This patch series adds changes in verifier to make decisions such as granting of read / write access or enforcement of return code status based on the program type of the target program while using dynamic program extension (of type BPF_PROG_TYPE_EXT).
The BPF_PROG_TYPE_EXT type can be used to extend types such as XDP, SKB and others. Since the BPF_PROG_TYPE_EXT program type on itself is just a placeholder for those, we need this extended check for those extended programs to actually work with proper access, while using this option. Patch #1 includes changes in the verifier. Patch #2 adds selftests to verify write access on a packet for a valid extension program type Patch #3 adds selftests to verify proper check for the return code Patch #4 adds selftests to ensure access permissions and restrictions for some map types such sockmap. Changelogs: v2 -> v3: * more comprehensive resolution of the program type in the verifier based on the target program (and not just for the packet access) * selftests for checking return code and map access * Also moved this patch to 'bpf-next' from 'bpf' tree v1 -> v2: * extraction of the logic to resolve prog type into a separate method * selftests to check for packet access for a valid freplace prog Udip Pant (4): bpf: verifier: use target program's type for access verifications selftests/bpf: add test for freplace program with write access selftests/bpf: test for checking return code for the extended prog selftests/bpf: test for map update access from within EXT programs kernel/bpf/verifier.c | 32 ++++++--- .../selftests/bpf/prog_tests/fexit_bpf2bpf.c | 68 +++++++++++++++++++ .../selftests/bpf/progs/fexit_bpf2bpf.c | 27 ++++++++ .../bpf/progs/freplace_attach_probe.c | 40 +++++++++++ .../bpf/progs/freplace_cls_redirect.c | 34 ++++++++++ .../bpf/progs/freplace_connect_v4_prog.c | 19 ++++++ .../selftests/bpf/progs/test_pkt_access.c | 20 ++++++ 7 files changed, 229 insertions(+), 11 deletions(-) create mode 100644 tools/testing/selftests/bpf/progs/freplace_attach_probe.c create mode 100644 tools/testing/selftests/bpf/progs/freplace_cls_redirect.c create mode 100644 tools/testing/selftests/bpf/progs/freplace_connect_v4_prog.c -- 2.24.1