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Message-ID: <20140401112930.465e3300@hananiah.suse.cz> Date: Tue, 1 Apr 2014 11:29:30 +0200 From: Petr Tesarik <ptesarik@...e.cz> To: Greg Kroah-Hartman <gregkh@...uxfoundation.org> Cc: Arnd Bergmann <arnd@...db.de>, linux-kernel@...r.kernel.org Subject: Re: [PATCH] /dev/mem: handle out-of-bounds read/write On Thu, 30 Jan 2014 07:04:07 -0800 Greg Kroah-Hartman <gregkh@...uxfoundation.org> wrote: > On Thu, Jan 30, 2014 at 03:03:32PM +0100, Petr Tesarik wrote: > > On Thu, 30 Jan 2014 05:28:27 -0800 > > Greg Kroah-Hartman <gregkh@...uxfoundation.org> wrote: > > > > > On Thu, Jan 30, 2014 at 09:48:02AM +0100, Petr Tesarik wrote: > > > > The loff_t type may be wider than phys_addr_t (e.g. on 32-bit systems). > > > > Consequently, the file offset may be truncated in the assignment. > > > > Currently, /dev/mem wraps around, which may cause applications to read > > > > or write incorrect regions of memory by accident. > > > > > > Does that really happen? If so, that's a userspace bug, right? > > > > In my case, it was a userspace bug, indeed. But debugging would have > > been much easier if I saw read() fail with an EOF condition, rather > > than pretend that it actually read some bytes (from above 4G) on a > > 32-bit box. > > Thats true. > > Ok, I'll queue this up after 3.14-rc1 is out, thanks. Hi Greg, what happened to this patch? I still don't see it in git... Petr T -- 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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