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authorSuresh Siddha <suresh.b.siddha@intel.com>2009-10-28 18:46:56 -0800
committerIngo Molnar <mingo@elte.hu>2009-11-02 17:16:35 +0100
commit502f660466ba7a66711ffdf414b1f7f1131dcbf7 (patch)
tree9b5ac4309f392855108365d3d17406ce3199d2eb /arch/x86/mm/init_64.c
parent883242dd0e5faaba041528a9a99f483f2a656c83 (diff)
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 <rostedt@goodmis.org> Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com> Acked-by: Steven Rostedt <rostedt@goodmis.org> Tested-by: Steven Rostedt <rostedt@goodmis.org> LKML-Reference: <20091029024820.996634347@sbs-t61.sc.intel.com> [ marked kernel_set_to_readonly as __read_mostly ] Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/mm/init_64.c')
-rw-r--r--arch/x86/mm/init_64.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index 0ed09fad6aa..4b507c08940 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -695,7 +695,7 @@ void __init mem_init(void)
const int rodata_test_data = 0xC3;
EXPORT_SYMBOL_GPL(rodata_test_data);
-static int kernel_set_to_readonly;
+int kernel_set_to_readonly;
void set_kernel_text_rw(void)
{