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selftests/bpf: verifier/cfg.c converted to inline assembly

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Test verifier/cfg.c automatically converted to use inline assembly.

Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/r/20230325025524.144043-12-eddyz87@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Eduard Zingerman 2023-03-25 04:54:52 +02:00 committed by Alexei Starovoitov
parent b14a702afd
commit 2f2047c22c
3 changed files with 102 additions and 73 deletions
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2
tools/testing/selftests/bpf/prog_tests/verifier.c
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@ -8,6 +8,7 @@
#include "verifier_basic_stack.skel.h"
#include "verifier_bounds_deduction.skel.h"
#include "verifier_bounds_mix_sign_unsign.skel.h"
#include "verifier_cfg.skel.h"
__maybe_unused
static void run_tests_aux(const char *skel_name, skel_elf_bytes_fn elf_bytes_factory)
@ -38,3 +39,4 @@ void test_verifier_array_access(void) { RUN(verifier_array_access); }
void test_verifier_basic_stack(void) { RUN(verifier_basic_stack); }
void test_verifier_bounds_deduction(void) { RUN(verifier_bounds_deduction); }
void test_verifier_bounds_mix_sign_unsign(void) { RUN(verifier_bounds_mix_sign_unsign); }
void test_verifier_cfg(void) { RUN(verifier_cfg); }

100
tools/testing/selftests/bpf/progs/verifier_cfg.c Normal file
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@ -0,0 +1,100 @@
// SPDX-License-Identifier: GPL-2.0
/* Converted from tools/testing/selftests/bpf/verifier/cfg.c */
#include <linux/bpf.h>
#include <bpf/bpf_helpers.h>
#include "bpf_misc.h"
SEC("socket")
__description("unreachable")
__failure __msg("unreachable")
__failure_unpriv
__naked void unreachable(void)
{
asm volatile (" \
exit; \
exit; \
" ::: __clobber_all);
}
SEC("socket")
__description("unreachable2")
__failure __msg("unreachable")
__failure_unpriv
__naked void unreachable2(void)
{
asm volatile (" \
goto l0_%=; \
goto l0_%=; \
l0_%=: exit; \
" ::: __clobber_all);
}
SEC("socket")
__description("out of range jump")
__failure __msg("jump out of range")
__failure_unpriv
__naked void out_of_range_jump(void)
{
asm volatile (" \
goto l0_%=; \
exit; \
l0_%=: \
" ::: __clobber_all);
}
SEC("socket")
__description("out of range jump2")
__failure __msg("jump out of range")
__failure_unpriv
__naked void out_of_range_jump2(void)
{
asm volatile (" \
goto -2; \
exit; \
" ::: __clobber_all);
}
SEC("socket")
__description("loop (back-edge)")
__failure __msg("unreachable insn 1")
__msg_unpriv("back-edge")
__naked void loop_back_edge(void)
{
asm volatile (" \
l0_%=: goto l0_%=; \
exit; \
" ::: __clobber_all);
}
SEC("socket")
__description("loop2 (back-edge)")
__failure __msg("unreachable insn 4")
__msg_unpriv("back-edge")
__naked void loop2_back_edge(void)
{
asm volatile (" \
l0_%=: r1 = r0; \
r2 = r0; \
r3 = r0; \
goto l0_%=; \
exit; \
" ::: __clobber_all);
}
SEC("socket")
__description("conditional loop")
__failure __msg("infinite loop detected")
__msg_unpriv("back-edge")
__naked void conditional_loop(void)
{
asm volatile (" \
r0 = r1; \
l0_%=: r2 = r0; \
r3 = r0; \
if r1 == 0 goto l0_%=; \
exit; \
" ::: __clobber_all);
}
char _license[] SEC("license") = "GPL";

73
tools/testing/selftests/bpf/verifier/cfg.c
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@ -1,73 +0,0 @@
{
"unreachable",
.insns = {
BPF_EXIT_INSN(),
BPF_EXIT_INSN(),
},
.errstr = "unreachable",
.result = REJECT,
},
{
"unreachable2",
.insns = {
BPF_JMP_IMM(BPF_JA, 0, 0, 1),
BPF_JMP_IMM(BPF_JA, 0, 0, 0),
BPF_EXIT_INSN(),
},
.errstr = "unreachable",
.result = REJECT,
},
{
"out of range jump",
.insns = {
BPF_JMP_IMM(BPF_JA, 0, 0, 1),
BPF_EXIT_INSN(),
},
.errstr = "jump out of range",
.result = REJECT,
},
{
"out of range jump2",
.insns = {
BPF_JMP_IMM(BPF_JA, 0, 0, -2),
BPF_EXIT_INSN(),
},
.errstr = "jump out of range",
.result = REJECT,
},
{
"loop (back-edge)",
.insns = {
BPF_JMP_IMM(BPF_JA, 0, 0, -1),
BPF_EXIT_INSN(),
},
.errstr = "unreachable insn 1",
.errstr_unpriv = "back-edge",
.result = REJECT,
},
{
"loop2 (back-edge)",
.insns = {
BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
BPF_MOV64_REG(BPF_REG_2, BPF_REG_0),
BPF_MOV64_REG(BPF_REG_3, BPF_REG_0),
BPF_JMP_IMM(BPF_JA, 0, 0, -4),
BPF_EXIT_INSN(),
},
.errstr = "unreachable insn 4",
.errstr_unpriv = "back-edge",
.result = REJECT,
},
{
"conditional loop",
.insns = {
BPF_MOV64_REG(BPF_REG_0, BPF_REG_1),
BPF_MOV64_REG(BPF_REG_2, BPF_REG_0),
BPF_MOV64_REG(BPF_REG_3, BPF_REG_0),
BPF_JMP_IMM(BPF_JEQ, BPF_REG_1, 0, -3),
BPF_EXIT_INSN(),
},
.errstr = "infinite loop detected",
.errstr_unpriv = "back-edge",
.result = REJECT,
},