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 X-Spam-Level: X-Spam-Status: No, score=-12.9 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D11E3C4741F for ; Sun, 8 Nov 2020 05:18:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 978AD21D81 for ; Sun, 8 Nov 2020 05:18:18 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=arista.com header.i=@arista.com header.b="AGAilGIv" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728505AbgKHFSB (ORCPT ); Sun, 8 Nov 2020 00:18:01 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37824 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726178AbgKHFR7 (ORCPT ); Sun, 8 Nov 2020 00:17:59 -0500 Received: from mail-wm1-x341.google.com (mail-wm1-x341.google.com [IPv6:2a00:1450:4864:20::341]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A7D1DC0613D3 for ; Sat, 7 Nov 2020 21:17:58 -0800 (PST) Received: by mail-wm1-x341.google.com with SMTP id h2so5098388wmm.0 for ; Sat, 07 Nov 2020 21:17:58 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=arista.com; s=googlenew; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=PJo4NJDNG1P32pfdiK6qTmwCPGbFDEEHy5zNr4wBr24=; b=AGAilGIvOqeJ+SKiMKGXGZ/ISTN8hS/VfK9gs+9QwISNAbZku50Qk7wluelqBJ6kbe 4ANV8HNBWB7HNIw6V1hilfEAfP0FIeoXAj28uB3n3SgTxjj2kC10k4rW4V13S3agH0Ng Dyd4zVbgiCt4+Seu/ofV09cR5iI8JrjElJ/Df2AfHw0A1rt4rz8Rvf7coehfcX2WI7o9 a7Bj98iNZewX4kLg7h/bs4M26kLIlGlFE6ftS2ptEgs6pO+AqoQZ5Aw5EVDShLK1ZP5k KN8xw0fLMQNFZA0R8vuES3sYsnZjZETSYpkxECpmxYBoMbtYP1ys07EuY1ZiqYXGfg1A yBzA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=PJo4NJDNG1P32pfdiK6qTmwCPGbFDEEHy5zNr4wBr24=; b=sV4N/85rv9J/KGUyRIJJvWLgYtBWyycCI2tyl/CHJHYmLvgLuLs9sTLxZOBxc47zsv SehpzdmMaCB7MEuNqd3TcFgMwT8Hb+2+gKcQ92i47dPSZs9oCusGpH03XnjfwJ6xnlRf oiXf3hykbRFGN6dItQboge2JquDjVXIuhZ8yQdlLd9ITGqt1iYn1qruV89d/Z/SQtVCd awfC+vHkhXLMM5j8OJmWq6EGbnFFxHAA4n3+Aeq90ND1v/h972PuOlwy2y/oYucxrR9W v5uO1AwieUQrMy1DUIL82fpdGczpWRufyq6hM6oklcgB0dcTsFneWEiIP8NKdY2q9KRr UCLw== X-Gm-Message-State: AOAM533joWXDGlxc4uD+8jwP/BHoUx00kteOH2FwHvDz3pyYvygrbJDU 7JbjId5zYSKaRlvnF2V8p1x8L2Y3tAD5ibIb X-Google-Smtp-Source: ABdhPJyfXymifjn309sLGsQwZMT9ClM6crIQICSx7N4tqkR9CmakNpsxnYh/CMQ2HrdLqWzR+PjttQ== X-Received: by 2002:a1c:230e:: with SMTP id j14mr7548867wmj.187.1604812677226; Sat, 07 Nov 2020 21:17:57 -0800 (PST) Received: from localhost.localdomain ([2a02:8084:e84:2480:228:f8ff:fe6f:83a8]) by smtp.gmail.com with ESMTPSA id r10sm8378462wmg.16.2020.11.07.21.17.55 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 07 Nov 2020 21:17:56 -0800 (PST) From: Dmitry Safonov To: linux-kernel@vger.kernel.org Cc: Dmitry Safonov <0x7f454c46@gmail.com>, Dmitry Safonov , Alexander Viro , Andrew Morton , Andy Lutomirski , Arnd Bergmann , Borislav Petkov , Catalin Marinas , Christophe Leroy , Guo Ren , "H. Peter Anvin" , Ingo Molnar , Oleg Nesterov , Russell King , Thomas Bogendoerfer , Thomas Gleixner , Vincenzo Frascino , Will Deacon , x86@kernel.org Subject: [PATCH 18/19] arm64/vdso: Migrate native signals to user_landing Date: Sun, 8 Nov 2020 05:17:28 +0000 Message-Id: <20201108051730.2042693-19-dima@arista.com> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20201108051730.2042693-1-dima@arista.com> References: <20201108051730.2042693-1-dima@arista.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Generic way to track the land vma area. As a bonus, after unmapping vdso, kernel won't try to land on its previous position. Signed-off-by: Dmitry Safonov --- arch/arm64/kernel/signal.c | 10 +++++++--- arch/arm64/kernel/vdso.c | 13 +++---------- 2 files changed, 10 insertions(+), 13 deletions(-) diff --git a/arch/arm64/kernel/signal.c b/arch/arm64/kernel/signal.c index bec6ef69704f..4c1dfbc1aed3 100644 --- a/arch/arm64/kernel/signal.c +++ b/arch/arm64/kernel/signal.c @@ -723,9 +723,10 @@ static int get_sigframe(struct rt_sigframe_user_layout *user, return 0; } -static void setup_return(struct pt_regs *regs, struct k_sigaction *ka, +static int setup_return(struct pt_regs *regs, struct k_sigaction *ka, struct rt_sigframe_user_layout *user, int usig) { + unsigned long land = (unsigned long)current->mm->user_landing; __sigrestore_t sigtramp; regs->regs[0] = usig; @@ -754,10 +755,13 @@ static void setup_return(struct pt_regs *regs, struct k_sigaction *ka, if (ka->sa.sa_flags & SA_RESTORER) sigtramp = ka->sa.sa_restorer; + else if (land != UNMAPPED_USER_LANDING) + sigtramp = VDSO_SYMBOL(land, sigtramp); else - sigtramp = VDSO_SYMBOL(current->mm->context.vdso, sigtramp); + return 1; regs->regs[30] = (unsigned long)sigtramp; + return 0; } static int setup_rt_frame(int usig, struct ksignal *ksig, sigset_t *set, @@ -780,7 +784,7 @@ static int setup_rt_frame(int usig, struct ksignal *ksig, sigset_t *set, err |= __save_altstack(&frame->uc.uc_stack, regs->sp); err |= setup_sigframe(&user, regs, set); if (err == 0) { - setup_return(regs, &ksig->ka, &user, usig); + err = setup_return(regs, &ksig->ka, &user, usig); if (ksig->ka.sa.sa_flags & SA_SIGINFO) { err |= copy_siginfo_to_user(&frame->info, &ksig->info); regs->regs[1] = (unsigned long)&frame->info; diff --git a/arch/arm64/kernel/vdso.c b/arch/arm64/kernel/vdso.c index 08e8f1d56d92..d710fcd7141c 100644 --- a/arch/arm64/kernel/vdso.c +++ b/arch/arm64/kernel/vdso.c @@ -78,12 +78,6 @@ static union { } vdso_data_store __page_aligned_data; struct vdso_data *vdso_data = vdso_data_store.data; -static void vdso_mremap(const struct vm_special_mapping *sm, - struct vm_area_struct *new_vma) -{ - current->mm->context.vdso = (void *)new_vma->vm_start; -} - static int __vdso_init(enum vdso_abi abi) { int i; @@ -239,7 +233,6 @@ static int __setup_additional_pages(enum vdso_abi abi, gp_flags = VM_ARM64_BTI; vdso_base += VVAR_NR_PAGES * PAGE_SIZE; - mm->context.vdso = (void *)vdso_base; ret = _install_special_mapping(mm, vdso_base, vdso_text_len, VM_READ|VM_EXEC|gp_flags| VM_MAYREAD|VM_MAYWRITE|VM_MAYEXEC, @@ -247,12 +240,14 @@ static int __setup_additional_pages(enum vdso_abi abi, if (IS_ERR(ret)) goto up_fail; + /* 32-bit ABI is to land on sigpage, 64-bit on vdso */ + if (abi == VDSO_ABI_AA64) + mm->user_landing = (void __user *)vdso_base; *sysinfo_ehdr = vdso_base; return 0; up_fail: - mm->context.vdso = NULL; return PTR_ERR(ret); } @@ -285,7 +280,6 @@ static struct vm_special_mapping aarch32_vdso_maps[] = { }, [AA32_MAP_VDSO] = { .name = "[vdso]", - .mremap = vdso_mremap, }, }; @@ -431,7 +425,6 @@ static struct vm_special_mapping aarch64_vdso_maps[] __ro_after_init = { }, [AA64_MAP_VDSO] = { .name = "[vdso]", - .mremap = vdso_mremap, }, }; -- 2.28.0