linux-kernel - [PATCH 5.1 101/138] perf header: Assign proper ff->ph in perf_event__synthesize

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Message-Id: <20190712121632.639643452@linuxfoundation.org>
Date:   Fri, 12 Jul 2019 14:19:25 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, David Carrillo Cisneros <davidca@...com>,
        Song Liu <songliubraving@...com>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>, kernel-team@...com
Subject: [PATCH 5.1 101/138] perf header: Assign proper ff->ph in perf_event__synthesize_features()

From: Song Liu <songliubraving@...com>

commit c952b35f4b15dd1b83e952718dec3307256383ef upstream.

bpf/btf write_* functions need ff->ph->env.

With this missing, pipe-mode (perf record -o -)  would crash like:

Program terminated with signal SIGSEGV, Segmentation fault.

This patch assign proper ph value to ff.

Committer testing:

  (gdb) run record -o -
  Starting program: /root/bin/perf record -o -
  PERFILE2
  <SNIP start of perf.data headers>
  Thread 1 "perf" received signal SIGSEGV, Segmentation fault.
  __do_write_buf (size=4, buf=0x160, ff=0x7fffffff8f80) at util/header.c:126
  126		memcpy(ff->buf + ff->offset, buf, size);
  (gdb) bt
  #0  __do_write_buf (size=4, buf=0x160, ff=0x7fffffff8f80) at util/header.c:126
  #1  do_write (ff=ff@...ry=0x7fffffff8f80, buf=buf@...ry=0x160, size=4) at util/header.c:137
  #2  0x00000000004eddba in write_bpf_prog_info (ff=0x7fffffff8f80, evlist=<optimized out>) at util/header.c:912
  #3  0x00000000004f69d7 in perf_event__synthesize_features (tool=tool@...ry=0x97cc00 <record>, session=session@...ry=0x7fffe9c6d010,
      evlist=0x7fffe9cae010, process=process@...ry=0x4435d0 <process_synthesized_event>) at util/header.c:3695
  #4  0x0000000000443c79 in record__synthesize (tail=tail@...ry=false, rec=0x97cc00 <record>) at builtin-record.c:1214
  #5  0x0000000000444ec9 in __cmd_record (rec=0x97cc00 <record>, argv=<optimized out>, argc=0) at builtin-record.c:1435
  #6  cmd_record (argc=0, argv=<optimized out>) at builtin-record.c:2450
  #7  0x00000000004ae3e9 in run_builtin (p=p@...ry=0x98e058 <commands+216>, argc=argc@...ry=3, argv=0x7fffffffd670) at perf.c:304
  #8  0x000000000042eded in handle_internal_command (argv=<optimized out>, argc=<optimized out>) at perf.c:356
  #9  run_argv (argcp=<optimized out>, argv=<optimized out>) at perf.c:400
  #10 main (argc=3, argv=<optimized out>) at perf.c:522
  (gdb)

After the patch the SEGSEGV is gone.

Reported-by: David Carrillo Cisneros <davidca@...com>
Signed-off-by: Song Liu <songliubraving@...com>
Tested-by: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Jiri Olsa <jolsa@...nel.org>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: kernel-team@...com
Cc: stable@...r.kernel.org # v5.1+
Fixes: 606f972b1361 ("perf bpf: Save bpf_prog_info information as headers to perf.data")
Link: http://lkml.kernel.org/r/20190620010453.4118689-1-songliubraving@fb.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 tools/perf/util/header.c |    1 +
 1 file changed, 1 insertion(+)

--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -3549,6 +3549,7 @@ int perf_event__synthesize_features(stru
 		return -ENOMEM;
 
 	ff.size = sz - sz_hdr;
+	ff.ph = &session->header;
 
 	for_each_set_bit(feat, header->adds_features, HEADER_FEAT_BITS) {
 		if (!feat_ops[feat].synthesize) {