linux-kernel - [RFC PATCH 1/2] kpatch: add TAINT

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Message-Id: <ba6ea704e4ba2b1cdd2422873b8d217f7a2619d8.1398958771.git.jpoimboe@redhat.com>
Date:	Thu,  1 May 2014 10:52:05 -0500
From:	Josh Poimboeuf <jpoimboe@...hat.com>
To:	Josh Poimboeuf <jpoimboe@...hat.com>,
	Seth Jennings <sjenning@...hat.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>, Jiri Slaby <jslaby@...e.cz>
Cc:	linux-kernel@...r.kernel.org
Subject: [RFC PATCH 1/2] kpatch: add TAINT_KPATCH flag

Add a TAINT_KPATCH flag to be set whenever a kpatch patch module
successfully replaces a function.

Signed-off-by: Josh Poimboeuf <jpoimboe@...hat.com>
Cc: Seth Jennings <sjenning@...hat.com>
---
 Documentation/oops-tracing.txt  | 3 +++
 Documentation/sysctl/kernel.txt | 1 +
 include/linux/kernel.h          | 1 +
 kernel/panic.c                  | 2 ++
 4 files changed, 7 insertions(+)

diff --git a/Documentation/oops-tracing.txt b/Documentation/oops-tracing.txt
index e315599..2ed7ed1 100644
--- a/Documentation/oops-tracing.txt
+++ b/Documentation/oops-tracing.txt
@@ -268,6 +268,9 @@ characters, each representing a particular tainted value.
  14: 'E' if an unsigned module has been loaded in a kernel supporting
      module signature.
 
+ 15: 'H' if a kpatch hot patch module has replaced any functions in the
+     running kernel.
+
 The primary reason for the 'Tainted: ' string is to tell kernel
 debuggers if this is a clean kernel or if anything unusual has
 occurred.  Tainting is permanent: even if an offending module is
diff --git a/Documentation/sysctl/kernel.txt b/Documentation/sysctl/kernel.txt
index 9886c3d..7d31b1e 100644
--- a/Documentation/sysctl/kernel.txt
+++ b/Documentation/sysctl/kernel.txt
@@ -788,6 +788,7 @@ can be ORed together:
 4096 - An out-of-tree module has been loaded.
 8192 - An unsigned module has been loaded in a kernel supporting module
        signature.
+16384 - A kpatch module has replaced a function in the running kernel.
 
 ==============================================================
 
diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index 4c52907..cdfbe73 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -470,6 +470,7 @@ extern enum system_states {
 #define TAINT_FIRMWARE_WORKAROUND	11
 #define TAINT_OOT_MODULE		12
 #define TAINT_UNSIGNED_MODULE		13
+#define TAINT_KPATCH			14
 
 extern const char hex_asc[];
 #define hex_asc_lo(x)	hex_asc[((x) & 0x0f)]
diff --git a/kernel/panic.c b/kernel/panic.c
index d02fa9f..2c04a88 100644
--- a/kernel/panic.c
+++ b/kernel/panic.c
@@ -212,6 +212,7 @@ static const struct tnt tnts[] = {
 	{ TAINT_FIRMWARE_WORKAROUND,	'I', ' ' },
 	{ TAINT_OOT_MODULE,		'O', ' ' },
 	{ TAINT_UNSIGNED_MODULE,	'E', ' ' },
+	{ TAINT_KPATCH,			'H', ' ' },
 };
 
 /**
@@ -231,6 +232,7 @@ static const struct tnt tnts[] = {
  *  'I' - Working around severe firmware bug.
  *  'O' - Out-of-tree module has been loaded.
  *  'E' - Unsigned module has been loaded.
+ *  'H' - kpatch replaced a function.
  *
  *	The string is overwritten by the next call to print_tainted().
  */
-- 
1.9.0

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