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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/Kconfig
parent883242dd0e5faaba041528a9a99f483f2a656c83 (diff)
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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>
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