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mptcp: only allow set existing scheduler for net.mptcp.scheduler 

commit 6963c508fd upstream.

The current behavior is to accept any strings as inputs, this results in
an inconsistent result where an unexisting scheduler can be set:

  # sysctl -w net.mptcp.scheduler=notdefault
  net.mptcp.scheduler = notdefault

This patch changes this behavior by checking for existing scheduler
before accepting the input.

Fixes: e3b2870b6d ("mptcp: add a new sysctl scheduler")
Cc: stable@vger.kernel.org
Signed-off-by: Gregory Detal <gregory.detal@gmail.com>
Reviewed-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Tested-by: Geliang Tang <geliang@kernel.org>
Reviewed-by: Mat Martineau <martineau@kernel.org>
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Link: https://lore.kernel.org/r/20240506-upstream-net-20240506-mptcp-sched-exist-v1-1-2ed1529e521e@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Gregory Detal 2024-05-06 17:35:28 +02:00 committed by Greg Kroah-Hartman
parent aa0c07c1f2
commit daad878a50
1 changed files with 38 additions and 1 deletions
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39
net/mptcp/ctrl.c
View File

@ -87,6 +87,43 @@ static void mptcp_pernet_set_defaults(struct mptcp_pernet *pernet)
}
#ifdef CONFIG_SYSCTL
static int mptcp_set_scheduler(const struct net *net, const char *name)
{
struct mptcp_pernet *pernet = mptcp_get_pernet(net);
struct mptcp_sched_ops *sched;
int ret = 0;
rcu_read_lock();
sched = mptcp_sched_find(name);
if (sched)
strscpy(pernet->scheduler, name, MPTCP_SCHED_NAME_MAX);
else
ret = -ENOENT;
rcu_read_unlock();
return ret;
}
static int proc_scheduler(struct ctl_table *ctl, int write,
void *buffer, size_t *lenp, loff_t *ppos)
{
const struct net *net = current->nsproxy->net_ns;
char val[MPTCP_SCHED_NAME_MAX];
struct ctl_table tbl = {
.data = val,
.maxlen = MPTCP_SCHED_NAME_MAX,
};
int ret;
strscpy(val, mptcp_get_scheduler(net), MPTCP_SCHED_NAME_MAX);
ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
if (write && ret == 0)
ret = mptcp_set_scheduler(net, val);
return ret;
}
static struct ctl_table mptcp_sysctl_table[] = {
{
.procname = "enabled",
@ -139,7 +176,7 @@ static struct ctl_table mptcp_sysctl_table[] = {
.procname = "scheduler",
.maxlen = MPTCP_SCHED_NAME_MAX,
.mode = 0644,
.proc_handler = proc_dostring,
.proc_handler = proc_scheduler,
},
{}
};