[PATCH bpf-next v3 3/8] selftests/bpf: pass page size from userspace in sockopt_sk
From: Yauheni Kaliuta <hidden>
Date: 2021-03-31 16:46:20
Subsystem:
bpf [general] (safe dynamic programs and tools), bpf [selftests] (test runners & infrastructure), kernel selftest framework, the rest · Maintainers:
Alexei Starovoitov, Daniel Borkmann, Andrii Nakryiko, Eduard Zingerman, Kumar Kartikeya Dwivedi, Shuah Khan, Linus Torvalds
Since there is no convenient way for bpf program to get PAGE_SIZE from inside of the kernel, pass the value from userspace. Signed-off-by: Yauheni Kaliuta <redacted> --- tools/testing/selftests/bpf/prog_tests/sockopt_sk.c | 2 ++ tools/testing/selftests/bpf/progs/sockopt_sk.c | 10 ++++------ 2 files changed, 6 insertions(+), 6 deletions(-)
diff --git a/tools/testing/selftests/bpf/prog_tests/sockopt_sk.c b/tools/testing/selftests/bpf/prog_tests/sockopt_sk.c
index 7274b12abe17..4b937e5dbaca 100644
--- a/tools/testing/selftests/bpf/prog_tests/sockopt_sk.c
+++ b/tools/testing/selftests/bpf/prog_tests/sockopt_sk.c@@ -200,6 +200,8 @@ static void run_test(int cgroup_fd) if (!ASSERT_OK_PTR(skel, "skel_load")) goto cleanup; + skel->bss->page_size = getpagesize(); + skel->links._setsockopt = bpf_program__attach_cgroup(skel->progs._setsockopt, cgroup_fd); if (!ASSERT_OK_PTR(skel->links._setsockopt, "setsockopt_link"))
diff --git a/tools/testing/selftests/bpf/progs/sockopt_sk.c b/tools/testing/selftests/bpf/progs/sockopt_sk.c
index 978a68005966..d6d03f64e2e4 100644
--- a/tools/testing/selftests/bpf/progs/sockopt_sk.c
+++ b/tools/testing/selftests/bpf/progs/sockopt_sk.c@@ -7,9 +7,7 @@ char _license[] SEC("license") = "GPL"; -#ifndef PAGE_SIZE -#define PAGE_SIZE 4096 -#endif +int page_size; /* userspace should set it */ #ifndef SOL_TCP #define SOL_TCP IPPROTO_TCP
@@ -89,7 +87,7 @@ int _getsockopt(struct bpf_sockopt *ctx) * program can only see the first PAGE_SIZE * bytes of data. */ - if (optval_end - optval != PAGE_SIZE) + if (optval_end - optval != page_size) return 0; /* EPERM, unexpected data size */ return 1;
@@ -160,7 +158,7 @@ int _setsockopt(struct bpf_sockopt *ctx) if (ctx->level == SOL_IP && ctx->optname == IP_FREEBIND) { /* Original optlen is larger than PAGE_SIZE. */ - if (ctx->optlen != PAGE_SIZE * 2) + if (ctx->optlen != page_size * 2) return 0; /* EPERM, unexpected data size */ if (optval + 1 > optval_end)
@@ -174,7 +172,7 @@ int _setsockopt(struct bpf_sockopt *ctx) * program can only see the first PAGE_SIZE * bytes of data. */ - if (optval_end - optval != PAGE_SIZE) + if (optval_end - optval != page_size) return 0; /* EPERM, unexpected data size */ return 1;
--
2.31.1