Messages in this thread | | | Date | Tue, 20 Nov 2012 16:18:33 -0800 | Subject | Re: [PATCH v2] devtmpfs: mount with noexec and nosuid | From | Kees Cook <> |
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On Tue, Nov 20, 2012 at 4:13 PM, Kay Sievers <kay@vrfy.org> wrote: > On Tue, Nov 20, 2012 at 9:42 PM, Kees Cook <keescook@chromium.org> wrote: >> Since devtmpfs is writable, make the default noexec,nosuid as well. This >> protects from the case of a privileged process having an arbitrary file >> write flaw and an argumentless arbitrary execution (i.e. it would lack >> the ability to run "mount -o remount,exec,suid /dev"). > > This only really applies to systems without an initramfs when the > kernel mounts /dev over the rootfs it has mounted; with an initramfs, > /dev is always mounted by user code. > > Just checking, that is the use case you are doing that for?
Correct. We're using this in Chrome OS, which does not use an initramfs.
-Kees
-- Kees Cook Chrome OS Security
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