timer/sysclt: Restrict timer migration sysctl values to 0 and 1

commit b94bf594cf8ed67cdd0439e70fa939783471597a upstream.

timer_migration sysctl acts as a boolean switch, so the allowed values
should be restricted to 0 and 1.

Add the necessary extra fields to the sysctl table entry to enforce that.

[ tglx: Rewrote changelog ]

Signed-off-by: Myungho Jung <mhjungk@gmail.com>
Link: http://lkml.kernel.org/r/1492640690-3550-1-git-send-email-mhjungk@gmail.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Kazuhiro Hayashi <kazuhiro3.hayashi@toshiba.co.jp>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index bc15d6c4eb6610afa511b0bae50ab73b1a9f1a65..f498aa1d9f0d80bf33fa4d1950712b13be9754f1 100644 (file)
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -1201,6 +1201,8 @@ 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 df445cde8a1eac9bd7797bd8fa1d2a4b8af8fcf9..7d670362891a9c563d1b68e699eb0a9ef01ebf7e 100644 (file)
--- a/kernel/time/timer.c
+++ b/kernel/time/timer.c
@@ -240,7 +240,7 @@ 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);