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selftests/bpf: Test subprog jit when toggle bpf_jit_harden repeatedly 

When bpf_jit_harden is toggled between 0 and 2, subprog jit may fail
due to inconsistent twice read values of bpf_jit_harden during jit. So
add a test to ensure the problem is fixed.

Signed-off-by: Hou Tao <houtao1@huawei.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20220309123321.2400262-5-houtao1@huawei.com
This commit is contained in:
Hou Tao 2022-03-09 20:33:21 +08:00 committed by Alexei Starovoitov
parent d2a3b7c5be
commit ad13baf456
1 changed files with 68 additions and 9 deletions
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77
tools/testing/selftests/bpf/prog_tests/subprogs.c
View File

@ -1,32 +1,83 @@
// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2020 Facebook */
#include <test_progs.h>
#include <time.h>
#include "test_subprogs.skel.h"
#include "test_subprogs_unused.skel.h"
static int duration;
struct toggler_ctx {
int fd;
bool stop;
};
void test_subprogs(void)
static void *toggle_jit_harden(void *arg)
{
struct toggler_ctx *ctx = arg;
char two = '2';
char zero = '0';
while (!ctx->stop) {
lseek(ctx->fd, SEEK_SET, 0);
write(ctx->fd, &two, sizeof(two));
lseek(ctx->fd, SEEK_SET, 0);
write(ctx->fd, &zero, sizeof(zero));
}
return NULL;
}
static void test_subprogs_with_jit_harden_toggling(void)
{
struct toggler_ctx ctx;
pthread_t toggler;
int err;
unsigned int i, loop = 10;
ctx.fd = open("/proc/sys/net/core/bpf_jit_harden", O_RDWR);
if (!ASSERT_GE(ctx.fd, 0, "open bpf_jit_harden"))
return;
ctx.stop = false;
err = pthread_create(&toggler, NULL, toggle_jit_harden, &ctx);
if (!ASSERT_OK(err, "new toggler"))
goto out;
/* Make toggler thread to run */
usleep(1);
for (i = 0; i < loop; i++) {
struct test_subprogs *skel = test_subprogs__open_and_load();
if (!ASSERT_OK_PTR(skel, "skel open"))
break;
test_subprogs__destroy(skel);
}
ctx.stop = true;
pthread_join(toggler, NULL);
out:
close(ctx.fd);
}
static void test_subprogs_alone(void)
{
struct test_subprogs *skel;
struct test_subprogs_unused *skel2;
int err;
skel = test_subprogs__open_and_load();
if (CHECK(!skel, "skel_open", "failed to open skeleton\n"))
if (!ASSERT_OK_PTR(skel, "skel_open"))
return;
err = test_subprogs__attach(skel);
if (CHECK(err, "skel_attach", "failed to attach skeleton: %d\n", err))
if (!ASSERT_OK(err, "skel attach"))
goto cleanup;
usleep(1);
CHECK(skel->bss->res1 != 12, "res1", "got %d, exp %d\n", skel->bss->res1, 12);
CHECK(skel->bss->res2 != 17, "res2", "got %d, exp %d\n", skel->bss->res2, 17);
CHECK(skel->bss->res3 != 19, "res3", "got %d, exp %d\n", skel->bss->res3, 19);
CHECK(skel->bss->res4 != 36, "res4", "got %d, exp %d\n", skel->bss->res4, 36);
ASSERT_EQ(skel->bss->res1, 12, "res1");
ASSERT_EQ(skel->bss->res2, 17, "res2");
ASSERT_EQ(skel->bss->res3, 19, "res3");
ASSERT_EQ(skel->bss->res4, 36, "res4");
skel2 = test_subprogs_unused__open_and_load();
ASSERT_OK_PTR(skel2, "unused_progs_skel");
@ -35,3 +86,11 @@ void test_subprogs(void)
cleanup:
test_subprogs__destroy(skel);
}
void test_subprogs(void)
{
if (test__start_subtest("subprogs_alone"))
test_subprogs_alone();
if (test__start_subtest("subprogs_and_jit_harden"))
test_subprogs_with_jit_harden_toggling();
}