From patchwork Sat Mar 2 00:17:07 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Edgecombe, Rick P" X-Patchwork-Id: 13579293 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.15]) (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 338D51C16; Sat, 2 Mar 2024 00:17:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.15 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709338648; cv=none; b=Nam1Fhn0nbTrbLPnTQMAMRtHTZ8/GQ18JoOnsABlbzIXbpbPZXaGbzWP0XCpAd8Gh6mj7fs8L121FOkQ3o4HadnaLGGZQjIrmhwfkgSKX7WNHBtqZ7EVojxjCYuwNODxTC6hwNHGRni7rXm7CythVRUOjCrlUDB7ETrqxmJ4LRE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709338648; c=relaxed/simple; bh=fMBi/ufd5ZOexUOqlfCmPgfMqIc8RakdzkWbcDbuUI0=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=OqGaYwFdDiTtVFfkKY6SBTZaXftouM1Qdgo3hIDexyzzZIfxd6XS2b/9MlUK9iFGQA+0SrxurZ01I0CiHL3NX2FtshVBAMh0vtWQwJYxJ72jDAdC/evAnOqSqOnM3tRwICr7dnm3IGF3IyKzIen/TyGzK8X+rzvz0uX3RzITob8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=PQUy1ku1; arc=none smtp.client-ip=198.175.65.15 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="PQUy1ku1" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1709338646; x=1740874646; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=fMBi/ufd5ZOexUOqlfCmPgfMqIc8RakdzkWbcDbuUI0=; b=PQUy1ku1J5UYK5kAUKQ60Ed05S6OjChSgwKkR1BPslXB7GxRrTp/eGPx 8YI0ZfmPzEAn9ztBX5Ow+R7T3UE7L/CEra2Tn65BAwWSA8YZtdhHTtgfi ETy3DLGf8aeBLJbfM44z1FfEUeAc/JFT4BX+g70zox7cRTs20wbdVU2Wh jjKfyQCfgArT6GNZITeIh+HzDxPDTdV+eU6haV/cgFzNwT5L31W7Um5hh bn4A+/c7klxBjKPBY2fT6JNxCeq2YRL4mooblQRiAYGAH0FGRae741H2/ m00162gkAEePoxKoP7bH5UZ+ZxUsC7kTa7ei+YqGvUJzDh9P4FoKlQQdl Q==; X-IronPort-AV: E=McAfee;i="6600,9927,11000"; a="7715723" X-IronPort-AV: E=Sophos;i="6.06,197,1705392000"; d="scan'208";a="7715723" Received: from fmviesa008.fm.intel.com ([10.60.135.148]) by orvoesa107.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 01 Mar 2024 16:17:25 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.06,197,1705392000"; d="scan'208";a="8495970" Received: from thwood-mobl1.amr.corp.intel.com (HELO rpedgeco-desk4.intel.com) ([10.251.7.75]) by fmviesa008-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 01 Mar 2024 16:17:24 -0800 From: Rick Edgecombe To: rick.p.edgecombe@intel.com Cc: Liam.Howlett@oracle.com, akpm@linux-foundation.org, bp@alien8.de, broonie@kernel.org, dave.hansen@linux.intel.com, debug@rivosinc.com, hpa@zytor.com, keescook@chromium.org, kirill.shutemov@linux.intel.com, luto@kernel.org, mingo@redhat.com, peterz@infradead.org, sparclinux@vger.kernel.org, tglx@linutronix.de, x86@kernel.org, Thomas Bogendoerfer , linux-mips@vger.kernel.org Subject: [RFC v2.1 05/12] MIPS: Use initializer for struct vm_unmapped_area_info Date: Fri, 1 Mar 2024 16:17:07 -0800 Message-Id: <20240302001714.674091-5-rick.p.edgecombe@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240302001714.674091-1-rick.p.edgecombe@intel.com> References: <20240226190951.3240433-6-rick.p.edgecombe@intel.com> <20240302001714.674091-1-rick.p.edgecombe@intel.com> Precedence: bulk X-Mailing-List: linux-mips@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Future changes will need to add a new member to struct vm_unmapped_area_info. This would cause trouble for any call site that doesn't initialize the struct. Currently every caller sets each field manually, so if new fields are added they will be unitialized and the core code parsing the struct will see garbage in the new field. It could be possible to initialize the new field manually to 0 at each call site. This and a couple other options were discussed, and the consensus (see links) was that in general the best way to accomplish this would be via static initialization with designated field initiators. Having some struct vm_unmapped_area_info instances not zero initialized will put those sites at risk of feeding garbage into vm_unmapped_area() if the convention is to zero initialize the struct and any new field addition misses a call site that initializes each field manually. It could be possible to leave the code mostly untouched, and just change the line: struct vm_unmapped_area_info info to: struct vm_unmapped_area_info info = {}; However, that would leave cleanup for the fields that are manually set to zero, as it would no longer be required. So to be reduce the chance of bugs via uninitialized fields, instead simply continue the process to initialize the struct this way tree wide. This will zero any unspecified members. Move the field initializers to the struct declaration when they are known at that time. Leave the fields out that were manually initialized to zero, as this would be redundant for designated initializers. Signed-off-by: Rick Edgecombe Cc: Thomas Bogendoerfer Cc: linux-mips@vger.kernel.org Link: https://lore.kernel.org/lkml/202402280912.33AEE7A9CF@keescook/#t Link: https://lore.kernel.org/lkml/j7bfvig3gew3qruouxrh7z7ehjjafrgkbcmg6tcghhfh3rhmzi@wzlcoecgy5rs/ --- Hi, This patch was split and refactored out of a tree-wide change [0] to just zero-init each struct vm_unmapped_area_info. The overall goal of the series is to help shadow stack guard gaps. Currently, there is only one arch with shadow stacks, but two more are in progress. It is 0day tested only. Thanks, Rick [0] https://lore.kernel.org/lkml/20240226190951.3240433-6-rick.p.edgecombe@intel.com/ --- arch/mips/mm/mmap.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) diff --git a/arch/mips/mm/mmap.c b/arch/mips/mm/mmap.c index 00fe90c6db3e..f69ed0dfb696 100644 --- a/arch/mips/mm/mmap.c +++ b/arch/mips/mm/mmap.c @@ -34,7 +34,12 @@ static unsigned long arch_get_unmapped_area_common(struct file *filp, struct vm_area_struct *vma; unsigned long addr = addr0; int do_color_align; - struct vm_unmapped_area_info info; + struct vm_unmapped_area_info info = { + .low_limit = mm->mmap_base, + .high_limit = TASK_SIZE, + .length = len, + .align_offset = pgoff << PAGE_SHIFT + }; if (unlikely(len > TASK_SIZE)) return -ENOMEM; @@ -71,9 +76,7 @@ static unsigned long arch_get_unmapped_area_common(struct file *filp, return addr; } - info.length = len; info.align_mask = do_color_align ? (PAGE_MASK & shm_align_mask) : 0; - info.align_offset = pgoff << PAGE_SHIFT; if (dir == DOWN) { info.flags = VM_UNMAPPED_AREA_TOPDOWN; @@ -92,9 +95,6 @@ static unsigned long arch_get_unmapped_area_common(struct file *filp, */ } - info.flags = 0; - info.low_limit = mm->mmap_base; - info.high_limit = TASK_SIZE; return vm_unmapped_area(&info); }