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6a82601477
When selftests are built with a new enough clang, the arena selftests
opt-in to use LLVM address_space attribute annotations for arena
pointers.
These annotations are not emitted by kfunc prototype generation. This
causes compilation errors when clang sees conflicting prototypes.
Fix by opting arena selftests out of using generated kfunc prototypes.
Fixes: 770abbb5a2 ("bpftool: Support dumping kfunc prototypes from BTF")
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/r/202406131810.c1B8hTm8-lkp@intel.com/
Signed-off-by: Daniel Xu <dxu@dxuuu.xyz>
Link: https://lore.kernel.org/r/fc59a617439ceea9ad8dfbb4786843c2169496ae.1718295425.git.dxu@dxuuu.xyz
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
70 lines
1.6 KiB
C
70 lines
1.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2024 Meta Platforms, Inc. and affiliates. */
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#define BPF_NO_KFUNC_PROTOTYPES
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#include <vmlinux.h>
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#include <bpf/bpf_helpers.h>
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#include <bpf/bpf_tracing.h>
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#include "bpf_misc.h"
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#include "bpf_experimental.h"
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#include "bpf_arena_common.h"
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#define ARENA_SIZE (1ull << 32)
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struct {
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__uint(type, BPF_MAP_TYPE_ARENA);
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__uint(map_flags, BPF_F_MMAPABLE);
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__uint(max_entries, ARENA_SIZE / PAGE_SIZE);
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} arena SEC(".maps");
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SEC("syscall")
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__success __retval(0)
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int big_alloc1(void *ctx)
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{
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#if defined(__BPF_FEATURE_ADDR_SPACE_CAST)
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volatile char __arena *page1, *page2, *no_page, *page3;
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void __arena *base;
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page1 = base = bpf_arena_alloc_pages(&arena, NULL, 1, NUMA_NO_NODE, 0);
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if (!page1)
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return 1;
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*page1 = 1;
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page2 = bpf_arena_alloc_pages(&arena, base + ARENA_SIZE - PAGE_SIZE,
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1, NUMA_NO_NODE, 0);
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if (!page2)
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return 2;
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*page2 = 2;
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no_page = bpf_arena_alloc_pages(&arena, base + ARENA_SIZE,
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1, NUMA_NO_NODE, 0);
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if (no_page)
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return 3;
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if (*page1 != 1)
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return 4;
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if (*page2 != 2)
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return 5;
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bpf_arena_free_pages(&arena, (void __arena *)page1, 1);
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if (*page2 != 2)
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return 6;
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if (*page1 != 0) /* use-after-free should return 0 */
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return 7;
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page3 = bpf_arena_alloc_pages(&arena, NULL, 1, NUMA_NO_NODE, 0);
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if (!page3)
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return 8;
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*page3 = 3;
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if (page1 != page3)
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return 9;
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if (*page2 != 2)
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return 10;
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if (*(page1 + PAGE_SIZE) != 0)
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return 11;
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if (*(page1 - PAGE_SIZE) != 0)
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return 12;
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if (*(page2 + PAGE_SIZE) != 0)
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return 13;
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if (*(page2 - PAGE_SIZE) != 0)
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return 14;
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#endif
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return 0;
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}
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char _license[] SEC("license") = "GPL";
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