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overlay/boot-mount-generator: Mount /boot{,efi} read-only,nodev,nosuid #659

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Jan 7, 2021
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overlay/boot-mount-generator: Mount /boot{,efi} read-only,nodev,nosuid #659

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14 changes: 10 additions & 4 deletions overlay.d/05core/usr/lib/systemd/system-generators/coreos-boot-mount-generator
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Original file line number Diff line number Diff line change
Expand Up @@ -35,8 +35,9 @@ fi
mk_mount() {
local mount_pt="${1}"; shift
local label="${1}"; shift
local path="/dev/disk/by-label/${label}"
local options="${1}"; shift

local path="/dev/disk/by-label/${label}"
local unit_name=$(systemd-escape -p ${mount_pt} --suffix=mount)

eval $(udevadm info --query property --export "${path}")
Expand All @@ -61,15 +62,20 @@ After=systemd-fsck@${device}.service
[Mount]
What=${path}
Where=${mount_pt}
Options=${options}
EOF

add_wants "${unit_name}"
}


# Don't create mount units for /boot or /boot/efi on live systems.
# Don't create mount units for /boot on live systems.
# ConditionPathExists won't work here because conditions don't affect
# the dependency on the underlying device unit.
if [ ! -f /run/ostree-live ]; then
mk_mount /boot boot
# We mount read-only by default mostly to protect
# against accidental damage. Only a few things
# owned by CoreOS should be touching /boot or the ESP.
# Use nodev,nosuid because some hardening guides want
# that even though it's of minimal value.
mk_mount /boot boot ro,nodev,nosuid
fi
13 changes: 9 additions & 4 deletions tests/kola/misc-ro
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Expand Up @@ -51,10 +51,15 @@ if ip link | grep -o -e " eth[0-9]:"; then
fi
ok nic naming

if test -w /sysroot; then
fatal "found writable /sysroot"
fi
ok sysroot ro
for part in /sysroot /boot; do
if ! findmnt -n -o options ${part} | grep -q "ro,"; then
fatal "${part} is missing ro option"
fi
if test -w "${part}" || touch "${part}/somefile" 2>/dev/null; then
fatal "${part} is writable"
fi
done
ok read-only partitions

if ! lsattr -d / | grep -qe '--i--'; then
fatal "missing immutable bit on /"
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