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

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

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/bpf/progs/verifier_int_ptr.c
Extension
.c
Size
3442 bytes
Lines
156
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/int_ptr.c */

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

SEC("socket")
__description("arg pointer to long uninitialized")
__success
__naked void arg_ptr_to_long_uninitialized(void)
{
	asm volatile ("					\
	/* bpf_strtoul arg1 (buf) */			\
	r7 = r10;					\
	r7 += -8;					\
	r0 = 0x00303036;				\
	*(u64*)(r7 + 0) = r0;				\
	r1 = r7;					\
	/* bpf_strtoul arg2 (buf_len) */		\
	r2 = 4;						\
	/* bpf_strtoul arg3 (flags) */			\
	r3 = 0;						\
	/* bpf_strtoul arg4 (res) */			\
	r7 += -8;					\
	r4 = r7;					\
	/* bpf_strtoul() */				\
	call %[bpf_strtoul];				\
	r0 = 1;						\
	exit;						\
"	:
	: __imm(bpf_strtoul)
	: __clobber_all);
}

SEC("socket")
__description("arg pointer to long half-uninitialized")
__success
__retval(0)
__naked void ptr_to_long_half_uninitialized(void)
{
	asm volatile ("					\
	/* bpf_strtoul arg1 (buf) */			\
	r7 = r10;					\
	r7 += -8;					\
	r0 = 0x00303036;				\
	*(u64*)(r7 + 0) = r0;				\
	r1 = r7;					\
	/* bpf_strtoul arg2 (buf_len) */		\
	r2 = 4;						\
	/* bpf_strtoul arg3 (flags) */			\
	r3 = 0;						\
	/* bpf_strtoul arg4 (res) */			\
	r7 += -8;					\
	*(u32*)(r7 + 0) = r0;				\
	r4 = r7;					\
	/* bpf_strtoul() */				\
	call %[bpf_strtoul];				\
	r0 = 0;						\
	exit;						\
"	:
	: __imm(bpf_strtoul)
	: __clobber_all);
}

SEC("cgroup/sysctl")
__description("arg pointer to long misaligned")
__failure __msg("misaligned stack access off -20+0 size 8")
__naked void arg_ptr_to_long_misaligned(void)
{
	asm volatile ("					\
	/* bpf_strtoul arg1 (buf) */			\
	r7 = r10;					\
	r7 += -8;					\
	r0 = 0x00303036;				\
	*(u64*)(r7 + 0) = r0;				\
	r1 = r7;					\
	/* bpf_strtoul arg2 (buf_len) */		\
	r2 = 4;						\
	/* bpf_strtoul arg3 (flags) */			\
	r3 = 0;						\
	/* bpf_strtoul arg4 (res) */			\
	r7 += -12;					\
	r0 = 0;						\
	*(u32*)(r7 + 0) = r0;				\
	*(u64*)(r7 + 4) = r0;				\
	r4 = r7;					\
	/* bpf_strtoul() */				\
	call %[bpf_strtoul];				\
	r0 = 1;						\

Annotation

Implementation Notes