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Date: Mon, 9 May 2022 20:37:42 -0700 From: Andrew Morton <akpm@...ux-foundation.org> To: "Matthew Wilcox (Oracle)" <willy@...radead.org> Cc: Kees Cook <keescook@...omium.org>, linux-mm@...ck.org, linux-hardening@...r.kernel.org Subject: Re: [PATCH 1/4] mm/usercopy: Check kmap addresses properly On Mon, 10 Jan 2022 23:15:27 +0000 "Matthew Wilcox (Oracle)" <willy@...radead.org> wrote: > If you are copying to an address in the kmap region, you may not copy > across a page boundary, In the source, the destination or in both, and why may we not? > no matter what the size of the underlying > allocation. You can't kmap() a slab page because slab pages always > come from low memory. Why not? kmap() does if (!PageHighMem(page)) addr = page_address(page); else addr = kmap_high(page);
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