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selftests/bpf: Test the length and the address of an arena mmap()

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libbpf maps all max_entries pages of an arena and never maps it at
address 0. No test maps an arena differently. Thus the checks from
"bpf: Refuse an arena mmap() longer than max_entries pages" and
"bpf: Refuse to map an arena at address 0" have no test. Test that a longer
mmap() fails with E2BIG, and that an mmap() at address 0 fails with EINVAL.

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://patch.msgid.link/20261101190535.1454146-8-alexei.starovoitov@gmail.com
This commit is contained in:
Alexei Starovoitov 2026-11-01 19:05:15 +00:00
parent 15dedd4b25
commit 14d3e5bf9f
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1 changed files with 37 additions and 0 deletions
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37
tools/testing/selftests/bpf/prog_tests/arena_mmap.c Normal file
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// SPDX-License-Identifier: GPL-2.0
#include <test_progs.h>
#include <sys/mman.h>
#define ARENA_PAGES 8
static void test_refused(int pages, int flags, int err)
{
LIBBPF_OPTS(bpf_map_create_opts, opts, .map_flags = BPF_F_MMAPABLE);
void *area;
int fd;
fd = bpf_map_create(BPF_MAP_TYPE_ARENA, "arena", 0, 0, ARENA_PAGES, &opts);
if (fd == -EOPNOTSUPP) {
test__skip();
return;
}
if (!ASSERT_GE(fd, 0, "bpf_map_create"))
return;
area = mmap(NULL, pages * getpagesize(), PROT_READ | PROT_WRITE,
MAP_SHARED | flags, fd, 0);
if (ASSERT_EQ(area, MAP_FAILED, "mmap"))
ASSERT_EQ(errno, err, "errno");
else
munmap(area, pages * getpagesize());
close(fd);
}
void test_arena_mmap(void)
{
if (test__start_subtest("long"))
test_refused(ARENA_PAGES + 1, 0, E2BIG);
if (test__start_subtest("address_0"))
test_refused(ARENA_PAGES, MAP_FIXED, EINVAL);
}