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-rw-r--r--arch/mips/kernel/syscall.c61
1 files changed, 56 insertions, 5 deletions
diff --git a/arch/mips/kernel/syscall.c b/arch/mips/kernel/syscall.c
index dd81b0f..1dc6edf 100644
--- a/arch/mips/kernel/syscall.c
+++ b/arch/mips/kernel/syscall.c
@@ -29,6 +29,8 @@
#include <linux/ipc.h>
#include <linux/uaccess.h>
#include <linux/slab.h>
+#include <linux/random.h>
+#include <linux/elf.h>
#include <asm/asm.h>
#include <asm/branch.h>
@@ -116,7 +118,7 @@ unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
(!vmm || addr + len <= vmm->vm_start))
return addr;
}
- addr = TASK_UNMAPPED_BASE;
+ addr = current->mm->mmap_base;
if (do_color_align)
addr = COLOUR_ALIGN(addr, pgoff);
else
@@ -134,6 +136,51 @@ unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
}
}
+void arch_pick_mmap_layout(struct mm_struct *mm)
+{
+ unsigned long random_factor = 0UL;
+
+ if (current->flags & PF_RANDOMIZE) {
+ random_factor = get_random_int();
+ random_factor = random_factor << PAGE_SHIFT;
+ if (TASK_IS_32BIT_ADDR)
+ random_factor &= 0xfffffful;
+ else
+ random_factor &= 0xffffffful;
+ }
+
+ mm->mmap_base = TASK_UNMAPPED_BASE + random_factor;
+ mm->get_unmapped_area = arch_get_unmapped_area;
+ mm->unmap_area = arch_unmap_area;
+}
+
+static inline unsigned long brk_rnd(void)
+{
+ unsigned long rnd = get_random_int();
+
+ rnd = rnd << PAGE_SHIFT;
+ /* 8MB for 32bit, 256MB for 64bit */
+ if (TASK_IS_32BIT_ADDR)
+ rnd = rnd & 0x7ffffful;
+ else
+ rnd = rnd & 0xffffffful;
+
+ return rnd;
+}
+
+unsigned long arch_randomize_brk(struct mm_struct *mm)
+{
+ unsigned long base = mm->brk;
+ unsigned long ret;
+
+ ret = PAGE_ALIGN(base + brk_rnd());
+
+ if (ret < mm->brk)
+ return mm->brk;
+
+ return ret;
+}
+
SYSCALL_DEFINE6(mips_mmap, unsigned long, addr, unsigned long, len,
unsigned long, prot, unsigned long, flags, unsigned long,
fd, off_t, offset)
@@ -207,12 +254,14 @@ asmlinkage int sys_execve(nabi_no_regargs struct pt_regs regs)
int error;
char * filename;
- filename = getname((char __user *) (long)regs.regs[4]);
+ filename = getname((const char __user *) (long)regs.regs[4]);
error = PTR_ERR(filename);
if (IS_ERR(filename))
goto out;
- error = do_execve(filename, (char __user *__user *) (long)regs.regs[5],
- (char __user *__user *) (long)regs.regs[6], &regs);
+ error = do_execve(filename,
+ (const char __user *const __user *) (long)regs.regs[5],
+ (const char __user *const __user *) (long)regs.regs[6],
+ &regs);
putname(filename);
out:
@@ -389,7 +438,9 @@ asmlinkage void bad_stack(void)
* Do a system call from kernel instead of calling sys_execve so we
* end up with proper pt_regs.
*/
-int kernel_execve(const char *filename, char *const argv[], char *const envp[])
+int kernel_execve(const char *filename,
+ const char *const argv[],
+ const char *const envp[])
{
register unsigned long __a0 asm("$4") = (unsigned long) filename;
register unsigned long __a1 asm("$5") = (unsigned long) argv;
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