Re: [PATCH 0/5] kallsyms: make kallsym APIs more safe with scnprintf

[Christoph Hellwig]

On Fri, May 20, 2022 at 02:06:56PM +0530, Maninder Singh wrote:
> kallsyms functionality depends on KSYM_NAME_LEN directly.
> but if user passed array length lesser than it, sprintf
> can cause issues of buffer overflow attack.
> 
> So changing *sprint* and *lookup* APIs in this patch set
> to have buffer size as an argument and replacing sprintf with
> scnprintf.

This is still a pretty horrible API.  Passing something like
a struct seq_buf seems like the much better API here.  Also with
the amount of arguments and by reference passing it might be worth
to pass them as a structure while you're at it.