sysctl: pass kernel pointers to ->proc_handler
Instead of having all the sysctl handlers deal with user pointers, which
is rather hairy in terms of the BPF interaction, copy the input to and
from userspace in common code. This also means that the strings are
always NUL-terminated by the common code, making the API a little bit
safer.
As most handler just pass through the data to one of the common handlers
a lot of the changes are mechnical.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Andrey Ignatov <rdna@fb.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 3a61a3b..5c589a2 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -1110,8 +1110,7 @@ static void uclamp_update_root_tg(void) { }
#endif
int sysctl_sched_uclamp_handler(struct ctl_table *table, int write,
- void __user *buffer, size_t *lenp,
- loff_t *ppos)
+ void *buffer, size_t *lenp, loff_t *ppos)
{
bool update_root_tg = false;
int old_min, old_max;
@@ -2723,7 +2722,7 @@ void set_numabalancing_state(bool enabled)
#ifdef CONFIG_PROC_SYSCTL
int sysctl_numa_balancing(struct ctl_table *table, int write,
- void __user *buffer, size_t *lenp, loff_t *ppos)
+ void *buffer, size_t *lenp, loff_t *ppos)
{
struct ctl_table t;
int err;
@@ -2797,8 +2796,8 @@ static void __init init_schedstats(void)
}
#ifdef CONFIG_PROC_SYSCTL
-int sysctl_schedstats(struct ctl_table *table, int write,
- void __user *buffer, size_t *lenp, loff_t *ppos)
+int sysctl_schedstats(struct ctl_table *table, int write, void *buffer,
+ size_t *lenp, loff_t *ppos)
{
struct ctl_table t;
int err;
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 02f323b..b6077fd 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -645,8 +645,7 @@ struct sched_entity *__pick_last_entity(struct cfs_rq *cfs_rq)
*/
int sched_proc_update_handler(struct ctl_table *table, int write,
- void __user *buffer, size_t *lenp,
- loff_t *ppos)
+ void *buffer, size_t *lenp, loff_t *ppos)
{
int ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
unsigned int factor = get_update_sysctl_factor();
diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c
index df11d88..45da29de 100644
--- a/kernel/sched/rt.c
+++ b/kernel/sched/rt.c
@@ -2714,9 +2714,8 @@ static void sched_rt_do_global(void)
def_rt_bandwidth.rt_period = ns_to_ktime(global_rt_period());
}
-int sched_rt_handler(struct ctl_table *table, int write,
- void __user *buffer, size_t *lenp,
- loff_t *ppos)
+int sched_rt_handler(struct ctl_table *table, int write, void *buffer,
+ size_t *lenp, loff_t *ppos)
{
int old_period, old_runtime;
static DEFINE_MUTEX(mutex);
@@ -2754,9 +2753,8 @@ int sched_rt_handler(struct ctl_table *table, int write,
return ret;
}
-int sched_rr_handler(struct ctl_table *table, int write,
- void __user *buffer, size_t *lenp,
- loff_t *ppos)
+int sched_rr_handler(struct ctl_table *table, int write, void *buffer,
+ size_t *lenp, loff_t *ppos)
{
int ret;
static DEFINE_MUTEX(mutex);
diff --git a/kernel/sched/topology.c b/kernel/sched/topology.c
index 8344757b..fa64b2e 100644
--- a/kernel/sched/topology.c
+++ b/kernel/sched/topology.c
@@ -209,7 +209,7 @@ bool sched_energy_update;
#ifdef CONFIG_PROC_SYSCTL
int sched_energy_aware_handler(struct ctl_table *table, int write,
- void __user *buffer, size_t *lenp, loff_t *ppos)
+ void *buffer, size_t *lenp, loff_t *ppos)
{
int ret, state;