This patch set intends to change verifier ARG_CONST_SIZE_OR_ZERO
semantics so that simpler bpf programs can be written with verifier
acceptance. Patch #1 comment provided the detailed examples and
the patch itself implements the new semantics. Patch #2
changes bpf_probe_read helper arg2 type from
ARG_CONST_SIZE to ARG_CONST_SIZE_OR_ZERO. Patch #3 fixed a few
test cases and added some for better coverage.
Changelog:
v1 -> v2:
Fix typo in commit message pointed by Sergei Shtylyov
Yonghong Song (3):
bpf: improve verifier ARG_CONST_SIZE_OR_ZERO semantics
bpf: change helper bpf_probe_read arg2 type to ARG_CONST_SIZE_OR_ZERO
bpf: fix and add test cases for ARG_CONST_SIZE_OR_ZERO semantics
change
kernel/bpf/verifier.c | 40 +++++----
kernel/trace/bpf_trace.c | 8 +-
tools/testing/selftests/bpf/test_verifier.c | 131 ++++++++++++++++++++++++----
3 files changed, 142 insertions(+), 37 deletions(-)
--
2.9.5
