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selftests/bpf: Negative test case for tail call map

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This patch adds a negative test case for the following verifier error.

    expected prog array map for tail call

Acked-by: Yonghong Song <yonghong.song@linux.dev>
Signed-off-by: Paul Chaignon <paul.chaignon@gmail.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/r/aGu0i1X_jII-3aFa@mail.gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Paul Chaignon
2025-07-07 13:50:35 +02:00
committed by Alexei Starovoitov
parent df4b1eebd8
commit 192e3aa145
2 changed files with 33 additions and 0 deletions
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2
tools/testing/selftests/bpf/prog_tests/verifier.c
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@@ -85,6 +85,7 @@
#include "verifier_store_release.skel.h"
#include "verifier_subprog_precision.skel.h"
#include "verifier_subreg.skel.h"
#include "verifier_tailcall.skel.h"
#include "verifier_tailcall_jit.skel.h"
#include "verifier_typedef.skel.h"
#include "verifier_uninit.skel.h"
@@ -219,6 +220,7 @@ void test_verifier_stack_ptr(void) { RUN(verifier_stack_ptr); }
void test_verifier_store_release(void) { RUN(verifier_store_release); }
void test_verifier_subprog_precision(void) { RUN(verifier_subprog_precision); }
void test_verifier_subreg(void) { RUN(verifier_subreg); }
void test_verifier_tailcall(void) { RUN(verifier_tailcall); }
void test_verifier_tailcall_jit(void) { RUN(verifier_tailcall_jit); }
void test_verifier_typedef(void) { RUN(verifier_typedef); }
void test_verifier_uninit(void) { RUN(verifier_uninit); }

31
tools/testing/selftests/bpf/progs/verifier_tailcall.c Normal file
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@@ -0,0 +1,31 @@
// SPDX-License-Identifier: GPL-2.0
#include <linux/bpf.h>
#include <bpf/bpf_helpers.h>
#include "bpf_misc.h"
struct {
__uint(type, BPF_MAP_TYPE_ARRAY);
__uint(max_entries, 1);
__type(key, __u32);
__type(value, __u32);
} map_array SEC(".maps");
SEC("socket")
__description("invalid map type for tail call")
__failure __msg("expected prog array map for tail call")
__failure_unpriv
__naked void invalid_map_for_tail_call(void)
{
asm volatile (" \
r2 = %[map_array] ll; \
r3 = 0; \
call %[bpf_tail_call]; \
exit; \
" :
: __imm(bpf_tail_call),
__imm_addr(map_array)
: __clobber_all);
}
char _license[] SEC("license") = "GPL";