tools/testing/selftests/bpf/progs/verifier_bounds_mix_sign_unsign.c

Source file repositories/reference/linux-study-clean/tools/testing/selftests/bpf/progs/verifier_bounds_mix_sign_unsign.c

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/bpf/progs/verifier_bounds_mix_sign_unsign.c
Extension
.c
Size
13171 bytes
Lines
555
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: implementation source
Status
source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0
/* Converted from tools/testing/selftests/bpf/verifier/bounds_mix_sign_unsign.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("bounds checks mixing signed and unsigned, positive bounds")
__failure __msg("unbounded min value")
__failure_unpriv
__naked void signed_and_unsigned_positive_bounds(void)
{
	asm volatile ("					\
	call %[bpf_ktime_get_ns];			\
	*(u64*)(r10 - 16) = r0;				\
	r1 = 0;						\
	*(u64*)(r10 - 8) = r1;				\
	r2 = r10;					\
	r2 += -8;					\
	r1 = %[map_hash_8b] ll;				\
	call %[bpf_map_lookup_elem];			\
	if r0 == 0 goto l0_%=;				\
	r1 = *(u64*)(r10 - 16);				\
	r2 = 2;						\
	if r2 >= r1 goto l0_%=;				\
	if r1 s> 4 goto l0_%=;				\
	r0 += r1;					\
	r1 = 0;						\
	*(u8*)(r0 + 0) = r1;				\
l0_%=:	r0 = 0;						\
	exit;						\
"	:
	: __imm(bpf_ktime_get_ns),
	  __imm(bpf_map_lookup_elem),
	  __imm_addr(map_hash_8b)
	: __clobber_all);
}

SEC("socket")
__description("bounds checks mixing signed and unsigned")
__failure __msg("unbounded min value")
__failure_unpriv
__naked void checks_mixing_signed_and_unsigned(void)
{
	asm volatile ("					\
	call %[bpf_ktime_get_ns];			\
	*(u64*)(r10 - 16) = r0;				\
	r1 = 0;						\
	*(u64*)(r10 - 8) = r1;				\
	r2 = r10;					\
	r2 += -8;					\
	r1 = %[map_hash_8b] ll;				\
	call %[bpf_map_lookup_elem];			\
	if r0 == 0 goto l0_%=;				\
	r1 = *(u64*)(r10 - 16);				\
	r2 = -1;					\
	if r1 > r2 goto l0_%=;				\
	if r1 s> 1 goto l0_%=;				\
	r0 += r1;					\
	r1 = 0;						\
	*(u8*)(r0 + 0) = r1;				\
l0_%=:	r0 = 0;						\
	exit;						\
"	:
	: __imm(bpf_ktime_get_ns),
	  __imm(bpf_map_lookup_elem),
	  __imm_addr(map_hash_8b)
	: __clobber_all);
}

SEC("socket")
__description("bounds checks mixing signed and unsigned, variant 2")
__failure __msg("unbounded min value")
__failure_unpriv
__naked void signed_and_unsigned_variant_2(void)
{
	asm volatile ("					\
	call %[bpf_ktime_get_ns];			\
	*(u64*)(r10 - 16) = r0;				\
	r1 = 0;						\
	*(u64*)(r10 - 8) = r1;				\
	r2 = r10;					\

Annotation

Implementation Notes