• Jiong Wang's avatar
    selftests: bpf: enable hi32 randomization for all tests · 9d120b41
    Jiong Wang authored
    The previous libbpf patch allows user to specify "prog_flags" to bpf
    program load APIs. To enable high 32-bit randomization for a test, we need
    to set BPF_F_TEST_RND_HI32 in "prog_flags".
    
    To enable such randomization for all tests, we need to make sure all places
    are passing BPF_F_TEST_RND_HI32. Changing them one by one is not
    convenient, also, it would be better if a test could be switched to
    "normal" running mode without code change.
    
    Given the program load APIs used across bpf selftests are mostly:
      bpf_prog_load:      load from file
      bpf_load_program:   load from raw insns
    
    A test_stub.c is implemented for bpf seltests, it offers two functions for
    testing purpose:
    
      bpf_prog_test_load
      bpf_test_load_program
    
    The are the same as "bpf_prog_load" and "bpf_load_program", except they
    also set BPF_F_TEST_RND_HI32. Given *_xattr functions are the APIs to
    customize any "prog_flags", it makes little sense to put these two
    functions into libbpf.
    
    Then, the following CFLAGS are passed to compilations for host programs:
      -Dbpf_prog_load=bpf_prog_test_load
      -Dbpf_load_program=bpf_test_load_program
    
    They migrate the used load APIs to the test version, hence enable high
    32-bit randomization for these tests without changing source code.
    
    Besides all these, there are several testcases are using
    "bpf_prog_load_attr" directly, their call sites are updated to pass
    BPF_F_TEST_RND_HI32.
    Signed-off-by: default avatarJiong Wang <jiong.wang@netronome.com>
    Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
    9d120b41
Makefile 8.67 KB