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disallow running chrootless as root without fakeroot unless --skip=check/chrootless is used

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Johannes Schauer Marin Rodrigues 2024-01-08 22:37:13 +01:00
parent ae6dcc001d
commit 428ee78121
Signed by untrusted user: josch
GPG key ID: F2CBA5C78FBD83E1
3 changed files with 15 additions and 5 deletions
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16
mmdebstrap
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@ -4939,9 +4939,17 @@ sub main() {
test_unshare_userns(1); test_unshare_userns(1);
} }
} elsif ($options->{mode} eq 'chrootless') { } elsif ($options->{mode} eq 'chrootless') {
if ($EFFECTIVE_USER_ID == 0) { if (any { $_ eq 'check/chrootless' } @{ $options->{skip} }) {
warning "running chrootless mode as root might damage the host " info "skipping check/chrootless as requested";
. "system"; } else {
my $ischroot = 0 == system 'ischroot';
if ( $EFFECTIVE_USER_ID == 0
&& !exists $ENV{FAKEROOTKEY}
&& !$ischroot) {
error
"running chrootless mode as root without fakeroot might "
. "damage the host system if not run inside a chroot";
}
} }
} else { } else {
error "unknown mode: $options->{mode}"; error "unknown mode: $options->{mode}";
@ -7240,6 +7248,8 @@ Upon startup, several checks are carried out, like:
=item * which mode to use and whether prerequisites are met =item * which mode to use and whether prerequisites are met
=item * do not allow chrootless mode as root (without fakeroot) unless inside a chroot. This check can be disabled using B<--skip=check/chrootless>
=item * whether the requested architecture can be executed (requires arch-test) using qemu binfmt_misc support. This requires arch-test and can be disabled using B<--skip=check/qemu> =item * whether the requested architecture can be executed (requires arch-test) using qemu binfmt_misc support. This requires arch-test and can be disabled using B<--skip=check/qemu>
=item * how the apt sources can be assembled from I<SUITE>, I<MIRROR> and B<--components> and/or from standard input as deb822 or one-line format and whether the required GPG keys exist. =item * how the apt sources can be assembled from I<SUITE>, I<MIRROR> and B<--components> and/or from standard input as deb822 or one-line format and whether the required GPG keys exist.

2
tests/chrootless
View file

@ -8,7 +8,7 @@ trap "rm -f /tmp/chrootless.tar /tmp/root.tar" EXIT INT TERM
for INCLUDE in '' 'apt' 'apt,build-essential' 'systemd-sysv'; do for INCLUDE in '' 'apt' 'apt,build-essential' 'systemd-sysv'; do
for MODE in root chrootless; do for MODE in root chrootless; do
{{ CMD }} --mode=$MODE --variant={{ VARIANT }} --hook-dir=./hooks/merged-usr \ {{ CMD }} --mode=$MODE --variant={{ VARIANT }} --hook-dir=./hooks/merged-usr \
${INCLUDE:+--include="$INCLUDE"} \ ${INCLUDE:+--include="$INCLUDE"} --skip=check/chrootless \
{{ DIST }} "/tmp/$MODE.tar" {{ MIRROR }} {{ DIST }} "/tmp/$MODE.tar" {{ MIRROR }}
done done
cmp /tmp/root.tar /tmp/chrootless.tar || diffoscope /tmp/root.tar /tmp/chrootless.tar cmp /tmp/root.tar /tmp/chrootless.tar || diffoscope /tmp/root.tar /tmp/chrootless.tar

2
tests/chrootless-foreign
View file

@ -45,7 +45,7 @@ for INCLUDE in '' 'apt' 'systemd-sysv'; do
arch-test "$arch" && exit 1 arch-test "$arch" && exit 1
{{ CMD }} --mode=chrootless --architecture="$arch" --variant={{ VARIANT }} \ {{ CMD }} --mode=chrootless --architecture="$arch" --variant={{ VARIANT }} \
--hook-dir=./hooks/merged-usr ${INCLUDE:+--include="$INCLUDE"} \ --hook-dir=./hooks/merged-usr ${INCLUDE:+--include="$INCLUDE"} \
{{ DIST }} "/tmp/chrootless.tar" {{ MIRROR }} --skip=check/chrootless {{ DIST }} "/tmp/chrootless.tar" {{ MIRROR }}
# when creating a foreign architecture chroot, the tarballs are not # when creating a foreign architecture chroot, the tarballs are not
# bit-by-bit identical but contain a few remaining differences: # bit-by-bit identical but contain a few remaining differences:
# #