From: "David S. Miller" davem@davemloft.net
commit c7665702d3208b77b8e00f0699b6b88241b04360 upstream
Make it set the flag argument to bpf_verify_program() which will relax the alignment restrictions.
Now all such test cases will go properly through the verifier even on inefficient unaligned access architectures.
On inefficient unaligned access architectures do not try to run such programs, instead mark the test case as passing but annotate the result similarly to how it is done now in the presence of this flag.
So, we get complete full coverage for all REJECT test cases, and at least verifier level coverage for ACCEPT test cases.
Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Alexei Starovoitov ast@kernel.org Signed-off-by: Tiezhu Yang yangtiezhu@loongson.cn Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- tools/testing/selftests/bpf/test_verifier.c | 42 ++++++++++++++++------------ 1 file changed, 24 insertions(+), 18 deletions(-)
--- a/tools/testing/selftests/bpf/test_verifier.c +++ b/tools/testing/selftests/bpf/test_verifier.c @@ -12844,13 +12844,14 @@ out: static void do_test_single(struct bpf_test *test, bool unpriv, int *passes, int *errors) { - int fd_prog, expected_ret, reject_from_alignment; + int fd_prog, expected_ret, alignment_prevented_execution; int prog_len, prog_type = test->prog_type; struct bpf_insn *prog = test->insns; int map_fds[MAX_NR_MAPS]; const char *expected_err; uint32_t expected_val; uint32_t retval; + __u32 pflags; int i, err;
for (i = 0; i < MAX_NR_MAPS; i++) @@ -12861,9 +12862,12 @@ static void do_test_single(struct bpf_te do_test_fixup(test, prog_type, prog, map_fds); prog_len = probe_filter_length(prog);
- fd_prog = bpf_verify_program(prog_type, prog, prog_len, - test->flags & F_LOAD_WITH_STRICT_ALIGNMENT ? - BPF_F_STRICT_ALIGNMENT : 0, + pflags = 0; + if (test->flags & F_LOAD_WITH_STRICT_ALIGNMENT) + pflags |= BPF_F_STRICT_ALIGNMENT; + if (test->flags & F_NEEDS_EFFICIENT_UNALIGNED_ACCESS) + pflags |= BPF_F_ANY_ALIGNMENT; + fd_prog = bpf_verify_program(prog_type, prog, prog_len, pflags, "GPL", 0, bpf_vlog, sizeof(bpf_vlog), 1);
expected_ret = unpriv && test->result_unpriv != UNDEF ? @@ -12873,28 +12877,27 @@ static void do_test_single(struct bpf_te expected_val = unpriv && test->retval_unpriv ? test->retval_unpriv : test->retval;
- reject_from_alignment = fd_prog < 0 && - (test->flags & F_NEEDS_EFFICIENT_UNALIGNED_ACCESS) && - strstr(bpf_vlog, "misaligned"); -#ifdef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS - if (reject_from_alignment) { - printf("FAIL\nFailed due to alignment despite having efficient unaligned access: '%s'!\n", - strerror(errno)); - goto fail_log; - } -#endif + alignment_prevented_execution = 0; + if (expected_ret == ACCEPT) { - if (fd_prog < 0 && !reject_from_alignment) { + if (fd_prog < 0) { printf("FAIL\nFailed to load prog '%s'!\n", strerror(errno)); goto fail_log; } +#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS + if (fd_prog >= 0 && + (test->flags & F_NEEDS_EFFICIENT_UNALIGNED_ACCESS)) { + alignment_prevented_execution = 1; + goto test_ok; + } +#endif } else { if (fd_prog >= 0) { printf("FAIL\nUnexpected success to load!\n"); goto fail_log; } - if (!strstr(bpf_vlog, expected_err) && !reject_from_alignment) { + if (!strstr(bpf_vlog, expected_err)) { printf("FAIL\nUnexpected error message!\n\tEXP: %s\n\tRES: %s\n", expected_err, bpf_vlog); goto fail_log; @@ -12922,9 +12925,12 @@ static void do_test_single(struct bpf_te goto fail_log; } } +#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS +test_ok: +#endif (*passes)++; - printf("OK%s\n", reject_from_alignment ? - " (NOTE: reject due to unknown alignment)" : ""); + printf("OK%s\n", alignment_prevented_execution ? + " (NOTE: not executed due to unknown alignment)" : ""); close_fds: close(fd_prog); for (i = 0; i < MAX_NR_MAPS; i++)