linux-kernel - [PATCH bpf-next v5 3/3] selftests/bpf: Skip callback tests if jit is disabled in test

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Message-ID: <20240117111000.12763-4-yangtiezhu@loongson.cn>
Date: Wed, 17 Jan 2024 19:10:00 +0800
From: Tiezhu Yang <yangtiezhu@...ngson.cn>
To: Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Andrii Nakryiko <andrii@...nel.org>
Cc: Eduard Zingerman <eddyz87@...il.com>,
	John Fastabend <john.fastabend@...il.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Hou Tao <houtao@...weicloud.com>,
	Song Liu <song@...nel.org>,
	bpf@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH bpf-next v5 3/3] selftests/bpf: Skip callback tests if jit is disabled in  test_verifier

If CONFIG_BPF_JIT_ALWAYS_ON is not set and bpf_jit_enable is 0, there
exist 6 failed tests.

  [root@...ux bpf]# echo 0 > /proc/sys/net/core/bpf_jit_enable
  [root@...ux bpf]# echo 0 > /proc/sys/kernel/unprivileged_bpf_disabled
  [root@...ux bpf]# ./test_verifier | grep FAIL
  #106/p inline simple bpf_loop call FAIL
  #107/p don't inline bpf_loop call, flags non-zero FAIL
  #108/p don't inline bpf_loop call, callback non-constant FAIL
  #109/p bpf_loop_inline and a dead func FAIL
  #110/p bpf_loop_inline stack locations for loop vars FAIL
  #111/p inline bpf_loop call in a big program FAIL
  Summary: 768 PASSED, 15 SKIPPED, 6 FAILED

The test log shows that callbacks are not allowed in non-JITed programs,
interpreter doesn't support them yet, thus these tests should be skipped
if jit is disabled, just handle this case in do_test_single().

After including bpf/libbpf_internal.h, there exist some build errors:

  error: attempt to use poisoned "u32"
  error: attempt to use poisoned "u64"

replace u32 and u64 with __u32 and __u64 to fix them.

With this patch:

  [root@...ux bpf]# echo 0 > /proc/sys/net/core/bpf_jit_enable
  [root@...ux bpf]# echo 0 > /proc/sys/kernel/unprivileged_bpf_disabled
  [root@...ux bpf]# ./test_verifier | grep FAIL
  Summary: 768 PASSED, 21 SKIPPED, 0 FAILED

Signed-off-by: Tiezhu Yang <yangtiezhu@...ngson.cn>
Acked-by: Hou Tao <houtao1@...wei.com>
---
 tools/testing/selftests/bpf/test_verifier.c | 20 +++++++++++++++++---
 1 file changed, 17 insertions(+), 3 deletions(-)

diff --git a/tools/testing/selftests/bpf/test_verifier.c b/tools/testing/selftests/bpf/test_verifier.c
index 1a09fc34d093..c7f57b5b04a7 100644
--- a/tools/testing/selftests/bpf/test_verifier.c
+++ b/tools/testing/selftests/bpf/test_verifier.c
@@ -41,6 +41,7 @@
 #include "test_btf.h"
 #include "../../../include/linux/filter.h"
 #include "testing_helpers.h"
+#include "bpf/libbpf_internal.h"
 
 #ifndef ENOTSUPP
 #define ENOTSUPP 524
@@ -74,6 +75,7 @@
 		    1ULL << CAP_BPF)
 #define UNPRIV_SYSCTL "kernel/unprivileged_bpf_disabled"
 static bool unpriv_disabled = false;
+static bool jit_disabled;
 static int skips;
 static bool verbose = false;
 static int verif_log_level = 0;
@@ -1143,8 +1145,8 @@ static void do_test_fixup(struct bpf_test *test, enum bpf_prog_type prog_type,
 		} while (*fixup_map_xskmap);
 	}
 	if (*fixup_map_stacktrace) {
-		map_fds[12] = create_map(BPF_MAP_TYPE_STACK_TRACE, sizeof(u32),
-					 sizeof(u64), 1);
+		map_fds[12] = create_map(BPF_MAP_TYPE_STACK_TRACE, sizeof(__u32),
+					 sizeof(__u64), 1);
 		do {
 			prog[*fixup_map_stacktrace].imm = map_fds[12];
 			fixup_map_stacktrace++;
@@ -1203,7 +1205,7 @@ static void do_test_fixup(struct bpf_test *test, enum bpf_prog_type prog_type,
 	}
 	if (*fixup_map_reuseport_array) {
 		map_fds[19] = __create_map(BPF_MAP_TYPE_REUSEPORT_SOCKARRAY,
-					   sizeof(u32), sizeof(u64), 1, 0);
+					   sizeof(__u32), sizeof(__u64), 1, 0);
 		do {
 			prog[*fixup_map_reuseport_array].imm = map_fds[19];
 			fixup_map_reuseport_array++;
@@ -1622,6 +1624,16 @@ static void do_test_single(struct bpf_test *test, bool unpriv,
 	alignment_prevented_execution = 0;
 
 	if (expected_ret == ACCEPT || expected_ret == VERBOSE_ACCEPT) {
+		if (fd_prog < 0 && saved_errno == EINVAL && jit_disabled) {
+			for (i = 0; i < prog_len; i++, prog++) {
+				if (!insn_is_pseudo_func(prog))
+					continue;
+				printf("SKIP (callbacks are not allowed in non-JITed programs)\n");
+				skips++;
+				goto close_fds;
+			}
+		}
+
 		if (fd_prog < 0) {
 			printf("FAIL\nFailed to load prog '%s'!\n",
 			       strerror(saved_errno));
@@ -1844,6 +1856,8 @@ int main(int argc, char **argv)
 		return EXIT_FAILURE;
 	}
 
+	jit_disabled = !is_jit_enabled();
+
 	/* Use libbpf 1.0 API mode */
 	libbpf_set_strict_mode(LIBBPF_STRICT_ALL);
 
-- 
2.42.0