Signed-off-by: Jason Wessel <[email protected]>
x86_64-no_context_hook.patch
From: Jason Wessel <[email protected]>
CC: [email protected]
Subject: [PATCH] This adds a call to notify_die()
A call to notify_die is added in the "no context" portion of
do_page_fault() as someone on the chain might care and want to do a
fixup.
Signed-off-by: Tom Rini <[email protected]>
Signed-off-by: Jason Wessel <[email protected]>
---
arch/x86/mm/fault_64.c | 4 ++++
include/asm-x86/kdebug_64.h | 1 +
2 files changed, 5 insertions(+)
--- a/arch/x86/mm/fault_64.c
+++ b/arch/x86/mm/fault_64.c
@@ -531,6 +531,10 @@ no_context:
if (is_errata93(regs, address))
return;
+ if (notify_die(DIE_PAGE_FAULT_NO_CONTEXT, "no context", regs,
+ error_code, 14, SIGSEGV) == NOTIFY_STOP)
+ return;
+
/*
* Oops. The kernel tried to access some bad page. We'll have to
* terminate things with extreme prejudice.
--- a/include/asm-x86/kdebug_64.h
+++ b/include/asm-x86/kdebug_64.h
@@ -23,6 +23,7 @@ enum die_val {
DIE_CALL,
DIE_NMI_IPI,
DIE_PAGE_FAULT,
+ DIE_PAGE_FAULT_NO_CONTEXT,
};
extern void printk_address(unsigned long address);
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