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256eab48e7
In preparation of skipping emitting static variables in BPF skeletons, switch all current selftests uses of static variables to pass data between BPF and user-space to use global variables. All non-read-only `static volatile` variables become just plain global variables by dropping `static volatile` part. Read-only `static volatile const` variables, though, still require `volatile` modifier, otherwise compiler will ignore whatever values are set from user-space. Few static linker tests are using name-conflicting static variables to validate that static linker still properly handles static variables and doesn't trip up on name conflicts. Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20210507054119.270888-4-andrii@kernel.org
20 lines
414 B
C
20 lines
414 B
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2021 Google LLC. */
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#include <linux/bpf.h>
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#include <bpf/bpf_helpers.h>
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/* The format string is filled from the userspace such that loading fails */
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const char fmt[10];
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SEC("raw_tp/sys_enter")
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int handler(const void *ctx)
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{
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unsigned long long arg = 42;
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bpf_snprintf(NULL, 0, fmt, &arg, sizeof(arg));
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return 0;
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}
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char _license[] SEC("license") = "GPL";
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