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selftests/bpf: verifier/d_path converted to inline assembly 

Test verifier/d_path automatically converted to use inline assembly.

Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/r/20230421174234.2391278-7-eddyz87@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Eduard Zingerman 2023-04-21 20:42:16 +03:00 committed by Alexei Starovoitov
parent fcd36964f2
commit 6080280243
3 changed files with 50 additions and 37 deletions
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2
tools/testing/selftests/bpf/prog_tests/verifier.c
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@ -19,6 +19,7 @@
#include "verifier_const_or.skel.h"
#include "verifier_ctx.skel.h"
#include "verifier_ctx_sk_msg.skel.h"
#include "verifier_d_path.skel.h"
#include "verifier_direct_stack_access_wraparound.skel.h"
#include "verifier_div0.skel.h"
#include "verifier_div_overflow.skel.h"
@ -99,6 +100,7 @@ void test_verifier_cgroup_storage(void) { RUN(verifier_cgroup_storage); }
void test_verifier_const_or(void) { RUN(verifier_const_or); }
void test_verifier_ctx(void) { RUN(verifier_ctx); }
void test_verifier_ctx_sk_msg(void) { RUN(verifier_ctx_sk_msg); }
void test_verifier_d_path(void) { RUN(verifier_d_path); }
void test_verifier_direct_stack_access_wraparound(void) { RUN(verifier_direct_stack_access_wraparound); }
void test_verifier_div0(void) { RUN(verifier_div0); }
void test_verifier_div_overflow(void) { RUN(verifier_div_overflow); }

48
tools/testing/selftests/bpf/progs/verifier_d_path.c Normal file
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@ -0,0 +1,48 @@
// SPDX-License-Identifier: GPL-2.0
/* Converted from tools/testing/selftests/bpf/verifier/d_path.c */
#include <linux/bpf.h>
#include <bpf/bpf_helpers.h>
#include "bpf_misc.h"
SEC("fentry/dentry_open")
__description("d_path accept")
__success __retval(0)
__naked void d_path_accept(void)
{
asm volatile (" \
r1 = *(u32*)(r1 + 0); \
r2 = r10; \
r2 += -8; \
r6 = 0; \
*(u64*)(r2 + 0) = r6; \
r3 = 8 ll; \
call %[bpf_d_path]; \
r0 = 0; \
exit; \
" :
: __imm(bpf_d_path)
: __clobber_all);
}
SEC("fentry/d_path")
__description("d_path reject")
__failure __msg("helper call is not allowed in probe")
__naked void d_path_reject(void)
{
asm volatile (" \
r1 = *(u32*)(r1 + 0); \
r2 = r10; \
r2 += -8; \
r6 = 0; \
*(u64*)(r2 + 0) = r6; \
r3 = 8 ll; \
call %[bpf_d_path]; \
r0 = 0; \
exit; \
" :
: __imm(bpf_d_path)
: __clobber_all);
}
char _license[] SEC("license") = "GPL";

37
tools/testing/selftests/bpf/verifier/d_path.c
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@ -1,37 +0,0 @@
{
"d_path accept",
.insns = {
BPF_LDX_MEM(BPF_W, BPF_REG_1, BPF_REG_1, 0),
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
BPF_MOV64_IMM(BPF_REG_6, 0),
BPF_STX_MEM(BPF_DW, BPF_REG_2, BPF_REG_6, 0),
BPF_LD_IMM64(BPF_REG_3, 8),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_d_path),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.result = ACCEPT,
.prog_type = BPF_PROG_TYPE_TRACING,
.expected_attach_type = BPF_TRACE_FENTRY,
.kfunc = "dentry_open",
},
{
"d_path reject",
.insns = {
BPF_LDX_MEM(BPF_W, BPF_REG_1, BPF_REG_1, 0),
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
BPF_MOV64_IMM(BPF_REG_6, 0),
BPF_STX_MEM(BPF_DW, BPF_REG_2, BPF_REG_6, 0),
BPF_LD_IMM64(BPF_REG_3, 8),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_d_path),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.errstr = "helper call is not allowed in probe",
.result = REJECT,
.prog_type = BPF_PROG_TYPE_TRACING,
.expected_attach_type = BPF_TRACE_FENTRY,
.kfunc = "d_path",
},