linux-kernel - [PATCH] timer: fix timer_migration to accept only 0 and 1

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Message-Id: <1492640690-3550-1-git-send-email-mhjungk@gmail.com>
Date:   Wed, 19 Apr 2017 15:24:50 -0700
From:   Myungho Jung <mhjungk@...il.com>
To:     tglx@...utronix.de
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH] timer: fix timer_migration to accept only 0 and 1

Error is not shown by setting invalid value to timer_migration. Valid
values for timer_migration should be restricted to 0 and 1. Testcase for
this bug is ltp/runpwtests06.

Signed-off-by: Myungho Jung <mhjungk@...il.com>
---
 kernel/sysctl.c     | 2 ++
 kernel/time/timer.c | 2 +-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 8c8714f..21343d1 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -1176,6 +1176,8 @@ static struct ctl_table kern_table[] = {
 		.maxlen		= sizeof(unsigned int),
 		.mode		= 0644,
 		.proc_handler	= timer_migration_handler,
+		.extra1		= &zero,
+		.extra2		= &one,
 	},
 #endif
 #ifdef CONFIG_BPF_SYSCALL
diff --git a/kernel/time/timer.c b/kernel/time/timer.c
index 1dc0256..cc6b6bd 100644
--- a/kernel/time/timer.c
+++ b/kernel/time/timer.c
@@ -241,7 +241,7 @@ int timer_migration_handler(struct ctl_table *table, int write,
 	int ret;
 
 	mutex_lock(&mutex);
-	ret = proc_dointvec(table, write, buffer, lenp, ppos);
+	ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
 	if (!ret && write)
 		timers_update_migration(false);
 	mutex_unlock(&mutex);
-- 
2.7.4