[PATCH] security: Remove unused field from security_hook_list

[Casey Schaufler]

On 4/12/2018 7:18 AM, Tetsuo Handa wrote:
> Sargun Dhillon wrote:
>> It appears like char * lsm on struct security_hook_list is unused. Even
>> since its inception: https://patchwork.kernel.org/patch/9525051/
>> it hasn't been read, only written to. This removes that.

tl;dr - I hope to use it in 4.18

I have been trying to get my patch for Smack that creates a
subdirectory in /proc/.../attr/ in for some time. That
patch uses the lsm field in security_hook_list. While the
Smack directory is very important for stacking, I want it
regardless as reusing the SELinux attribute files was a mistake.

> It was preserved based on an assumption that complete stacking is accepted in
> near future, but still not available. Maybe we can delete this field for now?

Yes, we can. There would be a merge conflict should I get my way
on the Smack subdirectory.

James, I *still* want /proc/.../attr/smack regardless of the rest
of stacking. I want to start fixing the Smack user space. This is
required, by stacking, but strongly desired in any case.

> http://kernsec.org/pipermail/linux-security-module-archive/2017-March/000104.html
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