Messages in this thread Patch in this message | | | From | Yajun Deng <> | Subject | [PATCH v2] sched/rt: fix the case where sched_rt_period_us is negative | Date | Thu, 12 May 2022 08:39:45 +0800 |
| |
The proc_dointvec() is for integer, but sysctl_sched_rt_period is a unsigned integer, proc_dointvec() would convert negative number into positive number. So both proc_dointvec() and sched_rt_global_validate() aren't return error even if we set a negative number.
Use proc_dointvec_minmax() instead of proc_dointvec() and use extra1 limit the minimum value for sched_rt_period_us/sched_rt_runtime_us.
Fixes: 391e43da797a ("sched: Move all scheduler bits into kernel/sched/") Signed-off-by: Yajun Deng <yajun.deng@linux.dev> --- kernel/sched/rt.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c index b491a0f8c25d..3add32679885 100644 --- a/kernel/sched/rt.c +++ b/kernel/sched/rt.c @@ -37,6 +37,7 @@ static struct ctl_table sched_rt_sysctls[] = { .maxlen = sizeof(unsigned int), .mode = 0644, .proc_handler = sched_rt_handler, + .extra1 = SYSCTL_ONE, }, { .procname = "sched_rt_runtime_us", @@ -44,6 +45,8 @@ static struct ctl_table sched_rt_sysctls[] = { .maxlen = sizeof(int), .mode = 0644, .proc_handler = sched_rt_handler, + .extra1 = SYSCTL_NEG_ONE, + .extra2 = (void *)&sysctl_sched_rt_period, }, { .procname = "sched_rr_timeslice_ms", @@ -2959,9 +2962,6 @@ static int sched_rt_global_constraints(void) #ifdef CONFIG_SYSCTL static int sched_rt_global_validate(void) { - if (sysctl_sched_rt_period <= 0) - return -EINVAL; - if ((sysctl_sched_rt_runtime != RUNTIME_INF) && ((sysctl_sched_rt_runtime > sysctl_sched_rt_period) || ((u64)sysctl_sched_rt_runtime * @@ -2992,7 +2992,7 @@ static int sched_rt_handler(struct ctl_table *table, int write, void *buffer, old_period = sysctl_sched_rt_period; old_runtime = sysctl_sched_rt_runtime; - ret = proc_dointvec(table, write, buffer, lenp, ppos); + ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos); if (!ret && write) { ret = sched_rt_global_validate(); -- 2.25.1
| |