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[PATCH] i386/x86-64: Don't randomize stack top when no randomization personality is set

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Based on patch from Frank van Maarseveen <frankvm@frankvm.com>, but
extended.

Signed-off-by: Andi Kleen <ak@suse.de>
This commit is contained in:
Andi Kleen 2006-09-26 10:52:28 +02:00 committed by Andi Kleen
parent d5d9ca6d88
commit c16b63e09d
3 changed files with 5 additions and 3 deletions
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3
arch/i386/kernel/process.c
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@ -37,6 +37,7 @@
#include <linux/kallsyms.h>
#include <linux/ptrace.h>
#include <linux/random.h>
#include <linux/personality.h>
#include <asm/uaccess.h>
#include <asm/pgtable.h>
@ -905,7 +906,7 @@ asmlinkage int sys_get_thread_area(struct user_desc __user *u_info)
unsigned long arch_align_stack(unsigned long sp)
{
if (randomize_va_space)
if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space)
sp -= get_random_int() % 8192;
return sp & ~0xf;
}

2
arch/x86_64/kernel/process.c
View file

@ -845,7 +845,7 @@ int dump_task_regs(struct task_struct *tsk, elf_gregset_t *regs)
unsigned long arch_align_stack(unsigned long sp)
{
if (randomize_va_space)
if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space)
sp -= get_random_int() % 8192;
return sp & ~0xf;
}

3
fs/binfmt_elf.c
View file

@ -515,7 +515,8 @@ static unsigned long randomize_stack_top(unsigned long stack_top)
{
unsigned int random_variable = 0;
if (current->flags & PF_RANDOMIZE) {
if ((current->flags & PF_RANDOMIZE) &&
!(current->personality & ADDR_NO_RANDOMIZE)) {
random_variable = get_random_int() & STACK_RND_MASK;
random_variable <<= PAGE_SHIFT;
}