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// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2024 Meta Platforms, Inc. and affiliates. */
#define BPF_NO_KFUNC_PROTOTYPES
#include <vmlinux.h>
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>
#include "bpf_misc.h"
#include "bpf_experimental.h"
#include "bpf_arena_common.h"
#define ARENA_SIZE (1ull << 32)
struct {
__uint(type, BPF_MAP_TYPE_ARENA);
__uint(map_flags, BPF_F_MMAPABLE);
__uint(max_entries, ARENA_SIZE / PAGE_SIZE);
} arena SEC(".maps");
SEC("syscall")
__success __retval(0)
int big_alloc1(void *ctx)
{
#if defined(__BPF_FEATURE_ADDR_SPACE_CAST)
volatile char __arena *page1, *page2, *no_page, *page3;
void __arena *base;
page1 = base = bpf_arena_alloc_pages(&arena, NULL, 1, NUMA_NO_NODE, 0);
if (!page1)
return 1;
*page1 = 1;
page2 = bpf_arena_alloc_pages(&arena, base + ARENA_SIZE - PAGE_SIZE,
1, NUMA_NO_NODE, 0);
if (!page2)
return 2;
*page2 = 2;
no_page = bpf_arena_alloc_pages(&arena, base + ARENA_SIZE,
1, NUMA_NO_NODE, 0);
if (no_page)
return 3;
if (*page1 != 1)
return 4;
if (*page2 != 2)
return 5;
bpf_arena_free_pages(&arena, (void __arena *)page1, 1);
if (*page2 != 2)
return 6;
if (*page1 != 0) /* use-after-free should return 0 */
return 7;
page3 = bpf_arena_alloc_pages(&arena, NULL, 1, NUMA_NO_NODE, 0);
if (!page3)
return 8;
*page3 = 3;
if (page1 != page3)
return 9;
if (*page2 != 2)
return 10;
if (*(page1 + PAGE_SIZE) != 0)
return 11;
if (*(page1 - PAGE_SIZE) != 0)
return 12;
if (*(page2 + PAGE_SIZE) != 0)
return 13;
if (*(page2 - PAGE_SIZE) != 0)
return 14;
#endif
return 0;
}
char _license[] SEC("license") = "GPL";
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