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scripts: stop the guest tmpfs from starving the target #196

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Merged
morehouse merged 1 commit into from
Aug 10, 2026
+8 −1
Merged

scripts: stop the guest tmpfs from starving the target #196

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9 changes: 8 additions & 1 deletion scripts/setup-nyx.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -88,6 +88,11 @@ cat > "$SHAREDIR/fuzz_no_pt.sh" << 'EOF'
chmod +x hget
cp hget /tmp
cd /tmp
# /tmp is a tmpfs holding the tarball, the tree extracted from it, and the
# target's runtime writes. Its default cap is half the VM's RAM, too low to
# unpack a 600 MB image below 3 GB. The guest has no swap, so leave 10% for
# anonymous memory.
mount -o remount,size=90% /tmp
echo 0 > /proc/sys/kernel/randomize_va_space
echo 0 > /proc/sys/kernel/printk
./hget hcat_no_pt hcat
Expand All @@ -100,7 +105,9 @@ ip addr add 127.0.0.1/8 dev lo
ip addr add ::1/128 dev lo
ip link set lo up
ip a | ./hcat
mkdir rootfs/ && tar -xf container.tar -C /tmp/rootfs
# Drop the tarball once unpacked; keeping it would pin a second copy of the
# image in tmpfs for the life of the VM.
mkdir rootfs/ && tar -xf container.tar -C /tmp/rootfs && rm -f container.tar
mount -t proc /proc rootfs/proc/
mount --rbind /sys rootfs/sys/
mount --rbind /dev rootfs/dev/
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