From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Cyrus-Session-Id: sloti22d1t05-1906823-1518710600-2-2824745914217963228 X-Sieve: CMU Sieve 3.0 X-Spam-known-sender: no X-Spam-score: 0.0 X-Spam-hits: BAYES_00 -1.9, HEADER_FROM_DIFFERENT_DOMAINS 0.001, ME_NOAUTH 0.01, RCVD_IN_DNSWL_HI -5, T_RP_MATCHES_RCVD -0.01, LANGUAGES unknown, BAYES_USED global, SA_VERSION 3.4.0 X-Spam-source: IP='209.132.180.67', Host='vger.kernel.org', Country='US', FromHeader='org', MailFrom='org' X-Spam-charsets: plain='UTF-8' X-Resolved-to: greg@kroah.com X-Delivered-to: greg@kroah.com X-Mail-from: stable-owner@vger.kernel.org ARC-Seal: i=1; a=rsa-sha256; cv=none; d=messagingengine.com; s=arctest; t=1518710599; b=i5P/wkuE8Z7vUuAxparuoT2g/MyfrSLBIrb9uOYS2vy6cwI LThAVSxkhGWdmrCsvUuhy/9+1fDEyEpSRXYZqo0Z5vdbIGfiZX4vrb7KKWixfDgi ntzBUycp4QePLlj2hXfT+725fxxaUxu6fddIDNJejmQhidNtSBk6xiW6MUW6+bJs wCK/3UgRNVGq5oyM8P8BHxtjaxrAy540yTj63Lr7bYxHzuGfa/5hDDweQtW/N5VP 70RULGf/GkPJKZvpDUsSg8JjTt5IBVxoxgsT4EpL5dSWvCSfqaB5y8wDcSAnZQSj 45TqN23GTOYSSBeJVWCTVy675s45SPjV4TNhvhQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=from:to:cc:subject:date:message-id :in-reply-to:references:mime-version:content-type:sender :list-id; s=arctest; t=1518710599; bh=7eZekoUN+QK+9pok6fMrR/vgIy 8wNet0OPks2INjT0I=; b=ABKu0olFa2vVNDkzbIA4isvGhU9YG4ZsGsKA3hZsic PBZ+qoYChPLeJzUlorhFM6/cfDfbuOT/WAo6mpSFLMHsSpVjegouDGBG9MHePYQh zUgzJ9EMOoH4C0x5vr1iaPLvn4iJoZ7TgUcAEZCTyF/AQtX+F3av1UeYEsaYMcA9 BRWyvvftD8/NSlDUW8klOk5APTArdQSB8Ko0B3QicoqhqopJ5Yeh6Yl6KnG5esNv KkDj3UTqx7FFJh9HpFgz7WNXC++zWckiwJRRZPDPUuzpqVLUtJX2cjUgvj7pnd4s 3TaVfIHQORA/nSobqBYYSH/BMlmZj3JTWOe6xal3nnkg== ARC-Authentication-Results: i=1; mx2.messagingengine.com; arc=none (no signatures found); dkim=none (no signatures found); dmarc=none (p=none,has-list-id=yes,d=none) header.from=linuxfoundation.org; iprev=pass policy.iprev=209.132.180.67 (vger.kernel.org); spf=none smtp.mailfrom=stable-owner@vger.kernel.org smtp.helo=vger.kernel.org; x-aligned-from=fail; x-ptr=pass x-ptr-helo=vger.kernel.org x-ptr-lookup=vger.kernel.org; x-return-mx=pass smtp.domain=vger.kernel.org smtp.result=pass smtp_org.domain=kernel.org smtp_org.result=pass smtp_is_org_domain=no header.domain=linuxfoundation.org header.result=pass header_is_org_domain=yes Authentication-Results: mx2.messagingengine.com; arc=none (no signatures found); dkim=none (no signatures found); dmarc=none (p=none,has-list-id=yes,d=none) header.from=linuxfoundation.org; iprev=pass policy.iprev=209.132.180.67 (vger.kernel.org); spf=none smtp.mailfrom=stable-owner@vger.kernel.org smtp.helo=vger.kernel.org; x-aligned-from=fail; x-ptr=pass x-ptr-helo=vger.kernel.org x-ptr-lookup=vger.kernel.org; x-return-mx=pass smtp.domain=vger.kernel.org smtp.result=pass smtp_org.domain=kernel.org smtp_org.result=pass smtp_is_org_domain=no header.domain=linuxfoundation.org header.result=pass header_is_org_domain=yes Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1425132AbeBOQCn (ORCPT ); Thu, 15 Feb 2018 11:02:43 -0500 Received: from mail.linuxfoundation.org ([140.211.169.12]:35734 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1424686AbeBOPqc (ORCPT ); Thu, 15 Feb 2018 10:46:32 -0500 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Max Filippov Subject: [PATCH 4.15 173/202] xtensa: fix futex_atomic_cmpxchg_inatomic Date: Thu, 15 Feb 2018 16:17:53 +0100 Message-Id: <20180215151721.902899501@linuxfoundation.org> X-Mailer: git-send-email 2.16.1 In-Reply-To: <20180215151712.768794354@linuxfoundation.org> References: <20180215151712.768794354@linuxfoundation.org> User-Agent: quilt/0.65 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: stable-owner@vger.kernel.org X-Mailing-List: stable@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: 4.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Max Filippov commit ca47480921587ae30417dd234a9f79af188e3666 upstream. Return 0 if the operation was successful, not the userspace memory value. Check that userspace value equals passed oldval, not itself. Don't update *uval if the value wasn't read from userspace memory. This fixes process hang due to infinite loop in futex_lock_pi. It also fixes a bunch of glibc tests nptl/tst-mutexpi*. Signed-off-by: Max Filippov Signed-off-by: Greg Kroah-Hartman --- arch/xtensa/include/asm/futex.h | 23 ++++++++++------------- 1 file changed, 10 insertions(+), 13 deletions(-) --- a/arch/xtensa/include/asm/futex.h +++ b/arch/xtensa/include/asm/futex.h @@ -92,7 +92,6 @@ futex_atomic_cmpxchg_inatomic(u32 *uval, u32 oldval, u32 newval) { int ret = 0; - u32 prev; if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32))) return -EFAULT; @@ -103,26 +102,24 @@ futex_atomic_cmpxchg_inatomic(u32 *uval, __asm__ __volatile__ ( " # futex_atomic_cmpxchg_inatomic\n" - "1: l32i %1, %3, 0\n" - " mov %0, %5\n" - " wsr %1, scompare1\n" - "2: s32c1i %0, %3, 0\n" - "3:\n" + " wsr %5, scompare1\n" + "1: s32c1i %1, %4, 0\n" + " s32i %1, %6, 0\n" + "2:\n" " .section .fixup,\"ax\"\n" " .align 4\n" - "4: .long 3b\n" - "5: l32r %1, 4b\n" - " movi %0, %6\n" + "3: .long 2b\n" + "4: l32r %1, 3b\n" + " movi %0, %7\n" " jx %1\n" " .previous\n" " .section __ex_table,\"a\"\n" - " .long 1b,5b,2b,5b\n" + " .long 1b,4b\n" " .previous\n" - : "+r" (ret), "=&r" (prev), "+m" (*uaddr) - : "r" (uaddr), "r" (oldval), "r" (newval), "I" (-EFAULT) + : "+r" (ret), "+r" (newval), "+m" (*uaddr), "+m" (*uval) + : "r" (uaddr), "r" (oldval), "r" (uval), "I" (-EFAULT) : "memory"); - *uval = prev; return ret; }