[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

bug#23853: chmod can unset sticky bits using octet format

From: Eric Blake
Subject: bug#23853: chmod can unset sticky bits using octet format
Date: Mon, 27 Jun 2016 08:13:20 -0600
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.3.0

On 06/26/2016 06:56 PM, westlake wrote:
> According to chmod's manpage,
> "chmod preserves a directory's set-user-ID and set-group-ID bits unless
> you explicitly specify otherwise.  You can set or clear the bits with
> symbolic modes like u+s and g-s, and you can set (but not clear) the
> bits with a numeric mode."
> contrary to documentation, chmod can otherwise clear sticky bits using
> the octet notation but by using a 5th octal
> commands used,
> mkdir abc
> chmod u+s,g+s abc
> chmod 0755 abc (no effect on the sticky bits)
> chmod 00755 abc (sticky bits cleared using the 5th octal position)

The behavior of the 5th octal to intentionally specify that the
otherwise leading 0 is intended to clear sticky bits is intentional, so
the only bug here is in the documentation for not making the intended
behavior more obvious.

Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

Attachment: signature.asc
Description: OpenPGP digital signature

reply via email to

[Prev in Thread] Current Thread [Next in Thread]