Description: powerpc/32: Fix overread/overwrite of thread_struct via ptrace
References:
 https://www.openwall.com/lists/oss-security/2022/06/14/3
Notes:
 carnil> Commit fixes 87fec0514f61 ("powerpc:
 carnil> PTRACE_PEEKUSR/PTRACE_POKEUSER of FPR registers in little
 carnil> endian builds") in 3.13-rc1.
 carnil> Fixed as well in 5.18.4 for 5.18.y.
Bugs:
upstream: released (5.19-rc2) [8e1278444446fc97778a5e5c99bca1ce0bbc5ec9]
5.10-upstream-stable: released (5.10.122) [3be74fc0afbeadc2aff8dc69f3bf9716fbe66486]
4.19-upstream-stable: released (4.19.247) [a0e38a2808ea708beb4196a8873cecc23efb8e64]
4.9-upstream-stable: released (4.9.318) [89dda10b73b7ce184caf18754907126ce7ce3fad]
sid: released (5.18.5-1)
5.10-bullseye-security: ignored "no release architecture affected"
4.19-buster-security: ignored "no release architecture affected"
4.9-stretch-security: ignored "no release architecture affected"