From: Chen Zhou <chenzhou10@huawei.com>
Date: Fri, 15 Jan 2021 17:37:17 +0800
Subject: cgroup-v1: add disabled controller check in cgroup1_parse_param()
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Git-commit: 61e960b07b637f0295308ad91268501d744c21b5
Patch-mainline: v5.11
References: bsc#1182684
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: f5dfb5315d34 ("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>
[mkoutny: s/invalfc/cg_invalf/]
Acked-by: Michal Koutný <mkoutny@suse.com>
---
kernel/cgroup/cgroup-v1.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/kernel/cgroup/cgroup-v1.c b/kernel/cgroup/cgroup-v1.c
index 32596fdbcd5b..a5751784ad74 100644
--- a/kernel/cgroup/cgroup-v1.c
+++ b/kernel/cgroup/cgroup-v1.c
@@ -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 cg_invalf(fc, "Disabled controller '%s'",
+ param->key);
ctx->subsys_mask |= (1 << i);
return 0;
}