Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752155AbaKFOj1 (ORCPT ); Thu, 6 Nov 2014 09:39:27 -0500 Received: from mx1.redhat.com ([209.132.183.28]:58249 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751920AbaKFOjU (ORCPT ); Thu, 6 Nov 2014 09:39:20 -0500 From: Seth Jennings To: Josh Poimboeuf , Seth Jennings , Jiri Kosina , Vojtech Pavlik , Steven Rostedt Cc: live-patching@vger.kernel.org, kpatch@redhat.com, linux-kernel@vger.kernel.org Subject: [PATCH 1/2] kernel: add TAINT_LIVEPATCH Date: Thu, 6 Nov 2014 08:39:07 -0600 Message-Id: <1415284748-14648-2-git-send-email-sjenning@redhat.com> In-Reply-To: <1415284748-14648-1-git-send-email-sjenning@redhat.com> References: <1415284748-14648-1-git-send-email-sjenning@redhat.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This adds a new taint flag to indicate when the kernel or a kernel module has been live patched. This will provide a clean indication in bug reports that live patching was used. Additionally, if the crash occurs in a live patched function, the live patch module will appear beside the patched function in the backtrace. Signed-off-by: Seth Jennings --- Documentation/oops-tracing.txt | 2 ++ Documentation/sysctl/kernel.txt | 1 + include/linux/kernel.h | 1 + kernel/panic.c | 2 ++ 4 files changed, 6 insertions(+) diff --git a/Documentation/oops-tracing.txt b/Documentation/oops-tracing.txt index beefb9f..f3ac05c 100644 --- a/Documentation/oops-tracing.txt +++ b/Documentation/oops-tracing.txt @@ -270,6 +270,8 @@ characters, each representing a particular tainted value. 15: 'L' if a soft lockup has previously occurred on the system. + 16: 'K' if the kernel has been live patched. + 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 d7fc4ab..085f73b 100644 --- a/Documentation/sysctl/kernel.txt +++ b/Documentation/sysctl/kernel.txt @@ -831,6 +831,7 @@ 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 - The kernel has been live patched. ============================================================== diff --git a/include/linux/kernel.h b/include/linux/kernel.h index 446d76a..a6aa2df 100644 --- a/include/linux/kernel.h +++ b/include/linux/kernel.h @@ -473,6 +473,7 @@ extern enum system_states { #define TAINT_OOT_MODULE 12 #define TAINT_UNSIGNED_MODULE 13 #define TAINT_SOFTLOCKUP 14 +#define TAINT_LIVEPATCH 15 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 d09dc5c..46bca3d 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_LIVEPATCH, 'K', ' ' }, }; /** @@ -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. + * 'K' - Kernel has been live patched. * * The string is overwritten by the next call to print_tainted(). */ -- 1.9.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/