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1ae6aa6195
Extend the snprintf_btf test with type_ids from the vmlinux BTF that used to NULL-deref in the BTF show path: a "const void", checked to render the "<unsupported kind:0>" placeholder, and a BTF_KIND_VAR, checked to resolve and render without error. The program renders from its own buffer and the test picks a VAR whose resolved type fits it, so the render stays in bounds. Signed-off-by: Jiayuan Chen <jiayuan.chen@linux.dev> Link: https://lore.kernel.org/r/20260901104924.346187-6-jiayuan.chen@linux.dev Signed-off-by: Alexei Starovoitov <ast@kernel.org>
25 lines
463 B
C
25 lines
463 B
C
// SPDX-License-Identifier: GPL-2.0
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#include "btf_ptr.h"
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#include <bpf/bpf_helpers.h>
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__u32 type_id;
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/* A buffer we own to render the selected type from, kept in bounds. */
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char obj[256];
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char out[64];
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long ret;
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SEC("raw_tp/sys_enter")
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int dump_type(void *ctx)
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{
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struct btf_ptr ptr = {
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.ptr = obj,
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.type_id = type_id,
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.flags = 0,
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};
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ret = bpf_snprintf_btf(out, sizeof(out), &ptr, sizeof(ptr), 0);
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return 0;
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}
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char _license[] SEC("license") = "GPL";
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