LinuxQuestions.org - no exec permission on my data partition

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no exec permission on my data partition

I've got a dedicated partition for all my data (music, films, etc). There's also
a directory with my scripts there. Whenever I learn bash or python I put those scripts to this partition. It is mounted in the following way:

Code:

/dev/sda10 /home/sycamorex/data ext3 auto,rw,exec,user 0 0

The problem is that I can't execute any script stored on that partition.
I always get the 'permission denied' error. I even granted a+x permissions on the script directories and files, but still without any success.

Code:

-rwxrwxrwx 1 sycamorex sycamorex 418 2008-09-03 23:59 ftp_file.py

If I copy them to my home directory everything is fine, so I assume it must be some issue with mounting it, isn't it?

SE Linux context maybe (check syslog/auditd.log)?

Thanks for your reply. Selinux is in the permissive mode, so it shouldn't be in the way. I've checked all the logs in /var/log
and there was no mention of anything that could be related to it:(
It applies both to debian and fedora. Perhaps it's just a security feature built in the kernel? But then, what would be the fstab 'exec' option for?

Quote:

Originally Posted by sycamorex (Post 3336268)

It applies both to debian and fedora. Perhaps it's just a security feature built in the kernel? But then, what would be the fstab 'exec' option for?

I doubt it's some security feature but hey, what do I know?.. Give us a strace of something simple?

thanks for the reply. I got it. While I was preparing the strace output, it dawned on me.
Although I have got appropriate shebangs in the scripts, in order to execute scripts from the data partition I need to specify the correct interpreter:
python ./script.py
bash ./script
Why is that? I can live with it, but is it possible to resolve it?

Hmm. Needing to use "./" ("here") is typical for $PATH issues but it doesn't explain the permission problem. At least not to me :-]

Actually, I don't need to use './' (sorry, I didn't check it:)), however I need to specify the interpreter:

Code:

xtd8865@debtop:~/data$ ./my_script

bash: ./my_script: /bin/bash: bad interpreter: Permission denied

xtd8865@debtop:~/data$ bash my_script

hello world!

xtd8865@debtop:~/data$ ./my_script.py

bash: ./my_script.py: /usr/bin/env: bad interpreter: Permission denied

xtd8865@debtop:~/data$ python my_script.py

hello world

Code:

xtd8865@debtop:~/data$ cat my_script

#!/bin/bash

echo 'hello world!'

exit 0

xtd8865@debtop:~/data$ cat my_script.py

#!/usr/bin/env python

print 'hello world'

Code:

xtd8865@debtop:~/data$ strace ./my_script

execve("./my_script", ["./my_script"], [/* 33 vars */]) = -1 EACCES (Permission denied)

dup(2)                                  = 3

fcntl64(3, F_GETFL)                    = 0x2 (flags O_RDWR)

fstat64(3, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 4), ...}) = 0

mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7f99000

_llseek(3, 0, 0xbfdb70ac, SEEK_CUR)    = -1 ESPIPE (Illegal seek)

write(3, "strace: exec: Permission denied\n"..., 32strace: exec: Permission denied

) = 32

close(3)                                = 0

munmap(0xb7f99000, 4096)                = 0

exit_group(1)                          = ?

Code:

xtd8865@debtop:~/data$ strace ./my_script.py 

execve("./my_script.py", ["./my_script.py"], [/* 33 vars */]) = -1 EACCES (Permission denied)

dup(2)                                  = 3

fcntl64(3, F_GETFL)                    = 0x2 (flags O_RDWR)

fstat64(3, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 4), ...}) = 0

mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7fc3000

_llseek(3, 0, 0xbfce0fcc, SEEK_CUR)    = -1 ESPIPE (Illegal seek)

write(3, "strace: exec: Permission denied\n"..., 32strace: exec: Permission denied

) = 32

close(3)                                = 0

munmap(0xb7fc3000, 4096)                = 0

exit_group(1)                          = ?

thanks

Nope. Doesn't ring a bell. Must be a fix so simple my mind refused to cache it. Sorry.

Quote:

Originally Posted by unSpawn (Post 3337744)

Nope. Doesn't ring a bell. Must be a fix so simple my mind refused to cache it. Sorry.

Probably, it is something simple:)
Can anyone try to execute a simple script from another partition?

thanks

What permissions do you have set for the directory you're mounting on? I have no problems running scripts from my "/data" disk.

Me neither. The perms are in the OP.

Quote:

Originally Posted by unSpawn (Post 3338034)

Me neither. The perms are in the OP.

Well, this is something I've never checked, so pardon my naivete. If you create a directory as read only and mount to it as RWX, does it still wind up as read only or are the permissions expanded by the mount?

Quote:

Originally Posted by Quakeboy02 (Post 3338431)

Mount trumps directory perms AFAIK.

Quote:

Originally Posted by unSpawn (Post 3338716)

Mount trumps directory perms AFAIK.

That'll teach me to RTFMP. :) I usually use "defaults" for column 4 which is:

defaults Uses the default options that are rw, suid, dev, exec, auto, nouser, and async.

From: http://www.tuxfiles.org/linuxhelp/fstab.html

Sorry for diverting the thread.

I remounted /data with 'defaults' as the only option in column 4 and it works like charm. Why on earth didn't I use 'defaults'
in the first place?

thanks