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Message-Id: <388693f52ba168b93a2ee29dc0a52895b872dbb4.1455198893.git.jslaby@suse.cz> Date: Thu, 11 Feb 2016 14:59:24 +0100 From: Jiri Slaby <jslaby@...e.cz> To: stable@...r.kernel.org Cc: linux-kernel@...r.kernel.org, Will Deacon <will.deacon@....com>, Greg Kroah-Hartman <gregkh@...uxfoundation.org> Subject: [PATCH 3.12 48/64] arm64: mm: ensure that the zero page is visible to the page table walker From: Will Deacon <will.deacon@....com> 3.12-stable review patch. If anyone has any objections, please let me know. =============== commit 32d6397805d00573ce1fa55f408ce2bca15b0ad3 upstream. In paging_init, we allocate the zero page, memset it to zero and then point TTBR0 to it in order to avoid speculative fetches through the identity mapping. In order to guarantee that the freshly zeroed page is indeed visible to the page table walker, we need to execute a dsb instruction prior to writing the TTBR. Signed-off-by: Will Deacon <will.deacon@....com> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> --- arch/arm64/mm/mmu.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c index f8dc7e8fce6f..84ddb372fbc6 100644 --- a/arch/arm64/mm/mmu.c +++ b/arch/arm64/mm/mmu.c @@ -374,6 +374,9 @@ void __init paging_init(void) empty_zero_page = virt_to_page(zero_page); + /* Ensure the zero page is visible to the page table walker */ + dsb(); + /* * TTBR0 is only used for the identity mapping at this stage. Make it * point to zero page to avoid speculatively fetching new entries. -- 2.7.1
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