[ARM] add address randomization to mmap() (cc92c28b) · Commits · e / devices / android_kernel_oneplus_sm7250

arch/arm/mm/mmap.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -7,6 +7,7 @@
		#include <linux/shm.h>
		#include <linux/sched.h>
		#include <linux/io.h>
		#include <linux/random.h>
		#include <asm/cputype.h>
		#include <asm/system.h>

		@@ -80,6 +81,9 @@ arch_get_unmapped_area(struct file *filp, unsigned long addr,
		start_addr = addr = TASK_UNMAPPED_BASE;
		mm->cached_hole_size = 0;
		}
		/* 8 bits of randomness in 20 address space bits */
		if (current->flags & PF_RANDOMIZE)
		addr += (get_random_int() % (1 << 8)) << PAGE_SHIFT;

		full_search:
		if (do_align)