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[Launchpad Bug Tracker <1860548@xxxxxxxxxxxxxxxxxx>]

You have been subscribed to a public bug by Ioanna Alifieraki (joalif):

[Description]

Systemd crashes when logging very long messages. This regression was introduced with
upstream commit d054f0a4d451 [1] due to xsprintf.
Commits e68eedbbdc98 [2] and 574432f889ce [3] replace some uses of xsprintf with 
snprintf and fix it.

[Test Case]

# systemd-run --scope apt-get -q -y -o DPkg::Options::=--force-confold
-o DPkg::Options::=--force-confdef --allow-unauthenticated install acl
adduser amd64-microcode apt base-files base-passwd bash bash-completion
bind9-host binfmt-support binutils-common binutils-x86-64-linux-gnu
bsdmainutils bsdutils busybox-initramfs busybox-static bzip2 ca-
certificates console-setup console-setup-linux coreutils cpio cpp cpp-7
crda cron curl dash dbus dctrl-tools debconf debconf-i18n debianutils
dictionaries-common diffutils dirmngr distro-info-data dmeventd dmsetup
dnsmasq-base dnsutils dpkg e2fslibs e2fsprogs ed eject fakeroot fdisk
file findutils friendly-recovery gawk gcc-7-base gcc-8-base gettext-base
gir1.2-glib-2.0 gnupg gnupg-l10n gnupg-utils gpg gpg-agent gpg-wks-
client gpg-wks-server gpgconf gpgsm gpgv grep groff-base grub-common
grub-pc grub-pc-bin grub2-common gzip hostname info init init-system-
helpers initramfs-tools initramfs-tools-bin initramfs-tools-core
install-info intel-microcode iproute2 iptables iputils-ping iputils-
tracepath irqbalance isc-dhcp-client isc-dhcp-common iso-codes iw
keyboard-configuration keyutils klibc-utils kmod krb5-locales krb5-user
language-pack-en language-pack-en-base language-pack-gnome-en language-
pack-gnome-en-base less libaccountsservice0 libacl1 libapparmor1
libargon2-0 libasan4 libasn1-8-heimdal libassuan0 libatm1 libatomic1
libattr1 libaudit-common libaudit1  libbinutils libblkid1 libbsd0
libbz2-1.0 libc-bin libc-dev-bin libc6 libc6-dev libcap-ng0 libcap2
libcap2-bin libcc1-0 libcilkrts5 libcom-err2 libcryptsetup12
libcurl3-gnutls libcurl4 libdb5.3 libdbus-1-3 libdebconfclient0
libdevmapper-event1.02.1 libdevmapper1.02.1 libdpkg-perl libdrm-common
libdrm2 libdumbnet1 libedit2 libelf1 libestr0 libevent-2.1-6 libexpat1
libexpat1-dev libext2fs2 libfakeroot libfastjson4 libfdisk1 libffi6
libfreetype6 libfribidi0 libfuse2 libgc1c2 libgcc-7-dev libgcc1
libgcrypt20 libgdbm-compat4 libgeoip1 libgirepository-1.0-1 libglib2.0-0
libglib2.0-data libgmp10 libgnutls30 libgomp1 libgpg-error0 libgpm2
libgssapi-krb5-2 libgssapi3-heimdal libgssrpc4 libhcrypto4-heimdal
libheimbase1-heimdal libheimntlm0-heimdal libhogweed4 libhx509-5-heimdal
libitm1 libjs-jquery libjs-sphinxdoc libjs-underscore libk5crypto3
libkadm5clnt-mit11 libkadm5srv-mit11 libkdb5-9 libkeyutils1 libkmod2
libkrb5-26-heimdal libkrb5-3 libkrb5support0 libksba8 libldap-2.4-2
libldap-common liblocale-gettext-perl liblsan0 liblz4-1 liblzma5
libmagic-mgc libmagic1 libmnl0 libmount1 libmpc3 libmpdec2 libmpfr6
libmpx2 libmspack0 libncurses5 libncursesw5 libnetfilter-conntrack3
libnettle6 libnewt0.52 libnfnetlink0 libnfsidmap2 libnghttp2-14
libnl-3-200 libnl-genl-3-200 libnorm1 libnpth0 libnss-systemd libnuma1
libp11-kit0 libpam-cap libpam-krb5 libpam-modules libpam-modules-bin
libpam-runtime libpam-systemd libpam0g libparted2 libpcap0.8 libpci3
libpcre3 libpgm-5.2-0 libpipeline1 libplymouth4 libpng16-16 libpolkit-
gobject-1-0 libpopt0 libpsl5 libpython-all-dev libpython-dev libpython-
stdlib libpython2.7 libpython2.7-dev libpython2.7-minimal


# tail -f /var/log/syslog
...
Jan 22 12:50:33 bionic-kernel systemd[1]: Assertion 'xsprintf: buf[] must be big enough' failed at ../src/core/job.c:803, function job_log_status_message(). Aborting.

Broadcast message from systemd-journald@bionic-kernel (Wed 2020-01-22
12:50:33 UTC):

systemd[1]: Caught <ABRT>, dumped core as pid 14620.


Broadcast message from systemd-journald@bionic-kernel (Wed 2020-01-22 12:50:33 UTC):

systemd[1]: Freezing execution.

Jan 22 12:50:33 bionic-kernel systemd[1]: Caught <ABRT>, dumped core as pid 14620.
Jan 22 12:50:33 bionic-kernel systemd[1]: Freezing execution.


[Regression Potential]

The patches replace xsprintf with snprintf and the regression potential
is small.

[Other]

Only Bionic is affected.

[1] https://github.com/systemd/systemd/issues/4534
[2] https://github.com/systemd/systemd/commit/e68eedbbdc98fa13449756b7fee3bed689d76493 
[3] https://github.com/systemd/systemd/commit/574432f889ce3de126bbc6736bcbd22ee170ff82

** Affects: systemd (Ubuntu)
     Importance: Medium
     Assignee: Ioanna Alifieraki (joalif)
         Status: Fix Released

** Affects: systemd (Ubuntu Bionic)
     Importance: Medium
     Assignee: Ioanna Alifieraki (joalif)
         Status: Confirmed

** Affects: systemd (Ubuntu Disco)
     Importance: Undecided
         Status: Fix Released

** Affects: systemd (Ubuntu Eoan)
     Importance: Undecided
         Status: Fix Released

-- 
systemd crashes when logging long message 
https://bugs.launchpad.net/bugs/1860548
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