On Mon, Dec 13, 2021 at 12:52:22PM -0800, Kees Cook wrote: > On Mon, Dec 13, 2021 at 02:27:03PM +0000, Matthew Wilcox (Oracle) wrote: > > Move the compound page overrun detection out of > > CONFIG_HARDENED_USERCOPY_PAGESPAN so it's enabled for more people. > > I'd argue that everything else enabled by USERCOPY_PAGESPAN could be > removed now too. Do you want to add a 4th patch to rip that out? > > https://github.com/KSPP/linux/issues/163 I don't mind ... is it your assessment that it's not worth checking for a copy_to/from_user that spans a boundary between a reserved and !reserved page, or overlaps the boundary of rodata/bss/data/CMA? I have no basis on which to judge that, so it's really up to you.
