From patchwork Thu Dec 12 10:10:00 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Guo Weikang X-Patchwork-Id: 13904948 Received: from mail-pl1-f171.google.com (mail-pl1-f171.google.com [209.85.214.171]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7C7A320FA8A; Thu, 12 Dec 2024 10:10:15 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.171 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733998217; cv=none; b=cx2fXV8h2Jk6Z2EBJ4vGX3n439TC/Esr94Vvrzq6rpKHzf4V0pVbuwdCV9nkPRUomm0QxP98RxZO/AzoAMSLghhrVj/EaVvkgStwc+EJjOrM+t93XHwGiNAQHLqwiszsNqHw2/nA5YvAeuXHoxF9kFLyYW8ml8TZ27XC0ZCBNFM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733998217; c=relaxed/simple; bh=AorsqWl1jCnLZ9DfDFY4FtXuOTptz0N+4mQHfMQ2WEY=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=GKAe/jwB2pIdz4PWZTDv03XBhhaxHeg2cC1W2UaD0DhaItbfC7hdu0C3s2DsoS17CKupfaVHyey7arJ28O5V7Wp6kqZasO2Iw16xlxsOGFZI8kCf3YQzibB88veAd4FaoHssFuDQPQ/XerdH7q14OKTdlxhKeYJDJaxzWE/AKmQ= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=BGsiyAQf; arc=none smtp.client-ip=209.85.214.171 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="BGsiyAQf" Received: by mail-pl1-f171.google.com with SMTP id d9443c01a7336-216281bc30fso4616865ad.0; Thu, 12 Dec 2024 02:10:15 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1733998215; x=1734603015; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=zZanVRx4WAhit1sZ/hOnh7NH4U6nFyxymYnnlN3ZoUU=; b=BGsiyAQfYNayYDDnrN2C0MP48iEcA8LpCIzLPRP9w2djVMkLDaws5P+kmoqwaXklUP MyjGlUaSykPNZNUUnDVV8yPyY8DNBktoekq+EmXQADuwaiaJUv9x849dl1C/L9EnMzoG v3mAgNRyy1pApKHmj7EVTkkfrymEyXZC7Vl3kvOE2CesLEonJrzjv2yI6GGst/iTVJi2 Yc2Fe4Djnid0YMtRd4xbste8aAyM26d7K387/eq3m4dy506quhdtolHRGUWGGXuF5Zv1 pJq/i5vtkiDOwF053OpLaQyhzIJyWySavczhiOoKj/uX+5eb2JHMfcgXaz+X0MMu+oRJ zNVg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1733998215; x=1734603015; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=zZanVRx4WAhit1sZ/hOnh7NH4U6nFyxymYnnlN3ZoUU=; b=CDvD+1kWsY68kN/MieHgUN4egLim/X/dI4K58kev7tZLfpo0ZiMqfQafjFtc2LIlEH vhQDgzi4SQPC1bZ10zzRICFrdbjqJzxDfNhl4Qnm44c8f12UQ4/EHcjphWOW1hCDcrxt nC7j8tQ5EsMaqdmoibVZ52SzdKO15iIOcB2v7Os5bw6ns5dATNs3TgbXnidkF9hj8ep/ 5B5A/o0jASYXR0wHjUpy2cMecu6bxSH5ppVAVSiObfwyJE/oaN8LJbI8WO3wlLMIp/hf wj3WZ8M9pQeAoT1QBXgSKblBME0bywNeyW7XHc1u5ds/9ZFchDnZRfV1pTpZ4NZ+5HbG Ih/A== X-Forwarded-Encrypted: i=1; AJvYcCULlDYDiGj6Cz6+JGSwA68cbyrRBAOOTfVl8agA/EE9dMqQEAMqC35yHlXaXQar/Jnjaqdbhr9vXNKJ@vger.kernel.org, AJvYcCVJsDf67lKkN5OdX/RC6myCN5des5VfEyhrQbTGe7ulDlEpwl4ZM1GwHCD391mD8HyMsP83a+HBIt6K1A==@vger.kernel.org, AJvYcCVQfwjKVx0eEK1lV/pjPm+V+uY5d0RV6z43s27ZSAy1tZXLbiM077j0AuWRc2tMOhvGeQ6KHfpeNZ+4fiOa@vger.kernel.org X-Gm-Message-State: AOJu0YzqSG3HtMwfZBz9dndiYxjM7BAchA8Gv0CIAKj8chiEwGufn4+l uCvLw4oJLOVPQV2AtJPdC3jU6/vFwEQt7PcL8N0CjqyjAS6Fgq5u X-Gm-Gg: ASbGncuDrUeq9DoIBKgO5UGTnNR9NRdNSXzRCw+jB2A/4j8mx87G65lGHiCEgbwgkfy NJrhwYBjcpE5gZJCkVaoWzjCEwpvY7G4DCnQ19OaYU+7Ops2x6XbbzUXgTywFmw0y26CT2kCPv/ 5+jYn9YSfS4NQpc3XOYS9AKPtJAUVVgomkXYVtGgcZAqbezIcl2Xez6t1fVdMXgbfGtustaIoXX uhLHCTZxBhrHxG1JcDA1NLonBI9X9oHGgwduCWdtPNqd9pRNrp9c9lSssthGvYIn8DvIWB/Chhz Dyme X-Google-Smtp-Source: AGHT+IH6gcwPQeo8o7QWFQKnzChC6uQO93gPkmdmDG/SQmzj5FSwJNJHWHb5JoN5L+bUnuXzcp5J7w== X-Received: by 2002:a17:902:d389:b0:215:6816:6345 with SMTP id d9443c01a7336-21778536e08mr75258075ad.16.1733998214774; Thu, 12 Dec 2024 02:10:14 -0800 (PST) Received: from localhost.localdomain ([36.110.106.149]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-7fd1570ae4esm10519521a12.43.2024.12.12.02.10.09 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 12 Dec 2024 02:10:14 -0800 (PST) From: Guo Weikang To: Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , "Rafael J. Wysocki" , Len Brown , Arnd Bergmann , Andrew Morton , Baoquan He , Ard Biesheuvel , "Jason A. Donenfeld" , Julian Stecklina , "Xin Li (Intel)" , Guo Weikang Cc: Ingo Molnar , Kevin Loughlin , "Rafael J. Wysocki" , linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH] mm/early_ioremap: Add null pointer checks to prevent NULL-pointer dereference Date: Thu, 12 Dec 2024 18:10:00 +0800 Message-Id: <20241212101004.1544070-1-guoweikang.kernel@gmail.com> X-Mailer: git-send-email 2.25.1 Precedence: bulk X-Mailing-List: linux-acpi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 The early_ioremap interface can fail and return NULL in certain cases. To prevent NULL-pointer dereference crashes, fixed issues in the acpi_extlog and copy_early_mem interfaces, improving robustness when handling early memory. Signed-off-by: Guo Weikang --- arch/x86/kernel/setup.c | 5 ++++- drivers/acpi/acpi_extlog.c | 14 ++++++++++++++ include/asm-generic/early_ioremap.h | 2 +- mm/early_ioremap.c | 8 +++++++- 4 files changed, 26 insertions(+), 3 deletions(-) diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c index f1fea506e20f..cebee310e200 100644 --- a/arch/x86/kernel/setup.c +++ b/arch/x86/kernel/setup.c @@ -259,6 +259,7 @@ static void __init relocate_initrd(void) u64 ramdisk_image = get_ramdisk_image(); u64 ramdisk_size = get_ramdisk_size(); u64 area_size = PAGE_ALIGN(ramdisk_size); + int ret = 0; /* We need to move the initrd down into directly mapped mem */ u64 relocated_ramdisk = memblock_phys_alloc_range(area_size, PAGE_SIZE, 0, @@ -272,7 +273,9 @@ static void __init relocate_initrd(void) printk(KERN_INFO "Allocated new RAMDISK: [mem %#010llx-%#010llx]\n", relocated_ramdisk, relocated_ramdisk + ramdisk_size - 1); - copy_from_early_mem((void *)initrd_start, ramdisk_image, ramdisk_size); + ret = copy_from_early_mem((void *)initrd_start, ramdisk_image, ramdisk_size); + if (ret) + panic("Copy RAMDISK failed\n"); printk(KERN_INFO "Move RAMDISK from [mem %#010llx-%#010llx] to" " [mem %#010llx-%#010llx]\n", diff --git a/drivers/acpi/acpi_extlog.c b/drivers/acpi/acpi_extlog.c index ca87a0939135..f7fb7205028d 100644 --- a/drivers/acpi/acpi_extlog.c +++ b/drivers/acpi/acpi_extlog.c @@ -251,6 +251,10 @@ static int __init extlog_init(void) } extlog_l1_hdr = acpi_os_map_iomem(l1_dirbase, l1_hdr_size); + if (!extlog_l1_hdr) { + rc = -ENOMEM; + goto err_release_l1_hdr; + } l1_head = (struct extlog_l1_head *)extlog_l1_hdr; l1_size = l1_head->total_len; l1_percpu_entry = l1_head->entries; @@ -268,6 +272,10 @@ static int __init extlog_init(void) goto err; } extlog_l1_addr = acpi_os_map_iomem(l1_dirbase, l1_size); + if (!extlog_l1_addr) { + rc = -ENOMEM; + goto err_release_l1_dir; + } l1_entry_base = (u64 *)((u8 *)extlog_l1_addr + l1_hdr_size); /* remap elog table */ @@ -279,6 +287,10 @@ static int __init extlog_init(void) goto err_release_l1_dir; } elog_addr = acpi_os_map_iomem(elog_base, elog_size); + if (!elog_addr) { + rc = -ENOMEM; + goto err_release_elog; + } rc = -ENOMEM; /* allocate buffer to save elog record */ @@ -300,6 +312,8 @@ static int __init extlog_init(void) if (extlog_l1_addr) acpi_os_unmap_iomem(extlog_l1_addr, l1_size); release_mem_region(l1_dirbase, l1_size); +err_release_l1_hdr: + release_mem_region(l1_dirbase, l1_hdr_size); err: pr_warn(FW_BUG "Extended error log disabled because of problems parsing f/w tables\n"); return rc; diff --git a/include/asm-generic/early_ioremap.h b/include/asm-generic/early_ioremap.h index 9d0479f50f97..5db59a1efb65 100644 --- a/include/asm-generic/early_ioremap.h +++ b/include/asm-generic/early_ioremap.h @@ -35,7 +35,7 @@ extern void early_ioremap_reset(void); /* * Early copy from unmapped memory to kernel mapped memory. */ -extern void copy_from_early_mem(void *dest, phys_addr_t src, +extern int copy_from_early_mem(void *dest, phys_addr_t src, unsigned long size); #else diff --git a/mm/early_ioremap.c b/mm/early_ioremap.c index ce06b2884789..ff35b84a7b50 100644 --- a/mm/early_ioremap.c +++ b/mm/early_ioremap.c @@ -245,7 +245,10 @@ early_memremap_prot(resource_size_t phys_addr, unsigned long size, #define MAX_MAP_CHUNK (NR_FIX_BTMAPS << PAGE_SHIFT) -void __init copy_from_early_mem(void *dest, phys_addr_t src, unsigned long size) +/* + * If no empty slot, handle that and return -ENOMEM. + */ +int __init copy_from_early_mem(void *dest, phys_addr_t src, unsigned long size) { unsigned long slop, clen; char *p; @@ -256,12 +259,15 @@ void __init copy_from_early_mem(void *dest, phys_addr_t src, unsigned long size) if (clen > MAX_MAP_CHUNK - slop) clen = MAX_MAP_CHUNK - slop; p = early_memremap(src & PAGE_MASK, clen + slop); + if (!p) + return -ENOMEM; memcpy(dest, p + slop, clen); early_memunmap(p, clen + slop); dest += clen; src += clen; size -= clen; } + return 0; } #else /* CONFIG_MMU */