1. Patch1 is dependent patch to fix zext extension error in 32-bit ARM. 2. Patch2 and patch3 solve the problem that the bpf check fails because load's mem size is modified in CO_RE from the kernel and user modes, Currently, there are different opinions and a final solution needs to be selected. 3. Patch4 supports bpf fkunc in 32-bit ARM for EABI. 4. Patch5 is used to add test cases to cover some parameter scenarios states by AAPCS.
The following is the test_progs result in the 32-bit ARM environment:
# uname -m armv7l # echo 1 > /proc/sys/net/core/bpf_jit_enable # ./test_progs -t kfunc_call #1/1 kfunc_call/kfunc_syscall_test_fail:OK #1/2 kfunc_call/kfunc_syscall_test_null_fail:OK #1/3 kfunc_call/kfunc_call_test_get_mem_fail_rdonly:OK #1/4 kfunc_call/kfunc_call_test_get_mem_fail_use_after_free:OK #1/5 kfunc_call/kfunc_call_test_get_mem_fail_oob:OK #1/6 kfunc_call/kfunc_call_test_get_mem_fail_not_const:OK #1/7 kfunc_call/kfunc_call_test_mem_acquire_fail:OK #1/8 kfunc_call/kfunc_call_test1:OK #1/9 kfunc_call/kfunc_call_test2:OK #1/10 kfunc_call/kfunc_call_test4:OK #1/11 kfunc_call/kfunc_call_test_ref_btf_id:OK #1/12 kfunc_call/kfunc_call_test_get_mem:OK #1/13 kfunc_call/kfunc_syscall_test:OK #1/14 kfunc_call/kfunc_syscall_test_null:OK #1/17 kfunc_call/destructive:OK
Yang Jihong (5): bpf: Adapt 32-bit return value kfunc for 32-bit ARM when zext extension bpf: Adjust sk size check for sk in bpf_skb_is_valid_access for CO_RE in 32-bit arch libbpf: Skip adjust mem size for load pointer in 32-bit arch in CO_RE bpf: Add kernel function call support in 32-bit ARM for EABI bpf:selftests: Add kfunc_call test for mixing 32-bit and 64-bit parameters
arch/arm/net/bpf_jit_32.c | 142 ++++++++++++++++++ kernel/bpf/verifier.c | 3 + net/bpf/test_run.c | 18 +++ net/core/filter.c | 8 +- tools/lib/bpf/libbpf.c | 34 ++++- .../selftests/bpf/prog_tests/kfunc_call.c | 3 + .../selftests/bpf/progs/kfunc_call_test.c | 52 +++++++ 7 files changed, 254 insertions(+), 6 deletions(-)