From 502f660466ba7a66711ffdf414b1f7f1131dcbf7 Mon Sep 17 00:00:00 2001 From: Suresh Siddha Date: Wed, 28 Oct 2009 18:46:56 -0800 Subject: x86, cpa: Fix kernel text RO checks in static_protection() Steven Rostedt reported that we are unconditionally making the kernel text mapping as read-only. i.e., if someone does cpa() to the kernel text area for setting/clearing any page table attribute, we unconditionally clear the read-write attribute for the kernel text mapping that is set at compile time. We should delay (to forbid the write attribute) and enforce only after the kernel has mapped the text as read-only. Reported-by: Steven Rostedt Signed-off-by: Suresh Siddha Acked-by: Steven Rostedt Tested-by: Steven Rostedt LKML-Reference: <20091029024820.996634347@sbs-t61.sc.intel.com> [ marked kernel_set_to_readonly as __read_mostly ] Signed-off-by: Ingo Molnar --- arch/x86/include/asm/cacheflush.h | 1 + 1 file changed, 1 insertion(+) (limited to 'arch/x86/include/asm/cacheflush.h') diff --git a/arch/x86/include/asm/cacheflush.h b/arch/x86/include/asm/cacheflush.h index b54f6afe7ec4..eebb2cd2b9bf 100644 --- a/arch/x86/include/asm/cacheflush.h +++ b/arch/x86/include/asm/cacheflush.h @@ -176,6 +176,7 @@ void clflush_cache_range(void *addr, unsigned int size); #ifdef CONFIG_DEBUG_RODATA void mark_rodata_ro(void); extern const int rodata_test_data; +extern int kernel_set_to_readonly; void set_kernel_text_rw(void); void set_kernel_text_ro(void); #else -- cgit v1.2.2