Contributors: 21
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Eric Paris |
87 |
44.85% |
1 |
3.45% |
| Linus Torvalds (pre-git) |
21 |
10.82% |
5 |
17.24% |
| Christoph Hellwig |
20 |
10.31% |
1 |
3.45% |
| Kees Cook |
14 |
7.22% |
2 |
6.90% |
| Kaixiong Yu |
13 |
6.70% |
1 |
3.45% |
| David Howells |
5 |
2.58% |
1 |
3.45% |
| Hideaki Yoshifuji / 吉藤英明 |
5 |
2.58% |
1 |
3.45% |
| Linus Torvalds |
4 |
2.06% |
1 |
3.45% |
| Greg Kroah-Hartman |
4 |
2.06% |
2 |
6.90% |
| Joel Granados |
4 |
2.06% |
3 |
10.34% |
| Paul Mundt |
3 |
1.55% |
1 |
3.45% |
| Christoph Lameter |
3 |
1.55% |
1 |
3.45% |
| Kazuto Miyoshi |
2 |
1.03% |
1 |
3.45% |
| Mimi Zohar |
2 |
1.03% |
1 |
3.45% |
| Eric Dumazet |
1 |
0.52% |
1 |
3.45% |
| Luis R. Rodriguez |
1 |
0.52% |
1 |
3.45% |
| Nicholas Piggin |
1 |
0.52% |
1 |
3.45% |
| H Hartley Sweeten |
1 |
0.52% |
1 |
3.45% |
| Francesco Fusco |
1 |
0.52% |
1 |
3.45% |
| Andi Kleen |
1 |
0.52% |
1 |
3.45% |
| Eric W. Biedermann |
1 |
0.52% |
1 |
3.45% |
| Total |
194 |
|
29 |
|
// SPDX-License-Identifier: GPL-2.0
#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
}
/*
* 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(const struct ctl_table *table, int write,
void *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;
}
static const struct ctl_table min_addr_sysctl_table[] = {
{
.procname = "mmap_min_addr",
.data = &dac_mmap_min_addr,
.maxlen = sizeof(unsigned long),
.mode = 0644,
.proc_handler = mmap_min_addr_handler,
},
};
static int __init init_mmap_min_addr(void)
{
register_sysctl_init("vm", min_addr_sysctl_table);
update_mmap_min_addr();
return 0;
}
pure_initcall(init_mmap_min_addr);