linux-kernel - [PATCH 1/4] added SECURITY_TIOCSTI

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Date:   Mon, 17 Apr 2017 02:07:03 -0400
From:   Matt Brown <matt@...tt.com>
To:     jmorris@...ei.org, gregkh@...uxfoundation.org,
        akpm@...ux-foundation.org
Cc:     linux-security-module@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel-hardening@...ts.openwall.com,
        Matt Brown <matt@...tt.com>
Subject: [PATCH 1/4] added SECURITY_TIOCSTI_RESTRICT kernel config

adding the kernel config SECURITY_TIOCSTI_RESTRICT in order to allow
the user to restrict unprivileged command injection using TIOCSTI
tty ioctls

Signed-off-by: Matt Brown <matt@...tt.com>
---
 security/Kconfig | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/security/Kconfig b/security/Kconfig
index 3ff1bf9..d757bcb 100644
--- a/security/Kconfig
+++ b/security/Kconfig
@@ -18,6 +18,18 @@ config SECURITY_DMESG_RESTRICT
 
 	  If you are unsure how to answer this question, answer N.
 
+config SECURITY_TIOCSTI_RESTRICT
+        bool "Restrict unprivileged use of tiocsti command injection"
+        default n
+        help
+	  This enforces restrictions on unprivileged users injecting commands
+	  into other processes in the same tty session using the TIOCSTI ioctl
+
+	  If this option is not selected, no restrictions will be enforced
+	  unless the tiocsti_restrict sysctl is explicitly set to (1).
+
+	  If you are unsure how to answer this question, answer N.
+
 config SECURITY
 	bool "Enable different security models"
 	depends on SYSFS
-- 
2.10.2