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

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

Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/r/20230325025524.144043-9-eddyz87@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Eduard Zingerman 2023-03-25 04:54:49 +02:00 • committed by Alexei Starovoitov
parent a3c830ae02
commit 0ccbe4956d
3 changed files with 102 additions and 64 deletions
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2
tools/testing/selftests/bpf/prog_tests/verifier.c
View file

@ -5,6 +5,7 @@
#include "cap_helpers.h" #include "cap_helpers.h"
#include "verifier_and.skel.h" #include "verifier_and.skel.h"
#include "verifier_array_access.skel.h" #include "verifier_array_access.skel.h"
#include "verifier_basic_stack.skel.h"
__maybe_unused __maybe_unused
static void run_tests_aux(const char *skel_name, skel_elf_bytes_fn elf_bytes_factory) static void run_tests_aux(const char *skel_name, skel_elf_bytes_fn elf_bytes_factory)
@ -32,3 +33,4 @@ static void run_tests_aux(const char *skel_name, skel_elf_bytes_fn elf_bytes_fac
void test_verifier_and(void) { RUN(verifier_and); } void test_verifier_and(void) { RUN(verifier_and); }
void test_verifier_array_access(void) { RUN(verifier_array_access); } void test_verifier_array_access(void) { RUN(verifier_array_access); }
void test_verifier_basic_stack(void) { RUN(verifier_basic_stack); }

100
tools/testing/selftests/bpf/progs/verifier_basic_stack.c Normal file
View file

@ -0,0 +1,100 @@
// SPDX-License-Identifier: GPL-2.0
/* Converted from tools/testing/selftests/bpf/verifier/basic_stack.c */
#include <linux/bpf.h>
#include <bpf/bpf_helpers.h>
#include "bpf_misc.h"
struct {
__uint(type, BPF_MAP_TYPE_HASH);
__uint(max_entries, 1);
__type(key, long long);
__type(value, long long);
} map_hash_8b SEC(".maps");
SEC("socket")
__description("stack out of bounds")
__failure __msg("invalid write to stack")
__failure_unpriv
__naked void stack_out_of_bounds(void)
{
asm volatile (" \
r1 = 0; \
*(u64*)(r10 + 8) = r1; \
exit; \
" ::: __clobber_all);
}
SEC("socket")
__description("uninitialized stack1")
__failure __msg("invalid indirect read from stack")
__failure_unpriv
__naked void uninitialized_stack1(void)
{
asm volatile (" \
r2 = r10; \
r2 += -8; \
r1 = %[map_hash_8b] ll; \
call %[bpf_map_lookup_elem]; \
exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm_addr(map_hash_8b)
: __clobber_all);
}
SEC("socket")
__description("uninitialized stack2")
__failure __msg("invalid read from stack")
__failure_unpriv
__naked void uninitialized_stack2(void)
{
asm volatile (" \
r2 = r10; \
r0 = *(u64*)(r2 - 8); \
exit; \
" ::: __clobber_all);
}
SEC("socket")
__description("invalid fp arithmetic")
__failure __msg("R1 subtraction from stack pointer")
__failure_unpriv
__naked void invalid_fp_arithmetic(void)
{
/* If this gets ever changed, make sure JITs can deal with it. */
asm volatile (" \
r0 = 0; \
r1 = r10; \
r1 -= 8; \
*(u64*)(r1 + 0) = r0; \
exit; \
" ::: __clobber_all);
}
SEC("socket")
__description("non-invalid fp arithmetic")
__success __success_unpriv __retval(0)
__naked void non_invalid_fp_arithmetic(void)
{
asm volatile (" \
r0 = 0; \
*(u64*)(r10 - 8) = r0; \
exit; \
" ::: __clobber_all);
}
SEC("socket")
__description("misaligned read from stack")
__failure __msg("misaligned stack access")
__failure_unpriv
__naked void misaligned_read_from_stack(void)
{
asm volatile (" \
r2 = r10; \
r0 = *(u64*)(r2 - 4); \
exit; \
" ::: __clobber_all);
}
char _license[] SEC("license") = "GPL";

64
tools/testing/selftests/bpf/verifier/basic_stack.c
View file

@ -1,64 +0,0 @@
{
"stack out of bounds",
.insns = {
BPF_ST_MEM(BPF_DW, BPF_REG_10, 8, 0),
BPF_EXIT_INSN(),
},
.errstr = "invalid write to stack",
.result = REJECT,
},
{
"uninitialized stack1",
.insns = {
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
BPF_LD_MAP_FD(BPF_REG_1, 0),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
BPF_EXIT_INSN(),
},
.fixup_map_hash_8b = { 2 },
.errstr = "invalid indirect read from stack",
.result = REJECT,
},
{
"uninitialized stack2",
.insns = {
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_2, -8),
BPF_EXIT_INSN(),
},
.errstr = "invalid read from stack",
.result = REJECT,
},
{
"invalid fp arithmetic",
/* If this gets ever changed, make sure JITs can deal with it. */
.insns = {
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_MOV64_REG(BPF_REG_1, BPF_REG_10),
BPF_ALU64_IMM(BPF_SUB, BPF_REG_1, 8),
BPF_STX_MEM(BPF_DW, BPF_REG_1, BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.errstr = "R1 subtraction from stack pointer",
.result = REJECT,
},
{
"non-invalid fp arithmetic",
.insns = {
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_0, -8),
BPF_EXIT_INSN(),
},
.result = ACCEPT,
},
{
"misaligned read from stack",
.insns = {
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_2, -4),
BPF_EXIT_INSN(),
},
.errstr = "misaligned stack access",
.result = REJECT,
},