[NTLUG:Discuss] C Program Woes on Ubuntu

[Eric Schnoebelen]

/run is mounted noexec by default on late model debian derived
systems.


Jay Urish writes:
- SElinux?
-
-
- On 05/31/2018 01:39 PM, George Lass wrote:
- > I'm not exactly sure why, but apparently Ubuntu will not allow
- > execution of *anything* in sub directories below /run. I was
- > logged into my server via ssh as root (not sudo'ed). I created
- > a directory called bin (/run/bin) and tried to build and execute
- > my C program there. Copying the executable *anywhere* else
- > allows it to be executed.
- > Thanks all,
- > George
- >
- >        From: Lee Heath <madhat at gmail.com>
- >   To: George Lass <george.lass at sbcglobal.net>; NTLUG Discussion List <dis
- cuss at ntlug.org>
- >   Sent: Thursday, May 31, 2018 12:47 PM
- >   Subject: Re: [NTLUG:Discuss] C Program Woes on Ubuntu
- >     
- > Do you have selinux enabled?
- > https://en.wikipedia.org/wiki/Security-Enhanced_Linux
- >
- > $ sudo getenforce
- > [sudo] password for me:
- > Disabled
- >
- > Have you check the logs?
- >
- > $ sudo grep -r x-bash /var/log/*
- >
- >
- >> On May 31, 2018, at 12:26 PM, George Lass <george.lass at sbcglobal.net> wr
- ote:
- >>
- >> I have just installed Ubuntu 18.04 LTS on a 4 or 5 year old Dell PowerEd
- ge R210 II.  I have updated and upgraded to the latest versions of everyth
- ing.  I am having problems trying to execute even the simplest C Language 
- program:
- >> #include <stdio.h>
- >> int main(int argc, char *argv[]){        printf("this is a test"); 
-        return 0;}
- >>
- >> No problem building the executable from the source file x.c:
- >> # make xcc      x.c      -o x
- >> But I am unable to actually run the executable:
- >> # ./x-bash: ./x: Permission denied
- >>
- >> It isn't a problem with file permission:
- >> # ls -l x-rwxr-xr-x 1 root root 8288 May 31 12:19 x
- >>
- >> And I don't *think* it's a compatibility issue with shared objects since
-  it seems to use the same library as bash:
- >> # file xx: ELF 64-bit LSB shared object, x86-64, version 1 (SYSV), dynam
- ically linked, interpreter /lib64/ld-linux-x86-64.so.2, for GNU/Linux 3.2.0
- , BuildID[sha1]=4167fc090a21cefc7aa84aae77c4203bb35ac56b, not stripped
- >>
- >> # file /bin/bash/bin/bash: ELF 64-bit LSB shared object, x86-64, version
-  1 (SYSV), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, for
-  GNU/Linux 3.2.0, BuildID[sha1]=b636f50d85c3cca7cf2518030446660c1d90d660, s
- tripped
- >> Does anyone have any ideas as to what is going on?
- >> Thanks,
- >> George Lass
- >>
- >> _______________________________________________
- >> http://www.ntlug.org/mailman/listinfo/discuss
- > Lee Heath
- > InfoSec Mercenary
- > @unspecific
- >
- >
- >
- >     
- > _______________________________________________
- > http://www.ntlug.org/mailman/listinfo/discuss
-
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