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cgroup-v1: add disabled controller check in cgroup1_parse_param()

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When mounting a cgroup hierarchy with disabled controller in cgroup v1,
all available controllers will be attached.
For example, boot with cgroup_no_v1=cpu or cgroup_disable=cpu, and then
mount with "mount -t cgroup -ocpu cpu /sys/fs/cgroup/cpu", then all
enabled controllers will be attached except cpu.

Fix this by adding disabled controller check in cgroup1_parse_param().
If the specified controller is disabled, just return error with information
"Disabled controller xx" rather than attaching all the other enabled
controllers.

Fixes: f5dfb5315d ("cgroup: take options parsing into ->parse_monolithic()")
Signed-off-by: Chen Zhou <chenzhou10@huawei.com>
Reviewed-by: Zefan Li <lizefan.x@bytedance.com>
Reviewed-by: Michal Koutný <mkoutny@suse.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Chen Zhou 2021-01-15 17:37:17 +08:00 committed by Tejun Heo
parent f4e087c666
commit 61e960b07b
1 changed files with 3 additions and 0 deletions
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3
kernel/cgroup/cgroup-v1.c
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@ -917,6 +917,9 @@ int cgroup1_parse_param(struct fs_context *fc, struct fs_parameter *param)
for_each_subsys(ss, i) {
if (strcmp(param->key, ss->legacy_name))
continue;
if (!cgroup_ssid_enabled(i) || cgroup1_ssid_disabled(i))
return invalfc(fc, "Disabled controller '%s'",
param->key);
ctx->subsys_mask |= (1 << i);
return 0;
}