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cgroup: avoid copying strings longer than the buffers

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cgroup root name and file name have max length limit, we should
avoid copying longer name than that to the name.

tj: minor update to $SUBJ.

Signed-off-by: Ma Shimiao <mashimiao.fnst@cn.fujitsu.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Ma Shimiao 2017-12-12 09:43:49 +08:00 • committed by Tejun Heo
parent c2f31b79d5
commit e7fd37ba12
1 changed files with 3 additions and 3 deletions
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6
kernel/cgroup/cgroup.c
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@ -1397,7 +1397,7 @@ static char *cgroup_file_name(struct cgroup *cgrp, const struct cftype *cft,
cgroup_on_dfl(cgrp) ? ss->name : ss->legacy_name, cgroup_on_dfl(cgrp) ? ss->name : ss->legacy_name,
cft->name); cft->name);
else else
strncpy(buf, cft->name, CGROUP_FILE_NAME_MAX); strscpy(buf, cft->name, CGROUP_FILE_NAME_MAX);
return buf; return buf;
} }
@ -1864,9 +1864,9 @@ void init_cgroup_root(struct cgroup_root *root, struct cgroup_sb_opts *opts)
root->flags = opts->flags; root->flags = opts->flags;
if (opts->release_agent) if (opts->release_agent)
strcpy(root->release_agent_path, opts->release_agent); strscpy(root->release_agent_path, opts->release_agent, PATH_MAX);
if (opts->name) if (opts->name)
strcpy(root->name, opts->name); strscpy(root->name, opts->name, MAX_CGROUP_ROOT_NAMELEN);
if (opts->cpuset_clone_children) if (opts->cpuset_clone_children)
set_bit(CGRP_CPUSET_CLONE_CHILDREN, &root->cgrp.flags); set_bit(CGRP_CPUSET_CLONE_CHILDREN, &root->cgrp.flags);
} }