linux-kernel - Re: perf probe can't remove probes

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Date:   Tue, 1 Dec 2020 10:43:09 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     Jiri Olsa <jolsa@...nel.org>, Namhyung Kim <namhyung@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Clark Williams <williams@...hat.com>,
        linux-perf-users@...r.kernel.org
Subject: Re: perf probe can't remove probes

Em Tue, Dec 01, 2020 at 10:25:17AM -0300, Arnaldo Carvalho de Melo escreveu:
> Hi Masami,
 
> 	Any idea why listing the source code doesn't work while simply
> adding the probe works?

<SNIP>
 
> [root@...enth ~]# perf probe -L verify_pkcs7_signature
> Specified source line is not found.
>   Error: Failed to show lines.

Yeah, those fixes you sent, when cherry-picked into this bpf-next/master
based branch, do the trick, so nevermind, you fixed this already, these
fixes were already merged by Linus, bpf-next will rebase at some point,
etc. :-)

- Arnaldo

[acme@...e bpf]$ git log --oneline -4
0f3147557ea8143d (HEAD -> bpfsign) perf probe: Change function definition check due to broken DWARF
0e104f490d8f86b4 perf probe: Fix to die_entrypc() returns error correctly
9423e1f089643738 libbpf: Check if the kernel supports signatures before associating them
580616996c498b70 libbpf: Attach signature ELF sections to signed ELF program sections
[acme@...e bpf]$

[root@...enth ~]# perf probe -L verify_pkcs7_signature
<verify_pkcs7_signature@...me/acme/git/bpf/certs/system_keyring.c:0>
      0  int verify_pkcs7_signature(const void *data, size_t len,
                                   const void *raw_pkcs7, size_t pkcs7_len,
                                   struct key *trusted_keys,
                                   enum key_being_used_for usage,
                                   int (*view_content)(void *ctx,
                                                       const void *data, size_t len,
                                                       size_t asn1hdrlen),
                                   void *ctx)
         {
      9         struct pkcs7_message *pkcs7;
                int ret;

                pkcs7 = pkcs7_parse_message(raw_pkcs7, pkcs7_len);
     13         if (IS_ERR(pkcs7))
     14                 return PTR_ERR(pkcs7);

     16         ret = verify_pkcs7_message_sig(data, len, pkcs7, trusted_keys, usage,
                                               view_content, ctx);

     19         pkcs7_free_message(pkcs7);
     20         pr_devel("<==%s() = %d\n", __func__, ret);
                return ret;
         }
         EXPORT_SYMBOL_GPL(verify_pkcs7_signature);

[root@...enth ~]#