target/linux/generic/pending-6.6/981-gcc-plugins-stackleak-Avoid-.head.txt.section.patch

   1 From e7d24c0aa8e678f41457d1304e2091cac6fd1a2e Mon Sep 17 00:00:00 2001
   2 From: Ard Biesheuvel <ardb@kernel.org>
   3 Date: Thu, 28 Mar 2024 07:42:57 +0100
   4 Subject: gcc-plugins/stackleak: Avoid .head.text section
   5
   6 The .head.text section carries the startup code that runs with the MMU
   7 off or with a translation of memory that deviates from the ordinary one.
   8 So avoid instrumentation with the stackleak plugin, which already avoids
   9 .init.text and .noinstr.text entirely.
  10
  11 Fixes: 48204aba801f1b51 ("x86/sme: Move early SME kernel encryption handling into .head.text")
  12 Reported-by: kernel test robot <oliver.sang@intel.com>
  13 Closes: https://lore.kernel.org/oe-lkp/202403221630.2692c998-oliver.sang@intel.com
  14 Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
  15 Link: https://lore.kernel.org/r/20240328064256.2358634-2-ardb+git@google.com
  16 Signed-off-by: Kees Cook <keescook@chromium.org>
  17 ---
  18  scripts/gcc-plugins/stackleak_plugin.c | 2 ++
  19  1 file changed, 2 insertions(+)
  20
  21 --- a/scripts/gcc-plugins/stackleak_plugin.c
  22 +++ b/scripts/gcc-plugins/stackleak_plugin.c
  23 @@ -467,6 +467,8 @@ static bool stackleak_gate(void)
  24                         return false;
  25                 if (STRING_EQUAL(section, ".entry.text"))
  26                         return false;
  27 +               if (STRING_EQUAL(section, ".head.text"))
  28 +                       return false;
  29         }
  30
  31         return track_frame_size >= 0;