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Linux/security/min_addr.c

  1 #include <linux/init.h>
  2 #include <linux/mm.h>
  3 #include <linux/security.h>
  4 #include <linux/sysctl.h>
  5 
  6 /* amount of vm to protect from userspace access by both DAC and the LSM*/
  7 unsigned long mmap_min_addr;
  8 /* amount of vm to protect from userspace using CAP_SYS_RAWIO (DAC) */
  9 unsigned long dac_mmap_min_addr = CONFIG_DEFAULT_MMAP_MIN_ADDR;
 10 /* amount of vm to protect from userspace using the LSM = CONFIG_LSM_MMAP_MIN_ADDR */
 11 
 12 /*
 13  * Update mmap_min_addr = max(dac_mmap_min_addr, CONFIG_LSM_MMAP_MIN_ADDR)
 14  */
 15 static void update_mmap_min_addr(void)
 16 {
 17 #ifdef CONFIG_LSM_MMAP_MIN_ADDR
 18         if (dac_mmap_min_addr > CONFIG_LSM_MMAP_MIN_ADDR)
 19                 mmap_min_addr = dac_mmap_min_addr;
 20         else
 21                 mmap_min_addr = CONFIG_LSM_MMAP_MIN_ADDR;
 22 #else
 23         mmap_min_addr = dac_mmap_min_addr;
 24 #endif
 25 }
 26 
 27 /*
 28  * sysctl handler which just sets dac_mmap_min_addr = the new value and then
 29  * calls update_mmap_min_addr() so non MAP_FIXED hints get rounded properly
 30  */
 31 int mmap_min_addr_handler(struct ctl_table *table, int write,
 32                           void __user *buffer, size_t *lenp, loff_t *ppos)
 33 {
 34         int ret;
 35 
 36         if (write && !capable(CAP_SYS_RAWIO))
 37                 return -EPERM;
 38 
 39         ret = proc_doulongvec_minmax(table, write, buffer, lenp, ppos);
 40 
 41         update_mmap_min_addr();
 42 
 43         return ret;
 44 }
 45 
 46 static int __init init_mmap_min_addr(void)
 47 {
 48         update_mmap_min_addr();
 49 
 50         return 0;
 51 }
 52 pure_initcall(init_mmap_min_addr);
 53 

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