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linux/tools/testing/selftests/bpf/prog_tests/recursion.c

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selftest/bpf: Add a recursion test Add recursive non-sleepable fentry program as a test. All attach points where sleepable progs can execute are non recursive so far. The recursion protection mechanism for sleepable cannot be activated yet. Signed-off-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/bpf/20210210033634.62081-6-alexei.starovoitov@gmail.com
2021-02-09 19:36:30 -08:00
// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2021 Facebook */
#include <test_progs.h>
#include "recursion.skel.h"
void test_recursion(void)
{
selftests/bpf: Improve recursion selftest Since recursion_misses counter is available in bpf_prog_info improve the selftest to make sure it's counting correctly. Signed-off-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Link: https://lore.kernel.org/bpf/20210210033634.62081-8-alexei.starovoitov@gmail.com
2021-02-09 19:36:32 -08:00
struct bpf_prog_info prog_info = {};
__u32 prog_info_len = sizeof(prog_info);
selftest/bpf: Add a recursion test Add recursive non-sleepable fentry program as a test. All attach points where sleepable progs can execute are non recursive so far. The recursion protection mechanism for sleepable cannot be activated yet. Signed-off-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/bpf/20210210033634.62081-6-alexei.starovoitov@gmail.com
2021-02-09 19:36:30 -08:00
struct recursion *skel;
int key = 0;
int err;
skel = recursion__open_and_load();
if (!ASSERT_OK_PTR(skel, "skel_open_and_load"))
return;
err = recursion__attach(skel);
if (!ASSERT_OK(err, "skel_attach"))
goto out;
ASSERT_EQ(skel->bss->pass1, 0, "pass1 == 0");
selftest/bpf: Switch recursion test to use htab_map_delete_elem Currently the recursion test is hooking __htab_map_lookup_elem function, which is invoked both from bpf_prog and bpf syscall. But in our kernel build, the __htab_map_lookup_elem gets inlined within the htab_map_lookup_elem, so it's not trigered and the test fails. Fixing this by using htab_map_delete_elem, which is not inlined for bpf_prog calls (like htab_map_lookup_elem is) and is used directly as pointer for map_delete_elem, so it won't disappear by inlining. Signed-off-by: Jiri Olsa <jolsa@kernel.org> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Acked-by: Song Liu <songliubraving@fb.com> Link: https://lore.kernel.org/bpf/YVnfFTL/3T6jOwHI@krava
2021-10-03 18:49:25 +02:00
bpf_map_delete_elem(bpf_map__fd(skel->maps.hash1), &key);
selftest/bpf: Add a recursion test Add recursive non-sleepable fentry program as a test. All attach points where sleepable progs can execute are non recursive so far. The recursion protection mechanism for sleepable cannot be activated yet. Signed-off-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/bpf/20210210033634.62081-6-alexei.starovoitov@gmail.com
2021-02-09 19:36:30 -08:00
ASSERT_EQ(skel->bss->pass1, 1, "pass1 == 1");
selftest/bpf: Switch recursion test to use htab_map_delete_elem Currently the recursion test is hooking __htab_map_lookup_elem function, which is invoked both from bpf_prog and bpf syscall. But in our kernel build, the __htab_map_lookup_elem gets inlined within the htab_map_lookup_elem, so it's not trigered and the test fails. Fixing this by using htab_map_delete_elem, which is not inlined for bpf_prog calls (like htab_map_lookup_elem is) and is used directly as pointer for map_delete_elem, so it won't disappear by inlining. Signed-off-by: Jiri Olsa <jolsa@kernel.org> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Acked-by: Song Liu <songliubraving@fb.com> Link: https://lore.kernel.org/bpf/YVnfFTL/3T6jOwHI@krava
2021-10-03 18:49:25 +02:00
bpf_map_delete_elem(bpf_map__fd(skel->maps.hash1), &key);
selftest/bpf: Add a recursion test Add recursive non-sleepable fentry program as a test. All attach points where sleepable progs can execute are non recursive so far. The recursion protection mechanism for sleepable cannot be activated yet. Signed-off-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/bpf/20210210033634.62081-6-alexei.starovoitov@gmail.com
2021-02-09 19:36:30 -08:00
ASSERT_EQ(skel->bss->pass1, 2, "pass1 == 2");
ASSERT_EQ(skel->bss->pass2, 0, "pass2 == 0");
selftest/bpf: Switch recursion test to use htab_map_delete_elem Currently the recursion test is hooking __htab_map_lookup_elem function, which is invoked both from bpf_prog and bpf syscall. But in our kernel build, the __htab_map_lookup_elem gets inlined within the htab_map_lookup_elem, so it's not trigered and the test fails. Fixing this by using htab_map_delete_elem, which is not inlined for bpf_prog calls (like htab_map_lookup_elem is) and is used directly as pointer for map_delete_elem, so it won't disappear by inlining. Signed-off-by: Jiri Olsa <jolsa@kernel.org> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Acked-by: Song Liu <songliubraving@fb.com> Link: https://lore.kernel.org/bpf/YVnfFTL/3T6jOwHI@krava
2021-10-03 18:49:25 +02:00
bpf_map_delete_elem(bpf_map__fd(skel->maps.hash2), &key);
selftest/bpf: Add a recursion test Add recursive non-sleepable fentry program as a test. All attach points where sleepable progs can execute are non recursive so far. The recursion protection mechanism for sleepable cannot be activated yet. Signed-off-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/bpf/20210210033634.62081-6-alexei.starovoitov@gmail.com
2021-02-09 19:36:30 -08:00
ASSERT_EQ(skel->bss->pass2, 1, "pass2 == 1");
selftest/bpf: Switch recursion test to use htab_map_delete_elem Currently the recursion test is hooking __htab_map_lookup_elem function, which is invoked both from bpf_prog and bpf syscall. But in our kernel build, the __htab_map_lookup_elem gets inlined within the htab_map_lookup_elem, so it's not trigered and the test fails. Fixing this by using htab_map_delete_elem, which is not inlined for bpf_prog calls (like htab_map_lookup_elem is) and is used directly as pointer for map_delete_elem, so it won't disappear by inlining. Signed-off-by: Jiri Olsa <jolsa@kernel.org> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Acked-by: Song Liu <songliubraving@fb.com> Link: https://lore.kernel.org/bpf/YVnfFTL/3T6jOwHI@krava
2021-10-03 18:49:25 +02:00
bpf_map_delete_elem(bpf_map__fd(skel->maps.hash2), &key);
selftest/bpf: Add a recursion test Add recursive non-sleepable fentry program as a test. All attach points where sleepable progs can execute are non recursive so far. The recursion protection mechanism for sleepable cannot be activated yet. Signed-off-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/bpf/20210210033634.62081-6-alexei.starovoitov@gmail.com
2021-02-09 19:36:30 -08:00
ASSERT_EQ(skel->bss->pass2, 2, "pass2 == 2");
selftests/bpf: Improve recursion selftest Since recursion_misses counter is available in bpf_prog_info improve the selftest to make sure it's counting correctly. Signed-off-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Link: https://lore.kernel.org/bpf/20210210033634.62081-8-alexei.starovoitov@gmail.com
2021-02-09 19:36:32 -08:00
selftest/bpf: Switch recursion test to use htab_map_delete_elem Currently the recursion test is hooking __htab_map_lookup_elem function, which is invoked both from bpf_prog and bpf syscall. But in our kernel build, the __htab_map_lookup_elem gets inlined within the htab_map_lookup_elem, so it's not trigered and the test fails. Fixing this by using htab_map_delete_elem, which is not inlined for bpf_prog calls (like htab_map_lookup_elem is) and is used directly as pointer for map_delete_elem, so it won't disappear by inlining. Signed-off-by: Jiri Olsa <jolsa@kernel.org> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Acked-by: Song Liu <songliubraving@fb.com> Link: https://lore.kernel.org/bpf/YVnfFTL/3T6jOwHI@krava
2021-10-03 18:49:25 +02:00
err = bpf_obj_get_info_by_fd(bpf_program__fd(skel->progs.on_delete),
selftests/bpf: Improve recursion selftest Since recursion_misses counter is available in bpf_prog_info improve the selftest to make sure it's counting correctly. Signed-off-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Link: https://lore.kernel.org/bpf/20210210033634.62081-8-alexei.starovoitov@gmail.com
2021-02-09 19:36:32 -08:00
&prog_info, &prog_info_len);
if (!ASSERT_OK(err, "get_prog_info"))
goto out;
ASSERT_EQ(prog_info.recursion_misses, 2, "recursion_misses");
selftest/bpf: Add a recursion test Add recursive non-sleepable fentry program as a test. All attach points where sleepable progs can execute are non recursive so far. The recursion protection mechanism for sleepable cannot be activated yet. Signed-off-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/bpf/20210210033634.62081-6-alexei.starovoitov@gmail.com
2021-02-09 19:36:30 -08:00
out:
recursion__destroy(skel);
}
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