linux-kernel - [PATCH] proc: add "Seccomp" to status

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Message-ID: <20121031200926.GA22988@www.outflux.net>
Date:	Wed, 31 Oct 2012 13:09:27 -0700
From:	Kees Cook <keescook@...omium.org>
To:	linux-kernel@...r.kernel.org
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Will Drewry <wad@...omium.org>,
	Kees Cook <keescook@...omium.org>,
	Serge Hallyn <serge.hallyn@...onical.com>,
	Cyrill Gorcunov <gorcunov@...nvz.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Subject: [PATCH] proc: add "Seccomp" to status

Adds the seccomp mode to the /proc/$pid/status file so the state of
seccomp can be externally examined.

Signed-off-by: Kees Cook <keescook@...omium.org>
---
 fs/proc/array.c |    8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/fs/proc/array.c b/fs/proc/array.c
index c1c207c..135d6ac 100644
--- a/fs/proc/array.c
+++ b/fs/proc/array.c
@@ -327,6 +327,13 @@ static inline void task_cap(struct seq_file *m, struct task_struct *p)
 	render_cap_t(m, "CapBnd:\t", &cap_bset);
 }
 
+static inline void task_seccomp(struct seq_file *m, struct task_struct *p)
+{
+#ifdef CONFIG_SECCOMP
+	seq_printf(m, "Seccomp:\t%d\n", p->seccomp.mode);
+#endif
+}
+
 static inline void task_context_switch_counts(struct seq_file *m,
 						struct task_struct *p)
 {
@@ -360,6 +367,7 @@ int proc_pid_status(struct seq_file *m, struct pid_namespace *ns,
 	}
 	task_sig(m, task);
 	task_cap(m, task);
+	task_seccomp(m, task);
 	task_cpus_allowed(m, task);
 	cpuset_task_status_allowed(m, task);
 	task_context_switch_counts(m, task);
-- 
1.7.9.5


-- 
Kees Cook
Chrome OS Security
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