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Tue, 19 May 2026 08:18:16 -0700 (PDT) Date: Tue, 19 May 2026 17:16:18 +0200 In-Reply-To: <20260519151616.2557018-15-ardb+git@google.com> Mime-Version: 1.0 References: <20260519151616.2557018-15-ardb+git@google.com> X-Developer-Key: i=ardb@kernel.org; a=openpgp; fpr=F43D03328115A198C90016883D200E9CA6329909 X-Developer-Signature: v=1; a=openpgp-sha256; l=911; i=ardb@kernel.org; h=from:subject; bh=uYqf26ha3K7mBUMG5pQkMvA1333YXFAF+bz49QK3I9c=; b=owGbwMvMwCVmkMcZplerG8N4Wi2JIYun7nCKotCqPVHbJlU/P5+WPXNtRp6U1LQXbxdfmBE1Y 0raotU9HaUsDGJcDLJiiiwCs/++23l6olSt8yxZmDmsTCBDGLg4BWAiOm8YGdZPT5zjozhLrdzq W9rh4yk/1SbP27vU5sihNukc80LNiGCGf9ocz6d5P87N5VjR8+WxStrSZ0/T/5+7djo9/dI6ySM 2HzkB X-Mailer: git-send-email 2.54.0.563.g4f69b47b94-goog Message-ID: <20260519151616.2557018-16-ardb+git@google.com> Subject: [PATCH v5 01/13] arm64: mm: Map the linear alias of text/rodata as tagged From: Ard Biesheuvel To: linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org, will@kernel.org, catalin.marinas@arm.com, mark.rutland@arm.com, Ard Biesheuvel , Ryan Roberts , Anshuman Khandual , Liz Prucka , Seth Jenkins , Kees Cook , Mike Rapoport , David Hildenbrand , Andrew Morton , Jann Horn , linux-mm@kvack.org, linux-hardening@vger.kernel.org Content-Type: text/plain; charset="UTF-8" X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260519_081819_446410_997781A5 X-CRM114-Status: GOOD ( 12.84 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: Ard Biesheuvel Before moving the empty_zero_page into the .rodata section, make sure its linear alias has the memory-tagged type. This is needed to ensure that cpu_enable_mte() will be able to initialize the tags correctly. Signed-off-by: Ard Biesheuvel --- arch/arm64/mm/mmu.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c index dd85e093ffdb..0c3d97f120e1 100644 --- a/arch/arm64/mm/mmu.c +++ b/arch/arm64/mm/mmu.c @@ -1195,7 +1195,7 @@ static void __init map_mem(pgd_t *pgdp) * so we should avoid them here. */ __map_memblock(pgdp, kernel_start, kernel_end, - PAGE_KERNEL, NO_CONT_MAPPINGS); + pgprot_tagged(PAGE_KERNEL), NO_CONT_MAPPINGS); memblock_clear_nomap(kernel_start, kernel_end - kernel_start); arm64_kfence_map_pool(early_kfence_pool, pgdp); } -- 2.54.0.563.g4f69b47b94-goog