Re: [PATCH v3 04/17] module: ensure __cfi_check alignment

From: Jessica Yu
Date: Mon Mar 29 2021 - 05:27:00 EST


+++ Sami Tolvanen [23/03/21 13:39 -0700]:
CONFIG_CFI_CLANG_SHADOW assumes the __cfi_check() function is page
aligned and at the beginning of the .text section. While Clang would
normally align the function correctly, it fails to do so for modules
with no executable code.

This change ensures the correct __cfi_check() location and
alignment. It also discards the .eh_frame section, which Clang can
generate with certain sanitizers, such as CFI.

Link: https://bugs.llvm.org/show_bug.cgi?id=46293
Signed-off-by: Sami Tolvanen <samitolvanen@xxxxxxxxxx>

Acked-by: Jessica Yu <jeyu@xxxxxxxxxx>

Thanks!