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Enable Clang's -ftrivial-auto-var-init=zero on supported kernels

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Signed-off-by: Tad <tad@spotco.us>
This commit is contained in:
Tad 2022-03-31 20:27:25 -04:00
parent 256df737a3
commit e2c499dd24
5 changed files with 60 additions and 0 deletions
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22
Patches/Common/android_kernel_common/0001-auto_var_init.patch Normal file
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@ -0,0 +1,22 @@
From 919a61dedb0458ebd52291cb6d4948446fad4b44 Mon Sep 17 00:00:00 2001
From: Daniel Micay <danielmicay@gmail.com>
Date: Wed, 8 Apr 2020 11:10:43 -0400
Subject: [PATCH] enable -ftrivial-auto-var-init=zero
---
Makefile | 2 ++
1 file changed, 2 insertions(+)
diff --git a/Makefile b/Makefile
index 79e2a78a7e92..abc66c11c84a 100644
--- a/Makefile
+++ b/Makefile
@@ -770,6 +770,8 @@ KBUILD_CFLAGS += -fomit-frame-pointer
endif
endif
+KBUILD_CFLAGS += -ftrivial-auto-var-init=zero -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
+
KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments)
ifdef CONFIG_DEBUG_INFO

35
Scripts/Common/Functions.sh
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@ -536,6 +536,41 @@ hardenBootArgs() {
}
export -f hardenBootArgs;
enableAutoVarInit() {
cd "$DOS_BUILD_BASE";
for kernel in "${DOS_AUTOVARINIT_KERNELS[@]}"
do
if [ -d "$DOS_BUILD_BASE/kernel/$kernel" ]; then
cd "$DOS_BUILD_BASE/kernel/$kernel";
if git apply --check "$DOS_PATCHES_COMMON/android_kernel_common/0001-auto_var_init.patch" &> /dev/null; then
if git apply "$DOS_PATCHES_COMMON/android_kernel_common/0001-auto_var_init.patch" &> /dev/null; then #(GrapheneOS)
echo "auto-var-init: Enabled for $kernel";
else
echo "auto-var-init: Failed to enable for $kernel";
fi;
elif git apply --check --reverse "$DOS_PATCHES_COMMON/android_kernel_common/0001-auto_var_init.patch" &> /dev/null; then
echo "auto-var-init: Already enabled for $kernel";
elif grep -q "trivial-auto-var-init=pattern" Makefile; then
sed -i 's/ftrivial-auto-var-init=pattern/ftrivial-auto-var-init=zero -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang/' Makefile; #(GrapheneOS)
grep -q "trivial-auto-var-init=pattern" Makefile;
if [ $? -eq 0 ]; then
echo "auto-var-init: Failed to switch from pattern to zero on $kernel";
else
echo "auto-var-init: Switched from pattern to zero on $kernel";
fi;
elif grep -q "trivial-auto-var-init=zero" Makefile; then
echo "auto-var-init: Already enabled for $kernel";
else
echo "auto-var-init: Could not enable for $kernel";
fi;
# else
# echo "auto-var-init: $kernel not in tree";
fi;
done;
cd "$DOS_BUILD_BASE";
}
export -f enableAutoVarInit;
disableEnforceRRO() {
cd "$DOS_BUILD_BASE$1";
awk -i inplace '!/PRODUCT_ENFORCE_RRO_TARGETS .= framework-res/' *.mk &>/dev/null || true;

1
Scripts/LineageOS-17.1/Patch.sh
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@ -482,6 +482,7 @@ if [ "$DOS_GRAPHENE_EXEC" = true ]; then find "device" -maxdepth 2 -mindepth 2 -
cd "$DOS_BUILD_BASE";
deblobAudio;
removeBuildFingerprints;
enableAutoVarInit;
#Tweaks for <2GB RAM devices
#enableLowRam "device/motorola/harpia";

1
Scripts/LineageOS-18.1/Patch.sh
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@ -576,6 +576,7 @@ if [ "$DOS_GRAPHENE_EXEC" = true ]; then find "device" -maxdepth 2 -mindepth 2 -
cd "$DOS_BUILD_BASE";
deblobAudio;
removeBuildFingerprints;
enableAutoVarInit;
#Tweaks for <2GB RAM devices
#enableLowRam "device/samsung/serrano3gxx";

1
Scripts/init.sh
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@ -78,6 +78,7 @@ export DOS_SENSORS_PERM_NEW=true;
export DOS_STRONG_ENCRYPTION_ENABLED=false; #Set true to enable AES 256-bit FDE encryption on 14.1+15.1 XXX: THIS WILL **DESTROY** EXISTING INSTALLS!
export DOS_WEBVIEW_LFS=true; #Whether to `git lfs pull` in the WebView repository
#alias DOS_WEBVIEW_CHERRYPICK='git pull "https://github.com/LineageOS/android_external_chromium-webview" refs/changes/00/316600/2';
export DOS_AUTOVARINIT_KERNELS=('essential/msm8998' 'fxtec/msm8998' 'google/coral' 'google/msm-4.9' 'google/redbull' 'google/sunfish' 'google/wahoo' 'oneplus/msm8996' 'oneplus/msm8998' 'oneplus/sdm845' 'oneplus/sm7250' 'oneplus/sm8150' 'razer/msm8998' 'razer/sdm845' 'sony/sdm660' 'sony/sdm845' 'xiaomi/sdm660' 'xiaomi/sdm845' 'xiaomi/sm6150' 'xiaomi/sm8150' 'xiaomi/sm8250' 'zuk/msm8996');
#Servers
export DOS_DEFAULT_DNS_PRESET="Quad9"; #Sets default DNS. Options: See changeDefaultDNS() in Scripts/Common/Functions.sh