From mboxrd@z Thu Jan  1 00:00:00 1970
Message-ID: <ccf33bfa3bb16eaa82d860ce725abeb4@quanstro.net>
From: erik quanstrom <quanstro@quanstro.net>
Date: Sat,  1 Aug 2009 21:38:16 -0400
To: 9fans@9fans.net
In-Reply-To: <Pine.LNX.4.64-044.0908011839420.12216@unix10.andrew.cmu.edu>
MIME-Version: 1.0
Content-Type: text/plain; charset="US-ASCII"
Content-Transfer-Encoding: 7bit
Subject: Re: [9fans] Kernel crash bug
Topicbox-Message-UUID: 352366f4-ead5-11e9-9d60-3106f5b1d025

diff -c /n/dump/2009/0801/sys/src/9/port/sysproc.c sysproc.c
/n/dump/2009/0801/sys/src/9/port/sysproc.c:234,247 - sysproc.c:234,248
  	ulong magic, text, entry, data, bss;
  	Tos *tos;

- 	validaddr(arg[0], 1, 0);
- 	file = (char*)arg[0];
+ 	file = nil;
  	indir = 0;
  	elem = nil;
  	if(waserror()){
  		free(elem);
+ 		free(file);
  		nexterror();
  	}
+ 	file = validnamedup((char*)arg[0], 1);
  	for(;;){
  		tc = namec(file, Aopen, OEXEC, 0);
  		if(waserror()){
diff -c /n/dump/2009/0801/sys/src/9/port/chan.c chan.c
/n/dump/2009/0801/sys/src/9/port/chan.c:1689,1701 - chan.c:1689,1698
  	if((ulong)name < KZERO){
  		validaddr((ulong)name, 1, 0);
  		if(!dup)
- 			print("warning: validname called from %lux with user pointer", pc);
+ 			print("warning: validname called from %#p with user pointer", pc);
  		p = name;
  		t = BY2PG-((ulong)p&(BY2PG-1));
- 		while((ename=vmemchr(p, 0, t)) == nil){
- 			p += t;
- 			t = BY2PG;
- 		}
+ 		ename = vmemchr(name, 0, 1<<16);
  	}else
  		ename = memchr(name, 0, (1<<16));