From patchwork Thu Jan 2 22:06:39 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 234610 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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=unavailable 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 3A1D2C3276F for ; Thu, 2 Jan 2020 22:46:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0F0F824653 for ; Thu, 2 Jan 2020 22:46:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1578005185; bh=rvDDPH2iFigv1nS+TAS1khRR8+8SMltKfuS6SkknOAE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=MN6M/GyR26fdeM2uxFw89UlTnjTNUb+Cq/6uXtUozL19Wc2zgo++/PW+o1mMq+cHU jCS19yYyqkPrT9uzh5Y8nGK+BR7z2u0KqfZ+2367T3TQ4YQa0kvrmJFcDMgEFjQpTb CcEMzfkmQVqHPe4A81+J5cftkYnL34vpbDSepNTM= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730103AbgABWa7 (ORCPT ); Thu, 2 Jan 2020 17:30:59 -0500 Received: from mail.kernel.org ([198.145.29.99]:35538 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730220AbgABWa6 (ORCPT ); Thu, 2 Jan 2020 17:30:58 -0500 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id B067720863; Thu, 2 Jan 2020 22:30:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1578004258; bh=rvDDPH2iFigv1nS+TAS1khRR8+8SMltKfuS6SkknOAE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=YX+Ayh33fk304huiOGwDdh3lxyTdNwUACMjG2hStbAYswXQQmzP7AZWubaQh+Qw76 b3V8JgO2F47XB7YLcpDM28zLDOXrZqaTki8ct4XeEdGrfAtsZjqGSJRkqyZgxaaS15 yLLfNKA59APCG5pOLdMK6VZ9rYaHPnPhC47XJ0xg= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Ilya Leoshkevich , Vasily Gorbik , Sasha Levin Subject: [PATCH 4.9 068/171] s390/disassembler: dont hide instruction addresses Date: Thu, 2 Jan 2020 23:06:39 +0100 Message-Id: <20200102220556.286898713@linuxfoundation.org> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20200102220546.960200039@linuxfoundation.org> References: <20200102220546.960200039@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Ilya Leoshkevich [ Upstream commit 544f1d62e3e6c6e6d17a5e56f6139208acb5ff46 ] Due to kptr_restrict, JITted BPF code is now displayed like this: 000000000b6ed1b2: ebdff0800024 stmg %r13,%r15,128(%r15) 000000004cde2ba0: 41d0f040 la %r13,64(%r15) 00000000fbad41b0: a7fbffa0 aghi %r15,-96 Leaking kernel addresses to dmesg is not a concern in this case, because this happens only when JIT debugging is explicitly activated, which only root can do. Use %px in this particular instance, and also to print an instruction address in show_code and PCREL (e.g. brasl) arguments in print_insn. While at present functionally equivalent to %016lx, %px is recommended by Documentation/core-api/printk-formats.rst for such cases. Signed-off-by: Ilya Leoshkevich Reviewed-by: Vasily Gorbik Signed-off-by: Vasily Gorbik Signed-off-by: Sasha Levin --- arch/s390/kernel/dis.c | 13 +++++++------ 1 file changed, 7 insertions(+), 6 deletions(-) diff --git a/arch/s390/kernel/dis.c b/arch/s390/kernel/dis.c index aaf9dab3c193..f9dca1aed9a4 100644 --- a/arch/s390/kernel/dis.c +++ b/arch/s390/kernel/dis.c @@ -1930,10 +1930,11 @@ static int print_insn(char *buffer, unsigned char *code, unsigned long addr) ptr += sprintf(ptr, "%%c%i", value); else if (operand->flags & OPERAND_VR) ptr += sprintf(ptr, "%%v%i", value); - else if (operand->flags & OPERAND_PCREL) - ptr += sprintf(ptr, "%lx", (signed int) value - + addr); - else if (operand->flags & OPERAND_SIGNED) + else if (operand->flags & OPERAND_PCREL) { + void *pcrel = (void *)((int)value + addr); + + ptr += sprintf(ptr, "%px", pcrel); + } else if (operand->flags & OPERAND_SIGNED) ptr += sprintf(ptr, "%i", value); else ptr += sprintf(ptr, "%u", value); @@ -2005,7 +2006,7 @@ void show_code(struct pt_regs *regs) else *ptr++ = ' '; addr = regs->psw.addr + start - 32; - ptr += sprintf(ptr, "%016lx: ", addr); + ptr += sprintf(ptr, "%px: ", (void *)addr); if (start + opsize >= end) break; for (i = 0; i < opsize; i++) @@ -2033,7 +2034,7 @@ void print_fn_code(unsigned char *code, unsigned long len) opsize = insn_length(*code); if (opsize > len) break; - ptr += sprintf(ptr, "%p: ", code); + ptr += sprintf(ptr, "%px: ", code); for (i = 0; i < opsize; i++) ptr += sprintf(ptr, "%02x", code[i]); *ptr++ = '\t';