[PATCH net-next v2 2/2] bpf: Extend check_uarg_tail_zero() checks

The function check_uarg_tail_zero() was created from bpf(2) for BPF_OBJ_GET_INFO_BY_FD without taking the access_ok() nor the PAGE_SIZE checks. Make this checks more generally available while unlikely to be triggered, extend the memory range check and add an explanation including why the ToCToU sho

Re: [PATCH net-next v2 2/2] bpf: Extend check_uarg_tail_zero() checks

From: Mickaël Salaün Date: Mon, 7 Aug 2017 20:45:20 +0200 > The function check_uarg_tail_zero() was created from bpf(2) for > BPF_OBJ_GET_INFO_BY_FD without taking the access_ok() nor the PAGE_SIZE > checks. Make this checks more generally available while unlikely to be > triggered, extend the m