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Linux user/initrd modules #59

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0f05693
linux-user: install modules in generated initrd
Wenzel Mar 31, 2025
c9d0d67
gitignore: generated files
Wenzel Mar 31, 2025
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5 changes: 5 additions & 0 deletions linux-user/dvkm/.gitignore
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Original file line number Diff line number Diff line change
Expand Up @@ -2,3 +2,8 @@
sharedir/dvkm.ko
sharedir/fuzz_dvkm

Module.symvers
modules.order
.modules.order.cmd
.Module.symvers.cmd

6 changes: 5 additions & 1 deletion linux-user/dvkm/Makefile
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Original file line number Diff line number Diff line change
Expand Up @@ -8,6 +8,7 @@ MAKEF_DIR := $(shell dirname $(realpath $(firstword $(MAKEFILE_LIST))))
EXAMPLES_ROOT := $(KAFL_ROOT)/examples
LINUX_AGENT_DIR := $(EXAMPLES_ROOT)/linux-user/linux_kafl_agent
GEN_INITRD_DIR := $(EXAMPLES_ROOT)/linux-user/scripts
INITRD_MODULES_STAGING_DIR := $(GEN_INITRD_DIR)/modules
DVKM_DIR := $(MAKEF_DIR)/Damn_Vulnerable_Kernel_Module

# Artifacts
Expand Down Expand Up @@ -38,8 +39,11 @@ $(LINUX_AGENT_BZIMAGE):
$(MAKE) -C $(LINUX_AGENT_DIR) olddefconfig
$(MAKE) -C $(LINUX_AGENT_DIR) -j $(shell nproc)

modules: $(LINUX_AGENT_BZIMAGE)
$(MAKE) -C $(LINUX_AGENT_DIR) modules_install INSTALL_MOD_PATH=$(INITRD_MODULES_STAGING_DIR)

# Build initrd
$(KAFL_INITRD_PATH):
$(KAFL_INITRD_PATH): modules
$(MAKE) -C $(GEN_INITRD_DIR)

# Build dvkm.ko (and test_dvkm)
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2 changes: 2 additions & 0 deletions linux-user/scripts/.gitignore
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Original file line number Diff line number Diff line change
@@ -1,2 +1,4 @@
# ignore build output
*.cpio.gz

modules/
1 change: 1 addition & 0 deletions linux-user/scripts/Makefile
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Expand Up @@ -9,6 +9,7 @@ all: $(TARGET)

clean:
rm -f $(TARGET)
rm -rf $(MAKEF_DIR)/modules

# build vmcall if needed
$(VMCALL_BIN):
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7 changes: 7 additions & 0 deletions linux-user/scripts/gen_initrd.sh
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Expand Up @@ -18,8 +18,10 @@
set -e
set -u

SCRIPT_DIR=$( cd -- "$( dirname -- "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )
SCRIPT_ROOT=$EXAMPLES_ROOT/linux-user
TEMPLATE=$SCRIPT_ROOT/initrd_template
MODULES_STAGING_DIR=$SCRIPT_DIR/modules

fatal() {
echo
Expand Down Expand Up @@ -76,6 +78,11 @@ function inject_files()
echo "Install $dep => $TARGET_ROOT/$dep"
install -D "$dep" $TARGET_ROOT/"$dep"
done

if [ -d "$MODULES_STAGING_DIR" ]; then
echo "[*] Copying modules..."
rsync -av "$MODULES_STAGING_DIR/" "$TARGET_ROOT/"
fi
}

function build_image()
Expand Down