gcc-plugins/stackleak: Avoid .head.text section

JIRA: https://issues.redhat.com/browse/RHEL-39439

commit e7d24c0
Author: Ard Biesheuvel <ardb@kernel.org>
Date:   Thu Mar 28 07:42:57 2024 +0100

    gcc-plugins/stackleak: Avoid .head.text section

    The .head.text section carries the startup code that runs with the MMU
    off or with a translation of memory that deviates from the ordinary one.
    So avoid instrumentation with the stackleak plugin, which already avoids
    .init.text and .noinstr.text entirely.

    Fixes: 48204ab ("x86/sme: Move early SME kernel encryption handling into .head.text")
    Reported-by: kernel test robot <oliver.sang@intel.com>
    Closes: https://lore.kernel.org/oe-lkp/202403221630.2692c998-oliver.sang@intel.com
    Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
    Link: https://lore.kernel.org/r/20240328064256.2358634-2-ardb+git@google.com
    Signed-off-by: Kees Cook <keescook@chromium.org>

Signed-off-by: Bandan Das <bsd@redhat.com>

Author: whitebrandy

scripts/gcc-plugins/stackleak_plugin.c

@@ -446,6 +446,8 @@ static bool stackleak_gate(void)
 			return false;
 		if (!strncmp(TREE_STRING_POINTER(section), ".meminit.text", 13))
 			return false;
+		if (STRING_EQUAL(section, ".head.text"))
+			return false;
 	}
 
 	return track_frame_size >= 0;