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| author | Tejun Heo <tj@kernel.org> | 2022-09-04 09:16:19 -1000 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2022-09-04 09:16:19 -1000 |
| commit | dc79ec1b232ad2c165d381d3dd2626df4ef9b5a4 (patch) | |
| tree | e0108805d6810297d8a230eb7c384b37594afdb3 /kernel/cgroup | |
| parent | c0f2df49cf2471289d5aabf16f50ac26eb268f7d (diff) | |
| download | linux-dc79ec1b232ad2c165d381d3dd2626df4ef9b5a4.tar.bz2 | |
cgroup: Remove data-race around cgrp_dfl_visible
There's a seemingly harmless data-race around cgrp_dfl_visible detected by
kernel concurrency sanitizer. Let's remove it by throwing WRITE/READ_ONCE at
it.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-by: Abhishek Shah <abhishek.shah@columbia.edu>
Cc: Gabriel Ryan <gabe@cs.columbia.edu>
Reviewed-by: Christian Brauner (Microsoft) <brauner@kernel.org>
Link: https://lore.kernel.org/netdev/20220819072256.fn7ctciefy4fc4cu@wittgenstein/
Diffstat (limited to 'kernel/cgroup')
| -rw-r--r-- | kernel/cgroup/cgroup.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/kernel/cgroup/cgroup.c b/kernel/cgroup/cgroup.c index 0005de2e2ed9..e0b72eb5d283 100644 --- a/kernel/cgroup/cgroup.c +++ b/kernel/cgroup/cgroup.c @@ -2173,7 +2173,7 @@ static int cgroup_get_tree(struct fs_context *fc) struct cgroup_fs_context *ctx = cgroup_fc2context(fc); int ret; - cgrp_dfl_visible = true; + WRITE_ONCE(cgrp_dfl_visible, true); cgroup_get_live(&cgrp_dfl_root.cgrp); ctx->root = &cgrp_dfl_root; @@ -6098,7 +6098,7 @@ int proc_cgroup_show(struct seq_file *m, struct pid_namespace *ns, struct cgroup *cgrp; int ssid, count = 0; - if (root == &cgrp_dfl_root && !cgrp_dfl_visible) + if (root == &cgrp_dfl_root && !READ_ONCE(cgrp_dfl_visible)) continue; seq_printf(m, "%d:", root->hierarchy_id); |