[gentoo-amd64] Re: Unable to execute binary files on CLI

[Duncan]

"Tonko Mulder" <tonko.mulder@×××××.com> posted
43ba12950811130030h6405b74aia30fff4b38424383@××××××××××.com, excerpted
below, on  Thu, 13 Nov 2008 09:30:09 +0100:

> for some reason I'm unable to execute binary files and script files
> (e.g. bash/sh/python).
> If I put the interpreter in front of the shell script then I'm able to
> execute the file, but I'm unable to run it as one would normal run it.

Three possibilities (in addition to what Nadav already mentioned, user 
exec permissions and a missing or corrupted /usr/bin/env):

1:  Mount options.  At one point some years ago (back on Mandrake) I had /
tmp mounted noexec, forgot about it, and then had something (I actually 
wanted) try to run from there.  I was rather new to Linux at the time, 
and checked permissions and all sorts of stuff I thought /might/ be the 
problem, before I figured it out.  "Doh!" <said while smacking my 
forehead> "Of /course/ it can't execute, /tmp's mounted noexec!

So I don't know your file system volume layout, but if it's happening on 
only one mounted volume, that could be your problem.

2:  Kernel executable type options:

In menuconfig, under Executable file formats / Emulations, verify that 
IE32 Emulation is turned on (IA32_EMULATION=y in your .config, I noted 
that the file report you posted said ELF 32-bit, and this is of course an 
amd64 list so I'm assuming a 64-bit kernel and main system, you'll need 
that 32-bit kernel option enabled to run 32-bit code).

For certain types of executables you may need Kernel support for MISC 
binaries (BINFMT_MISC), located in the same submenu, turned on (and its 
pseudofs mounted) as well.  I don't have it turned on here and haven't 
run into problems, but read the associated help anyway, and if necessary, 
the other documentation it mentions.

3. If it's 32-bit you're looking at, perhaps your multilib config is 
messed up.  But since I don't do servitudeware (see the sig) and all the 
freedomware I run has been ported to amd64 for quite some time, I have no 
reason for multilib and thus run the 64-bit-only no-multilib profile, so 
I'll be of little help in that regard.

-- 
Duncan - List replies preferred.   No HTML msgs.
"Every nonfree program has a lord, a master --
and if you use the program, he is your master."  Richard Stallman