From: Mark Rutland Date: Wed, 13 Dec 2017 11:45:42 +0000 (+0000) Subject: arm64: fix CONFIG_DEBUG_WX address reporting X-Git-Tag: v5.15~9796^2~2 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=1d08a044cf12aee37dfd54837558e3295287b343;p=platform%2Fkernel%2Flinux-starfive.git arm64: fix CONFIG_DEBUG_WX address reporting In ptdump_check_wx(), we pass walk_pgd() a start address of 0 (rather than VA_START) for the init_mm. This means that any reported W&X addresses are offset by VA_START, which is clearly wrong and can make them appear like userspace addresses. Fix this by telling the ptdump code that we're walking init_mm starting at VA_START. We don't need to update the addr_markers, since these are still valid bounds regardless. Cc: Fixes: 1404d6f13e47 ("arm64: dump: Add checking for writable and exectuable pages") Signed-off-by: Mark Rutland Cc: Kees Cook Cc: Laura Abbott Reported-by: Timur Tabi Signed-off-by: Will Deacon --- diff --git a/arch/arm64/mm/dump.c b/arch/arm64/mm/dump.c index ca74a2a..7b60d62 100644 --- a/arch/arm64/mm/dump.c +++ b/arch/arm64/mm/dump.c @@ -389,7 +389,7 @@ void ptdump_check_wx(void) .check_wx = true, }; - walk_pgd(&st, &init_mm, 0); + walk_pgd(&st, &init_mm, VA_START); note_page(&st, 0, 0, 0); if (st.wx_pages || st.uxn_pages) pr_warn("Checked W+X mappings: FAILED, %lu W+X pages found, %lu non-UXN pages found\n",