linux-kernel - [PATCH] seccomp: fix the cond to report loaded filters

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Date:   Sun, 21 Mar 2021 15:52:19 +0000
From:   <Kenta.Tada@...y.com>
To:     <keescook@...omium.org>, <containers@...ts.linux-foundation.org>
CC:     <adobriyan@...il.com>, <luto@...capital.net>, <wad@...omium.org>,
        <peterz@...radead.org>, <christian.brauner@...ntu.com>,
        <avagin@...il.com>, <gladkov.alexey@...il.com>,
        <amistry@...gle.com>, <michael.weiss@...ec.fraunhofer.de>,
        <ebiederm@...ssion.com>, <paulmck@...nel.org>, <shorne@...il.com>,
        <samitolvanen@...gle.com>, <elver@...gle.com>, <axboe@...nel.dk>,
        <rostedt@...dmis.org>, <a.darwish@...utronix.de>,
        <rppt@...nel.org>, <andreyknvl@...gle.com>,
        <linux-kernel@...r.kernel.org>, <linux-fsdevel@...r.kernel.org>,
        <Kenta.Tada@...y.com>
Subject: [PATCH] seccomp: fix the cond to report loaded filters

Strictly speaking, seccomp filters are only used
when CONFIG_SECCOMP_FILTER.
This patch fixes the condition to enable "Seccomp_filters"
in /proc/$pid/status.

Signed-off-by: Kenta Tada <Kenta.Tada@...y.com>
---
 fs/proc/array.c  | 2 ++
 init/init_task.c | 2 +-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/fs/proc/array.c b/fs/proc/array.c
index bb87e4d89cd8..7ec59171f197 100644
--- a/fs/proc/array.c
+++ b/fs/proc/array.c
@@ -342,8 +342,10 @@ static inline void task_seccomp(struct seq_file *m, struct task_struct *p)
 	seq_put_decimal_ull(m, "NoNewPrivs:\t", task_no_new_privs(p));
 #ifdef CONFIG_SECCOMP
 	seq_put_decimal_ull(m, "\nSeccomp:\t", p->seccomp.mode);
+#ifdef CONFIG_SECCOMP_FILTER
 	seq_put_decimal_ull(m, "\nSeccomp_filters:\t",
 			    atomic_read(&p->seccomp.filter_count));
+#endif
 #endif
 	seq_puts(m, "\nSpeculation_Store_Bypass:\t");
 	switch (arch_prctl_spec_ctrl_get(p, PR_SPEC_STORE_BYPASS)) {
diff --git a/init/init_task.c b/init/init_task.c
index 3711cdaafed2..8b08c2e19cbb 100644
--- a/init/init_task.c
+++ b/init/init_task.c
@@ -210,7 +210,7 @@ struct task_struct init_task
 #ifdef CONFIG_SECURITY
 	.security	= NULL,
 #endif
-#ifdef CONFIG_SECCOMP
+#ifdef CONFIG_SECCOMP_FILTER
 	.seccomp	= { .filter_count = ATOMIC_INIT(0) },
 #endif
 };
-- 
2.25.1