Re: [Jailkit-users] problems running commands, differing ldd output

[Tzvi Edelman]

Hi Rich, thanks for taking a whack at this.

Running `which grep` does return "/bin/grep".

Here is my PATH:

  PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin

Running `ls -l /bin/grep` returns

  -rwxr-xr-x 1 root root 149536 May 27  2012 /bin/grep

I'm really curious why the execve fails with ENOENT. 

# strace from the bash session in which I invoked grep

/tmp/trace-20140426-213214.15117:write(2, "\10\10\10\10\10\10grep qtest /etc/passwd ", 29) = 29

# strace from the process attempting to launch grep (filtered for "grep")

/tmp/trace-20140426-213214.15274:execve("/bin/grep", ["grep", "qtest", "/etc/passwd"], [/* 7 vars */]) = -1 ENOENT (No such file or directory)

/tmp/trace-20140426-213214.15274:stat64("/bin/grep", {st_mode=S_IFREG|0755, st_size=149536, ...}) = 0

/tmp/trace-20140426-213214.15274:stat64("/bin/grep", {st_mode=S_IFREG|0755, st_size=149536, ...}) = 0

/tmp/trace-20140426-213214.15274:stat64("/bin/grep", {st_mode=S_IFREG|0755, st_size=149536, ...}) = 0

/tmp/trace-20140426-213214.15274:access("/bin/grep", X_OK)               = 0

/tmp/trace-20140426-213214.15274:stat64("/bin/grep", {st_mode=S_IFREG|0755, st_size=149536, ...}) = 0

/tmp/trace-20140426-213214.15274:access("/bin/grep", R_OK)               = 0

/tmp/trace-20140426-213214.15274:open("/bin/grep", O_RDONLY|O_LARGEFILE) = 3

/tmp/trace-20140426-213214.15274:write(2, "bash: /bin/grep: No such file or"..., 43) = 43

Do any of you any ideas about execve failure?

Thanks - Tzvi.

--

Tzvi Edelman cell:+972-50-849-8805  <address@hidden> H.323:tevid.no-ip.biz

On Sun, Apr 27, 2014 at 12:25 PM, Richard Scott <address@hidden> wrote:

Hi,

When in your jail try this:

 

$ which grep

does it list /bin/grep or say its not found?

If not found, your PATH isn't set correctly.

Rich

On 26/04/2014 23:50, Tzvi Edelman wrote:

Hi,

 

I am using jailkit-2.17 in debian wheezy, and seeing the following:

When I try to do something with grep in a jailed session, I get back

  bash: /bin/grep: No such file or directory

 

# ldd from outside the jail:

$ ldd /bin/grep

        /usr/lib/arm-linux-gnueabihf/libcofi_rpi.so (0xb6f90000)

        libdl.so.2 => /lib/arm-linux-gnueabihf/libdl.so.2 (0xb6f7a000)

        libgcc_s.so.1 => /lib/arm-linux-gnueabihf/libgcc_s.so.1 (0xb6f52000)

        libc.so.6 => /lib/arm-linux-gnueabihf/libc.so.6 (0xb6e23000)

        /lib/arm-linux-gnueabihf/ld-linux.so.3 => /lib/ld-linux-armhf.so.3 (0xb6f9d000)

 

# ldd from inside the jail:

$ ldd /bin/grep

libdl.so.2 => /lib/arm-linux-gnueabihf/libdl.so.2 (0xb6f74000)

libgcc_s.so.1 => /lib/arm-linux-gnueabihf/libgcc_s.so.1 (0xb6f4c000)

libc.so.6 => /lib/arm-linux-gnueabihf/libc.so.6 (0xb6e1d000)

/lib/arm-linux-gnueabihf/ld-linux.so.3 => /lib/ld-linux-armhf.so.3 (0xb6f82000)

 

The line for libcofi_rpi.so is missing from the ldd-inside, but the file (/usr/lib/arm-linux-gnueabihf/libcofi_rpi.so) is inside the jail!

 

When I look at strace output (strace running outside the jail watching jailed processes), I see that the execve of /bin/grep fails with ENOENT, but the file for /bin/grep is there.

 

Any ideas?

 

Thanks - Tzvi.

--

Tzvi Edelman cell:+972-50-849-8805  <address@hidden> H.323:tevid.no-ip.biz

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