linux-stable/scripts/gen-randstruct-seed.sh
Kees Cook be2b34fa9b randstruct: Move seed generation into scripts/basic/
To enable Clang randstruct support, move the structure layout
randomization seed generation out of scripts/gcc-plugins/ into
scripts/basic/ so it happens early enough that it can be used by either
compiler implementation. The gcc-plugin still builds its own header file,
but now does so from the common "randstruct.seed" file.

Cc: linux-hardening@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20220503205503.3054173-6-keescook@chromium.org
2022-05-08 01:33:07 -07:00

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#!/bin/sh
# SPDX-License-Identifier: GPL-2.0
SEED=$(od -A n -t x8 -N 32 /dev/urandom | tr -d ' \n')
echo "$SEED" > "$1"
HASH=$(echo -n "$SEED" | sha256sum | cut -d" " -f1)
echo "#define RANDSTRUCT_HASHED_SEED \"$HASH\"" > "$2"