[Buildroot] sudo: error while loading shared libraries
Uwe Fechner
uwe.fechner at nl.abb.com
Thu May 6 11:34:13 UTC 2021
Dear all,
I fixed the problem with sudo by adding the following symlink:
[/lib]$ ls -la libsudo_util.so.0
lrwxrwxrwx 1 root root 35 May 5 18:28 libsudo_util.so.0 -> /usr/libexec/sudo/libsudo_util.so.0
But this is more a workaround.
readelf -d sudo
has the following output:
Dynamic section at offset 0x20b14 contains 34 entries:
Tag Type Name/Value
0x00000001 (NEEDED) Shared library: [libutil.so.1]
0x00000001 (NEEDED) Shared library: [libsudo_util.so.0]
0x00000001 (NEEDED) Shared library: [libpthread.so.0]
0x00000001 (NEEDED) Shared library: [libdl.so.2]
0x00000001 (NEEDED) Shared library: [libc.so.6]
0x00000001 (NEEDED) Shared library: [ld-linux-armhf.so.3]
0x0000001d (RUNPATH) Library runpath: [libexec/sudo]
0x0000000c (INIT) 0x2f1c
The library runpath is wrong, it should be /usr/libexec/sudo .
Or the package sudo should install libsudo_util.so.0 in the folder /lib.
My conclusion is that there is a bug in the package sudo, version 1.9.5p2 .
Any comments?
Uwe
________________________________
From: buildroot <buildroot-bounces at busybox.net> on behalf of Uwe Fechner <uwe.fechner at nl.abb.com>
Sent: Wednesday, May 5, 2021 1:14 PM
To: Thomas Petazzoni <thomas.petazzoni at bootlin.com>
Cc: buildroot at busybox.net <buildroot at busybox.net>
Subject: Re: [Buildroot] sudo: error while loading shared libraries
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Dear Thomas,
Thanks for looking into this issue, but your suggestion did not help:
$ LD_LIBRARY_PATH=/usr/libexec/sudo sudo dmesg
sudo: error while loading shared libraries: libsudo_util.so.0: cannot open shared object file: No such file or directory
Any other idea?
Uwe
________________________________
From: Thomas Petazzoni <thomas.petazzoni at bootlin.com>
Sent: Tuesday, May 4, 2021 9:43 PM
To: Uwe Fechner <uwe.fechner at nl.abb.com>
Cc: buildroot at busybox.net <buildroot at busybox.net>
Subject: Re: [Buildroot] sudo: error while loading shared libraries
This email originated from outside of your organization. Please do not click on links or open attachments unless you recognize the sender and know the content is safe.
Hello Uwe,
On Tue, 4 May 2021 11:18:59 +0000
Uwe Fechner <uwe.fechner at nl.abb.com> wrote:
> Hello,
>
> we are using buildroot on i.mx6 since a long time.
>
> Since yesterday I get the following error with the sudo package:
>
> sudo dmesg
> sudo: error while loading shared libraries: libsudo_util.so.0: cannot open shared object file: No such file or directory
>
> We are using sudo-1.9.5p2 .
>
> The library exists and the permissions seem to be correct:
>
>
> ls -la /usr/libexec/sudo
Based on the error message, it seems like the library is not dlopen()ed
but directly linked into sudo. Hwoever, /usr/libexec/sudo is not in the
default search path for libraries, and therefore unless the sudo binary
has a RPATH/RUNPATH pointing to /usr/libexec/sudo, I believe what
you're seeing is expected.
To verify this, you can try:
LD_LIBRARY_PATH=/usr/libexec/sudo sudo dmesg
Really, I think libsudo_util.so has no business in /usr/libexec/sudo,
it should be in /usr/lib. Based on the names of the other .so files,
they look like dlopen()ed libraries, which can stay in
/usr/libexec/sudo.
> total 588
> drwxr-xr-x 2 root root 4096 May 3 19:31 .
> drwxr-xr-x 11 root root 4096 May 3 19:31 ..
> -rw-r--r-- 1 root root 17716 May 3 19:31 audit_json.so
> -rw-r--r-- 1 root root 9380 May 3 19:31 group_file.so
> lrwxrwxrwx 1 root root 21 May 3 19:31 libsudo_util.so -> libsudo_util.so.0.0.0
> lrwxrwxrwx 1 root root 21 May 3 19:31 libsudo_util.so.0 -> libsudo_util.so.0.0.0
> -rwxr-xr-x 1 root root 112412 May 3 19:31 libsudo_util.so.0.0.0
> -rw-r--r-- 1 root root 5284 May 3 19:31 sample_approval.so
> -rw-r--r-- 1 root root 420184 May 3 19:31 sudoers.so
> -rw-r--r-- 1 root root 5260 May 3 19:31 sudo_noexec.so
> -rw-r--r-- 1 root root 5276 May 3 19:31 system_group.so
>
> Any idea?
Best regards,
Thomas
--
Thomas Petazzoni, co-owner and CEO, Bootlin
Embedded Linux and Kernel engineering
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