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SubjectRe: all files are executable in vfat


On Tue, 25 Sep 2001, Nerijus Baliunas wrote:

> On Tue, 25 Sep 2001 12:09:30 -0400 (EDT) Alexander Viro <viro@math.psu.edu> wrote:
>
> AV> > All files are executable in vfat (kernel 2.4.10), although I have
> AV> > /dev/hda1 /mnt/c vfat defaults,user,noexec,umask=0,quiet 0 0
> AV> > in /etc/fstab. They were not in 2.4.7.
> AV>
> AV> Really? Try to execute a binary from there. cp /bin/ls /mnt/c && /mnt/c/ls
>
> bash: /mnt/c/ls: Permission denied. But:
> $ ls -l ls
> -rwxrwxrwx 1 nerijus nerijus 45724 Rgs 25 18:12 ls

So use the right option for that - umask=111 and there you go.

noexec doesn't (and shouldn't) do anything about mode. Yes, VFAT (along
with explicit mechanism for doing what you want to do) used to have a
bug in noexec handling. And that's a bug - plain and simple. Try it
on any other UNIX _or_ other filesystem on Linux.

-o noexec means "execve() fails regardless of file permissions". If you
want "give all regular files rw-rw-rw-" - VFAT has option for that:
umask.

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