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From 5338636cd9ae7f53ed73f1a7909db03189ea2ff3 Mon Sep 17 00:00:00 2001
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From: Eugene Syromyatnikov <evgsyr@gmail.com>
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Date: Mon, 4 Jul 2022 12:29:22 +0200
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Subject: [PATCH] tests/bpf: fix sloppy low FD number usage
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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FD 42 can already be opened, so close it. Otherwise, it may lead
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to the following test failure:
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-bpf(BPF_LINK_CREATE, {link_create={prog_fd=0</dev/full>, target_fd=0</dev/full>, attach_type=BPF_TRACE_ITER, flags=0, iter_info=[{map={map_fd=0</dev/full>}}, {map={map_fd=42}}, {map={map_fd=314159265}}, {map={map_fd=-1159983635}}, {map={map_fd=-1}}], iter_info_len=5}}, 28) = 841540765612359407 (INJECTED)
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+bpf(BPF_LINK_CREATE, {link_create={prog_fd=0</dev/full>, target_fd=0</dev/full>, attach_type=BPF_TRACE_ITER, flags=0, iter_info=[{map={map_fd=0</dev/full>}}, {map={map_fd=42}}, {map={map_fd=314159265}}, {map={map_fd=-1159983635}}, {map={map_fd=-1}}], iter_info_len=5}}, 28) = 841540765612359407 (INJECTED)
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bpf(BPF_LINK_CREATE, 0x3ff95574fe5, 28) = 841540765612359407 (INJECTED)
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-bpf(BPF_LINK_CREATE, {link_create={prog_fd=0</dev/full>, target_fd=0</dev/full>, attach_type=BPF_TRACE_ITER, flags=0, iter_info=[{map={map_fd=0</dev/full>}}, {map={map_fd=42}}, {map={map_fd=314159265}}, {map={map_fd=-1159983635}}, {map={map_fd=-1}}, ... /* 0x3ff9555d000 */], iter_info_len=6}}, 28) = 841540765612359407 (INJECTED)
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+bpf(BPF_LINK_CREATE, {link_create={prog_fd=0</dev/full>, target_fd=0</dev/full>, attach_type=BPF_TRACE_ITER, flags=0, iter_info=[{map={map_fd=0</dev/full>}}, {map={map_fd=42}}, {map={map_fd=314159265}}, {map={map_fd=-1159983635}}, {map={map_fd=-1}}, ... /* 0x3ff9555d000 */], iter_info_len=6}}, 28) = 841540765612359407 (INJECTED)
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[...]
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FAIL bpf-success-long-y.test (exit status: 1)
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* tests/bpf.c (init_BPF_LINK_CREATE_attr7): Close iter_info_data[1] fd.
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Fixes: v5.18~18 "bpf: improve bpf(BPF_LINK_CREATE) decoding"
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Reported-by: Lenka Špačková <lkuprova@redhat.com>
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Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=2103137
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---
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tests/bpf.c | 2 ++
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1 file changed, 2 insertions(+)
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diff --git a/tests/bpf.c b/tests/bpf.c
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index 82d870e..6c1ffd4 100644
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--- a/tests/bpf.c
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+++ b/tests/bpf.c
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@@ -1557,6 +1557,8 @@ init_BPF_LINK_CREATE_attr7(struct bpf_attr_check *check, size_t idx)
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{
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struct BPF_LINK_CREATE_struct *attr = &check->data.BPF_LINK_CREATE_data;
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+ close(iter_info_data[1]);
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+
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if (!iter_info_data_p) {
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iter_info_data_p = tail_memdup(iter_info_data,
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sizeof(iter_info_data));
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diff --git a/tests-m32/bpf.c b/tests-m32/bpf.c
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index 82d870e..6c1ffd4 100644
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--- a/tests-m32/bpf.c
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+++ b/tests-m32/bpf.c
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@@ -1557,6 +1557,8 @@ init_BPF_LINK_CREATE_attr7(struct bpf_attr_check *check, size_t idx)
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{
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struct BPF_LINK_CREATE_struct *attr = &check->data.BPF_LINK_CREATE_data;
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+ close(iter_info_data[1]);
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+
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if (!iter_info_data_p) {
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iter_info_data_p = tail_memdup(iter_info_data,
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sizeof(iter_info_data));
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diff --git a/tests-mx32/bpf.c b/tests-mx32/bpf.c
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index 82d870e..6c1ffd4 100644
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--- a/tests-mx32/bpf.c
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+++ b/tests-mx32/bpf.c
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@@ -1557,6 +1557,8 @@ init_BPF_LINK_CREATE_attr7(struct bpf_attr_check *check, size_t idx)
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{
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struct BPF_LINK_CREATE_struct *attr = &check->data.BPF_LINK_CREATE_data;
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+ close(iter_info_data[1]);
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+
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if (!iter_info_data_p) {
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iter_info_data_p = tail_memdup(iter_info_data,
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sizeof(iter_info_data));
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--
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2.1.4
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