This is a note to let you know that I've just added the patch titled
timer/sysclt: Restrict timer migration sysctl values to 0 and 1
to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
timer-sysclt-restrict-timer-migration-sysctl-values-to-0-and-1.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From b94bf594cf8ed67cdd0439e70fa939783471597a Mon Sep 17 00:00:00 2001
From: Myungho Jung <mhjungk@xxxxxxxxx>
Date: Wed, 19 Apr 2017 15:24:50 -0700
Subject: timer/sysclt: Restrict timer migration sysctl values to 0 and 1
From: Myungho Jung <mhjungk@xxxxxxxxx>
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@xxxxxxxxx>
Link: http://lkml.kernel.org/r/1492640690-3550-1-git-send-email-mhjungk@xxxxxxxxx
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Kazuhiro Hayashi <kazuhiro3.hayashi@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
kernel/sysctl.c | 2 ++
kernel/time/timer.c | 2 +-
2 files changed, 3 insertions(+), 1 deletion(-)
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -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
--- a/kernel/time/timer.c
+++ b/kernel/time/timer.c
@@ -240,7 +240,7 @@ int timer_migration_handler(struct ctl_t
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);
Patches currently in stable-queue which might be from mhjungk@xxxxxxxxx are
queue-4.9/timer-sysclt-restrict-timer-migration-sysctl-values-to-0-and-1.patch