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 E124FCDD552 for ; Thu, 19 Sep 2024 12:45:40 +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=JydPX7TP1sF3IR7U5Z9Mczu4s00M5JLlQZyS6S1H+/Q=; b=WDPDxC154eKOR8QV0Jua45ZDXZ SLNUgiBhSNDCxmwKnn5O+CZv0cnzTqsfXFt8Bqi+PVtq2YYUw9go8c+SU44FNHNNvYZIUpK0KMIV9 eou57lqpUJxnUeE0vQvwEfWoLlUwaCMTzDxgOGRrLdpRWiSvZOtuKbuAzBriurutsrmdvzvJ0KIsE CKqHgHi4egdAM3ocyd0PnFO22QQKnyRq+2rY5VjjYtbNW69OHLLwke1RwT18VZDlUiCAYAPHbptsQ HacOEbH1vYTza1QdWls5pfiI4ZcOLqn5dK5/r2SmYXHEKlXrVvjxDSp1z0tIrtQvP0KvgsWYcHxHo Pvmxiv9g==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1srGXU-0000000AGnu-0SXQ; Thu, 19 Sep 2024 12:45:40 +0000 Received: from s3.sipsolutions.net ([2a01:4f8:242:246e::2] helo=sipsolutions.net) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1srGXR-0000000AGmh-0wVd for linux-um@lists.infradead.org; Thu, 19 Sep 2024 12:45:38 +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=JydPX7TP1sF3IR7U5Z9Mczu4s00M5JLlQZyS6S1H+/Q=; t=1726749935; x=1727959535; b=e7PxDMY9v+p5u6qr1rRmIJnx2VWsJlCM/9wrNBq8BJBdxHerIHfjg7ghQjtkzpp6AzUDF+k2lAo 4VTPwUc6zVnlEQ44HDf5Q8cXvDXbWj9L7RbJmFdsk5cf+Qp8EfnfgnAljXgT/N0JwLEZhlwOvFDHb uuzngAME6gg8MJK54uRb4YqILUmlKLT7nRkf4Dq5N0YoWjN925+ClUuraPIK39iF0qmWyfhsO3oIT mKo51iE41NScKr02TpUWmKg0xUlY25H3EoQ7jfH9OWlKK5NsGVL670BoHoPOxx3UFMASsCdjEVd5C 4BK/XIhCT+lTSU8Lfghn/jBPLsnlijDu6DFA==; Received: by sipsolutions.net with esmtpsa (TLS1.3:ECDHE_X25519__RSA_PSS_RSAE_SHA256__AES_256_GCM:256) (Exim 4.97) (envelope-from ) id 1srGXL-000000047AZ-1Szl; Thu, 19 Sep 2024 14:45:31 +0200 From: Benjamin Berg To: linux-um@lists.infradead.org Cc: Benjamin Berg Subject: [PATCH v9 00/10] Increased address space for 64 bit Date: Thu, 19 Sep 2024 14:45:01 +0200 Message-ID: <20240919124511.282088-1-benjamin@sipsolutions.net> X-Mailer: git-send-email 2.46.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240919_054537_295786_C8A748CC X-CRM114-Status: GOOD ( 15.65 ) 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 switches to four-level page tables on 64 bit. All of this means the userspace TASK_SIZE is much larger and in turn 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. v9: * Drop support for 3-level page tables (on top of Tiwei Bie's patch) * Add patches to set PR_SET_PDEATHSIG for more robust cleanup * Cleanup top address calculation a bit more * Use code address for stub data location v8: * Make changes suggested by Johannes Berg v7: * Plenty of changes to fix 32 bit and improve the logic 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 (10): um: Add generic stub_syscall1 function um: use execveat to create userspace MMs um: Set parent death signal for userspace process um: Set parent death signal for winch thread/process um: Add compile time assert that stub fits on a page um: Calculate stub data address relative to stub code um: Limit TASK_SIZE to the addressable range um: Discover host_task_size from envp um: clear all memory in new userspace processes um: Switch to 4 level page tables on 64 bit arch/um/Kconfig | 4 +- arch/um/Makefile | 3 +- arch/um/drivers/chan_user.c | 3 + arch/um/include/asm/page.h | 14 +- arch/um/include/asm/pgalloc.h | 11 +- .../{pgtable-3level.h => pgtable-4level.h} | 40 +++- arch/um/include/asm/pgtable.h | 8 +- arch/um/include/shared/as-layout.h | 2 +- arch/um/include/shared/os.h | 3 - arch/um/include/shared/skas/stub-data.h | 11 ++ arch/um/kernel/dyn.lds.S | 3 + arch/um/kernel/mem.c | 17 +- arch/um/kernel/skas/.gitignore | 2 + arch/um/kernel/skas/Makefile | 33 +++- arch/um/kernel/skas/mmu.c | 25 +-- arch/um/kernel/skas/stub_exe.c | 91 +++++++++ arch/um/kernel/skas/stub_exe_embed.S | 11 ++ arch/um/kernel/um_arch.c | 34 +++- arch/um/os-Linux/main.c | 9 +- arch/um/os-Linux/mem.c | 2 +- arch/um/os-Linux/skas/process.c | 181 ++++++++++++------ arch/x86/um/Kconfig | 3 - arch/x86/um/os-Linux/Makefile | 2 +- arch/x86/um/os-Linux/task_size.c | 151 --------------- arch/x86/um/shared/sysdep/stub_32.h | 10 +- arch/x86/um/shared/sysdep/stub_64.h | 19 +- 26 files changed, 420 insertions(+), 272 deletions(-) rename arch/um/include/asm/{pgtable-3level.h => pgtable-4level.h} (66%) create mode 100644 arch/um/kernel/skas/.gitignore create mode 100644 arch/um/kernel/skas/stub_exe.c create mode 100644 arch/um/kernel/skas/stub_exe_embed.S delete mode 100644 arch/x86/um/os-Linux/task_size.c -- 2.46.0