From patchwork Mon Sep 2 05:31:28 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Omar Sandoval X-Patchwork-Id: 13786724 Received: from mail-pf1-f176.google.com (mail-pf1-f176.google.com [209.85.210.176]) (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 85D19144D0A for ; Mon, 2 Sep 2024 05:31:49 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.176 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725255111; cv=none; b=X5KXd+m1/ifDm8ZgfDpFfuoqXttwSosXiaHtZ0nUdX6kWYXRSaDCQ81RxFClLprLNN7UCfugd+rroNzDMPYneAocZPoAI02noT2IeOt9FxXlmEeX523SOKaCZ5M185DMpmzEjBXNvhPSPUOoUjVcxfH1YjW+1PIBSSXsgQuhxb4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725255111; c=relaxed/simple; bh=Q7cfUD0xE+Etw31ngKTFcFdjMIVZjmy76Ww6nw1tPQo=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=YQ1PhEtVjzxVXql7+u3/axRQ/f9o15yk3Y4Z45+MZMltralTjiQGObgcyvCnotIAU4cH8hvO46KQ4phxs7MIqRtvewSTR1Gg9VFbKPibZ7Nm+IC9NpK3H3UJZO1axCbe+pcWfdzFOP0it8X9+6D/mSYtG7+c6pR58fZeq6l4YWc= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=osandov.com; spf=none smtp.mailfrom=osandov.com; dkim=pass (2048-bit key) header.d=osandov-com.20230601.gappssmtp.com header.i=@osandov-com.20230601.gappssmtp.com header.b=owCC+s+6; arc=none smtp.client-ip=209.85.210.176 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=osandov.com Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=osandov.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=osandov-com.20230601.gappssmtp.com header.i=@osandov-com.20230601.gappssmtp.com header.b="owCC+s+6" Received: by mail-pf1-f176.google.com with SMTP id d2e1a72fcca58-7174a3baf92so67558b3a.1 for ; Sun, 01 Sep 2024 22:31:49 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=osandov-com.20230601.gappssmtp.com; s=20230601; t=1725255109; x=1725859909; 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=56VTu/qXLVL5nMG+uXbgMEcYFDCqL3Blag2bpSCjYxk=; b=owCC+s+6e4aL4/7TQvNhkEGvAAmSOimjxLERp5zYSkgnasaZ/aCrtYItPoPJTrgKi3 SxsyMK/4rB+DE1XUXvWC1lBzyxd8woS7gmfo/KSIEK2VhUOMV58xZ0ujNKiIs62WmQex P5HWHbOBxqu4c1FJgyWCUHUxORozYRfJj6uSzoYgpSbdzFp0XjSpURFuGWZ9LLIjWFAw mlpOVZZhVP+zUGppykkf0UDSD/MvPbyRP6iqYdjg+FUvlABwpN+kBlHWLrTPGqgF1sFs ihtE//IHdGsHbovs17Aci5E1zAGR3TFuy+BELHv4i2OdF1V0PYhr60QSCz1CTt/AlsGp LO8Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1725255109; x=1725859909; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=56VTu/qXLVL5nMG+uXbgMEcYFDCqL3Blag2bpSCjYxk=; b=sWxFHS9g36I5gg83iQtBqLT8WgwfEVLjy3sWM8KXKRVs9QQFhrMjM+kTZ3lxrgs2Pb /Tv/XRWyVhZiWmDjyVCkg08OUwVukdoyU9CL0DqFzxdepcygee/Wr38p6sc/WgWnrFao LWDvevWVDzBvpB/uMmARjr+hzpJBCIPADyHf4sprATYSZdmBWeINFwTUmLgNHN2Q2awT kXx/yzqMLxPShQ8GOg36Ri3ckyNF3oRBtsMazSrlKWngqx4Qwm/7Ro0BstbHzM4BGOG4 8lOM8KkQHeqio0njXP5kwW9ieXxy+9ODs8JA8gVv1NWoyMliIBo7rjBiyMguN2BH87t4 ysvg== X-Forwarded-Encrypted: i=1; AJvYcCV9W44mbJIBHlT/ESL3pi4OPjXd1YZeIi5MwDkfGD8qJJLdGC5nZcXmo2CsxByZaW38e3S9Jue5naqjN7k=@vger.kernel.org X-Gm-Message-State: AOJu0Yyj+WUiE8vg7t/DvRpDiDWcedIRWlp95Avc/y+f03wbenny/P2w TWWpLODkc4oWe6vLP7H+PU5l4cWoglfT7rAuwDlYe91oSxQMJ7F32Kc8Q7hUXNY= X-Google-Smtp-Source: AGHT+IHP9EQ25y63/ZmPp8u38IbeoRt/KYiwtSvqUDmg44wFA6t/ROSaOYVvZchoffP9nEa6l2KaPg== X-Received: by 2002:a05:6a00:1a8e:b0:714:21c2:efb5 with SMTP id d2e1a72fcca58-717305d65acmr5552903b3a.1.1725255108509; Sun, 01 Sep 2024 22:31:48 -0700 (PDT) Received: from telecaster.hsd1.wa.comcast.net ([2601:602:8980:9170::901f]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-715e55a692fsm6076279b3a.60.2024.09.01.22.31.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 01 Sep 2024 22:31:48 -0700 (PDT) From: Omar Sandoval To: linux-mm@kvack.org, Andrew Morton Cc: Christoph Hellwig , x86@kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, loongarch@lists.linux.dev, linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-um@lists.infradead.org, kernel-team@fb.com Subject: [PATCH 1/2] mm: rename copy_from_kernel_nofault_allowed() to copy_kernel_nofault_allowed() Date: Sun, 1 Sep 2024 22:31:28 -0700 Message-ID: X-Mailer: git-send-email 2.46.0 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-parisc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Omar Sandoval All of the existing checks are applicable to both the "from" and "to" directions, and the next patch needs it for copy_to_kernel_nofault(). Signed-off-by: Omar Sandoval --- arch/arm/mm/fault.c | 2 +- arch/loongarch/mm/maccess.c | 2 +- arch/mips/mm/maccess.c | 2 +- arch/parisc/lib/memcpy.c | 2 +- arch/powerpc/mm/maccess.c | 2 +- arch/um/kernel/maccess.c | 2 +- arch/x86/mm/maccess.c | 4 ++-- include/linux/uaccess.h | 2 +- mm/maccess.c | 7 +++---- 9 files changed, 12 insertions(+), 13 deletions(-) diff --git a/arch/arm/mm/fault.c b/arch/arm/mm/fault.c index ab01b51de559..3fef0a59af4f 100644 --- a/arch/arm/mm/fault.c +++ b/arch/arm/mm/fault.c @@ -27,7 +27,7 @@ #ifdef CONFIG_MMU -bool copy_from_kernel_nofault_allowed(const void *unsafe_src, size_t size) +bool copy_kernel_nofault_allowed(const void *unsafe_src, size_t size) { unsigned long addr = (unsigned long)unsafe_src; diff --git a/arch/loongarch/mm/maccess.c b/arch/loongarch/mm/maccess.c index 58173842c6be..70012ac0a5a8 100644 --- a/arch/loongarch/mm/maccess.c +++ b/arch/loongarch/mm/maccess.c @@ -3,7 +3,7 @@ #include #include -bool copy_from_kernel_nofault_allowed(const void *unsafe_src, size_t size) +bool copy_kernel_nofault_allowed(const void *unsafe_src, size_t size) { /* highest bit set means kernel space */ return (unsigned long)unsafe_src >> (BITS_PER_LONG - 1); diff --git a/arch/mips/mm/maccess.c b/arch/mips/mm/maccess.c index 58173842c6be..70012ac0a5a8 100644 --- a/arch/mips/mm/maccess.c +++ b/arch/mips/mm/maccess.c @@ -3,7 +3,7 @@ #include #include -bool copy_from_kernel_nofault_allowed(const void *unsafe_src, size_t size) +bool copy_kernel_nofault_allowed(const void *unsafe_src, size_t size) { /* highest bit set means kernel space */ return (unsigned long)unsafe_src >> (BITS_PER_LONG - 1); diff --git a/arch/parisc/lib/memcpy.c b/arch/parisc/lib/memcpy.c index 5fc0c852c84c..78758b9a0f49 100644 --- a/arch/parisc/lib/memcpy.c +++ b/arch/parisc/lib/memcpy.c @@ -48,7 +48,7 @@ void * memcpy(void * dst,const void *src, size_t count) EXPORT_SYMBOL(memcpy); -bool copy_from_kernel_nofault_allowed(const void *unsafe_src, size_t size) +bool copy_kernel_nofault_allowed(const void *unsafe_src, size_t size) { if ((unsigned long)unsafe_src < PAGE_SIZE) return false; diff --git a/arch/powerpc/mm/maccess.c b/arch/powerpc/mm/maccess.c index ea821d0ffe16..e0f4c394836c 100644 --- a/arch/powerpc/mm/maccess.c +++ b/arch/powerpc/mm/maccess.c @@ -7,7 +7,7 @@ #include #include -bool copy_from_kernel_nofault_allowed(const void *unsafe_src, size_t size) +bool copy_kernel_nofault_allowed(const void *unsafe_src, size_t size) { return is_kernel_addr((unsigned long)unsafe_src); } diff --git a/arch/um/kernel/maccess.c b/arch/um/kernel/maccess.c index 8ccd56813f68..3497148e9aa5 100644 --- a/arch/um/kernel/maccess.c +++ b/arch/um/kernel/maccess.c @@ -7,7 +7,7 @@ #include #include -bool copy_from_kernel_nofault_allowed(const void *src, size_t size) +bool copy_kernel_nofault_allowed(const void *src, size_t size) { void *psrc = (void *)rounddown((unsigned long)src, PAGE_SIZE); diff --git a/arch/x86/mm/maccess.c b/arch/x86/mm/maccess.c index 42115ac079cf..be28eda2c0b0 100644 --- a/arch/x86/mm/maccess.c +++ b/arch/x86/mm/maccess.c @@ -6,7 +6,7 @@ #include #ifdef CONFIG_X86_64 -bool copy_from_kernel_nofault_allowed(const void *unsafe_src, size_t size) +bool copy_kernel_nofault_allowed(const void *unsafe_src, size_t size) { unsigned long vaddr = (unsigned long)unsafe_src; @@ -36,7 +36,7 @@ bool copy_from_kernel_nofault_allowed(const void *unsafe_src, size_t size) return __is_canonical_address(vaddr, boot_cpu_data.x86_virt_bits); } #else -bool copy_from_kernel_nofault_allowed(const void *unsafe_src, size_t size) +bool copy_kernel_nofault_allowed(const void *unsafe_src, size_t size) { return (unsigned long)unsafe_src >= TASK_SIZE_MAX; } diff --git a/include/linux/uaccess.h b/include/linux/uaccess.h index d8e4105a2f21..297a02b2bd53 100644 --- a/include/linux/uaccess.h +++ b/include/linux/uaccess.h @@ -387,7 +387,7 @@ copy_struct_from_user(void *dst, size_t ksize, const void __user *src, return 0; } -bool copy_from_kernel_nofault_allowed(const void *unsafe_src, size_t size); +bool copy_kernel_nofault_allowed(const void *unsafe_src, size_t size); long copy_from_kernel_nofault(void *dst, const void *src, size_t size); long notrace copy_to_kernel_nofault(void *dst, const void *src, size_t size); diff --git a/mm/maccess.c b/mm/maccess.c index 518a25667323..72e9c03ea37f 100644 --- a/mm/maccess.c +++ b/mm/maccess.c @@ -7,8 +7,7 @@ #include #include -bool __weak copy_from_kernel_nofault_allowed(const void *unsafe_src, - size_t size) +bool __weak copy_kernel_nofault_allowed(const void *unsafe_src, size_t size) { return true; } @@ -28,7 +27,7 @@ long copy_from_kernel_nofault(void *dst, const void *src, size_t size) if (!IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)) align = (unsigned long)dst | (unsigned long)src; - if (!copy_from_kernel_nofault_allowed(src, size)) + if (!copy_kernel_nofault_allowed(src, size)) return -ERANGE; pagefault_disable(); @@ -83,7 +82,7 @@ long strncpy_from_kernel_nofault(char *dst, const void *unsafe_addr, long count) if (unlikely(count <= 0)) return 0; - if (!copy_from_kernel_nofault_allowed(unsafe_addr, count)) + if (!copy_kernel_nofault_allowed(unsafe_addr, count)) return -ERANGE; pagefault_disable();