releases/5.0.5/objtool-move-objtool_file-struct-off-the-stack.patch

   1 From 0c671812f152b628bd87c0af49da032cc2a2c319 Mon Sep 17 00:00:00 2001
   2 From: Josh Poimboeuf <jpoimboe@redhat.com>
   3 Date: Mon, 18 Mar 2019 19:09:38 -0500
   4 Subject: objtool: Move objtool_file struct off the stack
   5
   6 From: Josh Poimboeuf <jpoimboe@redhat.com>
   7
   8 commit 0c671812f152b628bd87c0af49da032cc2a2c319 upstream.
   9
  10 Objtool uses over 512k of stack, thanks to the hash table embedded in
  11 the objtool_file struct.  This causes an unnecessarily large stack
  12 allocation and breaks users with low stack limits.
  13
  14 Move the struct off the stack.
  15
  16 Fixes: 042ba73fe7eb ("objtool: Add several performance improvements")
  17 Reported-by: Vassili Karpov <moosotc@gmail.com>
  18 Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
  19 Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
  20 Cc: Peter Zijlstra <peterz@infradead.org>
  21 Cc: stable@vger.kernel.org
  22 Link: https://lkml.kernel.org/r/df92dcbc4b84b02ffa252f46876df125fb56e2d7.1552954176.git.jpoimboe@redhat.com
  23 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
  24
  25 ---
  26  tools/objtool/check.c |    3 ++-
  27  1 file changed, 2 insertions(+), 1 deletion(-)
  28
  29 --- a/tools/objtool/check.c
  30 +++ b/tools/objtool/check.c
  31 @@ -2184,9 +2184,10 @@ static void cleanup(struct objtool_file
  32         elf_close(file->elf);
  33  }
  34
  35 +static struct objtool_file file;
  36 +
  37  int check(const char *_objname, bool orc)
  38  {
  39 -       struct objtool_file file;
  40         int ret, warnings = 0;
  41
  42         objname = _objname;