From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (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 3D058322B81 for ; Tue, 3 Feb 2026 04:14:56 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.129.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770092099; cv=none; b=CcZUcuPV/ZYA1IEKUgZxtq8E/HwvaCT5+Hojl6uzvZf1JQBIzm2X0BaK5iuxtfsHi7mtw4RKBYdbWTQ7IYkJ9RJrPmxXS8GDKIlBOw3w2AHnsB1lsTfsTi7ppw0l12utsbHD/bc35InxQu+HxdnurigdcyO9Vrc9jkG+LHQiUbw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770092099; c=relaxed/simple; bh=sJHfecm+9PgAuBM+q5zub2xzR1ygcAgU4V485eo94bw=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=mu3wHLOD0WWbJL7K32dPmu6ctd5+cgPZGUA1VRdv1ngmjhn+yjhU2UP3qx+4APuqn74d1UQqQ5X6g0MsV8glWyTdmUoYMUwVX8xcwRYpwwSv+vB/EEq3iljDY51/lIy6vX38/VULYDTzrLz1ol7Cu0+6Tck0cRCMAC43LJxHuaM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=WhA8x6X4; dkim=pass (2048-bit key) header.d=redhat.com header.i=@redhat.com header.b=axx/kBkY; arc=none smtp.client-ip=170.10.129.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="WhA8x6X4"; dkim=pass (2048-bit key) header.d=redhat.com header.i=@redhat.com header.b="axx/kBkY" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1770092095; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=6/dgoz1907GpWsw9tjXtaDcvG7jiC8B/ivCp+i6DkyU=; b=WhA8x6X4mgZzugHBzGKqO94MEwtrST3MES/4yeJpt3pkO15pxMNx8dhQKcfaSyxsWnAFWM FWgWRaol7ElpLXeYwxo7ziIVq3GmYe1H4sAlzGUJ1IAalAvYBEWQ56hA8L/XYgey56PmFK 6s8WsPZ9u1Q+OIZG1mg2TltJj3+z4Jo= Received: from mail-pl1-f200.google.com (mail-pl1-f200.google.com [209.85.214.200]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-157-JpZ81wtYMlCwQ_xARBxuwA-1; Mon, 02 Feb 2026 23:14:54 -0500 X-MC-Unique: JpZ81wtYMlCwQ_xARBxuwA-1 X-Mimecast-MFC-AGG-ID: JpZ81wtYMlCwQ_xARBxuwA_1770092093 Received: by mail-pl1-f200.google.com with SMTP id d9443c01a7336-29f1f69eec6so57131565ad.1 for ; Mon, 02 Feb 2026 20:14:54 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=google; t=1770092093; x=1770696893; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=6/dgoz1907GpWsw9tjXtaDcvG7jiC8B/ivCp+i6DkyU=; b=axx/kBkYL1CPFtKWI5IIZ+8AQt2xA1T8NtULKnIuCBZj7LQ4LUgb3hF4H8JYcrWli2 2Jk4W8EE76KTlQwQh3kcgSudYIjx0aDhJt7vGuHqbomnN4Fi1/2ecH3Roy34/B00YH/v oz5wxvtTs2mAnVbls5nQNVP2ktEhSznODOU51HfUzh4Ku7vidZ78GIEk0SzKyaAyNIIH ycreb5/iYZGmHDGx9qaTTkBi3YGPW0wdZvZ0n2qFKRnOsYvAOCdxmP6i2D1p+PkeF7aS KYyf7J5X3ogKwpFlUsB7lLl2/q7rhcoSvIXJvaTm7cdUxFHJxhXB/QwGtrfdns1rE7C/ 0/cw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1770092093; x=1770696893; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to; bh=6/dgoz1907GpWsw9tjXtaDcvG7jiC8B/ivCp+i6DkyU=; b=ep4cx2qFTSfLVbI+UCAL3tPy4Qf97yM1UZr9XH+C+uFy71p4QQTO/qox7ZiTRZIXrN iS3ZDXvkPyBvydEVxqPyej7jV50wBkcLMvrOTANr7tNT+P52rY3mwSR/ubXCuOQhrbaE w/JmrsYWajPPr8gFyrxB2fovQ6DnxDpJONDZBAP7Zl/ESNMtQ9SbFcvqXu2tPr8ytQ9+ M9dkC5O4tsH6zeXgZOOjCvwZqXylGsmBZvHRNp9zqMWKJ655tOR2XG0q8i5V43nAlmRX 5VtKH5wn+jXsc7/42WSwuVIDFTHVjuYRk+HwxPhl6z6FIrSOX1DRoslQjbeCAWl6X8dj 7ShQ== X-Forwarded-Encrypted: i=1; AJvYcCVYPmsAxr3UF6gAc2wgsplLSPUiHBLUVM7SyCEWseBqxmh96OOccGSRuG/+vtkqMHXa49pzI8RmW6fCTPg=@vger.kernel.org X-Gm-Message-State: AOJu0Yze9zN6POE+1sAot4Ain50vHL9nhKmTThOxVRximAStrBQQmTJ4 uhOwBKf7LQ+hsmVhfqr3ALQb7bkdk3/8laOwYouuNinY2Xa3DGxQGCaHAchNstiZaBc5yiwRnp6 8rr0QvvdOdDT+sBGyJhGFz/Fz+VRG+i8C1Pmjxd3iomPTIWqpz1OGsgHba7lmQl2tdA== X-Gm-Gg: AZuq6aIWVZSfSgLiKAXB3ACNUAhUtbE/t5HdQTA1Uv24ZPgaVKsCABmY5OQ8El0T1aa 2WVANou0MrgsCdrx9PBLl2YzQC8dhpg0bl5RVDmxsnzl3SYnmmoh9W1s9mt65ic2V8RT8fzSVBp 8qgh/vJQJ0wdVudZHZbx2pwue6VkaIHwifJs203AoLOa53zSHkMLnRsZwAa58cu6IleY1EnhxfR S/r6bWo0SRG204q23AF1FJUiOr9uLU1h7HwUOW57zj1wjvpRrVA18vOqpdDcg+K36wKsdap1yQA nPj2E13Q+W7a3u2UkmLsanHXooYPEQFJNzXJkbxfXFC8PD6Xb9e4Fv+2n06DlXn/BxtXewt3BvZ c X-Received: by 2002:a17:903:46cb:b0:297:d764:9874 with SMTP id d9443c01a7336-2a8d96a7688mr136629885ad.21.1770092092972; Mon, 02 Feb 2026 20:14:52 -0800 (PST) X-Received: by 2002:a17:903:46cb:b0:297:d764:9874 with SMTP id d9443c01a7336-2a8d96a7688mr136629755ad.21.1770092092472; Mon, 02 Feb 2026 20:14:52 -0800 (PST) Received: from localhost ([209.132.188.88]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2a88b5d93cdsm157121635ad.70.2026.02.02.20.14.51 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 02 Feb 2026 20:14:52 -0800 (PST) From: Coiby Xu To: linux-integrity@vger.kernel.org Cc: Heiko Carstens , Alexander Egorenkov , Ard Biesheuvel , Dave Hansen , Mimi Zohar , Roberto Sassu , Dmitry Kasatkin , Eric Snowberg , Paul Moore , James Morris , "Serge E. Hallyn" , linux-security-module@vger.kernel.org (open list:SECURITY SUBSYSTEM), linux-kernel@vger.kernel.org (open list) Subject: [PATCH v2 2/3] evm: Don't enable fix mode when secure boot is enabled Date: Tue, 3 Feb 2026 12:14:30 +0800 Message-ID: <20260203041434.872784-3-coxu@redhat.com> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260203041434.872784-1-coxu@redhat.com> References: <20260203041434.872784-1-coxu@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Similar to IMA fix mode, forbid EVM fix mode when secure boot is enabled. Reported-and-suggested-by: Mimi Zohar Suggested-by: Roberto Sassu Signed-off-by: Coiby Xu --- security/integrity/evm/evm_main.c | 24 +++++++++++++++++------- 1 file changed, 17 insertions(+), 7 deletions(-) diff --git a/security/integrity/evm/evm_main.c b/security/integrity/evm/evm_main.c index 73d500a375cb..a54cb73b51ee 100644 --- a/security/integrity/evm/evm_main.c +++ b/security/integrity/evm/evm_main.c @@ -72,17 +72,25 @@ static struct xattr_list evm_config_default_xattrnames[] = { LIST_HEAD(evm_config_xattrnames); +static char *evm_cmdline __initdata; +core_param(evm, evm_cmdline, charp, 0); + static int evm_fixmode __ro_after_init; -static int __init evm_set_fixmode(char *str) +static void __init evm_set_fixmode(void) { - if (strncmp(str, "fix", 3) == 0) - evm_fixmode = 1; - else - pr_err("invalid \"%s\" mode", str); + if (!evm_cmdline) + return; - return 1; + if (strncmp(evm_cmdline, "fix", 3) == 0) { + if (arch_get_secureboot()) { + pr_info("Secure boot enabled: ignoring evm=fix"); + return; + } + evm_fixmode = 1; + } else { + pr_err("invalid \"%s\" mode", evm_cmdline); + } } -__setup("evm=", evm_set_fixmode); static void __init evm_init_config(void) { @@ -1119,6 +1127,8 @@ static int __init init_evm(void) evm_init_config(); + evm_set_fixmode(); + error = integrity_init_keyring(INTEGRITY_KEYRING_EVM); if (error) goto error; -- 2.52.0