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

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

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/bpf/progs/verifier_masking.c
Extension
.c
Size
7943 bytes
Lines
411
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/masking.c */

#include <linux/bpf.h>
#include <bpf/bpf_helpers.h>
#include "bpf_misc.h"

SEC("socket")
__description("masking, test out of bounds 1")
__success __success_unpriv __retval(0)
__naked void test_out_of_bounds_1(void)
{
	asm volatile ("					\
	w1 = 5;						\
	w2 = %[__imm_0];				\
	r2 -= r1;					\
	r2 |= r1;					\
	r2 = -r2;					\
	r2 s>>= 63;					\
	r1 &= r2;					\
	r0 = r1;					\
	exit;						\
"	:
	: __imm_const(__imm_0, 5 - 1)
	: __clobber_all);
}

SEC("socket")
__description("masking, test out of bounds 2")
__success __success_unpriv __retval(0)
__naked void test_out_of_bounds_2(void)
{
	asm volatile ("					\
	w1 = 1;						\
	w2 = %[__imm_0];				\
	r2 -= r1;					\
	r2 |= r1;					\
	r2 = -r2;					\
	r2 s>>= 63;					\
	r1 &= r2;					\
	r0 = r1;					\
	exit;						\
"	:
	: __imm_const(__imm_0, 1 - 1)
	: __clobber_all);
}

SEC("socket")
__description("masking, test out of bounds 3")
__success __success_unpriv __retval(0)
__naked void test_out_of_bounds_3(void)
{
	asm volatile ("					\
	w1 = 0xffffffff;				\
	w2 = %[__imm_0];				\
	r2 -= r1;					\
	r2 |= r1;					\
	r2 = -r2;					\
	r2 s>>= 63;					\
	r1 &= r2;					\
	r0 = r1;					\
	exit;						\
"	:
	: __imm_const(__imm_0, 0xffffffff - 1)
	: __clobber_all);
}

SEC("socket")
__description("masking, test out of bounds 4")
__success __success_unpriv __retval(0)
__naked void test_out_of_bounds_4(void)
{
	asm volatile ("					\
	w1 = 0xffffffff;				\
	w2 = %[__imm_0];				\
	r2 -= r1;					\
	r2 |= r1;					\
	r2 = -r2;					\
	r2 s>>= 63;					\
	r1 &= r2;					\
	r0 = r1;					\
	exit;						\
"	:
	: __imm_const(__imm_0, 1 - 1)
	: __clobber_all);
}

SEC("socket")
__description("masking, test out of bounds 5")
__success __success_unpriv __retval(0)

Annotation

Implementation Notes