Release 4.7 security/min_addr.c

#include <linux/init.h>
#include <linux/mm.h>
#include <linux/security.h>
#include <linux/sysctl.h>

/* amount of vm to protect from userspace access by both DAC and the LSM*/

unsigned long mmap_min_addr;
/* amount of vm to protect from userspace using CAP_SYS_RAWIO (DAC) */

unsigned long dac_mmap_min_addr = CONFIG_DEFAULT_MMAP_MIN_ADDR;
/* amount of vm to protect from userspace using the LSM = CONFIG_LSM_MMAP_MIN_ADDR */

/*
 * Update mmap_min_addr = max(dac_mmap_min_addr, CONFIG_LSM_MMAP_MIN_ADDR)
 */


static void update_mmap_min_addr(void)
{
#ifdef CONFIG_LSM_MMAP_MIN_ADDR
	if (dac_mmap_min_addr > CONFIG_LSM_MMAP_MIN_ADDR)
		mmap_min_addr = dac_mmap_min_addr;
	else
		mmap_min_addr = CONFIG_LSM_MMAP_MIN_ADDR;
#else
	mmap_min_addr = dac_mmap_min_addr;
#endif
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
eric paris
eric paris
34
100.00%
1
100.00%
Total
34
100.00%
1
100.00%

/*
 * sysctl handler which just sets dac_mmap_min_addr = the new value and then
 * calls update_mmap_min_addr() so non MAP_FIXED hints get rounded properly
 */


int mmap_min_addr_handler(struct ctl_table *table, int write,
			  void __user *buffer, size_t *lenp, loff_t *ppos)
{
	int ret;

	if (write && !capable(CAP_SYS_RAWIO))
		return -EPERM;

	ret = proc_doulongvec_minmax(table, write, buffer, lenp, ppos);

	update_mmap_min_addr();

	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
eric paris
eric paris
50
78.12%
1
33.33%
kees cook
kees cook
14
21.88%
2
66.67%
Total
64
100.00%
3
100.00%



static int __init init_mmap_min_addr(void)
{
	update_mmap_min_addr();

	return 0;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
eric paris
eric paris
14
93.33%
1
50.00%
h hartley sweeten
h hartley sweeten
1
6.67%
1
50.00%
Total
15
100.00%
2
100.00%


pure_initcall(init_mmap_min_addr);
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
eric paris
eric paris
130
89.66%
1
25.00%
kees cook
kees cook
14
9.66%
2
50.00%
h hartley sweeten
h hartley sweeten
1
0.69%
1
25.00%
Total
145
100.00%
4
100.00%
  
Directory: security

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.