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selftests/bpf: Fix error reporting from sock_fields programs

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The helper macro that records an error in BPF programs that exercise sock
fields access has been inadvertently broken by adaptation work that
happened in commit b18c1f0aa4 ("bpf: selftest: Adapt sock_fields test to
use skel and global variables").

BPF_NOEXIST flag cannot be used to update BPF_MAP_TYPE_ARRAY. The operation
always fails with -EEXIST, which in turn means the error never gets
recorded, and the checks for errors always pass.

Revert the change in update flags.

Fixes: b18c1f0aa4 ("bpf: selftest: Adapt sock_fields test to use skel and global variables")
Signed-off-by: Jakub Sitnicki <jakub@cloudflare.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/bpf/20220317113920.1068535-2-jakub@cloudflare.com
This commit is contained in:
Jakub Sitnicki 2022-03-17 12:39:17 +01:00 • committed by Daniel Borkmann
parent 60911970b0
commit a4c9fe0ed4
1 changed files with 1 additions and 1 deletions
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2
tools/testing/selftests/bpf/progs/test_sock_fields.c
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@ -114,7 +114,7 @@ static void tpcpy(struct bpf_tcp_sock *dst,
#define RET_LOG() ({ \
linum = __LINE__; \
bpf_map_update_elem(&linum_map, &linum_idx, &linum, BPF_NOEXIST); \
bpf_map_update_elem(&linum_map, &linum_idx, &linum, BPF_ANY); \
return CG_OK; \
})