Description: powerpc/rtas: Restrict RTAS requests from userspace
References:
 https://www.openwall.com/lists/oss-security/2020/10/09/1
Notes:
 bwh> I think this can be ignored for buster as we do not support
 bwh> Secure Boot on powerpc architectures.
Bugs:
upstream: released (5.10-rc1) [bd59380c5ba4147dcbaad3e582b55ccfd120b764]
4.19-upstream-stable: released (4.19.155) [94e8f0bbc475228c93d28b2e0f7e37303db80ffe]
4.9-upstream-stable: ignored "Only an issue when Secure Boot is implemented"
sid: released (5.9.6-1)
4.19-buster-security: released (4.19.160-1)
4.9-stretch-security: ignored "Only an issue when Secure Boot is implemented"