From: Will Deacon <will@kernel.org>
To: Dmitry Safonov <dima@arista.com>
Cc: linux-kernel@vger.kernel.org,
Dmitry Safonov <0x7f454c46@gmail.com>,
Alexander Viro <viro@zeniv.linux.org.uk>,
Andrew Morton <akpm@linux-foundation.org>,
Andy Lutomirski <luto@kernel.org>,
Brian Geffon <bgeffon@google.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Dan Williams <dan.j.williams@intel.com>,
Dave Jiang <dave.jiang@intel.com>,
Hugh Dickins <hughd@google.com>, Ingo Molnar <mingo@redhat.com>,
"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
Mike Kravetz <mike.kravetz@oracle.com>,
Minchan Kim <minchan@kernel.org>,
Russell King <linux@armlinux.org.uk>,
Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
Thomas Gleixner <tglx@linutronix.de>,
Vishal Verma <vishal.l.verma@intel.com>,
Vlastimil Babka <vbabka@suse.cz>,
linux-aio@kvack.org, linux-fsdevel@vger.kernel.org,
linux-mm@kvack.org
Subject: Re: [PATCH 6/6] mm: Forbid splitting special mappings
Date: Fri, 22 Jan 2021 13:00:04 +0000 [thread overview]
Message-ID: <20210122130003.GD24102@willie-the-truck> (raw)
In-Reply-To: <20210122125858.GC24102@willie-the-truck>
On Fri, Jan 22, 2021 at 12:58:58PM +0000, Will Deacon wrote:
> On Tue, Oct 13, 2020 at 02:34:16AM +0100, Dmitry Safonov wrote:
> > Don't allow splitting of vm_special_mapping's.
> > It affects vdso/vvar areas. Uprobes have only one page in xol_area so
> > they aren't affected.
> >
> > Those restrictions were enforced by checks in .mremap() callbacks.
> > Restrict resizing with generic .split() callback.
> >
> > Signed-off-by: Dmitry Safonov <dima@arista.com>
> > ---
> > arch/arm/kernel/vdso.c | 9 ---------
> > arch/arm64/kernel/vdso.c | 41 +++------------------------------------
> > arch/mips/vdso/genvdso.c | 4 ----
> > arch/s390/kernel/vdso.c | 11 +----------
> > arch/x86/entry/vdso/vma.c | 17 ----------------
> > mm/mmap.c | 12 ++++++++++++
> > 6 files changed, 16 insertions(+), 78 deletions(-)
>
> For arm64:
>
> Acked-by: Will Deacon <will@kernel.org>
Wait -- this got merged ages ago! Why am I reading such old email?
Will
next prev parent reply other threads:[~2021-01-22 13:00 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-13 1:34 [PATCH 0/6] mremap: move_vma() fixes Dmitry Safonov
2020-10-13 1:34 ` [PATCH 1/6] mm/mremap: Account memory on do_munmap() failure Dmitry Safonov
2020-10-13 1:34 ` [PATCH 2/6] mm/mremap: For MREMAP_DONTUNMAP check security_vm_enough_memory_mm() Dmitry Safonov
2020-12-28 18:21 ` Brian Geffon
2020-12-28 19:12 ` Dmitry Safonov
2020-12-30 15:43 ` Brian Geffon
2020-10-13 1:34 ` [PATCH 3/6] mremap: Don't allow MREMAP_DONTUNMAP on special_mappings and aio Dmitry Safonov
2020-12-28 18:03 ` Brian Geffon
2020-12-28 19:33 ` Dmitry Safonov
2020-12-28 19:43 ` Dmitry Safonov
2020-10-13 1:34 ` [PATCH 4/6] vm_ops: Rename .split() callback to .may_split() Dmitry Safonov
2020-10-13 1:34 ` [PATCH 5/6] mremap: Check if it's possible to split original vma Dmitry Safonov
2020-10-13 1:34 ` [PATCH 6/6] mm: Forbid splitting special mappings Dmitry Safonov
2021-01-22 12:58 ` Will Deacon
2021-01-22 13:00 ` Will Deacon [this message]
2021-01-22 19:52 ` Dmitry Safonov
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