linux-kernel - [PATCH v2] livepatch: x86: bugfix about kASLR

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Date:	Fri, 6 Nov 2015 14:25:00 +0800
From:	Zhou Chengming <zhouchengming1@...wei.com>
To:	<jpoimboe@...hat.com>, <sjenning@...hat.com>, <jkosina@...e.cz>,
	<vojtech@...e.cz>
CC:	<live-patching@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<guohanjun@...wei.com>, <huawei.libin@...wei.com>,
	<xiexiuqi@...wei.com>, <cbay@...aysdata.com>,
	<zhouchengming1@...wei.com>
Subject: [PATCH v2] livepatch: x86: bugfix about kASLR

When enable KASLR, livepatch will adjust old_addr of changed
function accordingly. So do the same thing for reloc.

[PATCH v1] https://lkml.org/lkml/2015/11/4/91

Reported-by: Cyril B. <cbay@...aysdata.com>
Signed-off-by: Zhou Chengming <zhouchengming1@...wei.com>
---
 kernel/livepatch/core.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/kernel/livepatch/core.c b/kernel/livepatch/core.c
index 6e53441..db545cb 100644
--- a/kernel/livepatch/core.c
+++ b/kernel/livepatch/core.c
@@ -294,6 +294,12 @@ static int klp_write_object_relocations(struct module *pmod,
 
 	for (reloc = obj->relocs; reloc->name; reloc++) {
 		if (!klp_is_module(obj)) {
+
+#if defined(CONFIG_RANDOMIZE_BASE)
+			/* If KASLR has been enabled, adjust old value accordingly */
+			if (kaslr_enabled())
+				reloc->val += kaslr_offset();
+#endif
 			ret = klp_verify_vmlinux_symbol(reloc->name,
 							reloc->val);
 			if (ret)
-- 
1.7.7

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