lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [day] [month] [year] [list]
Message-ID: <002c01cd3a0c$aef39530$0cdabf90$@codeaurora.org>
Date:	Thu, 24 May 2012 17:24:01 -0700
From:	"Olav Haugan" <ohaugan@...eaurora.org>
To:	"'Andrew Morton'" <akpm@...ux-foundation.org>,
	"'KyongHo'" <pullip.cho@...sung.com>
Cc:	<linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-samsung-soc@...r.kernel.org>
Subject: RE: mm: fix faulty initialization in vmalloc_init()

> -----Original Message-----
> On Thu, 24 May 2012 17:32:56 +0900
> KyongHo <pullip.cho@...sung.com> wrote:
> 
> > --- a/mm/vmalloc.c
> > +++ b/mm/vmalloc.c
> > @@ -1185,9 +1185,10 @@ void __init vmalloc_init(void)
> >  	/* Import existing vmlist entries. */
> >  	for (tmp = vmlist; tmp; tmp = tmp->next) {
> >  		va = kzalloc(sizeof(struct vmap_area), GFP_NOWAIT);
 > -		va->flags = tmp->flags | VM_VM_AREA;
> > +		va->flags = VM_VM_AREA;
> 
> This change is a mystery.  Why do we no longer transfer ->flags?

I was actually debugging the same exact issue today. This transfer of flags
actually causes some of the static mapping virtual addresses to be
prematurely freed (before the mapping is removed) because VM_LAZY_FREE gets
"set" if tmp->flags has VM_IOREMAP set. This might cause subsequent
vmalloc/ioremap calls to fail because it might allocate one of the freed
virtual address ranges that aren't unmapped. 

--
Olav Haugan

Sent by an employee of the Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ