linux-kernel - [PATCH] fix modules oopsing in lguest guests

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Message-Id: <1190613424.27805.181.camel@localhost.localdomain>
Date:	Mon, 24 Sep 2007 15:57:04 +1000
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	lguest <lguest@...abs.org>,
	lkml - Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [PATCH] fix modules oopsing in lguest guests

The assembly templates for lguest guest patching are in the .init.text
section.  This means that modules get patched with "cc cc cc cc" or
similar junk.

Signed-off-by: Rusty Russell <rusty@...tcorp.com.au>

diff -r 554f72e059aa drivers/lguest/lguest_asm.S
--- a/drivers/lguest/lguest_asm.S	Thu Sep 13 16:56:44 2007 +1000
+++ b/drivers/lguest/lguest_asm.S	Mon Sep 24 15:34:31 2007 +1000
@@ -22,8 +22,9 @@
 	jmp lguest_init
 
 /*G:055 We create a macro which puts the assembler code between lgstart_ and
- * lgend_ markers.  These templates end up in the .init.text section, so they
- * are discarded after boot. */
+ * lgend_ markers.  These templates are put in the .text section: they can't be
+ * discarded after boot as we may need to patch modules, too. */
+.text
 #define LGUEST_PATCH(name, insns...)			\
 	lgstart_##name:	insns; lgend_##name:;		\
 	.globl lgstart_##name; .globl lgend_##name
@@ -34,7 +35,6 @@ LGUEST_PATCH(pushf, movl lguest_data+LGU
 LGUEST_PATCH(pushf, movl lguest_data+LGUEST_DATA_irq_enabled, %eax)
 /*:*/
 
-.text
 /* These demark the EIP range where host should never deliver interrupts. */
 .global lguest_noirq_start
 .global lguest_noirq_end


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