Re: symlinks with permissions

[Nick Bowler]

On 19:35 Fri 30 Oct     , Pavel Machek wrote:
> > How many linux shell scripts and other applications that use /dev/fd/N
> > or /proc/self/fd/N will you be breaking?
> 
> Zero. (Well unless someone is exploiting it in wild).

I've definitely written at least one script before that does something
along the lines of 'echo foo > /dev/fd/N'.  It's not one that I remember
anything else about, so perhaps its behaviour would be unaffected by
forbidding this if the particular file descriptor did not originally
have read-write permissions.  I have a hard time believing that amongst
millions of users, not one of them has a script that would be affected.

Frankly, I don't understand what is particularly surprising about the
fact that people can write to files with world write permissions.

-- 
Nick Bowler, Elliptic Technologies (http://www.elliptictech.com/)

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/