linux-kernel - [PATCH v5 2/5] seccomp: make get_nth_filter available outside of CHECKPOINT

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Message-Id: <20180828143603.8127-3-tycho@tycho.ws>
Date:   Tue, 28 Aug 2018 08:36:00 -0600
From:   Tycho Andersen <tycho@...ho.ws>
To:     Kees Cook <keescook@...omium.org>
Cc:     linux-kernel@...r.kernel.org,
        containers@...ts.linux-foundation.org, linux-api@...r.kernel.org,
        Andy Lutomirski <luto@...capital.net>,
        Oleg Nesterov <oleg@...hat.com>,
        "Eric W . Biederman" <ebiederm@...ssion.com>,
        "Serge E . Hallyn" <serge@...lyn.com>,
        Christian Brauner <christian.brauner@...ntu.com>,
        Tyler Hicks <tyhicks@...onical.com>,
        Akihiro Suda <suda.akihiro@....ntt.co.jp>,
        Tycho Andersen <tycho@...ho.ws>
Subject: [PATCH v5 2/5] seccomp: make get_nth_filter available outside of CHECKPOINT_RESTORE

In the next commit we'll use this same mnemonic to get a listener for the
nth filter, so we need it available outside of CHECKPOINT_RESTORE in the
USER_NOTIFICATION case as well.

v2: new in v2
v3: no changes
v4: no changes
v5: switch to CHECKPOINT_RESTORE || USER_NOTIFICATION to avoid warning when
    only CONFIG_SECCOMP_FILTER is enabled.

Signed-off-by: Tycho Andersen <tycho@...ho.ws>
CC: Kees Cook <keescook@...omium.org>
CC: Andy Lutomirski <luto@...capital.net>
CC: Oleg Nesterov <oleg@...hat.com>
CC: Eric W. Biederman <ebiederm@...ssion.com>
CC: "Serge E. Hallyn" <serge@...lyn.com>
CC: Christian Brauner <christian.brauner@...ntu.com>
CC: Tyler Hicks <tyhicks@...onical.com>
CC: Akihiro Suda <suda.akihiro@....ntt.co.jp>
---
 kernel/seccomp.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/kernel/seccomp.c b/kernel/seccomp.c
index a09eb5c05f68..ed786655186d 100644
--- a/kernel/seccomp.c
+++ b/kernel/seccomp.c
@@ -1188,7 +1188,8 @@ long prctl_set_seccomp(unsigned long seccomp_mode, char __user *filter)
 	return do_seccomp(op, 0, uargs);
 }
 
-#if defined(CONFIG_SECCOMP_FILTER) && defined(CONFIG_CHECKPOINT_RESTORE)
+#if defined(CONFIG_CHECKPOINT_RESTORE) || \
+	defined(CONFIG_SECCOMP_USER_NOTIFICATION)
 static struct seccomp_filter *get_nth_filter(struct task_struct *task,
 					     unsigned long filter_off)
 {
@@ -1235,6 +1236,7 @@ static struct seccomp_filter *get_nth_filter(struct task_struct *task,
 	return filter;
 }
 
+#if defined(CONFIG_CHECKPOINT_RESTORE)
 long seccomp_get_filter(struct task_struct *task, unsigned long filter_off,
 			void __user *data)
 {
@@ -1307,7 +1309,8 @@ long seccomp_get_metadata(struct task_struct *task,
 	__put_seccomp_filter(filter);
 	return ret;
 }
-#endif
+#endif /* CONFIG_CHECKPOINT_RESTORE */
+#endif /* CONFIG_SECCOMP_FILTER */
 
 #ifdef CONFIG_SYSCTL
 
-- 
2.17.1