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Thu, 28 Aug 2025 14:31:13 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id P2zKGDFosGhuIwAAD6G6ig (envelope-from ); Thu, 28 Aug 2025 14:31:13 +0000 Message-ID: <8d536d53-a365-4a9f-8d30-bbade9a85e3e@suse.cz> Date: Thu, 28 Aug 2025 16:31:13 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] mm/mremap: fix regression in vrm->new_addr check Content-Language: en-US To: Carlos Llamas , Lorenzo Stoakes Cc: Andrew Morton , "Liam R. Howlett" , Jann Horn , Pedro Falcato , kernel-team@android.com, linux-kernel@vger.kernel.org, "open list:MEMORY MAPPING" References: <20250828032653.521314-1-cmllamas@google.com> <8a4dc910-5237-48aa-8abb-a6d5044bc290@lucifer.local> <53b938ed-dd78-42fa-8cde-f3a938b6f39f@suse.cz> From: Vlastimil Babka Autocrypt: addr=vbabka@suse.cz; keydata= xsFNBFZdmxYBEADsw/SiUSjB0dM+vSh95UkgcHjzEVBlby/Fg+g42O7LAEkCYXi/vvq31JTB KxRWDHX0R2tgpFDXHnzZcQywawu8eSq0LxzxFNYMvtB7sV1pxYwej2qx9B75qW2plBs+7+YB 87tMFA+u+L4Z5xAzIimfLD5EKC56kJ1CsXlM8S/LHcmdD9Ctkn3trYDNnat0eoAcfPIP2OZ+ 9oe9IF/R28zmh0ifLXyJQQz5ofdj4bPf8ecEW0rhcqHfTD8k4yK0xxt3xW+6Exqp9n9bydiy tcSAw/TahjW6yrA+6JhSBv1v2tIm+itQc073zjSX8OFL51qQVzRFr7H2UQG33lw2QrvHRXqD Ot7ViKam7v0Ho9wEWiQOOZlHItOOXFphWb2yq3nzrKe45oWoSgkxKb97MVsQ+q2SYjJRBBH4 8qKhphADYxkIP6yut/eaj9ImvRUZZRi0DTc8xfnvHGTjKbJzC2xpFcY0DQbZzuwsIZ8OPJCc LM4S7mT25NE5kUTG/TKQCk922vRdGVMoLA7dIQrgXnRXtyT61sg8PG4wcfOnuWf8577aXP1x 6mzw3/jh3F+oSBHb/GcLC7mvWreJifUL2gEdssGfXhGWBo6zLS3qhgtwjay0Jl+kza1lo+Cv BB2T79D4WGdDuVa4eOrQ02TxqGN7G0Biz5ZLRSFzQSQwLn8fbwARAQABzSBWbGFzdGltaWwg QmFia2EgPHZiYWJrYUBzdXNlLmN6PsLBlAQTAQoAPgIbAwULCQgHAwUVCgkICwUWAgMBAAIe AQIXgBYhBKlA1DSZLC6OmRA9UCJPp+fMgqZkBQJnyBr8BQka0IFQAAoJECJPp+fMgqZkqmMQ AIbGN95ptUMUvo6aAdhxaOCHXp1DfIBuIOK/zpx8ylY4pOwu3GRe4dQ8u4XS9gaZ96Gj4bC+ jwWcSmn+TjtKW3rH1dRKopvC07tSJIGGVyw7ieV/5cbFffA8NL0ILowzVg8w1ipnz1VTkWDr 2zcfslxJsJ6vhXw5/npcY0ldeC1E8f6UUoa4eyoskd70vO0wOAoGd02ZkJoox3F5ODM0kjHu Y97VLOa3GG66lh+ZEelVZEujHfKceCw9G3PMvEzyLFbXvSOigZQMdKzQ8D/OChwqig8wFBmV QCPS4yDdmZP3oeDHRjJ9jvMUKoYODiNKsl2F+xXwyRM2qoKRqFlhCn4usVd1+wmv9iLV8nPs 2Db1ZIa49fJet3Sk3PN4bV1rAPuWvtbuTBN39Q/6MgkLTYHb84HyFKw14Rqe5YorrBLbF3rl M51Dpf6Egu1yTJDHCTEwePWug4XI11FT8lK0LNnHNpbhTCYRjX73iWOnFraJNcURld1jL1nV r/LRD+/e2gNtSTPK0Qkon6HcOBZnxRoqtazTU6YQRmGlT0v+rukj/cn5sToYibWLn+RoV1CE Qj6tApOiHBkpEsCzHGu+iDQ1WT0Idtdynst738f/uCeCMkdRu4WMZjteQaqvARFwCy3P/jpK uvzMtves5HvZw33ZwOtMCgbpce00DaET4y/UzsBNBFsZNTUBCACfQfpSsWJZyi+SHoRdVyX5 J6rI7okc4+b571a7RXD5UhS9dlVRVVAtrU9ANSLqPTQKGVxHrqD39XSw8hxK61pw8p90pg4G /N3iuWEvyt+t0SxDDkClnGsDyRhlUyEWYFEoBrrCizbmahOUwqkJbNMfzj5Y7n7OIJOxNRkB IBOjPdF26dMP69BwePQao1M8Acrrex9sAHYjQGyVmReRjVEtv9iG4DoTsnIR3amKVk6si4Ea X/mrapJqSCcBUVYUFH8M7bsm4CSxier5ofy8jTEa/CfvkqpKThTMCQPNZKY7hke5qEq1CBk2 wxhX48ZrJEFf1v3NuV3OimgsF2odzieNABEBAAHCwXwEGAEKACYCGwwWIQSpQNQ0mSwujpkQ PVAiT6fnzIKmZAUCZ8gcVAUJFhTonwAKCRAiT6fnzIKmZLY8D/9uo3Ut9yi2YCuASWxr7QQZ lJCViArjymbxYB5NdOeC50/0gnhK4pgdHlE2MdwF6o34x7TPFGpjNFvycZqccSQPJ/gibwNA zx3q9vJT4Vw+YbiyS53iSBLXMweeVV1Jd9IjAoL+EqB0cbxoFXvnjkvP1foiiF5r73jCd4PR rD+GoX5BZ7AZmFYmuJYBm28STM2NA6LhT0X+2su16f/HtummENKcMwom0hNu3MBNPUOrujtW khQrWcJNAAsy4yMoJ2Lw51T/5X5Hc7jQ9da9fyqu+phqlVtn70qpPvgWy4HRhr25fCAEXZDp xG4RNmTm+pqorHOqhBkI7wA7P/nyPo7ZEc3L+ZkQ37u0nlOyrjbNUniPGxPxv1imVq8IyycG AN5FaFxtiELK22gvudghLJaDiRBhn8/AhXc642/Z/yIpizE2xG4KU4AXzb6C+o7LX/WmmsWP Ly6jamSg6tvrdo4/e87lUedEqCtrp2o1xpn5zongf6cQkaLZKQcBQnPmgHO5OG8+50u88D9I rywqgzTUhHFKKF6/9L/lYtrNcHU8Z6Y4Ju/MLUiNYkmtrGIMnkjKCiRqlRrZE/v5YFHbayRD dJKXobXTtCBYpLJM4ZYRpGZXne/FAtWNe4KbNJJqxMvrTOrnIatPj8NhBVI0RSJRsbilh6TE m6M14QORSWTLRg== In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Action: no action X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 943A28000E X-Stat-Signature: aj93zpo58x8b9iuahmzjyd9is3h4a61z X-Rspam-User: X-HE-Tag: 1756391475-442457 X-HE-Meta: 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 8/28/25 16:29, Carlos Llamas wrote: > On Thu, Aug 28, 2025 at 03:22:54PM +0100, Lorenzo Stoakes wrote: >> On Thu, Aug 28, 2025 at 04:21:05PM +0200, Vlastimil Babka wrote: >> > On 8/28/25 07:38, Lorenzo Stoakes wrote: >> > > On Thu, Aug 28, 2025 at 03:26:52AM +0000, Carlos Llamas wrote: >> > >> Commit 3215eaceca87 ("mm/mremap: refactor initial parameter sanity >> > >> checks") moved the sanity check for vrm->new_addr from mremap_to() to >> > >> check_mremap_params(). >> > >> >> > >> However, this caused a regression as vrm->new_addr is now checked even >> > >> when MREMAP_FIXED and MREMAP_DONTUNMAP flags are not specified. In this >> > >> case, vrm->new_addr can be garbage and create unexpected failures. >> > > >> > > Yikes, sorry my mistake. >> > > >> > >> >> > >> Fix this by moving the new_addr check after the vrm_implies_new_addr() >> > >> guard. This ensures that the new_addr is only checked when the user has >> > >> specified one explicitly. >> > >> >> > >> Fixes: 3215eaceca87 ("mm/mremap: refactor initial parameter sanity checks") >> > >> Signed-off-by: Carlos Llamas >> > > >> > > You need a Cc: Stable. >> > >> > No need as the commit being fixed is from 6.17-rc1? >> > But it's better to use "[PATCH mm-hotfixes]" to make sure it goes to 6.17 >> > and not the next merge window. >> > >> >> Ah haha really? I'm losing track of my patches. >> >> Yeah sure as per Vlasta then Carlos :) > > Oops, sorry my v2 raced with this. Nevermind, Andrew can fixup locally. Thanks :)