From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 43424 invoked by alias); 17 Oct 2017 11:30:30 -0000 Mailing-List: contact gdb-help@sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: gdb-owner@sourceware.org Received: (qmail 42927 invoked by uid 89); 17 Oct 2017 11:30:20 -0000 Authentication-Results: sourceware.org; auth=none X-Virus-Found: No X-Spam-SWARE-Status: No, score=-26.9 required=5.0 tests=BAYES_00,GIT_PATCH_0,GIT_PATCH_1,GIT_PATCH_2,GIT_PATCH_3,RP_MATCHES_RCVD,SPF_HELO_PASS autolearn=ham version=3.3.2 spammy= X-HELO: mx1.redhat.com Received: from mx1.redhat.com (HELO mx1.redhat.com) (209.132.183.28) by sourceware.org (qpsmtpd/0.93/v0.84-503-g423c35a) with ESMTP; Tue, 17 Oct 2017 11:30:18 +0000 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id A4B0F883B0; Tue, 17 Oct 2017 11:30:06 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mx1.redhat.com A4B0F883B0 Authentication-Results: ext-mx02.extmail.prod.ext.phx2.redhat.com; dmarc=none (p=none dis=none) header.from=redhat.com Authentication-Results: ext-mx02.extmail.prod.ext.phx2.redhat.com; spf=fail smtp.mailfrom=palves@redhat.com Received: from [127.0.0.1] (ovpn04.gateway.prod.ext.ams2.redhat.com [10.39.146.4]) by smtp.corp.redhat.com (Postfix) with ESMTP id D3B2F60603; Tue, 17 Oct 2017 11:30:05 +0000 (UTC) Subject: Re: Heap corruption and crash reading syscall XML data To: Dmitry Antipov , gdb@sourceware.org References: <20171010091214.GC7617@waldemar-brodkorb.de> From: Pedro Alves Message-ID: Date: Tue, 17 Oct 2017 11:30:00 -0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.4.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit X-SW-Source: 2017-10/txt/msg00045.txt.bz2 On 10/17/2017 11:05 AM, Dmitry Antipov wrote: > HEAD at 0301ce1486b1450f219202677f30d0fa97335419, > > configure --prefix=/home/dantipov/.local/gdb-8.0.50 --with-python=no > --with-guile=no \ > --disable-nls --disable-binutils --disable-gprof --disable-gold > --disable-gas --disable-ld > > $ ~/.local/gdb-8.0.50/bin/gdb > GNU gdb (GDB) 8.0.50.20171017-git > Copyright (C) 2017 Free Software Foundation, Inc. > License GPLv3+: GNU GPL version 3 or later > > This is free software: you are free to change and redistribute it. > There is NO WARRANTY, to the extent permitted by law. Type "show copying" > and "show warranty" for details. > This GDB was configured as "x86_64-pc-linux-gnu". > Type "show configuration" for configuration details. > For bug reporting instructions, please see: > . > Find the GDB manual and other documentation resources online at: > . > For help, type "help". > Type "apropos word" to search for commands related to "word". > (gdb) catch syscall [TAB] I'm seeing this too. Valgrind shows: (gdb) catch syscall ==3687== Thread 1: ==3687== Invalid free() / delete / delete[] / realloc() ==3687== at 0x4C29CF0: free (vg_replace_malloc.c:530) ==3687== by 0x610862: xfree(void*) (common-utils.c:101) ==3687== by 0x440D5D: gdb::xfree_deleter::operator()(char*) const (gdb_unique_ptr.h:34) ==3687== by 0x446CC6: std::unique_ptr >::reset(char*) (unique_ptr.h:344) ==3687== by 0x81BE50: xml_fetch_content_from_file(char const*, void*) (xml-support.c:1042) ==3687== by 0x81DA86: xml_init_syscalls_info(char const*) (xml-syscall.c:366) ==3687== by 0x81DBDD: init_syscalls_info(gdbarch*) (xml-syscall.c:398) ==3687== by 0x81E131: get_syscall_by_number(gdbarch*, int, syscall*) (xml-syscall.c:599) ==3687== by 0x5BE86F: catch_syscall_command_1(char*, int, cmd_list_element*) (break-catch-syscall.c:481) ==3687== by 0x4B46B1: do_sfunc(cmd_list_element*, char*, int) (cli-decode.c:138) ==3687== by 0x4B76B8: cmd_func(cmd_list_element*, char*, int) (cli-decode.c:1952) ==3687== by 0x7E91C7: execute_command(char*, int) (top.c:615) ==3687== Address 0x14332ae0 is 0 bytes inside a block of size 4,096 free'd ==3687== at 0x4C2AB8B: realloc (vg_replace_malloc.c:785) ==3687== by 0x610792: xrealloc (common-utils.c:62) ==3687== by 0x81BE3E: xml_fetch_content_from_file(char const*, void*) (xml-support.c:1042) ==3687== by 0x81DA86: xml_init_syscalls_info(char const*) (xml-syscall.c:366) ==3687== by 0x81DBDD: init_syscalls_info(gdbarch*) (xml-syscall.c:398) ==3687== by 0x81E131: get_syscall_by_number(gdbarch*, int, syscall*) (xml-syscall.c:599) ==3687== by 0x5BE86F: catch_syscall_command_1(char*, int, cmd_list_element*) (break-catch-syscall.c:481) ==3687== by 0x4B46B1: do_sfunc(cmd_list_element*, char*, int) (cli-decode.c:138) ==3687== by 0x4B76B8: cmd_func(cmd_list_element*, char*, int) (cli-decode.c:1952) ==3687== by 0x7E91C7: execute_command(char*, int) (top.c:615) ==3687== by 0x6A422D: command_handler(char*) (event-top.c:583) ==3687== by 0x6A45F2: command_line_handler(char*) (event-top.c:773) ==3687== Block was alloc'd at ==3687== at 0x4C28BF6: malloc (vg_replace_malloc.c:299) ==3687== by 0x61073C: xmalloc (common-utils.c:44) ==3687== by 0x81BD49: xml_fetch_content_from_file(char const*, void*) (xml-support.c:1021) ==3687== by 0x81DA86: xml_init_syscalls_info(char const*) (xml-syscall.c:366) ==3687== by 0x81DBDD: init_syscalls_info(gdbarch*) (xml-syscall.c:398) ==3687== by 0x81E131: get_syscall_by_number(gdbarch*, int, syscall*) (xml-syscall.c:599) ==3687== by 0x5BE86F: catch_syscall_command_1(char*, int, cmd_list_element*) (break-catch-syscall.c:481) ==3687== by 0x4B46B1: do_sfunc(cmd_list_element*, char*, int) (cli-decode.c:138) ==3687== by 0x4B76B8: cmd_func(cmd_list_element*, char*, int) (cli-decode.c:1952) ==3687== by 0x7E91C7: execute_command(char*, int) (top.c:615) ==3687== by 0x6A422D: command_handler(char*) (event-top.c:583) ==3687== by 0x6A45F2: command_line_handler(char*) (event-top.c:773) ==3687== Catchpoint 2 (any syscall) I'm testing this fix: diff --git a/gdb/xml-support.c b/gdb/xml-support.c index 76d03b9..42a4c91 100644 --- a/gdb/xml-support.c +++ b/gdb/xml-support.c @@ -1039,7 +1039,7 @@ xml_fetch_content_from_file (const char *filename, void *baton) break; len = len * 2; - text.reset ((char *) xrealloc (text.get (), len)); + text.reset ((char *) xrealloc (text.release (), len)); } text.get ()[offset] = '\0';