selftests/bpf: verifier/bounds_deduction.c converted to inline assembly
Test verifier/bounds_deduction.c automatically converted to use inline assembly. Signed-off-by: Eduard Zingerman <eddyz87@gmail.com> Link: https://lore.kernel.org/r/20230325025524.144043-10-eddyz87@gmail.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Eduard Zingerman
Alexei Starovoitov
parent
0ccbe4956d
commit
7605f94b34
@ -6,6 +6,7 @@
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#include "verifier_and.skel.h"
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#include "verifier_array_access.skel.h"
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#include "verifier_basic_stack.skel.h"
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#include "verifier_bounds_deduction.skel.h"
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__maybe_unused
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static void run_tests_aux(const char *skel_name, skel_elf_bytes_fn elf_bytes_factory)
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@ -34,3 +35,4 @@ static void run_tests_aux(const char *skel_name, skel_elf_bytes_fn elf_bytes_fac
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void test_verifier_and(void) { RUN(verifier_and); }
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void test_verifier_array_access(void) { RUN(verifier_array_access); }
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void test_verifier_basic_stack(void) { RUN(verifier_basic_stack); }
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void test_verifier_bounds_deduction(void) { RUN(verifier_bounds_deduction); }
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171
tools/testing/selftests/bpf/progs/verifier_bounds_deduction.c
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171
tools/testing/selftests/bpf/progs/verifier_bounds_deduction.c
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@ -0,0 +1,171 @@
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// SPDX-License-Identifier: GPL-2.0
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/* Converted from tools/testing/selftests/bpf/verifier/bounds_deduction.c */
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#include <linux/bpf.h>
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#include <bpf/bpf_helpers.h>
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#include "bpf_misc.h"
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SEC("socket")
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__description("check deducing bounds from const, 1")
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__failure __msg("R0 tried to subtract pointer from scalar")
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__msg_unpriv("R1 has pointer with unsupported alu operation")
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__naked void deducing_bounds_from_const_1(void)
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{
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asm volatile (" \
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r0 = 1; \
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if r0 s>= 1 goto l0_%=; \
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l0_%=: r0 -= r1; \
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exit; \
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" ::: __clobber_all);
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}
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SEC("socket")
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__description("check deducing bounds from const, 2")
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__success __failure_unpriv
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__msg_unpriv("R1 has pointer with unsupported alu operation")
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__retval(1)
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__naked void deducing_bounds_from_const_2(void)
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{
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asm volatile (" \
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r0 = 1; \
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if r0 s>= 1 goto l0_%=; \
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exit; \
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l0_%=: if r0 s<= 1 goto l1_%=; \
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exit; \
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l1_%=: r1 -= r0; \
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exit; \
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" ::: __clobber_all);
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}
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SEC("socket")
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__description("check deducing bounds from const, 3")
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__failure __msg("R0 tried to subtract pointer from scalar")
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__msg_unpriv("R1 has pointer with unsupported alu operation")
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__naked void deducing_bounds_from_const_3(void)
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{
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asm volatile (" \
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r0 = 0; \
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if r0 s<= 0 goto l0_%=; \
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l0_%=: r0 -= r1; \
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exit; \
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" ::: __clobber_all);
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}
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SEC("socket")
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__description("check deducing bounds from const, 4")
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__success __failure_unpriv
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__msg_unpriv("R6 has pointer with unsupported alu operation")
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__retval(0)
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__naked void deducing_bounds_from_const_4(void)
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{
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asm volatile (" \
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r6 = r1; \
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r0 = 0; \
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if r0 s<= 0 goto l0_%=; \
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exit; \
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l0_%=: if r0 s>= 0 goto l1_%=; \
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exit; \
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l1_%=: r6 -= r0; \
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exit; \
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" ::: __clobber_all);
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}
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SEC("socket")
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__description("check deducing bounds from const, 5")
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__failure __msg("R0 tried to subtract pointer from scalar")
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__msg_unpriv("R1 has pointer with unsupported alu operation")
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__naked void deducing_bounds_from_const_5(void)
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{
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asm volatile (" \
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r0 = 0; \
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if r0 s>= 1 goto l0_%=; \
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r0 -= r1; \
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l0_%=: exit; \
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" ::: __clobber_all);
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}
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SEC("socket")
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__description("check deducing bounds from const, 6")
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__failure __msg("R0 tried to subtract pointer from scalar")
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__msg_unpriv("R1 has pointer with unsupported alu operation")
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__naked void deducing_bounds_from_const_6(void)
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{
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asm volatile (" \
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r0 = 0; \
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if r0 s>= 0 goto l0_%=; \
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exit; \
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l0_%=: r0 -= r1; \
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exit; \
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" ::: __clobber_all);
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}
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SEC("socket")
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__description("check deducing bounds from const, 7")
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__failure __msg("dereference of modified ctx ptr")
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__msg_unpriv("R1 has pointer with unsupported alu operation")
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__flag(BPF_F_ANY_ALIGNMENT)
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__naked void deducing_bounds_from_const_7(void)
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{
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asm volatile (" \
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r0 = %[__imm_0]; \
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if r0 s>= 0 goto l0_%=; \
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l0_%=: r1 -= r0; \
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r0 = *(u32*)(r1 + %[__sk_buff_mark]); \
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exit; \
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" :
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: __imm_const(__imm_0, ~0),
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__imm_const(__sk_buff_mark, offsetof(struct __sk_buff, mark))
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: __clobber_all);
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}
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SEC("socket")
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__description("check deducing bounds from const, 8")
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__failure __msg("negative offset ctx ptr R1 off=-1 disallowed")
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__msg_unpriv("R1 has pointer with unsupported alu operation")
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__flag(BPF_F_ANY_ALIGNMENT)
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__naked void deducing_bounds_from_const_8(void)
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{
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asm volatile (" \
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r0 = %[__imm_0]; \
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if r0 s>= 0 goto l0_%=; \
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r1 += r0; \
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l0_%=: r0 = *(u32*)(r1 + %[__sk_buff_mark]); \
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exit; \
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" :
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: __imm_const(__imm_0, ~0),
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__imm_const(__sk_buff_mark, offsetof(struct __sk_buff, mark))
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: __clobber_all);
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}
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SEC("socket")
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__description("check deducing bounds from const, 9")
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__failure __msg("R0 tried to subtract pointer from scalar")
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__msg_unpriv("R1 has pointer with unsupported alu operation")
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__naked void deducing_bounds_from_const_9(void)
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{
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asm volatile (" \
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r0 = 0; \
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if r0 s>= 0 goto l0_%=; \
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l0_%=: r0 -= r1; \
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exit; \
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" ::: __clobber_all);
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}
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SEC("socket")
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__description("check deducing bounds from const, 10")
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__failure
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__msg("math between ctx pointer and register with unbounded min value is not allowed")
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__failure_unpriv
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__naked void deducing_bounds_from_const_10(void)
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{
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asm volatile (" \
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r0 = 0; \
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if r0 s<= 0 goto l0_%=; \
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l0_%=: /* Marks reg as unknown. */ \
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r0 = -r0; \
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r0 -= r1; \
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exit; \
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" ::: __clobber_all);
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}
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char _license[] SEC("license") = "GPL";
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@ -1,136 +0,0 @@
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{
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"check deducing bounds from const, 1",
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.insns = {
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BPF_MOV64_IMM(BPF_REG_0, 1),
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BPF_JMP_IMM(BPF_JSGE, BPF_REG_0, 1, 0),
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BPF_ALU64_REG(BPF_SUB, BPF_REG_0, BPF_REG_1),
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BPF_EXIT_INSN(),
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},
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.errstr_unpriv = "R1 has pointer with unsupported alu operation",
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.errstr = "R0 tried to subtract pointer from scalar",
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.result = REJECT,
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},
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{
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"check deducing bounds from const, 2",
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.insns = {
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BPF_MOV64_IMM(BPF_REG_0, 1),
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BPF_JMP_IMM(BPF_JSGE, BPF_REG_0, 1, 1),
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BPF_EXIT_INSN(),
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BPF_JMP_IMM(BPF_JSLE, BPF_REG_0, 1, 1),
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BPF_EXIT_INSN(),
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BPF_ALU64_REG(BPF_SUB, BPF_REG_1, BPF_REG_0),
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BPF_EXIT_INSN(),
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},
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.errstr_unpriv = "R1 has pointer with unsupported alu operation",
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.result_unpriv = REJECT,
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.result = ACCEPT,
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.retval = 1,
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},
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{
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"check deducing bounds from const, 3",
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.insns = {
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BPF_MOV64_IMM(BPF_REG_0, 0),
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BPF_JMP_IMM(BPF_JSLE, BPF_REG_0, 0, 0),
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BPF_ALU64_REG(BPF_SUB, BPF_REG_0, BPF_REG_1),
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BPF_EXIT_INSN(),
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},
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.errstr_unpriv = "R1 has pointer with unsupported alu operation",
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.errstr = "R0 tried to subtract pointer from scalar",
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.result = REJECT,
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},
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{
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"check deducing bounds from const, 4",
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.insns = {
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BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
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BPF_MOV64_IMM(BPF_REG_0, 0),
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BPF_JMP_IMM(BPF_JSLE, BPF_REG_0, 0, 1),
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BPF_EXIT_INSN(),
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BPF_JMP_IMM(BPF_JSGE, BPF_REG_0, 0, 1),
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BPF_EXIT_INSN(),
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BPF_ALU64_REG(BPF_SUB, BPF_REG_6, BPF_REG_0),
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BPF_EXIT_INSN(),
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},
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.errstr_unpriv = "R6 has pointer with unsupported alu operation",
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.result_unpriv = REJECT,
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.result = ACCEPT,
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},
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{
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"check deducing bounds from const, 5",
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.insns = {
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BPF_MOV64_IMM(BPF_REG_0, 0),
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BPF_JMP_IMM(BPF_JSGE, BPF_REG_0, 1, 1),
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BPF_ALU64_REG(BPF_SUB, BPF_REG_0, BPF_REG_1),
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BPF_EXIT_INSN(),
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},
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.errstr_unpriv = "R1 has pointer with unsupported alu operation",
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.errstr = "R0 tried to subtract pointer from scalar",
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.result = REJECT,
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},
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{
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"check deducing bounds from const, 6",
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.insns = {
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BPF_MOV64_IMM(BPF_REG_0, 0),
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BPF_JMP_IMM(BPF_JSGE, BPF_REG_0, 0, 1),
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BPF_EXIT_INSN(),
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BPF_ALU64_REG(BPF_SUB, BPF_REG_0, BPF_REG_1),
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BPF_EXIT_INSN(),
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},
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.errstr_unpriv = "R1 has pointer with unsupported alu operation",
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.errstr = "R0 tried to subtract pointer from scalar",
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.result = REJECT,
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},
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{
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"check deducing bounds from const, 7",
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.insns = {
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BPF_MOV64_IMM(BPF_REG_0, ~0),
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BPF_JMP_IMM(BPF_JSGE, BPF_REG_0, 0, 0),
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BPF_ALU64_REG(BPF_SUB, BPF_REG_1, BPF_REG_0),
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BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_1,
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offsetof(struct __sk_buff, mark)),
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BPF_EXIT_INSN(),
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},
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.errstr_unpriv = "R1 has pointer with unsupported alu operation",
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.errstr = "dereference of modified ctx ptr",
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.result = REJECT,
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.flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,
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},
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{
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"check deducing bounds from const, 8",
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.insns = {
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BPF_MOV64_IMM(BPF_REG_0, ~0),
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BPF_JMP_IMM(BPF_JSGE, BPF_REG_0, 0, 1),
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BPF_ALU64_REG(BPF_ADD, BPF_REG_1, BPF_REG_0),
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BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_1,
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offsetof(struct __sk_buff, mark)),
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BPF_EXIT_INSN(),
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},
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.errstr_unpriv = "R1 has pointer with unsupported alu operation",
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.errstr = "negative offset ctx ptr R1 off=-1 disallowed",
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.result = REJECT,
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.flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,
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},
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{
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"check deducing bounds from const, 9",
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.insns = {
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BPF_MOV64_IMM(BPF_REG_0, 0),
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BPF_JMP_IMM(BPF_JSGE, BPF_REG_0, 0, 0),
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BPF_ALU64_REG(BPF_SUB, BPF_REG_0, BPF_REG_1),
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BPF_EXIT_INSN(),
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},
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.errstr_unpriv = "R1 has pointer with unsupported alu operation",
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.errstr = "R0 tried to subtract pointer from scalar",
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.result = REJECT,
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},
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{
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"check deducing bounds from const, 10",
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.insns = {
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BPF_MOV64_IMM(BPF_REG_0, 0),
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BPF_JMP_IMM(BPF_JSLE, BPF_REG_0, 0, 0),
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/* Marks reg as unknown. */
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BPF_ALU64_IMM(BPF_NEG, BPF_REG_0, 0),
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BPF_ALU64_REG(BPF_SUB, BPF_REG_0, BPF_REG_1),
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BPF_EXIT_INSN(),
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},
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.errstr = "math between ctx pointer and register with unbounded min value is not allowed",
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.result = REJECT,
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},
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