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From: Yauheni Kaliuta <yauheni.kaliuta@redhat.com>
To: bpf@vger.kernel.org
Cc: andrii@kernel.org, jolsa@redhat.com,
	Yauheni Kaliuta <yauheni.kaliuta@redhat.com>
Subject: [PATCH bpf-next v3 3/8] selftests/bpf: pass page size from userspace in sockopt_sk
Date: Wed, 31 Mar 2021 19:44:59 +0300	[thread overview]
Message-ID: <20210331164504.320614-3-yauheni.kaliuta@redhat.com> (raw)
In-Reply-To: <20210331164504.320614-1-yauheni.kaliuta@redhat.com>

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 <yauheni.kaliuta@redhat.com>
---
 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


  parent reply	other threads:[~2021-03-31 16:46 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-31 16:44 [PATCH bpf-next v3 0/8] bpf/selftests: page size fixes Yauheni Kaliuta
2021-03-31 16:44 ` [PATCH bpf-next v3 1/8] selftests/bpf: test_progs/sockopt_sk: remove version Yauheni Kaliuta
2021-03-31 16:44   ` [PATCH bpf-next v3 2/8] selftests/bpf: test_progs/sockopt_sk: Convert to use BPF skeleton Yauheni Kaliuta
2021-03-31 16:44   ` Yauheni Kaliuta [this message]
2021-03-31 18:44     ` [PATCH bpf-next v3 3/8] selftests/bpf: pass page size from userspace in sockopt_sk Andrii Nakryiko
2021-03-31 16:45   ` [PATCH bpf-next v3 4/8] selftests/bpf: pass page size from userspace in map_ptr Yauheni Kaliuta
2021-03-31 16:45   ` [PATCH bpf-next v3 5/8] selftests/bpf: mmap: use runtime page size Yauheni Kaliuta
2021-03-31 16:45   ` [PATCH bpf-next v3 6/8] selftests/bpf: ringbuf: " Yauheni Kaliuta
2021-03-31 16:45   ` [PATCH bpf-next v3 7/8] libbpf: add bpf_map__inner_map API Yauheni Kaliuta
2021-03-31 18:48     ` Andrii Nakryiko
2021-03-31 16:45   ` [PATCH bpf-next v3 8/8] selftests/bpf: ringbuf_multi: use runtime page size Yauheni Kaliuta
2021-03-31 18:52     ` Andrii Nakryiko
2021-04-07 16:36       ` Yauheni Kaliuta
2021-04-07 18:05         ` Andrii Nakryiko
2021-04-07 18:17           ` Andrii Nakryiko
2021-04-08  5:56             ` Yauheni Kaliuta

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