Fail to execute a binary file from a CD...

[Andy]

On 16/02/07, Patrick Gelin <patrick.gelin at free.fr> wrote:
> gelinp at gelinp-desktop:/media/cdrom0$ sudo ./installUnix
> sudo: unable to execute ./installUnix: Permission denied
>
> What is the problem?

CDs have user as an option in /etc/fstab.
user adds the options noexec, nosuid, and nodev for security.
You wouldn't want a user being ables to save an SUID binary on a
machine they had root access to and then running it on a PC they
didn't to elevate privileges. Similar reasoning applies to the nodev.

If you trust every user you could edit /etc/fstab to allow execution.
(add ,exec after noauto) NOT recommended, for security reasons.

Or you can mount the CD as root with different options.
try: umount /media/cdrom0
mount /dev/hdc  /media/cdrom0 -t udf,iso9660 -o exec,umask=0222,nosuid,nodev
not 100% sure that command is right btw. replace /dev/hdc with
whatever device is your CD drive.
replace /media/cdrom0 with wherever your CD is mounted
(the umask allows all users to read and execute, if you don't want
that then omit that bit but you will need to run the file from the CD
as root, which is a bad idea).

Or you could just copy the file, and everything else it needs to a
directory on your hard drive and chmod u+x filename
(a problem if its looking for files on the CD, but safer).

If you are the only user on the machine then you might not need to be
so concerned about all users being able to execute stuff for option 2.

Hope that helps

Andy