Messages in this thread | ![/](/images/icornerl.gif) | | Date | Wed, 10 May 2017 01:14:31 -0700 | From | Christoph Hellwig <> | Subject | Re: [kernel-hardening] Re: [PATCH v9 1/4] syscalls: Verify address limit before returning to user-mode |
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On Wed, May 10, 2017 at 09:08:41AM +0100, Al Viro wrote: > On Wed, May 10, 2017 at 09:37:04AM +0200, Arnd Bergmann wrote: > > > > How about trying to remove all of them? If we could actually get rid > > > of all of them, we could drop the arch support, and we'd get faster, > > > simpler, shorter uaccess code throughout the kernel. > > BTW, not all get_user() under KERNEL_DS are plain loads. There is an > exception - probe_kernel_read().
And various calls that looks like opencoded versions, e.g. drivers/dio or the ELF loader.
But in the long run we'll just need a separate primitive for that, but that can wait until the set_fs calls outside the core code are gone.
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