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libbpf: Append "..." in fixed up log if CO-RE spec is truncated

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Detect CO-RE spec truncation and append "..." to make user aware that
there was supposed to be more of the spec there.

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20220428041523.4089853-2-andrii@kernel.org
This commit is contained in:
Andrii Nakryiko
2022-04-27 21:15:20 -07:00
committed by Andrii Nakryiko
parent 97ab064bc0
commit 1a18c6f051
1 changed files with 4 additions and 4 deletions
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8
src/libbpf.c
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@@ -6962,7 +6962,7 @@ static void fixup_log_failed_core_relo(struct bpf_program *prog,
const struct bpf_core_relo *relo; const struct bpf_core_relo *relo;
struct bpf_core_spec spec; struct bpf_core_spec spec;
char patch[512], spec_buf[256]; char patch[512], spec_buf[256];
int insn_idx, err; int insn_idx, err, spec_len;
if (sscanf(line1, "%d: (%*d) call unknown#195896080\n", &insn_idx) != 1) if (sscanf(line1, "%d: (%*d) call unknown#195896080\n", &insn_idx) != 1)
return; return;
@@ -6975,11 +6975,11 @@ static void fixup_log_failed_core_relo(struct bpf_program *prog,
if (err) if (err)
return; return;
bpf_core_format_spec(spec_buf, sizeof(spec_buf), &spec); spec_len = bpf_core_format_spec(spec_buf, sizeof(spec_buf), &spec);
snprintf(patch, sizeof(patch), snprintf(patch, sizeof(patch),
"%d: <invalid CO-RE relocation>\n" "%d: <invalid CO-RE relocation>\n"
"failed to resolve CO-RE relocation %s\n", "failed to resolve CO-RE relocation %s%s\n",
insn_idx, spec_buf); insn_idx, spec_buf, spec_len >= sizeof(spec_buf) ? "..." : "");
patch_log(buf, buf_sz, log_sz, line1, line3 - line1, patch); patch_log(buf, buf_sz, log_sz, line1, line3 - line1, patch);
} }