we are reading the false list other will be a pointer to
                 * the true list. We can have duplicate entries if there is only
                 * 1 other entry and it is in our true list.
                 *
                 * If we are reading the true list (other == NULL) there shouldn't
                 * be any other entries.
                 */
		if (other) {
			node_ptr = avtab_search_node(&p->te_cond_avtab, k);
			if (node_ptr) {
				if (avtab_search_node_next(node_ptr, k->specified)) {
					printk(KERN_ERR "SELinux: too many conflicting type rules.\n");
					goto err;
				}
				found = 0;
				for (cur = other; cur; cur = cur->next) {
					if (cur->node == node_ptr) {
						found = 1;
						break;
					}
				}
				if (!found) {
					printk(KERN_ERR "SELinux: conflicting type rules.\n");
					goto err;
				}
			}
		} else {
			if (avtab_search(&p->te_cond_avtab, k)) {
				printk(KERN_ERR "SELinux: conflicting type rules when adding type rule for true.\n");
				goto err;
			}
		}
	}

	node_ptr = avtab_insert_nonunique(&p->te_cond_avtab, k, d);
	if (!node_ptr) {
		printk(KERN_ERR "SELinux: could not insert rule.\n");
		rc = -ENOMEM;
		goto err;
	}

	list = kzalloc(sizeof(struct cond_av_list), GFP_KERNEL);
	if (!list) {
		rc = -ENOMEM;
		goto err;
	}

	list->node = node_ptr;
	if (!data->head)
		data->head = list;
	else
		data->tail->next = list;
	data->tail = list;
	return 0;

err:
	cond_av_list_destroy(data->head);
	data->head = NULL;
	return rc;
}

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71.10%
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Stephen D. Smalley
70
20.23%
2
28.57%
Dan Carpenter
19
5.49%
1
14.29%
Eric Paris
8
2.31%
1
14.29%
James Morris
3
0.87%
2
28.57%
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346
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7
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static int cond_read_av_list(struct policydb *p, void *fp, struct cond_av_list **ret_list, struct cond_av_list *other)
{
	int i, rc;
	__le32 buf[1];
	u32 len;
	struct cond_insertf_data data;

	*ret_list = NULL;

	len = 0;
	rc = next_entry(buf, fp, sizeof(u32));
	if (rc)
		return rc;

	len = le32_to_cpu(buf[0]);
	if (len == 0)
		return 0;

	data.p = p;
	data.other = other;
	data.head = NULL;
	data.tail = NULL;
	for (i = 0; i < len; i++) {
		rc = avtab_read_item(&p->te_cond_avtab, fp, p, cond_insertf,
				     &data);
		if (rc)
			return rc;
	}

	*ret_list = data.head;
	return 0;
}

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156
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8
4.76%
1
20.00%
Alexey Dobriyan
3
1.79%
1
20.00%
Dan Carpenter
1
0.60%
1
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static int expr_isvalid(struct policydb *p, struct cond_expr *expr)
{
	if (expr->expr_type <= 0 || expr->expr_type > COND_LAST) {
		printk(KERN_ERR "SELinux: conditional expressions uses unknown operator.\n");
		return 0;
	}

	if (expr->bool > p->p_bools.nprim) {
		printk(KERN_ERR "SELinux: conditional expressions uses unknown bool.\n");
		return 0;
	}
	return 1;
}

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1
33.33%
Eric Paris
2
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1
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67
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3
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static int cond_read_node(struct policydb *p, struct cond_node *node, void *fp)
{
	__le32 buf[2];
	u32 len, i;
	int rc;
	struct cond_expr *expr = NULL, *last = NULL;

	rc = next_entry(buf, fp, sizeof(u32) * 2);
	if (rc)
		goto err;

	node->cur_state = le32_to_cpu(buf[0]);

	/* expr */
	len = le32_to_cpu(buf[1]);

	for (i = 0; i < len; i++) {
		rc = next_entry(buf, fp, sizeof(u32) * 2);
		if (rc)
			goto err;

		rc = -ENOMEM;
		expr = kzalloc(sizeof(struct cond_expr), GFP_KERNEL);
		if (!expr)
			goto err;

		expr->expr_type = le32_to_cpu(buf[0]);
		expr->bool = le32_to_cpu(buf[1]);

		if (!expr_isvalid(p, expr)) {
			rc = -EINVAL;
			kfree(expr);
			goto err;
		}

		if (i == 0)
			node->expr = expr;
		else
			last->next = expr;
		last = expr;
	}

	rc = cond_read_av_list(p, fp, &node->true_list, NULL);
	if (rc)
		goto err;
	rc = cond_read_av_list(p, fp, &node->false_list, node->true_list);
	if (rc)
		goto err;
	return 0;
err:
	cond_node_destroy(node);
	return rc;
}

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7.96%
1
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Stephen D. Smalley
16
5.54%
1
12.50%
Alexander Nyberg
7
2.42%
1
12.50%
Namhyung Kim
6
2.08%
2
25.00%
Alexey Dobriyan
3
1.04%
1
12.50%
James Morris
1
0.35%
1
12.50%
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8
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int cond_read_list(struct policydb *p, void *fp)
{
	struct cond_node *node, *last = NULL;
	__le32 buf[1];
	u32 i, len;
	int rc;

	rc = next_entry(buf, fp, sizeof buf);
	if (rc)
		return rc;

	len = le32_to_cpu(buf[0]);

	rc = avtab_alloc(&(p->te_cond_avtab), p->te_avtab.nel);
	if (rc)
		goto err;

	for (i = 0; i < len; i++) {
		rc = -ENOMEM;
		node = kzalloc(sizeof(struct cond_node), GFP_KERNEL);
		if (!node)
			goto err;

		rc = cond_read_node(p, node, fp);
		if (rc)
			goto err;

		if (i == 0)
			p->cond_list = node;
		else
			last->next = node;
		last = node;
	}
	return 0;
err:
	cond_list_destroy(p->cond_list);
	p->cond_list = NULL;
	return rc;
}

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12.82%
1
14.29%
Stephen D. Smalley
17
8.72%
2
28.57%
Dan Carpenter
13
6.67%
1
14.29%
Alexey Dobriyan
3
1.54%
1
14.29%
James Morris
1
0.51%
1
14.29%
Total
195
100.00%
7
100.00%



int cond_write_bool(void *vkey, void *datum, void *ptr)
{
	char *key = vkey;
	struct cond_bool_datum *booldatum = datum;
	struct policy_data *pd = ptr;
	void *fp = pd->fp;
	__le32 buf[3];
	u32 len;
	int rc;

	len = strlen(key);
	buf[0] = cpu_to_le32(booldatum->value);
	buf[1] = cpu_to_le32(booldatum->state);
	buf[2] = cpu_to_le32(len);
	rc = put_entry(buf, sizeof(u32), 3, fp);
	if (rc)
		return rc;
	rc = put_entry(key, 1, len, fp);
	if (rc)
		return rc;
	return 0;
}

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/*
 * cond_write_cond_av_list doesn't write out the av_list nodes.
 * Instead it writes out the key/value pairs from the avtab. This
 * is necessary because there is no way to uniquely identifying rules
 * in the avtab so it is not possible to associate individual rules
 * in the avtab with a conditional without saving them as part of
 * the conditional. This means that the avtab with the conditional
 * rules will not be saved but will be rebuilt on policy load.
 */


static int cond_write_av_list(struct policydb *p,
			      struct cond_av_list *list, struct policy_file *fp)
{
	__le32 buf[1];
	struct cond_av_list *cur_list;
	u32 len;
	int rc;

	len = 0;
	for (cur_list = list; cur_list != NULL; cur_list = cur_list->next)
		len++;

	buf[0] = cpu_to_le32(len);
	rc = put_entry(buf, sizeof(u32), 1, fp);
	if (rc)
		return rc;

	if (len == 0)
		return 0;

	for (cur_list = list; cur_list != NULL; cur_list = cur_list->next) {
		rc = avtab_write_item(p, cur_list->node, fp);
		if (rc)
			return rc;
	}

	return 0;
}

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1
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static int cond_write_node(struct policydb *p, struct cond_node *node,
		    struct policy_file *fp)
{
	struct cond_expr *cur_expr;
	__le32 buf[2];
	int rc;
	u32 len = 0;

	buf[0] = cpu_to_le32(node->cur_state);
	rc = put_entry(buf, sizeof(u32), 1, fp);
	if (rc)
		return rc;

	for (cur_expr = node->expr; cur_expr != NULL; cur_expr = cur_expr->next)
		len++;

	buf[0] = cpu_to_le32(len);
	rc = put_entry(buf, sizeof(u32), 1, fp);
	if (rc)
		return rc;

	for (cur_expr = node->expr; cur_expr != NULL; cur_expr = cur_expr->next) {
		buf[0] = cpu_to_le32(cur_expr->expr_type);
		buf[1] = cpu_to_le32(cur_expr->bool);
		rc = put_entry(buf, sizeof(u32), 2, fp);
		if (rc)
			return rc;
	}

	rc = cond_write_av_list(p, node->true_list, fp);
	if (rc)
		return rc;
	rc = cond_write_av_list(p, node->false_list, fp);
	if (rc)
		return rc;

	return 0;
}

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int cond_write_list(struct policydb *p, struct cond_node *list, void *fp)
{
	struct cond_node *cur;
	u32 len;
	__le32 buf[1];
	int rc;

	len = 0;
	for (cur = list; cur != NULL; cur = cur->next)
		len++;
	buf[0] = cpu_to_le32(len);
	rc = put_entry(buf, sizeof(u32), 1, fp);
	if (rc)
		return rc;

	for (cur = list; cur != NULL; cur = cur->next) {
		rc = cond_write_node(p, cur, fp);
		if (rc)
			return rc;
	}

	return 0;
}

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1
100.00%



void cond_compute_xperms(struct avtab *ctab, struct avtab_key *key,
		struct extended_perms_decision *xpermd)
{
	struct avtab_node *node;

	if (!ctab || !key || !xpermd)
		return;

	for (node = avtab_search_node(ctab, key); node;
			node = avtab_search_node_next(node, key->specified)) {
		if (node->key.specified & AVTAB_ENABLED)
			services_compute_xperms_decision(xpermd, node);
	}
	return;

}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Jeff Vander Stoep
81
100.00%
1
100.00%
Total
81
100.00%
1
100.00%

/* Determine whether additional permissions are granted by the conditional
 * av table, and if so, add them to the result
 */


void cond_compute_av(struct avtab *ctab, struct avtab_key *key,
		struct av_decision *avd, struct extended_perms *xperms)
{
	struct avtab_node *node;

	if (!ctab || !key || !avd)
		return;

	for (node = avtab_search_node(ctab, key); node;
				node = avtab_search_node_next(node, key->specified)) {
		if ((u16)(AVTAB_ALLOWED|AVTAB_ENABLED) ==
		    (node->key.specified & (AVTAB_ALLOWED|AVTAB_ENABLED)))
			avd->allowed |= node->datum.u.data;
		if ((u16)(AVTAB_AUDITDENY|AVTAB_ENABLED) ==
		    (node->key.specified & (AVTAB_AUDITDENY|AVTAB_ENABLED)))
			/* Since a '0' in an auditdeny mask represents a
                         * permission we do NOT want to audit (dontaudit), we use
                         * the '&' operand to ensure that all '0's in the mask
                         * are retained (much unlike the allow and auditallow cases).
                         */
			avd->auditdeny &= node->datum.u.data;
		if ((u16)(AVTAB_AUDITALLOW|AVTAB_ENABLED) ==
		    (node->key.specified & (AVTAB_AUDITALLOW|AVTAB_ENABLED)))
			avd->auditallow |= node->datum.u.data;
		if (xperms && (node->key.specified & AVTAB_ENABLED) &&
				(node->key.specified & AVTAB_XPERMS))
			services_compute_xperms_drivers(xperms, node);
	}
	return;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Andrew Morton
155
73.11%
1
25.00%
Jeff Vander Stoep
40
18.87%
1
25.00%
Stephen D. Smalley
17
8.02%
2
50.00%
Total
212
100.00%
4
100.00%

Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Andrew Morton
1904
59.09%
1
3.57%
Eric Paris
695
21.57%
4
14.29%
Stephen D. Smalley
328
10.18%
5
17.86%
Jeff Vander Stoep
124
3.85%
1
3.57%
Dan Carpenter
84
2.61%
5
17.86%
Yuichi Nakamura
25
0.78%
1
3.57%
William Roberts
23
0.71%
1
3.57%
Alexey Dobriyan
12
0.37%
1
3.57%
James Morris
10
0.31%
3
10.71%
Alexander Nyberg
7
0.22%
1
3.57%
Namhyung Kim
6
0.19%
2
7.14%
Chris Wright
2
0.06%
1
3.57%
Davidlohr Bueso A
1
0.03%
1
3.57%
Vesa-Matti J Kari
1
0.03%
1
3.57%
Total
3222
100.00%
28
100.00%
Directory: security/selinux/ss

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