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Thu, 09 Jan 2025 09:01:16 -0800 (PST) Received: from [10.67.48.245] ([192.19.223.252]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-2f559439ae4sm1818136a91.30.2025.01.09.09.01.15 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 09 Jan 2025 09:01:15 -0800 (PST) Message-ID: <62786457-d4a1-4861-8bec-7e478626f4db@broadcom.com> Date: Thu, 9 Jan 2025 09:01:13 -0800 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] arm64: mm: account for hotplug memory when randomizing the linear region To: stable@vger.kernel.org Cc: Ard Biesheuvel , Anshuman Khandual , Will Deacon , Steven Price , Robin Murphy , Catalin Marinas , Baruch Siach , Petr Tesarik , Mark Rutland , Joey Gouly , "Mike Rapoport (IBM)" , Yang Shi , "moderated list:ARM64 PORT (AARCH64 ARCHITECTURE)" , open list References: <20250109165419.1623683-1-florian.fainelli@broadcom.com> <20250109165419.1623683-2-florian.fainelli@broadcom.com> Content-Language: en-US From: Florian Fainelli Autocrypt: addr=florian.fainelli@broadcom.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 1/9/25 08:54, Florian Fainelli wrote: > From: Ard Biesheuvel > > commit 97d6786e0669daa5c2f2d07a057f574e849dfd3e upstream > > As a hardening measure, we currently randomize the placement of > physical memory inside the linear region when KASLR is in effect. > Since the random offset at which to place the available physical > memory inside the linear region is chosen early at boot, it is > based on the memblock description of memory, which does not cover > hotplug memory. The consequence of this is that the randomization > offset may be chosen such that any hotplugged memory located above > memblock_end_of_DRAM() that appears later is pushed off the end of > the linear region, where it cannot be accessed. > > So let's limit this randomization of the linear region to ensure > that this can no longer happen, by using the CPU's addressable PA > range instead. As it is guaranteed that no hotpluggable memory will > appear that falls outside of that range, we can safely put this PA > range sized window anywhere in the linear region. > > Signed-off-by: Ard Biesheuvel > Cc: Anshuman Khandual > Cc: Will Deacon > Cc: Steven Price > Cc: Robin Murphy > Link: https://lore.kernel.org/r/20201014081857.3288-1-ardb@kernel.org > Signed-off-by: Catalin Marinas > Signed-off-by: Florian Fainelli Forgot to update the patch subject, but this one is for 5.10. -- Florian