Orange Pi PC: /usr/bin/su is a x86-64 binary

[AlexaDP]

I just discovered that /usr/bin/su in my Armbian:

 

 v26.2.1 for Orange Pi PC running Armbian Linux 6.12.58-current-sunxi
 

is a x86_64 binary:

 

$ ls -l /usr/bin/su
-rwsr-xr-x 1 root root 50800 Mar  6 13:10 /usr/bin/su

 

$ file /usr/bin/su
/usr/bin/su: setuid ELF 64-bit LSB executable, x86-64, version 1 (SYSV), statically linked, no section header
 

I installed the rust version, su-rs, but I thought it would be useful to warn about this. 

 

I checked /usr/bin and /usr/sbin and this is the only x86-64 executable.

Edited 16 hours ago by AlexaDP

[bedna]

Yes, applications are compiled into binaries, su is not a script.

 

This is on for example Arch:

$ file $(which su)

/usr/bin/su: setuid ELF 64-bit LSB pie executable, x86-64, version 1 (SYSV), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, BuildID[sha1]=d47af40eeb87fea42d555df0d1385bc9a4b4df2c, for GNU/Linux 4.4.0, stripped

 

Quote

I installed the rust version, su-rs, but I thought it would be useful to warn about this. 

 

Ok? So it's compiled with rust instead of C, still a binary.

 

Quote

I checked /usr/bin and /usr/sbin and this is the only x86-64 executable.

 

I find that extremely hard impossible to believe.

 

https://www.reddit.com/r/learnprogramming/comments/lyw9gf/can_someone_explain_what_people_mean_by_binaries

Edited 8 hours ago by bedna

[AlexaDP]

Bedna

 

I know that su  command is a compiled binary but Orange Pi PC has a 32 bit ARM processor and not a 64 bit Intel (x86_64) processor.

 

I find that extremely hard and impossible to believe that you missed the point.

Edited 6 hours ago by AlexaDP

[Werner]

If this is really the case, then this must be an upstream issue since Armbian does not touch this file AFAIK.

 

Picked a random userspace from armhf (since you did not state which you are using)

 

~/build/cache/rootfs/bin# file su
su: setuid ELF 32-bit LSB pie executable, ARM, EABI5 version 1 (SYSV), dynamically linked, interpreter /lib/ld-linux-armhf.so.3, BuildID[sha1]=b24ceef58082e181650b17e52819559be2d3a97b, for GNU/Linux 3.2.0, stripped