Attachment 304135 Details for Bug 444611 – Disable stack alignment randomization for ADDR_NO_RANDOMIZE processes

[patch] Disable stack alignment randomization for ADDR_NO_RANDOMIZE processes

no-stack-randomize.el5.patch (text/plain), 1.84 KB, created by Bryn M. Reeves on 2008-04-29 16:00:04 UTC

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Creator: Bryn M. Reeves

Created: 2008-04-29 16:00:04 UTC

Size: 1.84 KB

patch

obsolete

>diff -up linux-2.6.18/arch/i386/kernel/process.c.no-stack-randomize linux-2.6.18/arch/i386/kernel/process.c
>--- linux-2.6.18/arch/i386/kernel/process.c.no-stack-randomize	2008-04-29 16:57:27.000000000 +0100
>+++ linux-2.6.18/arch/i386/kernel/process.c	2008-04-29 16:57:52.000000000 +0100
>@@ -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>
>@@ -899,7 +900,7 @@ asmlinkage int sys_get_thread_area(struc
> 
> 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;
> }
>diff -up linux-2.6.18/arch/x86_64/kernel/process.c.no-stack-randomize linux-2.6.18/arch/x86_64/kernel/process.c
>--- linux-2.6.18/arch/x86_64/kernel/process.c.no-stack-randomize	2008-04-29 16:57:38.000000000 +0100
>+++ linux-2.6.18/arch/x86_64/kernel/process.c	2008-04-29 16:57:52.000000000 +0100
>@@ -825,7 +825,7 @@ int dump_task_regs(struct task_struct *t
> 
> 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;
> }
>diff -up linux-2.6.18/fs/binfmt_elf.c.no-stack-randomize linux-2.6.18/fs/binfmt_elf.c
>--- linux-2.6.18/fs/binfmt_elf.c.no-stack-randomize	2008-04-29 16:57:49.000000000 +0100
>+++ linux-2.6.18/fs/binfmt_elf.c	2008-04-29 16:57:52.000000000 +0100
>@@ -563,7 +563,8 @@ static unsigned long randomize_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;
> 	}

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Attachments on bug 444611: 304126 | 304135