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

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

Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/r/20230325025524.144043-18-eddyz87@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Eduard Zingerman 2023-03-25 04:54:58 +02:00 committed by Alexei Starovoitov
parent a58475a989
commit 84988478fb
3 changed files with 58 additions and 40 deletions
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2
tools/testing/selftests/bpf/prog_tests/verifier.c
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@ -14,6 +14,7 @@
#include "verifier_cgroup_storage.skel.h"
#include "verifier_const_or.skel.h"
#include "verifier_ctx_sk_msg.skel.h"
#include "verifier_direct_stack_access_wraparound.skel.h"
__maybe_unused
static void run_tests_aux(const char *skel_name, skel_elf_bytes_fn elf_bytes_factory)
@ -50,3 +51,4 @@ void test_verifier_cgroup_skb(void) { RUN(verifier_cgroup_skb); }
void test_verifier_cgroup_storage(void) { RUN(verifier_cgroup_storage); }
void test_verifier_const_or(void) { RUN(verifier_const_or); }
void test_verifier_ctx_sk_msg(void) { RUN(verifier_ctx_sk_msg); }
void test_verifier_direct_stack_access_wraparound(void) { RUN(verifier_direct_stack_access_wraparound); }

56
tools/testing/selftests/bpf/progs/verifier_direct_stack_access_wraparound.c Normal file
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@ -0,0 +1,56 @@
// SPDX-License-Identifier: GPL-2.0
/* Converted from tools/testing/selftests/bpf/verifier/direct_stack_access_wraparound.c */
#include <linux/bpf.h>
#include <bpf/bpf_helpers.h>
#include "bpf_misc.h"
SEC("socket")
__description("direct stack access with 32-bit wraparound. test1")
__failure __msg("fp pointer and 2147483647")
__failure_unpriv
__naked void with_32_bit_wraparound_test1(void)
{
asm volatile (" \
r1 = r10; \
r1 += 0x7fffffff; \
r1 += 0x7fffffff; \
w0 = 0; \
*(u8*)(r1 + 0) = r0; \
exit; \
" ::: __clobber_all);
}
SEC("socket")
__description("direct stack access with 32-bit wraparound. test2")
__failure __msg("fp pointer and 1073741823")
__failure_unpriv
__naked void with_32_bit_wraparound_test2(void)
{
asm volatile (" \
r1 = r10; \
r1 += 0x3fffffff; \
r1 += 0x3fffffff; \
w0 = 0; \
*(u8*)(r1 + 0) = r0; \
exit; \
" ::: __clobber_all);
}
SEC("socket")
__description("direct stack access with 32-bit wraparound. test3")
__failure __msg("fp pointer offset 1073741822")
__msg_unpriv("R1 stack pointer arithmetic goes out of range")
__naked void with_32_bit_wraparound_test3(void)
{
asm volatile (" \
r1 = r10; \
r1 += 0x1fffffff; \
r1 += 0x1fffffff; \
w0 = 0; \
*(u8*)(r1 + 0) = r0; \
exit; \
" ::: __clobber_all);
}
char _license[] SEC("license") = "GPL";

40
tools/testing/selftests/bpf/verifier/direct_stack_access_wraparound.c
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@ -1,40 +0,0 @@
{
"direct stack access with 32-bit wraparound. test1",
.insns = {
BPF_MOV64_REG(BPF_REG_1, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 0x7fffffff),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 0x7fffffff),
BPF_MOV32_IMM(BPF_REG_0, 0),
BPF_STX_MEM(BPF_B, BPF_REG_1, BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.errstr = "fp pointer and 2147483647",
.result = REJECT
},
{
"direct stack access with 32-bit wraparound. test2",
.insns = {
BPF_MOV64_REG(BPF_REG_1, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 0x3fffffff),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 0x3fffffff),
BPF_MOV32_IMM(BPF_REG_0, 0),
BPF_STX_MEM(BPF_B, BPF_REG_1, BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.errstr = "fp pointer and 1073741823",
.result = REJECT
},
{
"direct stack access with 32-bit wraparound. test3",
.insns = {
BPF_MOV64_REG(BPF_REG_1, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 0x1fffffff),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 0x1fffffff),
BPF_MOV32_IMM(BPF_REG_0, 0),
BPF_STX_MEM(BPF_B, BPF_REG_1, BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.errstr = "fp pointer offset 1073741822",
.errstr_unpriv = "R1 stack pointer arithmetic goes out of range",
.result = REJECT
},