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Open Source and information security mailing list archives
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Date: Thu, 16 Feb 2012 21:48:38 -0500 From: David Windsor <dwindsor@...il.com> To: Kees Cook <keescook@...omium.org>, Greg KH <gregkh@...uxfoundation.org>, pageexec@...email.hu, Ubuntu security discussion <ubuntu-hardened@...ts.ubuntu.com>, spender@...ecurity.net, linux-kernel@...r.kernel.org, kernel-hardening@...ts.openwall.com Subject: Re: [ubuntu-hardened] Add overflow protection to kref <snip> >> >> I have yet to see a patch, so why are we arguing about this? :) >> >> Again, I don't know of any kref overflows that have ever happened, so >> trying to "protect" this type of thing, seems odd to me. > > Well, I think the issue was to protect counting things (which seems to > be what PaX was after originally), and that kref seemed like the place > to put it. I'll let David take it further. > Patches are forthcoming that will first introduce overflow protection to kref. Once that's in place, I'll move a few refcount users from atomic_t to kref as a reference for other subsystems; statistics-based users (and others not requiring overflow protection) can continue using atomic_t. As Kees said, we just wanted to introduce the idea and get some general feedback before beginning. Thanks. > Thanks, > > -Kees > > -- > Kees Cook > ChromeOS Security -- PGP: 6141 5FFD 11AE 9844 153E F268 7C98 7268 6B19 6CC9 -- 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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