[PATCH 3.2 137/152] Revert "x86, 64bit, mm: Mark data/bss/brk to nx"

Ben Hutchings
2015-02-17T01:46:53Z

From: Ben Hutchings <ben@decadent.org.uk>

This reverts commit e105c8187b7101e8a8a54ac0218c9d9c9463c636 which
was commit 72212675d1c96f5db8ec6fb35701879911193158 upstream.

This caused suspend/resume to stop working on at least some systems -
specifically, the system would reboot when woken.

Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Cc: Steven Rostedt <rostedt@goodmis.org>
---
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -778,7 +778,6 @@ void mark_rodata_ro(void)
unsigned long text_end = PAGE_ALIGN((unsigned long) &__stop___ex_table);
unsigned long rodata_end = PAGE_ALIGN((unsigned long) &__end_rodata);
unsigned long data_start = (unsigned long) &_sdata;
- unsigned long all_end = PFN_ALIGN(&_end);

printk(KERN_INFO "Write protecting the kernel read-only data: %luk\n",
(end - start) >> 10);
@@ -787,10 +786,10 @@ void mark_rodata_ro(void)
kernel_set_to_readonly = 1;

/*
- * The rodata/data/bss/brk section (but not the kernel text!)
- * should also be not-executable.
+ * The rodata section (but not the kernel text!) should also be
+ * not-executable.
*/
- set_memory_nx(rodata_start, (all_end - rodata_start) >> PAGE_SHIFT);
+ set_memory_nx(rodata_start, (end - rodata_start) >> PAGE_SHIFT);

rodata_test();