Description: powerpc: Unrelated processes may be able to read/write to each other's virtual memory
References:
 https://lore.kernel.org/lkml/87lfxr82ls.fsf@concordia.ellerman.id.au/
Notes:
 carnil> bug introduced with f384796c40dc ("powerpc/mm: Add support for
 carnil> handling > 512TB address in SLB miss") (4.17-rc1).
Bugs:
upstream: released (5.2-rc7) [ca72d88378b2f2444d3ec145dd442d449d3fefbc]
4.19-upstream-stable: released (4.19.56) [cd3e49394cb0f45c8dbf3c17c0818cd3d30b1332]
4.9-upstream-stable: N/A "Vulnerable code introduced later"
3.16-upstream-stable: N/A "Vulnerable code introduced later"
sid: released (5.2.6-1)
4.19-buster-security: released (4.19.37-5+deb10u2) [bugfix/powerpc/powerpc-mm-64s-hash-Reallocate-context-ids-on-fork.patch]
4.9-stretch-security: N/A "Vulnerable code not present"
3.16-jessie-security: N/A "Vulnerable code not present"