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// SPDX-License-Identifier: GPL-2.0-only
/* Copyright (c) 2024 Yafang Shao <laoar.shao@gmail.com> */
#include "vmlinux.h"
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>
#include "bpf_misc.h"
#include "task_kfunc_common.h"
char _license[] SEC("license") = "GPL";
int bpf_iter_bits_new(struct bpf_iter_bits *it, const u64 *unsafe_ptr__ign,
u32 nr_bits) __ksym __weak;
int *bpf_iter_bits_next(struct bpf_iter_bits *it) __ksym __weak;
void bpf_iter_bits_destroy(struct bpf_iter_bits *it) __ksym __weak;
u64 bits_array[511] = {};
SEC("iter.s/cgroup")
__description("bits iter without destroy")
__failure __msg("Unreleased reference")
int BPF_PROG(no_destroy, struct bpf_iter_meta *meta, struct cgroup *cgrp)
{
struct bpf_iter_bits it;
u64 data = 1;
bpf_iter_bits_new(&it, &data, 1);
bpf_iter_bits_next(&it);
return 0;
}
SEC("iter/cgroup")
__description("uninitialized iter in ->next()")
__failure __msg("expected an initialized iter_bits as arg #0")
int BPF_PROG(next_uninit, struct bpf_iter_meta *meta, struct cgroup *cgrp)
{
struct bpf_iter_bits it = {};
bpf_iter_bits_next(&it);
return 0;
}
SEC("iter/cgroup")
__description("uninitialized iter in ->destroy()")
__failure __msg("expected an initialized iter_bits as arg #0")
int BPF_PROG(destroy_uninit, struct bpf_iter_meta *meta, struct cgroup *cgrp)
{
struct bpf_iter_bits it = {};
bpf_iter_bits_destroy(&it);
return 0;
}
SEC("syscall")
__description("null pointer")
__success __retval(0)
int null_pointer(void)
{
struct bpf_iter_bits iter;
int err, nr = 0;
int *bit;
err = bpf_iter_bits_new(&iter, NULL, 1);
bpf_iter_bits_destroy(&iter);
if (err != -EINVAL)
return 1;
bpf_for_each(bits, bit, NULL, 1)
nr++;
return nr;
}
SEC("syscall")
__description("bits copy")
__success __retval(10)
int bits_copy(void)
{
u64 data = 0xf7310UL; /* 4 + 3 + 2 + 1 + 0*/
int nr = 0;
int *bit;
bpf_for_each(bits, bit, &data, 1)
nr++;
return nr;
}
SEC("syscall")
__description("bits memalloc")
__success __retval(64)
int bits_memalloc(void)
{
u64 data[2];
int nr = 0;
int *bit;
__builtin_memset(&data, 0xf0, sizeof(data)); /* 4 * 16 */
bpf_for_each(bits, bit, &data[0], ARRAY_SIZE(data))
nr++;
return nr;
}
SEC("syscall")
__description("bit index")
__success __retval(8)
int bit_index(void)
{
u64 data = 0x100;
int bit_idx = 0;
int *bit;
bpf_for_each(bits, bit, &data, 1) {
if (*bit == 0)
continue;
bit_idx = *bit;
}
return bit_idx;
}
SEC("syscall")
__description("bits too big")
__success __retval(0)
int bits_too_big(void)
{
u64 data[4];
int nr = 0;
int *bit;
__builtin_memset(&data, 0xff, sizeof(data));
bpf_for_each(bits, bit, &data[0], 512) /* Be greater than 511 */
nr++;
return nr;
}
SEC("syscall")
__description("fewer words")
__success __retval(1)
int fewer_words(void)
{
u64 data[2] = {0x1, 0xff};
int nr = 0;
int *bit;
bpf_for_each(bits, bit, &data[0], 1)
nr++;
return nr;
}
SEC("syscall")
__description("zero words")
__success __retval(0)
int zero_words(void)
{
u64 data[2] = {0x1, 0xff};
int nr = 0;
int *bit;
bpf_for_each(bits, bit, &data[0], 0)
nr++;
return nr;
}
SEC("syscall")
__description("huge words")
__success __retval(0)
int huge_words(void)
{
u64 data[8] = {0x1, 0x1, 0x1, 0x1, 0x1, 0x1, 0x1, 0x1};
int nr = 0;
int *bit;
bpf_for_each(bits, bit, &data[0], 67108865)
nr++;
return nr;
}
SEC("syscall")
__description("max words")
__success __retval(4)
int max_words(void)
{
volatile int nr = 0;
int *bit;
bits_array[0] = (1ULL << 63) | 1U;
bits_array[510] = (1ULL << 33) | (1ULL << 32);
bpf_for_each(bits, bit, bits_array, 511) {
if (nr == 0 && *bit != 0)
break;
if (nr == 2 && *bit != 32672)
break;
nr++;
}
return nr;
}
SEC("syscall")
__description("bad words")
__success __retval(0)
int bad_words(void)
{
void *bad_addr = (void *)-4095;
struct bpf_iter_bits iter;
volatile int nr;
int *bit;
int err;
err = bpf_iter_bits_new(&iter, bad_addr, 1);
bpf_iter_bits_destroy(&iter);
if (err != -EFAULT)
return 1;
nr = 0;
bpf_for_each(bits, bit, bad_addr, 1)
nr++;
if (nr != 0)
return 2;
err = bpf_iter_bits_new(&iter, bad_addr, 4);
bpf_iter_bits_destroy(&iter);
if (err != -EFAULT)
return 3;
nr = 0;
bpf_for_each(bits, bit, bad_addr, 4)
nr++;
if (nr != 0)
return 4;
return 0;
}
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