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cgroup: Honor caller's cgroup NS when resolving path 

[ Upstream commit 74e4b956eb ]

cgroup_get_from_path() is not widely used function. Its callers presume
the path is resolved under cgroup namespace. (There is one caller
currently and resolving in init NS won't make harm (netfilter). However,
future users may be subject to different effects when resolving
globally.)
Since, there's currently no use for the global resolution, modify the
existing function to take cgroup NS into account.

Fixes: a79a908fd2 ("cgroup: introduce cgroup namespaces")
Signed-off-by: Michal Koutný <mkoutny@suse.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Michal Koutný 2022-08-26 18:52:35 +02:00 committed by Greg Kroah-Hartman
parent 8ffe511b7d
commit 507128a0e3
1 changed files with 5 additions and 1 deletions
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6
kernel/cgroup/cgroup.c
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@ -6598,8 +6598,12 @@ struct cgroup *cgroup_get_from_path(const char *path)
{
struct kernfs_node *kn;
struct cgroup *cgrp = ERR_PTR(-ENOENT);
struct cgroup *root_cgrp;
kn = kernfs_walk_and_get(cgrp_dfl_root.cgrp.kn, path);
spin_lock_irq(&css_set_lock);
root_cgrp = current_cgns_cgroup_from_root(&cgrp_dfl_root);
kn = kernfs_walk_and_get(root_cgrp->kn, path);
spin_unlock_irq(&css_set_lock);
if (!kn)
goto out;