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selftests/bpf: Add unit tests with __bpf_trap() kfunc

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Add some inline-asm tests and C tests where __bpf_trap() or
__builtin_trap() is used in the code. The __builtin_trap()
test is guarded with llvm21 ([1]) since otherwise the compilation
failure will happen.

  [1] https://github.com/llvm/llvm-project/pull/131731

Signed-off-by: Yonghong Song <yonghong.song@linux.dev>
Link: https://lore.kernel.org/r/20250523205331.1291734-1-yonghong.song@linux.dev
Tested-by: Eduard Zingerman <eddyz87@gmail.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Yonghong Song
2025-05-23 13:53:31 -07:00
committed by Alexei Starovoitov
parent f95695f2c4
commit 92de53d247
2 changed files with 73 additions and 0 deletions
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2
tools/testing/selftests/bpf/prog_tests/verifier.c
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@@ -14,6 +14,7 @@
#include "verifier_bounds_deduction_non_const.skel.h"
#include "verifier_bounds_mix_sign_unsign.skel.h"
#include "verifier_bpf_get_stack.skel.h"
#include "verifier_bpf_trap.skel.h"
#include "verifier_bswap.skel.h"
#include "verifier_btf_ctx_access.skel.h"
#include "verifier_btf_unreliable_prog.skel.h"
@@ -148,6 +149,7 @@ void test_verifier_bounds_deduction(void) { RUN(verifier_bounds_deduction);
void test_verifier_bounds_deduction_non_const(void) { RUN(verifier_bounds_deduction_non_const); }
void test_verifier_bounds_mix_sign_unsign(void) { RUN(verifier_bounds_mix_sign_unsign); }
void test_verifier_bpf_get_stack(void) { RUN(verifier_bpf_get_stack); }
void test_verifier_bpf_trap(void) { RUN(verifier_bpf_trap); }
void test_verifier_bswap(void) { RUN(verifier_bswap); }
void test_verifier_btf_ctx_access(void) { RUN(verifier_btf_ctx_access); }
void test_verifier_btf_unreliable_prog(void) { RUN(verifier_btf_unreliable_prog); }

71
tools/testing/selftests/bpf/progs/verifier_bpf_trap.c Normal file
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@@ -0,0 +1,71 @@
// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2025 Meta Platforms, Inc. and affiliates. */
#include <vmlinux.h>
#include <bpf/bpf_helpers.h>
#include "bpf_misc.h"
#if __clang_major__ >= 21 && 0
SEC("socket")
__description("__builtin_trap with simple c code")
__failure __msg("unexpected __bpf_trap() due to uninitialized variable?")
void bpf_builtin_trap_with_simple_c(void)
{
__builtin_trap();
}
#endif
SEC("socket")
__description("__bpf_trap with simple c code")
__failure __msg("unexpected __bpf_trap() due to uninitialized variable?")
void bpf_trap_with_simple_c(void)
{
__bpf_trap();
}
SEC("socket")
__description("__bpf_trap as the second-from-last insn")
__failure __msg("unexpected __bpf_trap() due to uninitialized variable?")
__naked void bpf_trap_at_func_end(void)
{
asm volatile (
"r0 = 0;"
"call %[__bpf_trap];"
"exit;"
:
: __imm(__bpf_trap)
: __clobber_all);
}
SEC("socket")
__description("dead code __bpf_trap in the middle of code")
__success
__naked void dead_bpf_trap_in_middle(void)
{
asm volatile (
"r0 = 0;"
"if r0 == 0 goto +1;"
"call %[__bpf_trap];"
"r0 = 2;"
"exit;"
:
: __imm(__bpf_trap)
: __clobber_all);
}
SEC("socket")
__description("reachable __bpf_trap in the middle of code")
__failure __msg("unexpected __bpf_trap() due to uninitialized variable?")
__naked void live_bpf_trap_in_middle(void)
{
asm volatile (
"r0 = 0;"
"if r0 == 1 goto +1;"
"call %[__bpf_trap];"
"r0 = 2;"
"exit;"
:
: __imm(__bpf_trap)
: __clobber_all);
}
char _license[] SEC("license") = "GPL";