From: "Theodore Ts'o" <tytso@mit.edu>
To: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>,
Qualys Security Advisory <qsa@qualys.com>,
Eric Sandeen <sandeen@redhat.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] mm: Make kvmalloc refuse to allocate more than 2GB
Date: Thu, 22 Jul 2021 10:43:44 -0400 [thread overview]
Message-ID: <YPmEIAQWUD4i/aPR@mit.edu> (raw)
In-Reply-To: <20210721184131.2264356-1-willy@infradead.org>
On Wed, Jul 21, 2021 at 07:41:31PM +0100, Matthew Wilcox (Oracle) wrote:
> It's generally dangerous to allocate such large quantities of memory
> within the kernel owing to our propensity to use 'int' to represent
> a length. If somebody really needs it, we can add a kvmalloc_large()
> later, but let's default to "You can't allocate that much memory".
If we really need it, maybe we can add a GFP_LARGE_ALLOC to allow
allocations larger than 2GB later on? I can't quite see why that
would ever be needed, but that's probably a failure of my imagination. :-)
- Ted
next prev parent reply other threads:[~2021-07-22 14:44 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-21 18:41 [PATCH] mm: Make kvmalloc refuse to allocate more than 2GB Matthew Wilcox (Oracle)
2021-07-21 20:46 ` Linus Torvalds
2021-07-21 20:46 ` Linus Torvalds
2021-07-22 0:14 ` Matthew Wilcox
2021-07-22 14:43 ` Theodore Ts'o [this message]
2021-07-27 7:38 ` Michal Hocko
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