netdev - [PATCH bpf-next v2 6/8] bpf, samples: Use bpf_probe_read

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Date:   Thu, 31 Oct 2019 02:00:24 +0100
From:   Daniel Borkmann <daniel@...earbox.net>
To:     bpf@...r.kernel.org
Cc:     netdev@...r.kernel.org, ast@...nel.org, andrii.nakryiko@...il.com,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andriin@...com>
Subject: [PATCH bpf-next v2 6/8] bpf, samples: Use bpf_probe_read_user where appropriate

Use bpf_probe_read_user() helper instead of bpf_probe_read() for samples that
attach to kprobes probing on user addresses.

Signed-off-by: Daniel Borkmann <daniel@...earbox.net>
Acked-by: Andrii Nakryiko <andriin@...com>
---
 samples/bpf/map_perf_test_kern.c         | 4 ++--
 samples/bpf/test_map_in_map_kern.c       | 4 ++--
 samples/bpf/test_probe_write_user_kern.c | 2 +-
 3 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/samples/bpf/map_perf_test_kern.c b/samples/bpf/map_perf_test_kern.c
index 5c11aefbc489..281bcdaee58e 100644
--- a/samples/bpf/map_perf_test_kern.c
+++ b/samples/bpf/map_perf_test_kern.c
@@ -181,8 +181,8 @@ int stress_lru_hmap_alloc(struct pt_regs *ctx)
 	if (addrlen != sizeof(*in6))
 		return 0;
 
-	ret = bpf_probe_read(test_params.dst6, sizeof(test_params.dst6),
-			     &in6->sin6_addr);
+	ret = bpf_probe_read_user(test_params.dst6, sizeof(test_params.dst6),
+				  &in6->sin6_addr);
 	if (ret)
 		goto done;
 
diff --git a/samples/bpf/test_map_in_map_kern.c b/samples/bpf/test_map_in_map_kern.c
index 4f80cbe74c72..32ee752f19df 100644
--- a/samples/bpf/test_map_in_map_kern.c
+++ b/samples/bpf/test_map_in_map_kern.c
@@ -118,7 +118,7 @@ int trace_sys_connect(struct pt_regs *ctx)
 	if (addrlen != sizeof(*in6))
 		return 0;
 
-	ret = bpf_probe_read(dst6, sizeof(dst6), &in6->sin6_addr);
+	ret = bpf_probe_read_user(dst6, sizeof(dst6), &in6->sin6_addr);
 	if (ret) {
 		inline_ret = ret;
 		goto done;
@@ -129,7 +129,7 @@ int trace_sys_connect(struct pt_regs *ctx)
 
 	test_case = dst6[7];
 
-	ret = bpf_probe_read(&port, sizeof(port), &in6->sin6_port);
+	ret = bpf_probe_read_user(&port, sizeof(port), &in6->sin6_port);
 	if (ret) {
 		inline_ret = ret;
 		goto done;
diff --git a/samples/bpf/test_probe_write_user_kern.c b/samples/bpf/test_probe_write_user_kern.c
index a543358218e6..b7c48f37132c 100644
--- a/samples/bpf/test_probe_write_user_kern.c
+++ b/samples/bpf/test_probe_write_user_kern.c
@@ -37,7 +37,7 @@ int bpf_prog1(struct pt_regs *ctx)
 	if (sockaddr_len > sizeof(orig_addr))
 		return 0;
 
-	if (bpf_probe_read(&orig_addr, sizeof(orig_addr), sockaddr_arg) != 0)
+	if (bpf_probe_read_user(&orig_addr, sizeof(orig_addr), sockaddr_arg) != 0)
 		return 0;
 
 	mapped_addr = bpf_map_lookup_elem(&dnat_map, &orig_addr);
-- 
2.21.0