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- #include <linux/init.h>
- #include <linux/mm.h>
- #include <linux/security.h>
- #include <linux/sysctl.h>
- unsigned long mmap_min_addr;
- unsigned long dac_mmap_min_addr = CONFIG_DEFAULT_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
- }
- 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;
- }
- static int __init init_mmap_min_addr(void)
- {
- update_mmap_min_addr();
- return 0;
- }
- pure_initcall(init_mmap_min_addr);
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