linux-kernel - [v3 01/12] taint: Introduce a new taint flag (insecure)

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Date:   Tue, 23 Oct 2018 11:42:23 -0700
From:   "Chang S. Bae" <chang.seok.bae@...el.com>
To:     Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Andy Lutomirski <luto@...nel.org>,
        "H . Peter Anvin" <hpa@...or.com>
Cc:     Andi Kleen <ak@...ux.intel.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Markus T Metzger <markus.t.metzger@...el.com>,
        Ravi Shankar <ravi.v.shankar@...el.com>,
        "Chang S . Bae" <chang.seok.bae@...el.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: [v3 01/12] taint: Introduce a new taint flag (insecure)

For testing (or root-only) purposes, the new flag will serve to tag the
kernel taint accurately.

When adding a new feature support, patches need to be incrementally
applied and tested with temporal parameters. Currently, there is no flag
for this usage.

Suggested-by: H. Peter Anvin <hpa@...or.com>
Signed-off-by: Chang S. Bae <chang.seok.bae@...el.com>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Andi Kleen <ak@...ux.intel.com>
Cc: Dave Hansen <dave.hansen@...ux.intel.com>
---
 Documentation/sysctl/kernel.txt | 1 +
 include/linux/kernel.h          | 3 ++-
 kernel/panic.c                  | 1 +
 3 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/Documentation/sysctl/kernel.txt b/Documentation/sysctl/kernel.txt
index 37a679501ddc..d682a6551365 100644
--- a/Documentation/sysctl/kernel.txt
+++ b/Documentation/sysctl/kernel.txt
@@ -1017,6 +1017,7 @@ ORed together. The letters are seen in "Tainted" line of Oops reports.
  32768 (K): The kernel has been live patched.
  65536 (X): Auxiliary taint, defined and used by for distros.
 131072 (T): The kernel was built with the struct randomization plugin.
+262144 (Z): The kernel is running in a known insecure configuration.
 
 ==============================================================
 
diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index d6aac75b51ba..38b2657d62d5 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -598,7 +598,8 @@ extern enum system_states {
 #define TAINT_LIVEPATCH			15
 #define TAINT_AUX			16
 #define TAINT_RANDSTRUCT		17
-#define TAINT_FLAGS_COUNT		18
+#define TAINT_INSECURE			18
+#define TAINT_FLAGS_COUNT		19
 
 struct taint_flag {
 	char c_true;	/* character printed when tainted */
diff --git a/kernel/panic.c b/kernel/panic.c
index 8b2e002d52eb..8db2ed9ec290 100644
--- a/kernel/panic.c
+++ b/kernel/panic.c
@@ -327,6 +327,7 @@ const struct taint_flag taint_flags[TAINT_FLAGS_COUNT] = {
 	[ TAINT_LIVEPATCH ]		= { 'K', ' ', true },
 	[ TAINT_AUX ]			= { 'X', ' ', true },
 	[ TAINT_RANDSTRUCT ]		= { 'T', ' ', true },
+	[ TAINT_INSECURE ]		= { 'Z', ' ', false },
 };
 
 /**
-- 
2.19.1