[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

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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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