diff --git a/tools/testing/selftests/bpf/progs/bpf_misc.h b/tools/testing/selftests/bpf/progs/bpf_misc.h index 81097a3f15eb56..a70939c7bc26ba 100644 --- a/tools/testing/selftests/bpf/progs/bpf_misc.h +++ b/tools/testing/selftests/bpf/progs/bpf_misc.h @@ -26,6 +26,9 @@ * * __regex Same as __msg, but using a regular expression. * __regex_unpriv Same as __msg_unpriv but using a regular expression. + * __xlated Expect a line in a disassembly log after verifier applies rewrites. + * Multiple __xlated attributes could be specified. + * __xlated_unpriv Same as __xlated but for unprivileged mode. * * __success Expect program load success in privileged mode. * __success_unpriv Expect program load success in unprivileged mode. @@ -63,11 +66,13 @@ */ #define __msg(msg) __attribute__((btf_decl_tag("comment:test_expect_msg=" msg))) #define __regex(regex) __attribute__((btf_decl_tag("comment:test_expect_regex=" regex))) +#define __xlated(msg) __attribute__((btf_decl_tag("comment:test_expect_xlated=" msg))) #define __failure __attribute__((btf_decl_tag("comment:test_expect_failure"))) #define __success __attribute__((btf_decl_tag("comment:test_expect_success"))) #define __description(desc) __attribute__((btf_decl_tag("comment:test_description=" desc))) #define __msg_unpriv(msg) __attribute__((btf_decl_tag("comment:test_expect_msg_unpriv=" msg))) #define __regex_unpriv(regex) __attribute__((btf_decl_tag("comment:test_expect_regex_unpriv=" regex))) +#define __xlated_unpriv(msg) __attribute__((btf_decl_tag("comment:test_expect_xlated_unpriv=" msg))) #define __failure_unpriv __attribute__((btf_decl_tag("comment:test_expect_failure_unpriv"))) #define __success_unpriv __attribute__((btf_decl_tag("comment:test_expect_success_unpriv"))) #define __log_level(lvl) __attribute__((btf_decl_tag("comment:test_log_level="#lvl))) diff --git a/tools/testing/selftests/bpf/test_loader.c b/tools/testing/selftests/bpf/test_loader.c index 3f84903558dd83..b44b6a2fc82ce9 100644 --- a/tools/testing/selftests/bpf/test_loader.c +++ b/tools/testing/selftests/bpf/test_loader.c @@ -7,6 +7,7 @@ #include #include "autoconf_helper.h" +#include "disasm_helpers.h" #include "unpriv_helpers.h" #include "cap_helpers.h" @@ -19,10 +20,12 @@ #define TEST_TAG_EXPECT_SUCCESS "comment:test_expect_success" #define TEST_TAG_EXPECT_MSG_PFX "comment:test_expect_msg=" #define TEST_TAG_EXPECT_REGEX_PFX "comment:test_expect_regex=" +#define TEST_TAG_EXPECT_XLATED_PFX "comment:test_expect_xlated=" #define TEST_TAG_EXPECT_FAILURE_UNPRIV "comment:test_expect_failure_unpriv" #define TEST_TAG_EXPECT_SUCCESS_UNPRIV "comment:test_expect_success_unpriv" #define TEST_TAG_EXPECT_MSG_PFX_UNPRIV "comment:test_expect_msg_unpriv=" #define TEST_TAG_EXPECT_REGEX_PFX_UNPRIV "comment:test_expect_regex_unpriv=" +#define TEST_TAG_EXPECT_XLATED_PFX_UNPRIV "comment:test_expect_xlated_unpriv=" #define TEST_TAG_LOG_LEVEL_PFX "comment:test_log_level=" #define TEST_TAG_PROG_FLAGS_PFX "comment:test_prog_flags=" #define TEST_TAG_DESCRIPTION_PFX "comment:test_description=" @@ -64,6 +67,7 @@ struct test_subspec { char *name; bool expect_failure; struct expected_msgs expect_msgs; + struct expected_msgs expect_xlated; int retval; bool execute; }; @@ -117,6 +121,8 @@ static void free_test_spec(struct test_spec *spec) /* Deallocate expect_msgs arrays. */ free_msgs(&spec->priv.expect_msgs); free_msgs(&spec->unpriv.expect_msgs); + free_msgs(&spec->priv.expect_xlated); + free_msgs(&spec->unpriv.expect_xlated); free(spec->priv.name); free(spec->unpriv.name); @@ -299,6 +305,18 @@ static int parse_test_spec(struct test_loader *tester, if (err) goto cleanup; spec->mode_mask |= UNPRIV; + } else if (str_has_pfx(s, TEST_TAG_EXPECT_XLATED_PFX)) { + msg = s + sizeof(TEST_TAG_EXPECT_XLATED_PFX) - 1; + err = push_msg(msg, NULL, &spec->priv.expect_xlated); + if (err) + goto cleanup; + spec->mode_mask |= PRIV; + } else if (str_has_pfx(s, TEST_TAG_EXPECT_XLATED_PFX_UNPRIV)) { + msg = s + sizeof(TEST_TAG_EXPECT_XLATED_PFX_UNPRIV) - 1; + err = push_msg(msg, NULL, &spec->unpriv.expect_xlated); + if (err) + goto cleanup; + spec->mode_mask |= UNPRIV; } else if (str_has_pfx(s, TEST_TAG_RETVAL_PFX)) { val = s + sizeof(TEST_TAG_RETVAL_PFX) - 1; err = parse_retval(val, &spec->priv.retval, "__retval"); @@ -402,6 +420,16 @@ static int parse_test_spec(struct test_loader *tester, goto cleanup; } } + if (spec->unpriv.expect_xlated.cnt == 0) { + for (i = 0; i < spec->priv.expect_xlated.cnt; i++) { + struct expect_msg *msg = &spec->priv.expect_xlated.patterns[i]; + + err = push_msg(msg->substr, msg->regex_str, + &spec->unpriv.expect_xlated); + if (err) + goto cleanup; + } + } } spec->valid = true; @@ -449,7 +477,15 @@ static void emit_verifier_log(const char *log_buf, bool force) fprintf(stdout, "VERIFIER LOG:\n=============\n%s=============\n", log_buf); } -static void validate_msgs(char *log_buf, struct expected_msgs *msgs) +static void emit_xlated(const char *xlated, bool force) +{ + if (!force && env.verbosity == VERBOSE_NONE) + return; + fprintf(stdout, "XLATED:\n=============\n%s=============\n", xlated); +} + +static void validate_msgs(char *log_buf, struct expected_msgs *msgs, + void (*emit_fn)(const char *buf, bool force)) { regmatch_t reg_match[1]; const char *log = log_buf; @@ -473,7 +509,7 @@ static void validate_msgs(char *log_buf, struct expected_msgs *msgs) if (!ASSERT_OK_PTR(match, "expect_msg")) { if (env.verbosity == VERBOSE_NONE) - emit_verifier_log(log_buf, true /*force*/); + emit_fn(log_buf, true /*force*/); for (j = 0; j <= i; j++) { msg = &msgs->patterns[j]; fprintf(stderr, "%s %s: '%s'\n", @@ -610,6 +646,37 @@ static bool should_do_test_run(struct test_spec *spec, struct test_subspec *subs return true; } +/* Get a disassembly of BPF program after verifier applies all rewrites */ +static int get_xlated_program_text(int prog_fd, char *text, size_t text_sz) +{ + struct bpf_insn *insn_start = NULL, *insn, *insn_end; + __u32 insns_cnt = 0, i; + char buf[64]; + FILE *out = NULL; + int err; + + err = get_xlated_program(prog_fd, &insn_start, &insns_cnt); + if (!ASSERT_OK(err, "get_xlated_program")) + goto out; + out = fmemopen(text, text_sz, "w"); + if (!ASSERT_OK_PTR(out, "open_memstream")) + goto out; + insn_end = insn_start + insns_cnt; + insn = insn_start; + while (insn < insn_end) { + i = insn - insn_start; + insn = disasm_insn(insn, buf, sizeof(buf)); + fprintf(out, "%d: %s\n", i, buf); + } + fflush(out); + +out: + free(insn_start); + if (out) + fclose(out); + return err; +} + /* this function is forced noinline and has short generic name to look better * in test_progs output (in case of a failure) */ @@ -695,7 +762,16 @@ void run_subtest(struct test_loader *tester, } } emit_verifier_log(tester->log_buf, false /*force*/); - validate_msgs(tester->log_buf, &subspec->expect_msgs); + validate_msgs(tester->log_buf, &subspec->expect_msgs, emit_verifier_log); + + if (subspec->expect_xlated.cnt) { + err = get_xlated_program_text(bpf_program__fd(tprog), + tester->log_buf, tester->log_buf_sz); + if (err) + goto tobj_cleanup; + emit_xlated(tester->log_buf, false /*force*/); + validate_msgs(tester->log_buf, &subspec->expect_xlated, emit_xlated); + } if (should_do_test_run(spec, subspec)) { /* For some reason test_verifier executes programs