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=-9.7 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,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 0BA17C2D0E7 for ; Fri, 27 Mar 2020 02:32:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id DE99D215A4 for ; Fri, 27 Mar 2020 02:32:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727907AbgC0CcN (ORCPT ); Thu, 26 Mar 2020 22:32:13 -0400 Received: from zeniv.linux.org.uk ([195.92.253.2]:48028 "EHLO ZenIV.linux.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727740AbgC0CcL (ORCPT ); Thu, 26 Mar 2020 22:32:11 -0400 Received: from viro by ZenIV.linux.org.uk with local (Exim 4.92.3 #3 (Red Hat Linux)) id 1jHen0-003hRk-Ku; Fri, 27 Mar 2020 02:32:06 +0000 From: Al Viro To: Linus Torvalds Cc: Thomas Gleixner , x86@kernel.org, linux-kernel@vger.kernel.org Subject: [RFC][PATCH v2 11/22] x86: switch ia32_setup_sigcontext() to unsafe_put_user() Date: Fri, 27 Mar 2020 02:31:54 +0000 Message-Id: <20200327023205.881896-11-viro@ZenIV.linux.org.uk> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200327023205.881896-1-viro@ZenIV.linux.org.uk> References: <20200327023007.GS23230@ZenIV.linux.org.uk> <20200327023205.881896-1-viro@ZenIV.linux.org.uk> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Al Viro Signed-off-by: Al Viro --- arch/x86/ia32/ia32_signal.c | 64 +++++++++++++++++++++++---------------------- 1 file changed, 33 insertions(+), 31 deletions(-) diff --git a/arch/x86/ia32/ia32_signal.c b/arch/x86/ia32/ia32_signal.c index 23e2c55d8a59..af673ec23a2d 100644 --- a/arch/x86/ia32/ia32_signal.c +++ b/arch/x86/ia32/ia32_signal.c @@ -158,38 +158,40 @@ static int ia32_setup_sigcontext(struct sigcontext_32 __user *sc, void __user *fpstate, struct pt_regs *regs, unsigned int mask) { - int err = 0; - - put_user_try { - put_user_ex(get_user_seg(gs), (unsigned int __user *)&sc->gs); - put_user_ex(get_user_seg(fs), (unsigned int __user *)&sc->fs); - put_user_ex(get_user_seg(ds), (unsigned int __user *)&sc->ds); - put_user_ex(get_user_seg(es), (unsigned int __user *)&sc->es); - - put_user_ex(regs->di, &sc->di); - put_user_ex(regs->si, &sc->si); - put_user_ex(regs->bp, &sc->bp); - put_user_ex(regs->sp, &sc->sp); - put_user_ex(regs->bx, &sc->bx); - put_user_ex(regs->dx, &sc->dx); - put_user_ex(regs->cx, &sc->cx); - put_user_ex(regs->ax, &sc->ax); - put_user_ex(current->thread.trap_nr, &sc->trapno); - put_user_ex(current->thread.error_code, &sc->err); - put_user_ex(regs->ip, &sc->ip); - put_user_ex(regs->cs, (unsigned int __user *)&sc->cs); - put_user_ex(regs->flags, &sc->flags); - put_user_ex(regs->sp, &sc->sp_at_signal); - put_user_ex(regs->ss, (unsigned int __user *)&sc->ss); - - put_user_ex(ptr_to_compat(fpstate), &sc->fpstate); - - /* non-iBCS2 extensions.. */ - put_user_ex(mask, &sc->oldmask); - put_user_ex(current->thread.cr2, &sc->cr2); - } put_user_catch(err); + if (!user_access_begin(sc, sizeof(struct sigcontext_32))) + return -EFAULT; - return err; + unsafe_put_user(get_user_seg(gs), (unsigned int __user *)&sc->gs, Efault); + unsafe_put_user(get_user_seg(fs), (unsigned int __user *)&sc->fs, Efault); + unsafe_put_user(get_user_seg(ds), (unsigned int __user *)&sc->ds, Efault); + unsafe_put_user(get_user_seg(es), (unsigned int __user *)&sc->es, Efault); + + unsafe_put_user(regs->di, &sc->di, Efault); + unsafe_put_user(regs->si, &sc->si, Efault); + unsafe_put_user(regs->bp, &sc->bp, Efault); + unsafe_put_user(regs->sp, &sc->sp, Efault); + unsafe_put_user(regs->bx, &sc->bx, Efault); + unsafe_put_user(regs->dx, &sc->dx, Efault); + unsafe_put_user(regs->cx, &sc->cx, Efault); + unsafe_put_user(regs->ax, &sc->ax, Efault); + unsafe_put_user(current->thread.trap_nr, &sc->trapno, Efault); + unsafe_put_user(current->thread.error_code, &sc->err, Efault); + unsafe_put_user(regs->ip, &sc->ip, Efault); + unsafe_put_user(regs->cs, (unsigned int __user *)&sc->cs, Efault); + unsafe_put_user(regs->flags, &sc->flags, Efault); + unsafe_put_user(regs->sp, &sc->sp_at_signal, Efault); + unsafe_put_user(regs->ss, (unsigned int __user *)&sc->ss, Efault); + + unsafe_put_user(ptr_to_compat(fpstate), &sc->fpstate, Efault); + + /* non-iBCS2 extensions.. */ + unsafe_put_user(mask, &sc->oldmask, Efault); + unsafe_put_user(current->thread.cr2, &sc->cr2, Efault); + user_access_end(); + return 0; +Efault: + user_access_end(); + return -EFAULT; } /* -- 2.11.0