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Message-ID: <20151007161228.GD9669@kroah.com> Date: Wed, 7 Oct 2015 17:12:28 +0100 From: Greg KH <gregkh@...uxfoundation.org> To: Srinivas Kandagatla <srinivas.kandagatla@...aro.org> Cc: maxime.ripard@...e-electrons.com, linux-kernel@...r.kernel.org, andrew@...n.ch, wxt@...k-chips.com, stefan.wahren@...e.com, pantelis.antoniou@...sulko.com, maitysanchayan@...il.com, p.zabel@...gutronix.de, s.hauer@...gutronix.de, linux-arm-kernel@...ts.infradead.org Subject: Re: [PATCH v2 1/3] nvmem: core: make default user binary file root-access only On Wed, Oct 07, 2015 at 02:18:47PM +0100, Srinivas Kandagatla wrote: > > > On 07/10/15 13:55, Greg KH wrote: > >On Wed, Oct 07, 2015 at 12:00:47PM +0100, Srinivas Kandagatla wrote: > >>As required by many providers like at24/at25/mxs-ocotp/qfprom and may be > >>other providers would want to allow root-only to read the nvmem content. > >>So making the defaults to be root-only access would address the request > >>and also provide flexibility to providers to specify there own permissions > >>on top of the root-only using the perm flag in nvmem_config. > > > >Eeek, no, don't mess with different permissions, that's not ok, be > >consistent and only allow root write access, that's why we have static > >build-time checks to ensure you get this correct and do not accidentally > >let a "normal" user access to things they shouldn't have access to. > Thanks for your inputs, > > Code as it is in mainline would provide a write permission to root-only and > read to all the group. > > Fixing/removing the group read permissions should stop normal user accessing > the binary file. Great, send a simple patch that does this and I'll be glad to queue it up. thanks, greg k-h -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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