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cgroup: Replace all non-returning strlcpy with strscpy

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strlcpy() reads the entire source buffer first.
This read may exceed the destination size limit.
This is both inefficient and can lead to linear read
overflows if a source string is not NUL-terminated [1].
In an effort to remove strlcpy() completely [2], replace
strlcpy() here with strscpy().
No return values were used, so direct replacement is safe.

[1] https://www.kernel.org/doc/html/latest/process/deprecated.html#strlcpy
[2] https://github.com/KSPP/linux/issues/89

Signed-off-by: Azeem Shaikh <azeemshaikh38@gmail.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Azeem Shaikh 2023-05-17 14:49:10 +00:00 committed by Tejun Heo
parent 6588880509
commit c33080cdc0
1 changed files with 2 additions and 2 deletions
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4
kernel/cgroup/cgroup-v1.c
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@ -563,7 +563,7 @@ static ssize_t cgroup_release_agent_write(struct kernfs_open_file *of,
if (!cgrp)
return -ENODEV;
spin_lock(&release_agent_path_lock);
strlcpy(cgrp->root->release_agent_path, strstrip(buf),
strscpy(cgrp->root->release_agent_path, strstrip(buf),
sizeof(cgrp->root->release_agent_path));
spin_unlock(&release_agent_path_lock);
cgroup_kn_unlock(of->kn);
@ -797,7 +797,7 @@ void cgroup1_release_agent(struct work_struct *work)
goto out_free;
spin_lock(&release_agent_path_lock);
strlcpy(agentbuf, cgrp->root->release_agent_path, PATH_MAX);
strscpy(agentbuf, cgrp->root->release_agent_path, PATH_MAX);
spin_unlock(&release_agent_path_lock);
if (!agentbuf[0])
goto out_free;