Re: [RFC PATCH v2 12/27] x86/mm: Shadow stack page fault error checking
From: Dave Hansen <dave.hansen@linux.intel.com>
Date: 2018-07-10 22:52:59
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linux-arch, linux-doc, linux-mm, lkml
On 07/10/2018 03:26 PM, Yu-cheng Yu wrote:
quoted hunk ↗ jump to hunk
+++ b/arch/x86/include/asm/traps.h@@ -157,6 +157,7 @@ enum { * bit 3 == 1: use of reserved bit detected * bit 4 == 1: fault was an instruction fetch * bit 5 == 1: protection keys block access + * bit 6 == 1: shadow stack access fault */
Could we document this bit better? Is this a fault where the *processor* thought it should be a shadow stack fault? Or is it also set on faults to valid shadow stack PTEs that just happen to fault for other reasons, say protection keys?