linux-kernel - Re: [PATCH RFC v2 2/4] mm: Add hint and mmap_flags to struct vm_unmapped_area

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] [thread-next>] [day] [month] [year] [list]

Message-ID: <ZtEcNfNMfNTzkHEF@ghost>
Date: Thu, 29 Aug 2024 18:11:17 -0700
From: Charlie Jenkins <charlie@...osinc.com>
To: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
Cc: Arnd Bergmann <arnd@...db.de>,
	Richard Henderson <richard.henderson@...aro.org>,
	Ivan Kokshaysky <ink@...assic.park.msu.ru>,
	Matt Turner <mattst88@...il.com>, Vineet Gupta <vgupta@...nel.org>,
	Russell King <linux@...linux.org.uk>, Guo Ren <guoren@...nel.org>,
	Huacai Chen <chenhuacai@...nel.org>,
	WANG Xuerui <kernel@...0n.name>,
	Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
	"James E.J. Bottomley" <James.Bottomley@...senpartnership.com>,
	Helge Deller <deller@....de>, Michael Ellerman <mpe@...erman.id.au>,
	Nicholas Piggin <npiggin@...il.com>,
	Christophe Leroy <christophe.leroy@...roup.eu>,
	Naveen N Rao <naveen@...nel.org>,
	Alexander Gordeev <agordeev@...ux.ibm.com>,
	Gerald Schaefer <gerald.schaefer@...ux.ibm.com>,
	Heiko Carstens <hca@...ux.ibm.com>,
	Vasily Gorbik <gor@...ux.ibm.com>,
	Christian Borntraeger <borntraeger@...ux.ibm.com>,
	Sven Schnelle <svens@...ux.ibm.com>,
	Yoshinori Sato <ysato@...rs.sourceforge.jp>,
	Rich Felker <dalias@...c.org>,
	John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>,
	"David S. Miller" <davem@...emloft.net>,
	Andreas Larsson <andreas@...sler.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
	"H. Peter Anvin" <hpa@...or.com>, Andy Lutomirski <luto@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Muchun Song <muchun.song@...ux.dev>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Liam R. Howlett" <Liam.Howlett@...cle.com>,
	Vlastimil Babka <vbabka@...e.cz>, Shuah Khan <shuah@...nel.org>,
	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-alpha@...r.kernel.org, linux-snps-arc@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org, linux-csky@...r.kernel.org,
	loongarch@...ts.linux.dev, linux-mips@...r.kernel.org,
	linux-parisc@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
	linux-s390@...r.kernel.org, linux-sh@...r.kernel.org,
	sparclinux@...r.kernel.org, linux-mm@...ck.org,
	linux-kselftest@...r.kernel.org
Subject: Re: [PATCH RFC v2 2/4] mm: Add hint and mmap_flags to struct
 vm_unmapped_area_info

On Thu, Aug 29, 2024 at 09:48:44AM +0100, Lorenzo Stoakes wrote:
> On Thu, Aug 29, 2024 at 12:15:59AM GMT, Charlie Jenkins wrote:
> 
> [snip]
> 
> > diff --git a/mm/mmap.c b/mm/mmap.c
> > index d0dfc85b209b..34ba0db23678 100644
> > --- a/mm/mmap.c
> > +++ b/mm/mmap.c
> > @@ -1796,6 +1796,9 @@ generic_get_unmapped_area(struct file *filp, unsigned long addr,
> >  	struct vm_unmapped_area_info info = {};
> >  	const unsigned long mmap_end = arch_get_mmap_end(addr, len, flags);
> >
> > +	info.hint = addr;
> > +	info.mmap_flags = flags;
> > +
> >  	if (len > mmap_end - mmap_min_addr)
> >  		return -ENOMEM;
> >
> > @@ -1841,6 +1844,9 @@ generic_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
> >  	struct vm_unmapped_area_info info = {};
> >  	const unsigned long mmap_end = arch_get_mmap_end(addr, len, flags);
> >
> > +	info.hint = addr;
> > +	info.mmap_flags = flags;
> > +
> >  	/* requested length too big for entire address space */
> >  	if (len > mmap_end - mmap_min_addr)
> >  		return -ENOMEM;
> >
> 
> These line numbers suggest you're working against Linus's tree, mm/mmap.c
> has changed a lot recently, so to avoid conflicts please base your changes
> on mm-unstable in Andrew's tree (if looking to go through that) or at least
> -next.

I will make sure that I base off of mm-unstable for future revisions.

- Charlie

> 
> > --
> > 2.45.0
> >