linux-kernel - [PATCH v2 2/2] audit: Mark CONFIG_AUDITSYSCALL BROKEN and update help text

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Date:	Wed, 28 May 2014 18:44:01 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	Andy Lutomirski <luto@...capital.net>,
	Philipp Kern <pkern@...gle.com>,
	"H. Peter Anvin" <hpa@...ux.intel.com>,
	linux-kernel@...r.kernel.org, "H. J. Lu" <hjl.tools@...il.com>,
	Eric Paris <eparis@...hat.com>, security@...nel.org,
	greg@...ah.com, linux-audit@...hat.com
Subject: [PATCH v2 2/2] audit: Mark CONFIG_AUDITSYSCALL BROKEN and update help text

Here are some issues with the code:
 - It thinks that syscalls have four arguments.
 - It's a performance disaster.
 - It assumes that syscall numbers are between 0 and 2048.
 - It's unclear whether it's supposed to be reliable.
 - It's broken on things like x32.
 - It can't support ARM OABI.
 - Its approach to freeing memory is terrifying.

Signed-off-by: Andy Lutomirski <luto@...capital.net>
---
 init/Kconfig | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/init/Kconfig b/init/Kconfig
index 9d3585b..24d4b53 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -296,13 +296,16 @@ config HAVE_ARCH_AUDITSYSCALL
 	bool
 
 config AUDITSYSCALL
-	bool "Enable system-call auditing support"
-	depends on AUDIT && HAVE_ARCH_AUDITSYSCALL
+	bool "Enable system-call auditing support (not recommended)"
+	depends on AUDIT && HAVE_ARCH_AUDITSYSCALL && BROKEN
 	default y if SECURITY_SELINUX
 	help
-	  Enable low-overhead system-call auditing infrastructure that
-	  can be used independently or with another kernel subsystem,
-	  such as SELinux.
+	  Enable system-call auditing infrastructure that can be used
+	  independently or with another kernel subsystem, such as
+	  SELinux.
+
+	  AUDITSYSCALL has serious performance and correctness issues.
+	  Use it with extreme caution.
 
 config AUDIT_WATCH
 	def_bool y
-- 
1.9.3

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