c6bde958a6
Currently key_size of hashtab is limited to MAX_BPF_STACK. As the key of hashtab can also be a value from a per cpu map it can be larger than MAX_BPF_STACK. The use-case for this patch originates to implement allow/disallow lists for files and file paths. The maximum length of file paths is defined by PATH_MAX with 4096 chars including nul. This limit exceeds MAX_BPF_STACK. Changelog: v5: - Fix cast overflow v4: - Utilize BPF skeleton in tests - Rebase v3: - Rebase v2: - Add a test for bpf side Signed-off-by: Florian Lehner <dev@der-flo.net> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: John Fastabend <john.fastabend@gmail.com> Acked-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/bpf/20201029201442.596690-1-dev@der-flo.net
44 lines
1.0 KiB
C
44 lines
1.0 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <test_progs.h>
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#include "test_hash_large_key.skel.h"
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void test_hash_large_key(void)
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{
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int err, value = 21, duration = 0, hash_map_fd;
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struct test_hash_large_key *skel;
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struct bigelement {
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int a;
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char b[4096];
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long long c;
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} key;
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bzero(&key, sizeof(key));
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skel = test_hash_large_key__open_and_load();
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if (CHECK(!skel, "skel_open_and_load", "skeleton open/load failed\n"))
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return;
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hash_map_fd = bpf_map__fd(skel->maps.hash_map);
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if (CHECK(hash_map_fd < 0, "bpf_map__fd", "failed\n"))
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goto cleanup;
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err = test_hash_large_key__attach(skel);
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if (CHECK(err, "attach_raw_tp", "err %d\n", err))
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goto cleanup;
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err = bpf_map_update_elem(hash_map_fd, &key, &value, BPF_ANY);
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if (CHECK(err, "bpf_map_update_elem", "errno=%d\n", errno))
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goto cleanup;
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key.c = 1;
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err = bpf_map_lookup_elem(hash_map_fd, &key, &value);
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if (CHECK(err, "bpf_map_lookup_elem", "errno=%d\n", errno))
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goto cleanup;
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CHECK_FAIL(value != 42);
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cleanup:
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test_hash_large_key__destroy(skel);
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}
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