1 // SPDX-License-Identifier: GPL-2.0 2 /* Copyright (c) 2024 Meta Platforms, Inc. and affiliates. */ 3 4 #define BPF_NO_KFUNC_PROTOTYPES 5 #include <vmlinux.h> 6 #include <bpf/bpf_helpers.h> 7 #include <bpf/bpf_tracing.h> 8 #include "bpf_misc.h" 9 #include "bpf_experimental.h" 10 #include "bpf_arena_common.h" 11 12 #define ARENA_SIZE (1ull << 32) 13 14 struct { 15 __uint(type, BPF_MAP_TYPE_ARENA); 16 __uint(map_flags, BPF_F_MMAPABLE); 17 __uint(max_entries, ARENA_SIZE / PAGE_SIZE); 18 } arena SEC(".maps"); 19 20 SEC("syscall") 21 __success __retval(0) 22 int big_alloc1(void *ctx) 23 { 24 #if defined(__BPF_FEATURE_ADDR_SPACE_CAST) 25 volatile char __arena *page1, *page2, *no_page, *page3; 26 void __arena *base; 27 28 page1 = base = bpf_arena_alloc_pages(&arena, NULL, 1, NUMA_NO_NODE, 0); 29 if (!page1) 30 return 1; 31 *page1 = 1; 32 page2 = bpf_arena_alloc_pages(&arena, base + ARENA_SIZE - PAGE_SIZE, 33 1, NUMA_NO_NODE, 0); 34 if (!page2) 35 return 2; 36 *page2 = 2; 37 no_page = bpf_arena_alloc_pages(&arena, base + ARENA_SIZE, 38 1, NUMA_NO_NODE, 0); 39 if (no_page) 40 return 3; 41 if (*page1 != 1) 42 return 4; 43 if (*page2 != 2) 44 return 5; 45 bpf_arena_free_pages(&arena, (void __arena *)page1, 1); 46 if (*page2 != 2) 47 return 6; 48 if (*page1 != 0) /* use-after-free should return 0 */ 49 return 7; 50 page3 = bpf_arena_alloc_pages(&arena, NULL, 1, NUMA_NO_NODE, 0); 51 if (!page3) 52 return 8; 53 *page3 = 3; 54 if (page1 != page3) 55 return 9; 56 if (*page2 != 2) 57 return 10; 58 if (*(page1 + PAGE_SIZE) != 0) 59 return 11; 60 if (*(page1 - PAGE_SIZE) != 0) 61 return 12; 62 if (*(page2 + PAGE_SIZE) != 0) 63 return 13; 64 if (*(page2 - PAGE_SIZE) != 0) 65 return 14; 66 #endif 67 return 0; 68 } 69 char _license[] SEC("license") = "GPL"; 70