From: Andrii Nakryiko <andrii@kernel.org>
To: <bpf@vger.kernel.org>, <ast@kernel.org>, <daniel@iogearbox.net>
Cc: <andrii@kernel.org>, <kernel-team@fb.com>
Subject: [PATCH bpf-next 12/13] selftests/bpf: fix misaligned memory accesses in xdp_bonding test
Date: Tue, 23 Nov 2021 16:23:24 -0800 [thread overview]
Message-ID: <20211124002325.1737739-13-andrii@kernel.org> (raw)
In-Reply-To: <20211124002325.1737739-1-andrii@kernel.org>
Construct packet buffer explicitly for each packet to avoid unaligned
memory accesses.
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
---
.../selftests/bpf/prog_tests/xdp_bonding.c | 36 ++++++++++---------
1 file changed, 20 insertions(+), 16 deletions(-)
diff --git a/tools/testing/selftests/bpf/prog_tests/xdp_bonding.c b/tools/testing/selftests/bpf/prog_tests/xdp_bonding.c
index faa22b84f2ee..5e3a26b15ec6 100644
--- a/tools/testing/selftests/bpf/prog_tests/xdp_bonding.c
+++ b/tools/testing/selftests/bpf/prog_tests/xdp_bonding.c
@@ -218,9 +218,9 @@ static int send_udp_packets(int vary_dst_ip)
.h_dest = BOND2_MAC,
.h_proto = htons(ETH_P_IP),
};
- uint8_t buf[128] = {};
- struct iphdr *iph = (struct iphdr *)(buf + sizeof(eh));
- struct udphdr *uh = (struct udphdr *)(buf + sizeof(eh) + sizeof(*iph));
+ struct iphdr iph = {};
+ struct udphdr uh = {};
+ uint8_t buf[128];
int i, s = -1;
int ifindex;
@@ -232,17 +232,16 @@ static int send_udp_packets(int vary_dst_ip)
if (!ASSERT_GT(ifindex, 0, "get bond1 ifindex"))
goto err;
- memcpy(buf, &eh, sizeof(eh));
- iph->ihl = 5;
- iph->version = 4;
- iph->tos = 16;
- iph->id = 1;
- iph->ttl = 64;
- iph->protocol = IPPROTO_UDP;
- iph->saddr = 1;
- iph->daddr = 2;
- iph->tot_len = htons(sizeof(buf) - ETH_HLEN);
- iph->check = 0;
+ iph.ihl = 5;
+ iph.version = 4;
+ iph.tos = 16;
+ iph.id = 1;
+ iph.ttl = 64;
+ iph.protocol = IPPROTO_UDP;
+ iph.saddr = 1;
+ iph.daddr = 2;
+ iph.tot_len = htons(sizeof(buf) - ETH_HLEN);
+ iph.check = 0;
for (i = 1; i <= NPACKETS; i++) {
int n;
@@ -253,10 +252,15 @@ static int send_udp_packets(int vary_dst_ip)
};
/* vary the UDP destination port for even distribution with roundrobin/xor modes */
- uh->dest++;
+ uh.dest++;
if (vary_dst_ip)
- iph->daddr++;
+ iph.daddr++;
+
+ /* construct a packet */
+ memcpy(buf, &eh, sizeof(eh));
+ memcpy(buf + sizeof(eh), &iph, sizeof(iph));
+ memcpy(buf + sizeof(eh) + sizeof(iph), &uh, sizeof(uh));
n = sendto(s, buf, sizeof(buf), 0, (struct sockaddr *)&saddr_ll, sizeof(saddr_ll));
if (!ASSERT_EQ(n, sizeof(buf), "sendto"))
--
2.30.2
next prev parent reply other threads:[~2021-11-24 0:23 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-24 0:23 [PATCH bpf-next 00/13] Fix sanitizer-reported libbpf and selftest issues Andrii Nakryiko
2021-11-24 0:23 ` [PATCH bpf-next 01/13] tools/resolve_btf_ids: close ELF file on error Andrii Nakryiko
2021-11-24 0:23 ` [PATCH bpf-next 02/13] libbpf: fix potential misaligned memory access in btf_ext__new() Andrii Nakryiko
2021-11-24 0:23 ` [PATCH bpf-next 03/13] libbpf: prevent UBSan from complaining about integer overflow Andrii Nakryiko
2021-11-25 22:21 ` Daniel Borkmann
2021-11-25 23:19 ` Daniel Borkmann
2021-11-26 1:23 ` Andrii Nakryiko
2021-11-24 0:23 ` [PATCH bpf-next 04/13] libbpf: don't call libc APIs with NULL pointers Andrii Nakryiko
2021-11-24 0:23 ` [PATCH bpf-next 05/13] libbpf: fix glob_syms memory leak in bpf_linker Andrii Nakryiko
2021-11-24 0:23 ` [PATCH bpf-next 06/13] libbpf: fix using invalidated memory " Andrii Nakryiko
2021-11-24 0:23 ` [PATCH bpf-next 07/13] selftests/bpf: fix UBSan complaint about signed __int128 overflow Andrii Nakryiko
2021-11-24 0:23 ` [PATCH bpf-next 08/13] selftests/bpf: fix possible NULL passed to memcpy() with zero size Andrii Nakryiko
2021-11-24 0:23 ` [PATCH bpf-next 09/13] selftests/bpf: prevent misaligned memory access in get_stack_raw_tp test Andrii Nakryiko
2021-11-24 0:23 ` [PATCH bpf-next 10/13] selftests/bpf: fix misaligned memory access in queue_stack_map test Andrii Nakryiko
2021-11-24 0:23 ` [PATCH bpf-next 11/13] selftests/bpf: prevent out-of-bounds stack access in test_bpffs Andrii Nakryiko
2021-11-24 0:23 ` Andrii Nakryiko [this message]
2021-11-24 0:23 ` [PATCH bpf-next 13/13] selftests/bpf: fix misaligned accesses in xdp and xdp_bpf2bpf tests Andrii Nakryiko
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