Messages in this thread | | | From | Dan Williams <> | Date | Wed, 17 Jan 2018 11:54:12 -0800 | Subject | Re: [PATCH v3 8/9] x86: use __uaccess_begin_nospec and ASM_IFENCE in get_user paths |
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On Wed, Jan 17, 2018 at 10:52 AM, Al Viro <viro@zeniv.linux.org.uk> wrote: > On Wed, Jan 17, 2018 at 02:17:26PM +0000, Alan Cox wrote: [..] > Incidentally, what about copy_to_iter() and friends? They > check iov_iter flavour and go either into the "copy to kernel buffer" > or "copy to userland" paths. Do we need to deal with mispredictions > there? We are calling a bunch of those on read()... >
Those should be protected by the conversion of __uaccess_begin to __uaccess_begin_nospec that includes the lfence.
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