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Date: Fri, 11 Jan 2008 13:59:32 GMT
From: Jonathan Pascal <jkpyvxmzsa@mailinator.com>
To: freebsd-gnats-submit@FreeBSD.org
Subject: [ktrace] kdump segfault on linux binaries
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>Number:         119564
>Category:       kern
>Synopsis:       [ktrace] kdump segfault on linux binaries
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          closed
>Quarter:        
>Keywords:       
>Date-Required:  
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Fri Jan 11 14:10:01 UTC 2008
>Closed-Date:    Thu Nov 06 12:02:00 UTC 2008
>Last-Modified:  Sat Nov  7 21:50:04 UTC 2009
>Originator:     Jonathan Pascal
>Release:        7.0-BETA3
>Organization:
>Environment:
FreeBSD foobar 7.0-BETA3 FreeBSD 7.0-BETA3 #8: Wed Jan  9 16:19:57 CET 2008     root@foobar:/usr/obj/usr/src/sys/GENERIC  i386
>Description:
Debugging Linux binaries is a pain. strace segfaults, kdump too. This
bug report is about kdump: Using ktrace on a linux binary and viewing
the result often leads to a segfault in kdump.
>How-To-Repeat:
Steps to reproduce:
- install acroread7 from the ports
$ ktrace -i acroread
$ kdump
-> segfault

The last line before the segfault is:
 22745 bash     CALL  freebsd6_mmap(0x3,0xbfbfdf20,<invalid>672202704,MAP_SHARED|MAP_PRIVATE|MAP_RENAME|MAP_NORESERVE|MAP_HASSEMAPHORE|MAP_STACK|MAP_NOSYNC,0x2e6f732e,0x68636163,0x646165,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 [and ca. 260000 "0," following]
>Fix:


>Release-Note:
>Audit-Trail:

From: Yuri Pankov <yuri.pankov@gmail.com>
To: Jonathan Pascal <jkpyvxmzsa@mailinator.com>, bug-followup@freebsd.org
Cc: freebsd-gnats-submit@freebsd.org
Subject: Re: misc/119564: [ktrace] kdump segfault on linux binaries
Date: Fri, 11 Jan 2008 17:35:18 +0300

 It is a known problem, please use devel/linux_kdump (the fastest way to
 get it is `pkd_add -r linux_kdump`, because it requires
 linux_base-gentoo-stage3 to build).
 
 
 Yuri

State-Changed-From-To: open->closed 
State-Changed-By: gavin 
State-Changed-When: Thu Nov 6 11:58:15 UTC 2008 
State-Changed-Why:  
Jaakko Heinonen points out that this is a duplicate of bin/120055 (which 
contains a patch).  Although the devel/linux-ktrace port should be used, 
the bin/120055 patch will at least prevent ktrace from crashing. 

http://www.freebsd.org/cgi/query-pr.cgi?pr=119564 

From: dfilter@FreeBSD.ORG (dfilter service)
To: bug-followup@FreeBSD.org
Cc:  
Subject: Re: kern/119564: commit references a PR
Date: Sat,  7 Nov 2009 21:46:44 +0000 (UTC)

 Author: attilio
 Date: Sat Nov  7 21:46:34 2009
 New Revision: 199024
 URL: http://svn.freebsd.org/changeset/base/199024
 
 Log:
   Use a safety belt for cases where corrupted narg can be passed to the
   ktrsyscall(). print_number() does decrement the number of arguments,
   leading to infinite loops for negative values.
   
   Reported by:	Patrick Lamaiziere <patpr at davenulle dot org>,
   		Jonathan Pascal <jkpyvxmzsa at mailinator dot com>
   Submitted by:	jh
   PR:		bin/120055, kern/119564
   MFC:		1 week
 
 Modified:
   head/usr.bin/kdump/kdump.c
 
 Modified: head/usr.bin/kdump/kdump.c
 ==============================================================================
 --- head/usr.bin/kdump/kdump.c	Sat Nov  7 21:28:21 2009	(r199023)
 +++ head/usr.bin/kdump/kdump.c	Sat Nov  7 21:46:34 2009	(r199024)
 @@ -799,7 +799,7 @@ ktrsyscall(struct ktr_syscall *ktr)
  				narg--;
  			}
  		}
 -		while (narg) {
 +		while (narg > 0) {
  			print_number(ip,narg,c);
  		}
  		(void)putchar(')');
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>Unformatted:
