Re: rm-ing files with open file descriptors

From: Herbert Xu (herbert@gondor.apana.org.au)
Date: Thu Jan 24 2002 - 04:46:29 EST


Pavel Machek <pavel@suse.cz> wrote:

>> How is linking back a file into the normal namespace anymore
>> a security hole as having it under /proc or keeping an fd to it
>> open?

> Imagine you want to delete my file, you are root.

> Before, you could rm it, then kill all my processes.

No you can't. Your processes may be in a tight loop making new links
for the file. The only safe solution is to kill the processes first,
then delete the file.

-- 
Debian GNU/Linux 2.2 is out! ( http://www.debian.org/ )
Email:  Herbert Xu ~{PmV>HI~} <herbert@gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/



This archive was generated by hypermail 2b29 : Thu Jan 31 2002 - 21:00:19 EST