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

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 Alexei Starovoitov
parent 32c03c4954
commit b198881d4b
1 changed files with 4 additions and 4 deletions
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8
tools/lib/bpf/libbpf.c
View File

@ -6962,7 +6962,7 @@ static void fixup_log_failed_core_relo(struct bpf_program *prog,
const struct bpf_core_relo *relo;
struct bpf_core_spec spec;
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)
return;
@ -6975,11 +6975,11 @@ static void fixup_log_failed_core_relo(struct bpf_program *prog,
if (err)
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),
"%d: <invalid CO-RE relocation>\n"
"failed to resolve CO-RE relocation %s\n",
insn_idx, spec_buf);
"failed to resolve CO-RE relocation %s%s\n",
insn_idx, spec_buf, spec_len >= sizeof(spec_buf) ? "..." : "");
patch_log(buf, buf_sz, log_sz, line1, line3 - line1, patch);
}