45 lines
1.4 KiB
C
45 lines
1.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0
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*
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* Copyright (C) 2026 silt <silt@0xC3.win>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, see <https://www.gnu.org/licenses/>.
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/printk.h>
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#include <linux/types.h>
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#include <linux/version.h>
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#include <linux/string.h>
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#include <asm/msr.h>
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MODULE_AUTHOR("silt <silt@0xC3.win>");
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MODULE_DESCRIPTION("Implements the mitigation for CVE-2025-54505 as described by AMD-SB-7053");
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MODULE_LICENSE("GPL");
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static int __init init(void) {
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pr_info("Applying MSR fix for FP-DSS (CVE-2025-54505, AMD-SB-7053)\n");
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int err = msr_set_bit(0xC0011028, 9);
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if (err < 0) {
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pr_warn("Failed to apply fix for FP-DSS: %d\n", err);
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} else if (err == 0) {
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pr_info("Fix was previously applied. Bailing from init.\n");
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}
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pr_info("Fix applied successfully. Bailing from init.\n");
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return -1;
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}
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module_init(init);
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