linux-kernel - [PATCH v2 1/7] taint: add TAINT_DEBUG for invasive debugging features

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Date:	Fri,  3 Oct 2014 14:44:37 -0700
From:	"Luis R. Rodriguez" <mcgrof@...not-panic.com>
To:	gregkh@...uxfoundation.org, dmitry.torokhov@...il.com,
	tiwai@...e.de, tj@...nel.org, arjan@...ux.intel.com
Cc:	teg@...m.no, rmilasan@...e.com, werner@...e.com, oleg@...hat.com,
	hare@...e.com, bpoirier@...e.de, santosh@...lsio.com,
	pmladek@...e.cz, dbueso@...e.com, mcgrof@...e.com,
	linux-kernel@...r.kernel.org, Rusty Russell <rusty@...tcorp.com.au>
Subject: [PATCH v2 1/7] taint: add TAINT_DEBUG for invasive debugging features

From: "Luis R. Rodriguez" <mcgrof@...e.com>

At times we may add module parameters or debugging / testing
kernel features, when enabled though we don't really want
to be spending time debugging them. Add a taint flag for
this to avoid spurious bug reports.

Cc: Rusty Russell <rusty@...tcorp.com.au>
Cc: Tejun Heo <tj@...nel.org>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Luis R. Rodriguez <mcgrof@...e.com>
---
 Documentation/sysctl/kernel.txt | 1 +
 include/linux/kernel.h          | 1 +
 kernel/module.c                 | 4 ++--
 kernel/panic.c                  | 2 ++
 4 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/Documentation/sysctl/kernel.txt b/Documentation/sysctl/kernel.txt
index f79eb96..1780a68 100644
--- a/Documentation/sysctl/kernel.txt
+++ b/Documentation/sysctl/kernel.txt
@@ -827,6 +827,7 @@ can be ORed together:
 8192 - An unsigned module has been loaded in a kernel supporting module
        signature.
 16384 - A soft lockup has previously occurred on the system.
+32768 - A possibly disruptive testing / debug kernel feature has been enabled
 
 ==============================================================
 
diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index 95624be..8901809 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -471,6 +471,7 @@ extern enum system_states {
 #define TAINT_OOT_MODULE		12
 #define TAINT_UNSIGNED_MODULE		13
 #define TAINT_SOFTLOCKUP		14
+#define TAINT_DEBUG			15
 
 extern const char hex_asc[];
 #define hex_asc_lo(x)	hex_asc[((x) & 0x0f)]
diff --git a/kernel/module.c b/kernel/module.c
index 03214bd2..3f7d02a 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -1013,8 +1013,8 @@ static size_t module_flags_taint(struct module *mod, char *buf)
 		buf[l++] = 'E';
 	/*
 	 * TAINT_FORCED_RMMOD: could be added.
-	 * TAINT_CPU_OUT_OF_SPEC, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't
-	 * apply to modules.
+	 * TAINT_CPU_OUT_OF_SPEC, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE
+	 * and TAINT_DEBUG don't apply to modules.
 	 */
 	return l;
 }
diff --git a/kernel/panic.c b/kernel/panic.c
index d09dc5c..8e5a77b 100644
--- a/kernel/panic.c
+++ b/kernel/panic.c
@@ -225,6 +225,7 @@ static const struct tnt tnts[] = {
 	{ TAINT_OOT_MODULE,		'O', ' ' },
 	{ TAINT_UNSIGNED_MODULE,	'E', ' ' },
 	{ TAINT_SOFTLOCKUP,		'L', ' ' },
+	{ TAINT_DEBUG,			'T', ' ' },
 };
 
 /**
@@ -244,6 +245,7 @@ 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.
+ *  'T' - System has enabled an intrusive testing / debug kernel feature.
  *
  *	The string is overwritten by the next call to print_tainted().
  */
-- 
2.1.1

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