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Peter Anvin" , virtualization@lists.linux.dev, bcm-kernel-feedback-list@broadcom.com, linux-kernel@vger.kernel.org, Christoph Lameter , Andrew Morton , Bo Gan , linux-mm@kvack.org, linux-arch@vger.kernel.org, linux-coco@lists.linux.dev, kvm@vger.kernel.org, Jonathan Corbet , "K. Y. Srinivasan" , Haiyang Zhang , Long Li , Andy Lutomirski , Peter Zijlstra , linux-doc@vger.kernel.org, linux-hyperv@vger.kernel.org, Nathan Chancellor , Kees Cook , Ashish Kalra Subject: [PATCH v2 1/6] percpu: Page-align decrypted data in UP kernels Date: Tue, 29 Sep 2026 00:02:50 -0400 Message-ID: <20260929040256.543767-2-zack.rusin@broadcom.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260929040256.543767-1-zack.rusin@broadcom.com> References: <20260929040256.543767-1-zack.rusin@broadcom.com> Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-DetectorID-Processed: b00c1d49-9d2e-4205-b15f-d015386d3d5e Without SMP, DEFINE_PER_CPU_DECRYPTED() places variables in .data..decrypted. Align both ends of that section so that changing a variable's encryption attribute cannot expose unrelated kernel data. Keep the section in permanent data, where UP variables are instantiated. Fixes: 000f8870a47b ("vmlinux.lds.h: Fix placement of '.data..decrypted' section") Signed-off-by: Zack Rusin --- include/asm-generic/vmlinux.lds.h | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h index b2988aa12f66..64bc2bfdd2ec 100644 --- a/include/asm-generic/vmlinux.lds.h +++ b/include/asm-generic/vmlinux.lds.h @@ -368,10 +368,19 @@ /* * .data section */ +#if defined(CONFIG_AMD_MEM_ENCRYPT) && !defined(CONFIG_SMP) +#define DATA_DECRYPTED \ + . = ALIGN(PAGE_SIZE); \ + *(.data..decrypted) \ + . = ALIGN(PAGE_SIZE); +#else +#define DATA_DECRYPTED *(.data..decrypted) +#endif + #define DATA_DATA \ *(.xiptext) \ *(DATA_MAIN) \ - *(.data..decrypted) \ + DATA_DECRYPTED \ *(.ref.data) \ *(.data..shared_aligned) /* percpu related */ \ *(.data..unlikely) \ -- 2.53.0