linux-kernel - Re: [patch 07/10] unprivileged mounts: add sysctl tunable for "safe" property

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Message-ID: <20080207140521.GC4058@sergelap.austin.ibm.com>
Date:	Thu, 7 Feb 2008 08:05:21 -0600
From:	"Serge E. Hallyn" <serue@...ibm.com>
To:	Miklos Szeredi <miklos@...redi.hu>
Cc:	serue@...ibm.com, akpm@...ux-foundation.org, hch@...radead.org,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [patch 07/10] unprivileged mounts: add sysctl tunable for
	"safe" property

Quoting Miklos Szeredi (miklos@...redi.hu):
> > > Maybe sysctls just need to check capabilities, instead of uids.  I
> > > think that would make a lot of sense anyway.
> > 
> > Would it be as simple as tagging the inodes with capability sets?  One
> > set for writing, or one each for reading and writing?
> 
> Yes, or something even simpler, like mapping the owner permission bits
> to CAP_SYS_ADMIN.  There seem to be very few different permissions
> under /proc/sys:
> 
> --w-------
> -r--r--r--
> -rw-------
> -rw-r--r--
> 
> As long as the group and other bits are always the same, and we accept
> that the owner bits really mean CAP_SYS_ADMIN and not something else,

But I would assume some things under /proc/sys/net/ipv4 or
/proc/sys/net/ath0 require CAP_NET_ADMIN rather than CAP_SYS_ADMIN?

> then the permission check would not need to look at uids or gids at
> all.
> 
> Miklos
> -
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