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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 787E3C433EF for ; Tue, 12 Jul 2022 19:02:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235144AbiGLTCG (ORCPT ); Tue, 12 Jul 2022 15:02:06 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40412 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235152AbiGLTAz (ORCPT ); Tue, 12 Jul 2022 15:00:55 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 436A8B1D7; Tue, 12 Jul 2022 11:48:46 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 20502B81B95; Tue, 12 Jul 2022 18:48:45 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 87D65C3411C; Tue, 12 Jul 2022 18:48:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1657651723; bh=CFdEholKIcIh8FP/B1CNlCU+W/FG+YpGdXpUqd9CToc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=YfPQphafV4QeYM40WmTJjFFG+BFy7JRVDJrEibOQ4grijfEGftyzD1Phtt9xe/e+t XhW3l+G7eGXT72mzSonehjRRtu8eCEVLNUYnEjp4zWe0JUqhAbAH0uewmI1LyNVHDU EQVZZiAJGzlLjUKFkDQQncJ0NIpyIl3a4r2pS7v8= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, "Peter Zijlstra (Intel)" , Borislav Petkov , Josh Poimboeuf , Thadeu Lima de Souza Cascardo Subject: [PATCH 5.15 36/78] x86/vsyscall_emu/64: Dont use RET in vsyscall emulation Date: Tue, 12 Jul 2022 20:39:06 +0200 Message-Id: <20220712183240.267699225@linuxfoundation.org> X-Mailer: git-send-email 2.37.0 In-Reply-To: <20220712183238.844813653@linuxfoundation.org> References: <20220712183238.844813653@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Peter Zijlstra commit 15583e514eb16744b80be85dea0774ece153177d upstream. This is userspace code and doesn't play by the normal kernel rules. Signed-off-by: Peter Zijlstra (Intel) Signed-off-by: Borislav Petkov Reviewed-by: Josh Poimboeuf Signed-off-by: Borislav Petkov Signed-off-by: Thadeu Lima de Souza Cascardo Signed-off-by: Greg Kroah-Hartman --- arch/x86/entry/vsyscall/vsyscall_emu_64.S | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) --- a/arch/x86/entry/vsyscall/vsyscall_emu_64.S +++ b/arch/x86/entry/vsyscall/vsyscall_emu_64.S @@ -19,17 +19,20 @@ __vsyscall_page: mov $__NR_gettimeofday, %rax syscall - RET + ret + int3 .balign 1024, 0xcc mov $__NR_time, %rax syscall - RET + ret + int3 .balign 1024, 0xcc mov $__NR_getcpu, %rax syscall - RET + ret + int3 .balign 4096, 0xcc