linux-kernel - [PATCH 1/3] taint: Convert to enum and indexed initialization

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Date:   Thu, 15 Feb 2018 19:37:42 -0800
From:   Kees Cook <keescook@...omium.org>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Kees Cook <keescook@...omium.org>,
        Al Viro <viro@...iv.linux.org.uk>,
        Alexey Dobriyan <adobriyan@...il.com>,
        Jonathan Corbet <corbet@....net>, linux-kernel@...r.kernel.org,
        linux-doc@...r.kernel.org
Subject: [PATCH 1/3] taint: Convert to enum and indexed initialization

This converts the taint bit defines to an enum, uses indexed initializers
instead of comments, and make sure that no one forgets to update the
taint_flags when adding new bits.

Signed-off-by: Kees Cook <keescook@...omium.org>
---
 include/linux/kernel.h | 40 ++++++++++++++++++++++------------------
 kernel/panic.c         | 36 +++++++++++++++++++-----------------
 2 files changed, 41 insertions(+), 35 deletions(-)

diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index ce51455e2adf..0d2a2dd507b7 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -533,24 +533,28 @@ extern enum system_states {
 	SYSTEM_RESTART,
 } system_state;
 
-#define TAINT_PROPRIETARY_MODULE	0
-#define TAINT_FORCED_MODULE		1
-#define TAINT_CPU_OUT_OF_SPEC		2
-#define TAINT_FORCED_RMMOD		3
-#define TAINT_MACHINE_CHECK		4
-#define TAINT_BAD_PAGE			5
-#define TAINT_USER			6
-#define TAINT_DIE			7
-#define TAINT_OVERRIDDEN_ACPI_TABLE	8
-#define TAINT_WARN			9
-#define TAINT_CRAP			10
-#define TAINT_FIRMWARE_WORKAROUND	11
-#define TAINT_OOT_MODULE		12
-#define TAINT_UNSIGNED_MODULE		13
-#define TAINT_SOFTLOCKUP		14
-#define TAINT_LIVEPATCH			15
-#define TAINT_AUX			16
-#define TAINT_FLAGS_COUNT		17
+enum taint_enum {
+	TAINT_PROPRIETARY_MODULE = 0,
+	TAINT_FORCED_MODULE,
+	TAINT_CPU_OUT_OF_SPEC,
+	TAINT_FORCED_RMMOD,
+	TAINT_MACHINE_CHECK,
+	TAINT_BAD_PAGE,
+	TAINT_USER,
+	TAINT_DIE,
+	TAINT_OVERRIDDEN_ACPI_TABLE,
+	TAINT_WARN,
+	TAINT_CRAP,
+	TAINT_FIRMWARE_WORKAROUND,
+	TAINT_OOT_MODULE,
+	TAINT_UNSIGNED_MODULE,
+	TAINT_SOFTLOCKUP,
+	TAINT_LIVEPATCH,
+	TAINT_AUX,
+
+	/* End of taint bits */
+	TAINT_FLAGS_COUNT
+};
 
 struct taint_flag {
 	char c_true;	/* character printed when tainted */
diff --git a/kernel/panic.c b/kernel/panic.c
index 2cfef408fec9..c5e0fd5a188e 100644
--- a/kernel/panic.c
+++ b/kernel/panic.c
@@ -308,23 +308,23 @@ EXPORT_SYMBOL(panic);
  * is being removed anyway.
  */
 const struct taint_flag taint_flags[TAINT_FLAGS_COUNT] = {
-	{ 'P', 'G', true },	/* TAINT_PROPRIETARY_MODULE */
-	{ 'F', ' ', true },	/* TAINT_FORCED_MODULE */
-	{ 'S', ' ', false },	/* TAINT_CPU_OUT_OF_SPEC */
-	{ 'R', ' ', false },	/* TAINT_FORCED_RMMOD */
-	{ 'M', ' ', false },	/* TAINT_MACHINE_CHECK */
-	{ 'B', ' ', false },	/* TAINT_BAD_PAGE */
-	{ 'U', ' ', false },	/* TAINT_USER */
-	{ 'D', ' ', false },	/* TAINT_DIE */
-	{ 'A', ' ', false },	/* TAINT_OVERRIDDEN_ACPI_TABLE */
-	{ 'W', ' ', false },	/* TAINT_WARN */
-	{ 'C', ' ', true },	/* TAINT_CRAP */
-	{ 'I', ' ', false },	/* TAINT_FIRMWARE_WORKAROUND */
-	{ 'O', ' ', true },	/* TAINT_OOT_MODULE */
-	{ 'E', ' ', true },	/* TAINT_UNSIGNED_MODULE */
-	{ 'L', ' ', false },	/* TAINT_SOFTLOCKUP */
-	{ 'K', ' ', true },	/* TAINT_LIVEPATCH */
-	{ 'X', ' ', true },	/* TAINT_AUX */
+	[ TAINT_PROPRIETARY_MODULE ]	= { 'P', 'G', true },
+	[ TAINT_FORCED_MODULE ]		= { 'F', ' ', true },
+	[ TAINT_CPU_OUT_OF_SPEC ]	= { 'S', ' ', false },
+	[ TAINT_FORCED_RMMOD ]		= { 'R', ' ', false },
+	[ TAINT_MACHINE_CHECK ]		= { 'M', ' ', false },
+	[ TAINT_BAD_PAGE ]		= { 'B', ' ', false },
+	[ TAINT_USER ]			= { 'U', ' ', false },
+	[ TAINT_DIE ]			= { 'D', ' ', false },
+	[ TAINT_OVERRIDDEN_ACPI_TABLE ]	= { 'A', ' ', false },
+	[ TAINT_WARN ]			= { 'W', ' ', false },
+	[ TAINT_CRAP ]			= { 'C', ' ', true },
+	[ TAINT_FIRMWARE_WORKAROUND ]	= { 'I', ' ', false },
+	[ TAINT_OOT_MODULE ]		= { 'O', ' ', true },
+	[ TAINT_UNSIGNED_MODULE ]	= { 'E', ' ', true },
+	[ TAINT_SOFTLOCKUP ]		= { 'L', ' ', false },
+	[ TAINT_LIVEPATCH ]		= { 'K', ' ', true },
+	[ TAINT_AUX ]			= { 'X', ' ', true },
 };
 
 /**
@@ -354,6 +354,8 @@ const char *print_tainted(void)
 {
 	static char buf[TAINT_FLAGS_COUNT + sizeof("Tainted: ")];
 
+	BUILD_BUG_ON(ARRAY_SIZE(taint_flags) != TAINT_FLAGS_COUNT);
+
 	if (tainted_mask) {
 		char *s;
 		int i;
-- 
2.7.4