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Subject[PATCH 4/5] v2 seccomp_filter: add process state reporting
Date
Adds seccomp_filter status reporting to proc.
/proc/<pid>/seccomp_filter will provide read-only access to the current
filter set.

v2: removed status entry, added seccomp file.
(requested by kosaki.motohiro@jp.fujitsu.com)
allowed S_IRUGO reading of entries
(requested by viro@zeniv.linux.org.uk)
added flags
got rid of the seccomp_t type
dropped seccomp file

Signed-off-by: Will Drewry <wad@chromium.org>
---
fs/proc/base.c | 25 +++++++++++++++++++++++++
1 files changed, 25 insertions(+), 0 deletions(-)
diff --git a/fs/proc/base.c b/fs/proc/base.c
index dfa5327..f991d1a 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -73,6 +73,7 @@
#include <linux/security.h>
#include <linux/ptrace.h>
#include <linux/tracehook.h>
+#include <linux/seccomp.h>
#include <linux/cgroup.h>
#include <linux/cpuset.h>
#include <linux/audit.h>
@@ -579,6 +580,24 @@ static int proc_pid_syscall(struct task_struct *task, char *buffer)
}
#endif /* CONFIG_HAVE_ARCH_TRACEHOOK */

+/*
+ * Print out the current seccomp filter set for the task.
+ */
+#ifdef CONFIG_SECCOMP_FILTER
+int proc_pid_seccomp_filter_show(struct seq_file *m, struct pid_namespace *ns,
+ struct pid *pid, struct task_struct *task)
+{
+ struct seccomp_state *state;
+
+ rcu_read_lock();
+ state = get_seccomp_state(task->seccomp);
+ rcu_read_unlock();
+ seccomp_show_filters(state, m);
+ put_seccomp_state(state);
+ return 0;
+}
+#endif /* CONFIG_SECCOMP_FILTER */
+
/************************************************************************/
/* Here the fs part begins */
/************************************************************************/
@@ -2838,6 +2857,9 @@ static const struct pid_entry tgid_base_stuff[] = {
#ifdef CONFIG_HAVE_ARCH_TRACEHOOK
INF("syscall", S_IRUGO, proc_pid_syscall),
#endif
+#ifdef CONFIG_SECCOMP_FILTER
+ ONE("seccomp_filter", S_IRUGO, proc_pid_seccomp_filter_show),
+#endif
INF("cmdline", S_IRUGO, proc_pid_cmdline),
ONE("stat", S_IRUGO, proc_tgid_stat),
ONE("statm", S_IRUGO, proc_pid_statm),
@@ -3180,6 +3202,9 @@ static const struct pid_entry tid_base_stuff[] = {
#ifdef CONFIG_HAVE_ARCH_TRACEHOOK
INF("syscall", S_IRUGO, proc_pid_syscall),
#endif
+#ifdef CONFIG_SECCOMP_FILTER
+ ONE("seccomp_filter", S_IRUGO, proc_pid_seccomp_filter_show),
+#endif
INF("cmdline", S_IRUGO, proc_pid_cmdline),
ONE("stat", S_IRUGO, proc_tid_stat),
ONE("statm", S_IRUGO, proc_pid_statm),
--
1.7.0.4


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