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Wysocki" CC: Len Brown , Tony Luck , "Punit Agrawal" , , Subject: [PATCH v2 0/2] ACPI: sysfs: Expose BDAT data region Date: Mon, 12 Oct 2026 16:06:30 -0700 Message-ID: <20261012230632.3574987-1-jamien@nvidia.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: MW2PEPF00014675:EE_|SA3PR12MB7858:EE_ X-MS-Office365-Filtering-Correlation-Id: cfb93bd9-bf65-4507-cf45-08df28b5895c X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|1800799024|23010399003|82310400026|36860700016|261009223027099003|56012099006|11063799006|10067099003|18002099003|6133799003|13003099007; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:216.228.117.161;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc6edge2.nvidia.com;CAT:NONE;SFS:(13230040)(376014)(1800799024)(23010399003)(82310400026)(36860700016)(261009223027099003)(56012099006)(11063799006)(10067099003)(18002099003)(6133799003)(13003099007);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 7ErAPgAe/OOpeH59FMuLJ71kalEok/6LqW8K5lzdb3uzgOQv6uGANgLpQ61EXshbIkymGdzItMGwvFhRqn4u7m6kmGXK9IYShjVunDlLHfw+YGRKwe1j15qIUkcMnF/hOVcZtjc8t5p4GWI0SbSH5NgOVavbnoaxrdVwHDoyCj2q2TLknVsouE3yINrLIatKYWGhUEuFhgCFiWZFXcaO/jf/c9Uh0RkiOAlfQCrihXDOYjekWkURFdRwrzvFQenWAUbEdaWgsNkaKQGJFfyuk9DlQNvpZfeyyIcdkgfpWjQDzy+zb+NQg8+nS/z6/HkvEuh5p9aJT3L3p3GvmF0poNYw2cpDZaqdbZfHaXLxG+8UnYIUp7qqxlVyW7NhpO6HlRJK2JUB7DnOS+IPF2QK9ubpbgenTCKqkTeaMrNfXrPEi8DLcKtaak8/6ieXAhpl X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 12 Oct 2026 23:07:06.7150 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: cfb93bd9-bf65-4507-cf45-08df28b5895c X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.161];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: MW2PEPF00014675.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA3PR12MB7858 The BIOS Data ACPI Table (BDAT) points to a firmware data structure that carries memory training results and other boot-time data. Patch 2 exposes that data as /sys/firmware/acpi/tables/data/BDAT, like the existing BERT and CCEL data files. Patch 1 fixes a leak in the existing data file code, where data_attr is not freed if sysfs_create_bin_file() fails. It moves the file creation and the cleanup into acpi_table_data_init(), and patch 2 builds on that. Changes in v2: - New patch 1, fixing the data_attr leak for BERT and CCEL as well. - Patch 2: the BDAT callback only checks the table and sets the address and size of the data, and returns -ENOMEM if mapping the header fails. v1: https://lore.kernel.org/r/20261009232955.866131-1-jamien@nvidia.com Tested on an arm64 server (64K pages): - The file matches a /dev/mem dump of the data region taken in the same boot, byte for byte, and decodes with valid CRCs. - With lockdown=integrity, /dev/mem is refused and the file still reads. - Malformed BDAT tables loaded via initrd table upgrade (test-only change adding BDAT to table_sigs[]) are rejected without creating a file: no "BDATHEAD" signature, size below the header, non-memory address space, zero address, and a table shorter than struct acpi_table_bdat. - With a test-only change that makes sysfs_create_bin_file() fail with -EEXIST for one BDAT table, kmemleak reports its data_attr as leaked without patch 1, and the data_attr is freed with patch 1 applied. Jamie Nguyen (2): ACPI: sysfs: Fix data_attr leak when creating a data file fails ACPI: sysfs: Expose BDAT data region Documentation/ABI/testing/sysfs-firmware-acpi | 12 ++++ drivers/acpi/sysfs.c | 69 ++++++++++++++++--- 2 files changed, 71 insertions(+), 10 deletions(-) base-commit: af32da41b0327b9c6a37856ba82b6760d6c8d10e -- 2.43.0