[PATCH bpf-next v2 0/2] bpf: Build with -Wcast-function-type

Kees Cook
2021-09-28T23:10:06Z

Hi,

In order to keep ahead of cases in the kernel where Control Flow Integrity
(CFI) may trip over function call casts, enabling -Wcast-function-type
is helpful. To that end, replace BPF_CAST_CALL() as it triggers warnings
with this option and is now one of the last places in the kernel in need
of fixing.

Thanks,

-Kees

v2:
- rebase to bpf-next
- add acks
v1: https://lore.kernel.org/lkml/20210927182700.2980499-1-keescook@chromium.org

Kees Cook (2):
bpf: Replace "want address" users of BPF_CAST_CALL with BPF_CALL_IMM
bpf: Replace callers of BPF_CAST_CALL with proper function typedef

include/linux/bpf.h | 4 +++-
include/linux/filter.h | 7 +++----
kernel/bpf/arraymap.c | 7 +++----
kernel/bpf/hashtab.c | 13 ++++++-------
kernel/bpf/helpers.c | 5 ++---
kernel/bpf/verifier.c | 26 +++++++++-----------------
lib/test_bpf.c | 2 +-
7 files changed, 27 insertions(+), 37 deletions(-)

--
2.30.2