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Mon, 27 Apr 2026 08:35:35 -0700 (PDT) Date: Mon, 27 Apr 2026 17:34:18 +0200 In-Reply-To: <20260427153416.2103979-17-ardb+git@google.com> Mime-Version: 1.0 References: <20260427153416.2103979-17-ardb+git@google.com> X-Developer-Key: i=ardb@kernel.org; a=openpgp; fpr=F43D03328115A198C90016883D200E9CA6329909 X-Developer-Signature: v=1; a=openpgp-sha256; l=837; i=ardb@kernel.org; h=from:subject; bh=FjvXC4Bvv/morAQPM0ElYAlwegkzMza4j/YwiIL/yF4=; b=owGbwMvMwCVmkMcZplerG8N4Wi2JIfN94++NX3ll/ZiXVZap93TO00rsSY3MY/ndJRGotvX3m Y9v23Q6SlkYxLgYZMUUWQRm/3238/REqVrnWbIwc1iZQIYwcHEKwEQu/mX4xXRjUvDxfwUKzSeC Qp+sfOS5rfhfFteH21tOH9i1KfXn+g6G/9lLOeQeqzgJu68KXXDhuUvujolfrnt0PsxjVi7vjpH 14gcA X-Mailer: git-send-email 2.54.0.rc2.544.gc7ae2d5bb8-goog Message-ID: <20260427153416.2103979-18-ardb+git@google.com> Subject: [PATCH v4 01/15] 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 , linux-mm@kvack.org, linux-hardening@vger.kernel.org Content-Type: text/plain; charset="UTF-8" X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260427_083537_693326_16C79B5F X-CRM114-Status: GOOD ( 11.68 ) 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 __ro_after_init section, make sure it 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..f084993024ab 100644 --- a/arch/arm64/mm/mmu.c +++ b/arch/arm64/mm/mmu.c @@ -1049,7 +1049,7 @@ void __init mark_linear_text_alias_ro(void) */ update_mapping_prot(__pa_symbol(_text), (unsigned long)lm_alias(_text), (unsigned long)__init_begin - (unsigned long)_text, - PAGE_KERNEL_RO); + pgprot_tagged(PAGE_KERNEL_RO)); } #ifdef CONFIG_KFENCE -- 2.54.0.rc2.544.gc7ae2d5bb8-goog