From patchwork Wed Aug 28 23:27:28 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Brown X-Patchwork-Id: 13782135 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A9AF01AE04A; Wed, 28 Aug 2024 23:29:58 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724887798; cv=none; b=UJSQOUG4DQjhVlB3Tx5XPx4fw70FecDT4URrbGC3CmNw7YOecMfZ3juKnuy2AWMvyZ2E0mWbCNgy7s/tHKeGvJ1As2yMrX/EdrMOFerf4AY4kYpYGcVS9d+oHsQoxp3N75/UpGR5Et0OJI689P14ymAJQ1d0X7m2JKSFm1zMOWA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724887798; c=relaxed/simple; bh=HBIymMJlJf7+ITwOhb+j59rN4WPQGeznsoeJKujezak=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=jOhGEt/7tQpOacXr/zx7qmO+kWS7qyQkBrUog1shcsBUTneOjau0XYcZHXrih3DWyWIiHG1DCgUUQIT6SevtBalx9wJ/UnqLc4YoNZlMABl8zvYTC8ue0PesRsuKICTi1NDAqzRojihgfTA7E22lk+nmJxLGE6XbpMCrN7VO6HM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=XuchLGfp; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="XuchLGfp" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D4708C4CEC4; Wed, 28 Aug 2024 23:29:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1724887798; bh=HBIymMJlJf7+ITwOhb+j59rN4WPQGeznsoeJKujezak=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=XuchLGfpg5OGC29+xUs4tplER41FbxWeXpPKVwAao9yigT9A0vzLu7atvegblnWF+ l9n0lbSiCOwQOVqWPFmMwZ1ekCxohBLhxIZlTDfvhlHMYoLVZI08jkKtMiKzUjmCyJ HXaPWb7Ph7Xw++l04ZvMGyciJbqPUY2k+kTF27pDfK8ghBeiw7eTIvye3AUkkz1u78 6n0WaZY6WuAU6cMUUkD6py5x0AXdt7mK/+Q5nxwlcrX9FL1hWh3+RdOSLrmFC/Z+iA VwV99HdP/CYpHb+hNifkAqUX+HWxIPzuli175SpswLow1sDMGQsJ6xewd1Eilts376 aMj66DaER4Yng== From: Mark Brown Date: Thu, 29 Aug 2024 00:27:28 +0100 Subject: [PATCH v12 12/39] arm64/mm: Allocate PIE slots for EL0 guarded control stack Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240829-arm64-gcs-v12-12-42fec947436a@kernel.org> References: <20240829-arm64-gcs-v12-0-42fec947436a@kernel.org> In-Reply-To: <20240829-arm64-gcs-v12-0-42fec947436a@kernel.org> To: Catalin Marinas , Will Deacon , Jonathan Corbet , Andrew Morton , Marc Zyngier , Oliver Upton , James Morse , Suzuki K Poulose , Arnd Bergmann , Oleg Nesterov , Eric Biederman , Shuah Khan , "Rick P. Edgecombe" , Deepak Gupta , Ard Biesheuvel , Szabolcs Nagy , Kees Cook Cc: "H.J. Lu" , Paul Walmsley , Palmer Dabbelt , Albert Ou , Florian Weimer , Christian Brauner , Thiago Jung Bauermann , Ross Burton , Yury Khrustalev , Wilco Dijkstra , linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org, kvmarm@lists.linux.dev, linux-fsdevel@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org, Mark Brown X-Mailer: b4 0.15-dev-37811 X-Developer-Signature: v=1; a=openpgp-sha256; l=3084; i=broonie@kernel.org; h=from:subject:message-id; bh=HBIymMJlJf7+ITwOhb+j59rN4WPQGeznsoeJKujezak=; b=owEBbQGS/pANAwAKASTWi3JdVIfQAcsmYgBmz7KBw7IkueYw48dG/sRyNikrfDrnQy9nMXT3KbWR xXEWMBqJATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCZs+ygQAKCRAk1otyXVSH0CGzB/ 9FpI/8Nvj4l3e3y0PhdlgWD6cJmpnUTWZm24RKsU3fbtVsmMEvF3ODMODz0uFDiL1/lUe63cWHGkvx Hayy3os5dp5kOAHOGPUEn/4XN2M79ssNHm7FbaM6+IVxsHoWOQm6JNyQi2nae5oZkjwAdhs/mJ4JvI 1cVV/RtvTwu7irvFTTH7T2lXgJsyo5nQ9CkkSoetnG0WX5MeiT5WseOUdX/Nw71e5CWMAt3FZ3WVpw kULf7K2sNZigyVBgAFwDqXzzJF4vlIWRJTVbnBJ2yT0BSWPHSX1nKyIQ0rCEvUO4Nycaw8vzShgwMY eBO4adf8kEYYhFUkeNbsu+9vEwVFE3 X-Developer-Key: i=broonie@kernel.org; a=openpgp; fpr=3F2568AAC26998F9E813A1C5C3F436CA30F5D8EB Pages used for guarded control stacks need to be described to the hardware using the Permission Indirection Extension, GCS is not supported without PIE. In order to support copy on write for guarded stacks we allocate two values, one for active GCSs and one for GCS pages marked as read only prior to copy. Since the actual effect is defined using PIE the specific bit pattern used does not matter to the hardware but we choose two values which differ only in PTE_WRITE in order to help share code with non-PIE cases. Reviewed-by: Thiago Jung Bauermann Reviewed-by: Catalin Marinas Signed-off-by: Mark Brown --- arch/arm64/include/asm/pgtable-prot.h | 14 ++++++++++++-- 1 file changed, 12 insertions(+), 2 deletions(-) diff --git a/arch/arm64/include/asm/pgtable-prot.h b/arch/arm64/include/asm/pgtable-prot.h index b11cfb9fdd37..545d54c88520 100644 --- a/arch/arm64/include/asm/pgtable-prot.h +++ b/arch/arm64/include/asm/pgtable-prot.h @@ -144,15 +144,23 @@ static inline bool __pure lpa2_is_enabled(void) /* 6: PTE_PXN | PTE_WRITE */ /* 7: PAGE_SHARED_EXEC PTE_PXN | PTE_WRITE | PTE_USER */ /* 8: PAGE_KERNEL_ROX PTE_UXN */ -/* 9: PTE_UXN | PTE_USER */ +/* 9: PAGE_GCS_RO PTE_UXN | PTE_USER */ /* a: PAGE_KERNEL_EXEC PTE_UXN | PTE_WRITE */ -/* b: PTE_UXN | PTE_WRITE | PTE_USER */ +/* b: PAGE_GCS PTE_UXN | PTE_WRITE | PTE_USER */ /* c: PAGE_KERNEL_RO PTE_UXN | PTE_PXN */ /* d: PAGE_READONLY PTE_UXN | PTE_PXN | PTE_USER */ /* e: PAGE_KERNEL PTE_UXN | PTE_PXN | PTE_WRITE */ /* f: PAGE_SHARED PTE_UXN | PTE_PXN | PTE_WRITE | PTE_USER */ +#define _PAGE_GCS (_PAGE_DEFAULT | PTE_NG | PTE_UXN | PTE_WRITE | PTE_USER) +#define _PAGE_GCS_RO (_PAGE_DEFAULT | PTE_NG | PTE_UXN | PTE_USER) + +#define PAGE_GCS __pgprot(_PAGE_GCS) +#define PAGE_GCS_RO __pgprot(_PAGE_GCS_RO) + #define PIE_E0 ( \ + PIRx_ELx_PERM(pte_pi_index(_PAGE_GCS), PIE_GCS) | \ + PIRx_ELx_PERM(pte_pi_index(_PAGE_GCS_RO), PIE_R) | \ PIRx_ELx_PERM(pte_pi_index(_PAGE_EXECONLY), PIE_X_O) | \ PIRx_ELx_PERM(pte_pi_index(_PAGE_READONLY_EXEC), PIE_RX) | \ PIRx_ELx_PERM(pte_pi_index(_PAGE_SHARED_EXEC), PIE_RWX) | \ @@ -160,6 +168,8 @@ static inline bool __pure lpa2_is_enabled(void) PIRx_ELx_PERM(pte_pi_index(_PAGE_SHARED), PIE_RW)) #define PIE_E1 ( \ + PIRx_ELx_PERM(pte_pi_index(_PAGE_GCS), PIE_NONE_O) | \ + PIRx_ELx_PERM(pte_pi_index(_PAGE_GCS_RO), PIE_NONE_O) | \ PIRx_ELx_PERM(pte_pi_index(_PAGE_EXECONLY), PIE_NONE_O) | \ PIRx_ELx_PERM(pte_pi_index(_PAGE_READONLY_EXEC), PIE_R) | \ PIRx_ELx_PERM(pte_pi_index(_PAGE_SHARED_EXEC), PIE_RW) | \