Re: [PATCH 1/2] module: Correctly truncate sysfs sections output

On Thu, Aug 06, 2020 at 11:35:38PM -0700, Kees Cook wrote:

The only-root-readable /sys/module/$module/sections/$section files did not truncate their output to the available buffer size. While most paths into the kernfs read handlers end up using PAGE_SIZE buffers, it's possible to get there through other paths (e.g. splice, sendfile). Actually limit the output to the "count" passed into the read function, and report it back correctly. *sigh*

Ugh, never thought about that...

Reviewed-by: Greg Kroah-Hartman gregkh@linuxfoundation.org