From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 16675C41513 for ; Wed, 26 Jun 2024 13:56:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:Message-ID:Date:Subject:Cc:To:From:Reply-To:Content-Type: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References:List-Owner; bh=ElRwMJryiLcDzY3l7xy1FrJtnhufSrTOPCrLy9/uir4=; b=fe1p55dTQtfI69IfyB8Px3eXDs QUs6hnffRAGbMJZQ9P2C7ZVcpjFUGni31OF5yD5/ER5x3GJxqEheYQhOiy+m5SIKJfZ9u+IQjY0yv +FrV0d6K92CcyyfoWjtxsBiU1khn1qyTodLxc2mWZo+GADtNgugbdva3Bc5koIiuh2ekReMA0SaDX B/0zT/ZEmlNeh9C7ZUuIpPCFErTepE7UB2mMmj1Yq0NiquveEew5E7Vq+uO0wwSeqr9O3u4Bo0g9n dc0c8GwTbyaXYyAqgqrUc5a/oRVCZME7PqJ1lD3IZukLIKbvwPqgLrtan4zYmAaXGoJ2LZL2XV5lR 0v6A1BjA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1sMT87-000000074fW-0tXP; Wed, 26 Jun 2024 13:56:11 +0000 Received: from s3.sipsolutions.net ([2a01:4f8:242:246e::2] helo=sipsolutions.net) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1sMT7z-000000074c2-46F3 for linux-um@lists.infradead.org; Wed, 26 Jun 2024 13:56:09 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=sipsolutions.net; s=mail; h=Content-Transfer-Encoding:MIME-Version: Message-ID:Date:Subject:Cc:To:From:Content-Type:Sender:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-To:Resent-Cc: Resent-Message-ID:In-Reply-To:References; bh=ElRwMJryiLcDzY3l7xy1FrJtnhufSrTOPCrLy9/uir4=; t=1719410162; x=1720619762; b=qxWQDanoQw5R3M8sS0B+p2uFpvawt/oNdo6nlpNxyEru2BMP1WajPEAaIznnymysh4HQa+WAGy0 CyWTpFFNEcwbJ5tRe38sR3Ef3FdTtJeytxYD5g8qIl1OfjeCHoi+9WSl8PSYFy9w1sHSFmG0WQT0o YxajFBSudnLSjS9d8k0NICCwFPYhWeg7CphxwOk7C7uz7wsX+kKKgbX0jEO06WbUA3w6vb4G48cbr QyT06oDQL2OmYhQcYGI1rUOz+nHs+RcLyhRUGs7ZQ/Mvqkg2rwC0qgc/OGVR6t3PJ4squ2lFLDUeh ch5K6kLkTdsXVqLuxS1jksAM2C1gW6gbvqEQ==; Received: by sipsolutions.net with esmtpsa (TLS1.3:ECDHE_X25519__RSA_PSS_RSAE_SHA256__AES_256_GCM:256) (Exim 4.97) (envelope-from ) id 1sMT7v-00000003rXd-1JTL; Wed, 26 Jun 2024 15:55:59 +0200 From: Benjamin Berg To: linux-um@lists.infradead.org Cc: Benjamin Berg Subject: [PATCH v6 0/7] Increased address space for 64 bit Date: Wed, 26 Jun 2024 15:53:43 +0200 Message-ID: <20240626135350.493110-1-benjamin@sipsolutions.net> X-Mailer: git-send-email 2.45.2 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240626_065604_349916_3ED5FA27 X-CRM114-Status: GOOD ( 10.94 ) X-BeenThere: linux-um@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-um" Errors-To: linux-um-bounces+linux-um=archiver.kernel.org@lists.infradead.org From: Benjamin Berg The new version of the patchset uses execveat on a memfd instead of cloning twice to disable rseq. This should be much more robust going forward as it will also avoid issues with other new features like mseal. This patchset fixes a few bugs, adds a new method of discovering the host task size and finally adds four level page table support. All of this means the userspace TASK_SIZE is much larger and in turns permits userspace applications that need a lot of virtual addresses to work fine. One such application is ASAN which uses a fixed address in memory that would otherwise not be addressable. v6: * Apply fixes pointed out by Tiwei Bie * Add temporary file fallback as memfd is not always supported v5: * Use execveat with memfd instead of double clone v4: * Do not use WNOHANG in wait for CLONE_VFORK v3: * Undo incorrect change in child wait loop v2: * Improved double clone logic using CLONE_VFORK * Kconfig fixes pointed out by Tiwei Bie Benjamin Berg (7): um: Add generic stub_syscall6 function um: Add generic stub_syscall1 function um: use execveat to create userspace MMs um: Fix stub_start address calculation um: Limit TASK_SIZE to the addressable range um: Discover host_task_size from envp um: Add 4 level page table support arch/um/Kconfig | 1 + arch/um/include/asm/page.h | 14 +- arch/um/include/asm/pgalloc.h | 11 +- arch/um/include/asm/pgtable-4level.h | 119 +++++++++++++++++ arch/um/include/asm/pgtable.h | 6 +- arch/um/include/shared/as-layout.h | 2 +- arch/um/include/shared/os.h | 2 +- arch/um/include/shared/skas/stub-data.h | 11 ++ arch/um/kernel/mem.c | 17 ++- arch/um/kernel/um_arch.c | 14 +- arch/um/os-Linux/main.c | 9 +- arch/um/os-Linux/skas/process.c | 171 ++++++++++++++++-------- arch/x86/um/.gitignore | 2 + arch/x86/um/Kconfig | 38 ++++-- arch/x86/um/Makefile | 32 ++++- arch/x86/um/os-Linux/task_size.c | 19 ++- arch/x86/um/shared/sysdep/stub_32.h | 22 +++ arch/x86/um/shared/sysdep/stub_64.h | 27 ++++ arch/x86/um/stub_elf.c | 86 ++++++++++++ arch/x86/um/stub_elf_embed.S | 11 ++ 20 files changed, 528 insertions(+), 86 deletions(-) create mode 100644 arch/um/include/asm/pgtable-4level.h create mode 100644 arch/x86/um/.gitignore create mode 100644 arch/x86/um/stub_elf.c create mode 100644 arch/x86/um/stub_elf_embed.S -- 2.45.2