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

commit b94bf594cf 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>
This commit is contained in:
Myungho Jung 2017-04-19 15:24:50 -07:00 committed by Greg Kroah-Hartman
parent e2f803481a
commit 4c00015385
2 changed files with 3 additions and 1 deletions
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2
kernel/sysctl.c
View File

@ -1189,6 +1189,8 @@ 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

2
kernel/time/timer.c
View File

@ -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);