Package: util-linux
Version: 2.29-1
Severity: important
File: /sbin/sulogin
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sulogin does not exit after timeout expires. This is serious
for any remote system configured with SULOGIN=yes since it
means that manual intervention is required to boot the system.
Reproducing the issue is simple: Just run sulogin with a short
timeout and observe that it doesn't exit.
strace shows that it does set an alarm, which is triggered,
but sulogin falls back to read() instead of exiting:
root@miraculix:/tmp# strace -ttf sulogin -t 3
15:18:25.711747 execve("/sbin/sulogin", ["sulogin", "-t", "3"], [/* 54 vars
*/]) = 0
..
15:18:25.728448 ioctl(0, TIOCGWINSZ, {ws_row=46, ws_col=221, ws_xpixel=1787,
ws_ypixel=740}) = 0
15:18:25.728487 ioctl(0, TCGETS, {B38400 opost isig icanon echo ...}) = 0
15:18:25.728518 ioctl(0, SNDCTL_TMR_START or TCSETS, {B38400 opost -isig
-icanon -echo ...}) = 0
15:18:25.728547 ioctl(0, TCGETS, {B38400 opost -isig -icanon -echo ...}) = 0
15:18:25.728577 fcntl(0, F_GETFL) = 0x8002 (flags O_RDWR|O_LARGEFILE)
15:18:25.728605 fcntl(0, F_SETFL, O_RDWR|O_LARGEFILE) = 0
15:18:25.728633 getpgid(0) = 17003
15:18:25.728660 getppid() = 17003
15:18:25.728687 getpgid(17003) = 17003
15:18:25.728714 ioctl(0, TIOCGPGRP, [17003]) = 0
15:18:25.728747 dup2(0, 0) = 0
15:18:25.728774 dup2(0, 1) = 1
15:18:25.728805 dup2(0, 2) = 2
15:18:25.728832 ioctl(0, TCGETS, {B38400 opost -isig -icanon -echo ...}) = 0
15:18:25.728890 ioctl(0, SNDCTL_TMR_STOP or TCSETSW, {B38400 opost -isig
-icanon -echo ...}) = 0
15:18:25.728916 ioctl(0, TCGETS, {B38400 opost -isig -icanon -echo ...}) = 0
15:18:25.728950 fcntl(0, F_GETFL) = 0x8002 (flags O_RDWR|O_LARGEFILE)
15:18:25.729003 fstat(0, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 0), ...})
= 0
15:18:25.729056 write(0, "Give root password for maintenan"..., 35Give root
password for maintenance
) = 35
15:18:25.729106 write(0, "(or press Control-D to continue)"..., 34(or press
Control-D to continue): ) = 34
15:18:25.729135 ioctl(0, TCGETS, {B38400 opost -isig -icanon -echo ...}) = 0
15:18:25.729162 ioctl(0, SNDCTL_TMR_STOP or TCSETSW, {B38400 opost -isig
-icanon -echo ...}) = 0
15:18:25.729186 ioctl(0, TCGETS, {B38400 opost -isig -icanon -echo ...}) = 0
15:18:25.729213 ioctl(0, TCGETS, {B38400 opost -isig -icanon -echo ...}) = 0
15:18:25.729238 ioctl(0, SNDCTL_TMR_CONTINUE or TCSETSF, {B38400 opost -isig
-icanon -echo ...}) = 0
15:18:25.729264 ioctl(0, TCGETS, {B38400 opost -isig -icanon -echo ...}) = 0
15:18:25.729291 rt_sigaction(SIGALRM, {0x55a41bcac870, [], SA_RESTORER,
0x7f7d12322040}, NULL, 8) = 0
15:18:25.729330 alarm(3) = 0
15:18:25.729384 read(0, 0x7ffd819e1668, 1) = ? ERESTARTSYS (To be restarted if
SA_RESTART is set)
15:18:28.730057 --- SIGALRM {si_signo=SIGALRM, si_code=SI_KERNEL} ---
15:18:28.730204 rt_sigreturn({mask=[]}) = -1 EINTR (Interrupted system call)
15:18:28.730491 nanosleep({0, 250000000}, NULL) = 0
15:18:28.980823 read(0,
Bjørn
- -- System Information:
Debian Release: stretch/sid
APT prefers unstable
APT policy: (500, 'unstable')
Architecture: amd64 (x86_64)
Foreign Architectures: i386
Kernel: Linux 4.8.0-1-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
Versions of packages util-linux depends on:
ii libblkid1 2.29-1
ii libc6 2.24-7
ii libfdisk1 2.29-1
ii libmount1 2.29-1
ii libncursesw5 6.0+20160917-1
ii libpam0g 1.1.8-3.3
ii libselinux1 2.6-3
ii libsmartcols1 2.29-1
ii libsystemd0 232-6
ii libtinfo5 6.0+20160917-1
ii libudev1 232-6
ii libuuid1 2.29-1
ii zlib1g 1:1.2.8.dfsg-2+b3
util-linux recommends no packages.
Versions of packages util-linux suggests:
ii dosfstools 4.0-2
ii kbd 2.0.3-2
ii util-linux-locales 2.29-1
- -- no debconf information
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