[PATCH] perf kmem: Fix ELF header errors during "perf kmem record"

[Pekka Enberg]

The write_event() function in builtin-record.c writes out all mmap()'d DSOs
including non-ELF files like GNOME resource files and such. Therefore, check
for ELF_K_ELF in filename__read_build_id() before attempting to read the ELF
header with gelf_getehdr().

Fixes the following error messages when running "perf kmem record":

  penberg@penberg-laptop:~/src/linux/tools/perf$ perf kmem record
  ^C[ perf record: Woken up 2 times to write data ]
  [ perf record: Captured and wrote 0.753 MB perf.data (~32885 samples) ]
  filename__read_build_id: cannot get elf header.
  filename__read_build_id: cannot get elf header.
  filename__read_build_id: cannot get elf header.
  filename__read_build_id: cannot get elf header.
  filename__read_build_id: cannot get elf header.
  filename__read_build_id: cannot get elf header.
  filename__read_build_id: cannot get elf header.
  filename__read_build_id: cannot get elf header.
  filename__read_build_id: cannot get elf header.

Cc: Li Zefan <lizf@xxxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx>
Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>
Signed-off-by: Pekka Enberg <penberg@xxxxxxxxxxxxxx>
---
 tools/perf/util/symbol.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index 86ec6c7..f56158f 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -921,6 +921,7 @@ int filename__read_build_id(const char *filename, void *bf, size_t size)
 	GElf_Shdr shdr;
 	Elf_Data *data;
 	Elf_Scn *sec;
+	Elf_Kind ek;
 	void *ptr;
 	Elf *elf;
 
@@ -937,6 +938,10 @@ int filename__read_build_id(const char *filename, void *bf, size_t size)
 		goto out_close;
 	}
 
+	ek = elf_kind(elf);
+	if (ek != ELF_K_ELF)
+		goto out_elf_end;
+
 	if (gelf_getehdr(elf, &ehdr) == NULL) {
 		pr_err("%s: cannot get elf header.\n", __func__);
 		goto out_elf_end;
-- 
1.6.0.4

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