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selftests/bpf: add tests for attaching invalid fd

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Add test cases for situations where adding the following types of file
descriptors to a cpumap entry should fail:
- Non-BPF file descriptor (expect -EINVAL)
- Nonexistent file descriptor (expect -EBADF)

Also tighten the assertion for the expected error when adding a
non-BPF_XDP_CPUMAP program to a cpumap entry.

Signed-off-by: Kohei Enju <enjuk@amazon.com>
Reviewed-by: Toke Høiland-Jørgensen <toke@redhat.com>
Link: https://lore.kernel.org/r/20251208131449.73036-3-enjuk@amazon.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Kohei Enju 2025-12-08 22:14:32 +09:00 committed by Alexei Starovoitov
parent 48e11bad9a
commit 18352f8fae
1 changed files with 17 additions and 2 deletions
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19
tools/testing/selftests/bpf/prog_tests/xdp_cpumap_attach.c
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@ -18,7 +18,7 @@ static void test_xdp_with_cpumap_helpers(void)
struct bpf_cpumap_val val = {
.qsize = 192,
};
int err, prog_fd, prog_redir_fd, map_fd;
int err, prog_fd, prog_redir_fd, map_fd, bad_fd;
struct nstoken *nstoken = NULL;
__u32 idx = 0;
@ -79,7 +79,22 @@ static void test_xdp_with_cpumap_helpers(void)
val.qsize = 192;
val.bpf_prog.fd = bpf_program__fd(skel->progs.xdp_dummy_prog);
err = bpf_map_update_elem(map_fd, &idx, &val, 0);
ASSERT_NEQ(err, 0, "Add non-BPF_XDP_CPUMAP program to cpumap entry");
ASSERT_EQ(err, -EINVAL, "Add non-BPF_XDP_CPUMAP program to cpumap entry");
/* Try to attach non-BPF file descriptor */
bad_fd = open("/dev/null", O_RDONLY);
ASSERT_GE(bad_fd, 0, "Open /dev/null for non-BPF fd");
val.bpf_prog.fd = bad_fd;
err = bpf_map_update_elem(map_fd, &idx, &val, 0);
ASSERT_EQ(err, -EINVAL, "Add non-BPF fd to cpumap entry");
/* Try to attach nonexistent file descriptor */
err = close(bad_fd);
ASSERT_EQ(err, 0, "Close non-BPF fd for nonexistent fd");
err = bpf_map_update_elem(map_fd, &idx, &val, 0);
ASSERT_EQ(err, -EBADF, "Add nonexistent fd to cpumap entry");
/* Try to attach BPF_XDP program with frags to cpumap when we have
* already loaded a BPF_XDP program on the map