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Mon, 9 Aug 2021 16:30:44 +0000 From: Ross Philipson To: linux-kernel@vger.kernel.org, x86@kernel.org, iommu@lists.linux-foundation.org, linux-integrity@vger.kernel.org, linux-doc@vger.kernel.org Cc: ross.philipson@oracle.com, dpsmith@apertussolutions.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, hpa@zytor.com, luto@amacapital.net, kanth.ghatraju@oracle.com, trenchboot-devel@googlegroups.com Subject: [PATCH v3 03/14] x86/boot: Place kernel_info at a fixed offset Date: Mon, 9 Aug 2021 12:38:45 -0400 Message-Id: <1628527136-2478-4-git-send-email-ross.philipson@oracle.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1628527136-2478-1-git-send-email-ross.philipson@oracle.com> References: <1628527136-2478-1-git-send-email-ross.philipson@oracle.com> Content-Type: text/plain X-ClientProxiedBy: SA9PR10CA0021.namprd10.prod.outlook.com (2603:10b6:806:a7::26) To BY5PR10MB3793.namprd10.prod.outlook.com (2603:10b6:a03:1f6::14) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from lateralus.us.oracle.com (209.17.40.43) by SA9PR10CA0021.namprd10.prod.outlook.com (2603:10b6:806:a7::26) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4394.15 via Frontend Transport; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?7dfHzeWDg4FYtE7MlzPk6TPimfp4CNOSTYxFJr+XRnoi08Whn83NxiIQIvPz?= =?us-ascii?Q?YilcQz/PgSqHIUyDUUC0PUdMOQyorFN1bjsxxSHAbUP1PXxAMspV1VE/S5rp?= =?us-ascii?Q?HThSE+ln6IOLP9Za3Uok/WUzhNr14kX879rsLS8B5EYjpZ5RZHUJ5ngz2dm1?= =?us-ascii?Q?xq659xJFhBSZf04TXCZktdAN2hPTKmonE0oxfg0vtwdAWlhdBfJ04r0HLdTu?= =?us-ascii?Q?cjvavwAZWn4PnT1P13EYQnwNTV0CQvHUs8aUwxmZbP4utmdoHs1BmCwZsTZ7?= =?us-ascii?Q?RnB+qnfBIlzYfzbjpeEE/jxQnA4rs97kqT8TYlZT2S3VdJHDour82Q4XMgNa?= =?us-ascii?Q?Pkhy8TY/Nsxy1D+cUgHx+elsTr9oXznui7YHxooHEVYdFSITx0MC1pQgylcX?= =?us-ascii?Q?7ea4Lo0TRwafmN8C5ifaGcJ07bcT1BA14DFMR2nHUD5t1zKgMmMrP1n+lmEx?= =?us-ascii?Q?i+fZA8siqdFLP8f7H8lhm7M4A3lq01eJxAd4GEeOUydfoCChQyv1lBqbrz6Z?= =?us-ascii?Q?Q5H1j4TUlndUTGmdrTSK+Qf5fHrK64EmB9mvhlvha2JWSnfkn/I/VDFkZV23?= =?us-ascii?Q?rs7JvbhM4zlbHdKWyMabDND2/nFQiXejEDk9Nd/5gowk3Ie5eO1RyM3hyIwz?= =?us-ascii?Q?kianibfHxaqMGXMSXxguMiH2658Rhl9Arlx4pJq8ZdwmwBoKUurlIxDgtHKx?= =?us-ascii?Q?zI6lqQuE4ILKn6Ga6yeP3EprIvxK/2ZYxkP/Yv7YwrnSQ36Xy215poikCnI0?= =?us-ascii?Q?hZ0qZ8gM7y6eeruYRuxWk9YlHFAxUfnxavU0YGjrUYl2QhySwQY2J/p983VZ?= =?us-ascii?Q?6gGr1uZ75qBBtHwkKxKZOPBF0rLIfszqJnTsMdEFBLfzCgo1RSSYOTgUV7Ev?= =?us-ascii?Q?wjMIxdZJfIU2K9ykb8FjkDX5xaEA7aTFSgTVT0aUMo+//uo+af851RccrcMS?= =?us-ascii?Q?l/Q1m87mq+lM6w9CvNCxj0DEkXzr7/beBJ2uPj+uTfL9hmToaD1WtHP5yvk+?= =?us-ascii?Q?ew+5KsVSHFGPPDajaNrGP1NKkZQJYVYYyzRMXoIo9gBHaWR9kHIaIUON9lxN?= =?us-ascii?Q?SJHQ4Ub1zHLPbULP3ieKvbfzqBe3LYuiL/OLEkQ7AfYMN/JASaz//kmR5jh9?= =?us-ascii?Q?otWWhGs45jXHRU+5o2J5dYULymDm9NsFodXW8l6Qxk/mKz5IBFFKAcPMVEXq?= =?us-ascii?Q?weowzyj6Qd/hyO5gk5Xnq6rsH66ElkRiAieXe4F5zKDQWe3x1+fNCmjPj0e/?= =?us-ascii?Q?0MFrDgMotPeC0TL6p/T0OHTyzeFacj6lKUziUml/uG5DuDjMak5XBa6itFbY?= =?us-ascii?Q?GxhksivVjU7BwRXjHNkME/V1?= X-OriginatorOrg: oracle.com X-MS-Exchange-CrossTenant-Network-Message-Id: ce312637-9e76-4105-82db-08d95b530946 X-MS-Exchange-CrossTenant-AuthSource: BY5PR10MB3793.namprd10.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 09 Aug 2021 16:30:44.7134 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 4e2c6054-71cb-48f1-bd6c-3a9705aca71b X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: MHCXZeob+YJAn9S+hRBtR8OMuYX1qtKSdcpK+mPrrO1vqRFeVJu57NaQeHQ+JrxONu/dcRJO1B/UOhUkdmdgrzAqfHf6Io2KSSZBxXe0oRY= X-MS-Exchange-Transport-CrossTenantHeadersStamped: BYAPR10MB2631 X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=10071 signatures=668682 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 bulkscore=0 suspectscore=0 mlxscore=0 phishscore=0 spamscore=0 mlxlogscore=999 malwarescore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2107140000 definitions=main-2108090119 X-Proofpoint-GUID: gmgWfc7_rk3DYu9NCFUfv9e6jwhZgBYf X-Proofpoint-ORIG-GUID: gmgWfc7_rk3DYu9NCFUfv9e6jwhZgBYf Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Arvind Sankar There are use cases for storing the offset of a symbol in kernel_info. For example, the trenchboot series [0] needs to store the offset of the Measured Launch Environment header in kernel_info. Since commit (note: commit ID from tip/master) 527afc212231 ("x86/boot: Check that there are no run-time relocations") run-time relocations are not allowed in the compressed kernel, so simply using the symbol in kernel_info, as .long symbol will cause a linker error because this is not position-independent. With kernel_info being a separate object file and in a different section from startup_32, there is no way to calculate the offset of a symbol from the start of the image in a position-independent way. To enable such use cases, put kernel_info into its own section which is placed at a predetermined offset (KERNEL_INFO_OFFSET) via the linker script. This will allow calculating the symbol offset in a position-independent way, by adding the offset from the start of kernel_info to KERNEL_INFO_OFFSET. Ensure that kernel_info is aligned, and use the SYM_DATA.* macros instead of bare labels. This stores the size of the kernel_info structure in the ELF symbol table. Signed-off-by: Arvind Sankar Cc: Ross Philipson Signed-off-by: Ross Philipson --- arch/x86/boot/compressed/kernel_info.S | 19 +++++++++++++++---- arch/x86/boot/compressed/kernel_info.h | 12 ++++++++++++ arch/x86/boot/compressed/vmlinux.lds.S | 6 ++++++ 3 files changed, 33 insertions(+), 4 deletions(-) create mode 100644 arch/x86/boot/compressed/kernel_info.h diff --git a/arch/x86/boot/compressed/kernel_info.S b/arch/x86/boot/compressed/kernel_info.S index f818ee8..c18f071 100644 --- a/arch/x86/boot/compressed/kernel_info.S +++ b/arch/x86/boot/compressed/kernel_info.S @@ -1,12 +1,23 @@ /* SPDX-License-Identifier: GPL-2.0 */ +#include #include +#include "kernel_info.h" - .section ".rodata.kernel_info", "a" +/* + * If a field needs to hold the offset of a symbol from the start + * of the image, use the macro below, eg + * .long rva(symbol) + * This will avoid creating run-time relocations, which are not + * allowed in the compressed kernel. + */ + +#define rva(X) (((X) - kernel_info) + KERNEL_INFO_OFFSET) - .global kernel_info + .section ".rodata.kernel_info", "a" -kernel_info: + .balign 16 +SYM_DATA_START(kernel_info) /* Header, Linux top (structure). */ .ascii "LToP" /* Size. */ @@ -19,4 +30,4 @@ kernel_info: kernel_info_var_len_data: /* Empty for time being... */ -kernel_info_end: +SYM_DATA_END_LABEL(kernel_info, SYM_L_LOCAL, kernel_info_end) diff --git a/arch/x86/boot/compressed/kernel_info.h b/arch/x86/boot/compressed/kernel_info.h new file mode 100644 index 0000000..c127f84 --- /dev/null +++ b/arch/x86/boot/compressed/kernel_info.h @@ -0,0 +1,12 @@ +/* SPDX-License-Identifier: GPL-2.0 */ + +#ifndef BOOT_COMPRESSED_KERNEL_INFO_H +#define BOOT_COMPRESSED_KERNEL_INFO_H + +#ifdef CONFIG_X86_64 +#define KERNEL_INFO_OFFSET 0x500 +#else /* 32-bit */ +#define KERNEL_INFO_OFFSET 0x100 +#endif + +#endif /* BOOT_COMPRESSED_KERNEL_INFO_H */ diff --git a/arch/x86/boot/compressed/vmlinux.lds.S b/arch/x86/boot/compressed/vmlinux.lds.S index 112b237..84c7b4d 100644 --- a/arch/x86/boot/compressed/vmlinux.lds.S +++ b/arch/x86/boot/compressed/vmlinux.lds.S @@ -7,6 +7,7 @@ OUTPUT_FORMAT(CONFIG_OUTPUT_FORMAT) #include #include +#include "kernel_info.h" #ifdef CONFIG_X86_64 OUTPUT_ARCH(i386:x86-64) @@ -27,6 +28,11 @@ SECTIONS HEAD_TEXT _ehead = . ; } + .rodata.kernel_info KERNEL_INFO_OFFSET : { + *(.rodata.kernel_info) + } + ASSERT(ABSOLUTE(kernel_info) == KERNEL_INFO_OFFSET, "kernel_info at bad address!") + .rodata..compressed : { *(.rodata..compressed) } -- 1.8.3.1