From 0c78757010a17173bdc79b818133697e7dcbf6a4 Mon Sep 17 00:00:00 2001 From: David Kalnischkies Date: Mon, 17 Nov 2014 15:06:35 +0100 Subject: [PATCH] close leaking slave fd after setting up pty magic The fd moves out of scope here anyway, so we should close it properly instead of leaking it which will tickle down to dpkg maintainer scripts. Closes: 767774 --- apt-pkg/deb/dpkgpm.cc | 6 +- test/integration/framework | 71 +++++++++++++++---- .../test-failing-maintainer-scripts | 46 +----------- .../test-no-fds-leaked-to-maintainer-scripts | 40 +++++++++++ 4 files changed, 103 insertions(+), 60 deletions(-) create mode 100755 test/integration/test-no-fds-leaked-to-maintainer-scripts diff --git a/apt-pkg/deb/dpkgpm.cc b/apt-pkg/deb/dpkgpm.cc index 3f6039e0d..dd03eac2c 100644 --- a/apt-pkg/deb/dpkgpm.cc +++ b/apt-pkg/deb/dpkgpm.cc @@ -1158,8 +1158,7 @@ void pkgDPkgPM::SetupSlavePtyMagic() int const slaveFd = open(d->slave, O_RDWR); if (slaveFd == -1) _error->FatalE("open", _("Can not write log (%s)"), _("Is /dev/pts mounted?")); - - if (ioctl(slaveFd, TIOCSCTTY, 0) < 0) + else if (ioctl(slaveFd, TIOCSCTTY, 0) < 0) _error->FatalE("ioctl", "Setting TIOCSCTTY for slave fd %d failed!", slaveFd); else { @@ -1170,6 +1169,9 @@ void pkgDPkgPM::SetupSlavePtyMagic() if (tcsetattr(0, TCSANOW, &d->tt) < 0) _error->FatalE("tcsetattr", "Setting in Setup via TCSANOW for slave fd %d failed!", slaveFd); } + + if (slaveFd != -1) + close(slaveFd); } void pkgDPkgPM::StopPtyMagic() { diff --git a/test/integration/framework b/test/integration/framework index 51c7b8cae..ff059f59e 100644 --- a/test/integration/framework +++ b/test/integration/framework @@ -358,6 +358,54 @@ configdpkg() { fi } +configdpkgnoopchroot() { + # create a library to noop chroot() and rewrite maintainer script executions + # via execvp() as used by dpkg as we don't want our rootdir to be a fullblown + # chroot directory dpkg could chroot into to execute the maintainer scripts + msgtest 'Building library to preload to make maintainerscript work in' 'dpkg' + cat << EOF > noopchroot.c +#define _GNU_SOURCE +#include +#include +#include +#include + +static char * chrootdir = NULL; + +int chroot(const char *path) { + printf("WARNING: CHROOTing to %s was ignored!\n", path); + free(chrootdir); + chrootdir = strdup(path); + return 0; +} +int execvp(const char *file, char *const argv[]) { + static int (*func_execvp) (const char *, char * const []) = NULL; + if (func_execvp == NULL) + func_execvp = (int (*) (const char *, char * const [])) dlsym(RTLD_NEXT, "execvp"); + if (chrootdir == NULL || strncmp(file, "/var/lib/dpkg/", strlen("/var/lib/dpkg/")) != 0) + return func_execvp(file, argv); + printf("REWRITE execvp call %s into %s\n", file, chrootdir); + char newfile[strlen(chrootdir) + strlen(file)]; + strcpy(newfile, chrootdir); + strcat(newfile, file); + return func_execvp(newfile, argv); +} +EOF + testsuccess --nomsg gcc -fPIC -shared -o noopchroot.so noopchroot.c -ldl + + mkdir -p "${TMPWORKINGDIRECTORY}/rootdir/usr/bin/" + DPKG="${TMPWORKINGDIRECTORY}/rootdir/usr/bin/dpkg" + echo "#!/bin/sh +if [ -n \"\$LD_PRELOAD\" ]; then + export LD_PRELOAD=\"${TMPWORKINGDIRECTORY}/noopchroot.so \${LD_PRELOAD}\" +else + export LD_PRELOAD=\"${TMPWORKINGDIRECTORY}/noopchroot.so\" +fi +dpkg \"\$@\"" > $DPKG + chmod +x $DPKG + sed -ie "s|^DPKG::options:: \"dpkg\";\$|DPKG::options:: \"$DPKG\";|" aptconfig.conf +} + configallowinsecurerepositories() { echo "Acquire::AllowInsecureRepositories \"$1\";" > rootdir/etc/apt/apt.conf.d/allow-insecure-repositories.conf @@ -480,7 +528,7 @@ buildsimplenativepackage() { fi local BUILDDIR=${TMPWORKINGDIRECTORY}/incoming/${NAME}-${VERSION} - msgninfo "Build package ${NAME} in ${VERSION} for ${RELEASE} in ${DISTSECTION}… " + msgtest "Build source package in version ${VERSION} for ${RELEASE} in ${DISTSECTION}" "$NAME" mkdir -p $BUILDDIR/debian/source echo "* most suckless software product ever" > ${BUILDDIR}/FEATURES echo "#!/bin/sh @@ -512,7 +560,10 @@ Package: $NAME" >> ${BUILDDIR}/debian/control echo "Description: $DESCRIPTION" >> ${BUILDDIR}/debian/control echo '3.0 (native)' > ${BUILDDIR}/debian/source/format - (cd ${BUILDDIR}/..; dpkg-source -b ${NAME}-${VERSION} 2>&1) | sed -n 's#^dpkg-source: info: building [^ ]\+ in ##p' \ + cd ${BUILDDIR}/.. + testsuccess --nomsg dpkg-source -b ${NAME}-${VERSION} + cd - >/dev/null + sed -n 's#^dpkg-source: info: building [^ ]\+ in ##p' ${TMPWORKINGDIRECTORY}/rootdir/tmp/testsuccess.output \ | while read SRC; do echo "pool/${SRC}" >> ${BUILDDIR}/../${RELEASE}.${DISTSECTION}.srclist # if expr match "${SRC}" '.*\.dsc' >/dev/null 2>&1; then @@ -524,6 +575,7 @@ Package: $NAME" >> ${BUILDDIR}/debian/control done for arch in $(getarchitecturesfromcommalist "$ARCH"); do + msgtest "Build binary package for ${RELEASE} in ${SECTION}" "$NAME" rm -rf ${BUILDDIR}/debian/tmp mkdir -p ${BUILDDIR}/debian/tmp/DEBIAN ${BUILDDIR}/debian/tmp/usr/share/doc/${NAME} ${BUILDDIR}/debian/tmp/usr/bin cp ${BUILDDIR}/debian/copyright ${BUILDDIR}/debian/changelog ${BUILDDIR}/FEATURES ${BUILDDIR}/debian/tmp/usr/share/doc/${NAME} @@ -537,11 +589,7 @@ Package: $NAME" >> ${BUILDDIR}/debian/control local LOG="${BUILDDIR}/../${NAME}_${VERSION}_${arch}.dpkg-deb.log" # ensure the right permissions as dpkg-deb ensists chmod 755 ${BUILDDIR}/debian/tmp/DEBIAN - if ! dpkg-deb -Z${COMPRESS_TYPE} --build ${BUILDDIR}/debian/tmp ${BUILDDIR}/.. >$LOG 2>&1; then - cat $LOG - false - fi - rm $LOG + testsuccess --nomsg dpkg-deb -Z${COMPRESS_TYPE} --build ${BUILDDIR}/debian/tmp ${BUILDDIR}/.. echo "pool/${NAME}_${VERSION}_${arch}.deb" >> ${BUILDDIR}/../${RELEASE}.${DISTSECTION}.pkglist done @@ -559,15 +607,13 @@ buildpackage() { local ARCH=$(getarchitecture $4) local PKGNAME="$(echo "$BUILDDIR" | grep -o '[^/]*$')" local BUILDLOG="$(readlink -f "${BUILDDIR}/../${PKGNAME}_${RELEASE}_${SECTION}.dpkg-bp.log")" - msgninfo "Build package ${PKGNAME} for ${RELEASE} in ${SECTION}… " + msgtest "Build package for ${RELEASE} in ${SECTION}" "$PKGNAME" cd $BUILDDIR if [ "$ARCH" = "all" ]; then ARCH="$(dpkg-architecture -qDEB_HOST_ARCH 2> /dev/null)" fi - if ! dpkg-buildpackage -uc -us -a$ARCH >$BUILDLOG 2>&1 ; then - cat $BUILDLOG - false - fi + testsuccess --nomsg dpkg-buildpackage -uc -us -a$ARCH + cp ${TMPWORKINGDIRECTORY}/rootdir/tmp/testsuccess.output $BUILDLOG local PKGS="$(grep '^dpkg-deb: building package' $BUILDLOG | cut -d'/' -f 2 | sed -e "s#'\.##")" local SRCS="$(grep '^dpkg-source: info: building' $BUILDLOG | grep -o '[a-z0-9._+~-]*$')" cd - > /dev/null @@ -577,7 +623,6 @@ buildpackage() { for SRC in $SRCS; do echo "pool/${SRC}" >> ${TMPWORKINGDIRECTORY}/incoming/${RELEASE}.${SECTION}.srclist done - msgdone "info" } buildaptarchive() { diff --git a/test/integration/test-failing-maintainer-scripts b/test/integration/test-failing-maintainer-scripts index 3dd7d643e..953506aa5 100755 --- a/test/integration/test-failing-maintainer-scripts +++ b/test/integration/test-failing-maintainer-scripts @@ -6,6 +6,7 @@ TESTDIR=$(readlink -f $(dirname $0)) setupenvironment configarchitecture 'native' +configdpkgnoopchroot # create a bunch of failures createfailure() { @@ -25,51 +26,6 @@ createfailure 'postrm' setupaptarchive -# create a library to noop chroot() and rewrite maintainer script executions -# via execvp() as used by dpkg as we don't want our rootdir to be a fullblown -# chroot directory dpkg could chroot into to execute the maintainer scripts -cat << EOF > noopchroot.c -#define _GNU_SOURCE -#include -#include -#include -#include - -static char * chrootdir = NULL; - -int chroot(const char *path) { - printf("WARNING: CHROOTing to %s was ignored!\n", path); - free(chrootdir); - chrootdir = strdup(path); - return 0; -} -int execvp(const char *file, char *const argv[]) { - static int (*func_execvp) (const char *, char * const []) = NULL; - if (func_execvp == NULL) - func_execvp = (int (*) (const char *, char * const [])) dlsym(RTLD_NEXT, "execvp"); - if (chrootdir == NULL || strncmp(file, "/var/lib/dpkg/", strlen("/var/lib/dpkg/")) != 0) - return func_execvp(file, argv); - printf("REWRITE execvp call %s into %s\n", file, chrootdir); - char newfile[strlen(chrootdir) + strlen(file)]; - strcpy(newfile, chrootdir); - strcat(newfile, file); - return func_execvp(newfile, argv); -} -EOF -testsuccess gcc -fPIC -shared -o noopchroot.so noopchroot.c -ldl - -mkdir -p "${TMPWORKINGDIRECTORY}/rootdir/usr/bin/" -DPKG="${TMPWORKINGDIRECTORY}/rootdir/usr/bin/dpkg" -echo "#!/bin/sh -if [ -n \"\$LD_PRELOAD\" ]; then - export LD_PRELOAD=\"${TMPWORKINGDIRECTORY}/noopchroot.so \${LD_PRELOAD}\" -else - export LD_PRELOAD=\"${TMPWORKINGDIRECTORY}/noopchroot.so\" -fi -dpkg \"\$@\"" > $DPKG -chmod +x $DPKG -sed -ie "s|^DPKG::options:: \"dpkg\";\$|DPKG::options:: \"$DPKG\";|" aptconfig.conf - # setup some pre- and post- invokes to check the output isn't garbled later APTHOOK="${TMPWORKINGDIRECTORY}/rootdir/usr/bin/apthook" echo '#!/bin/sh diff --git a/test/integration/test-no-fds-leaked-to-maintainer-scripts b/test/integration/test-no-fds-leaked-to-maintainer-scripts new file mode 100755 index 000000000..6ed120090 --- /dev/null +++ b/test/integration/test-no-fds-leaked-to-maintainer-scripts @@ -0,0 +1,40 @@ +#!/bin/sh +set -e + +TESTDIR=$(readlink -f $(dirname $0)) +. $TESTDIR/framework + +setupenvironment +configarchitecture 'native' +configdpkgnoopchroot + +setupsimplenativepackage "fdleaks" 'native' '1.0' 'unstable' +BUILDDIR="incoming/fdleaks-1.0" +for script in 'preinst' 'postinst' 'prerm' 'postrm'; do + echo '#!/bin/sh +ls -l /proc/self/fd/' > ${BUILDDIR}/debian/$script +done +buildpackage "$BUILDDIR" 'unstable' 'main' 'native' +rm -rf "$BUILDDIR" + +setupaptarchive + +testsuccess aptget install -y fdleaks +msgtest 'Check if fds were not' 'leaked' +if [ "$(grep 'root root' rootdir/tmp/testsuccess.output | wc -l)" = '8' ]; then + msgpass +else + echo + cat rootdir/tmp/testsuccess.output + msgfail +fi + +testsuccess aptget purge -y fdleaks +msgtest 'Check if fds were not' 'leaked' +if [ "$(grep 'root root' rootdir/tmp/testsuccess.output | wc -l)" = '12' ]; then + msgpass +else + echo + cat rootdir/tmp/testsuccess.output + msgfail +fi -- 2.45.2