From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4856329B8E8 for ; Mon, 9 Feb 2026 08:06:12 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770624372; cv=none; b=fFzfFwqTbJ4wJNnMsV3Xng4hh/ZXZviKbEAS5XjvbulAassJZxLEltOQaBD08m0TBoIGd14sAOLoO1NaAafcV7jCCtjoJ/7Sf5KVPT0uQA7s787GH0fJ5BC0Zye1AW1v2j2HjNP2l/y75gz3Wi27qaecZxWAfeVfLhNyfVY1vNY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770624372; c=relaxed/simple; bh=SzUJ17uIjUXWqMNjh2fsfaFW+MRAmFwhSaZyTibNZYk=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=dsQbGrPuaxvheZeqrt40UOKsX5NHAOF2Jy+Ed1UCYRlPebNE8wx/rr01wWL1kFb7mHgM2ocu2dqeqyKDMAbXAQcab9u/9U20oewIZTNEENNC8Q/SIhzbhOXgyxpfrpHGmc9QwXJHDc3lfTPz8cap6Exzs9NvBA5SL8XKzEGiAY8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=eM1R+TVu; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="eM1R+TVu" Received: by smtp.kernel.org (Postfix) with ESMTPSA id CEBB2C116C6; Mon, 9 Feb 2026 08:06:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1770624371; bh=SzUJ17uIjUXWqMNjh2fsfaFW+MRAmFwhSaZyTibNZYk=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=eM1R+TVuODddEFR9CmmJJyGTyy0/KNJj3yq1ovylzoVIG2ViR5LDrCuOD5hGJS61A fg0E1/36evcKGBeYQ/2JIx8H4z3FxdQijDYoodBHb9QUGuFHdFuMgUgO+zl/hix3EA mqG7LfgybHymjL5PQqSI7B4N74MY7s3jp0tOqIsBvF2P6fD99ps9kBKb1mM6Qj2FOc NWToEw6xue9D47yKe9/QfC8K8yNHeMKoJ0boL1OVG8e0f3uRMuxIWmMlnAh7T+AOXV uUZxFvZOhEQa28vaXb3pjlBF4AEjPgmNtB84kw2jmH1YSU7664P+pkzy8iQMDF3YdH trQlWq2EFuPQg== Message-ID: <64fa130c-a87a-4c73-a2af-ff52c9268588@kernel.org> Date: Mon, 9 Feb 2026 09:06:06 +0100 Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2] mm/fadvise: validate offset in generic_fadvise To: klourencodev@gmail.com, linux-mm@kvack.org Cc: jack@suse.cz, rppt@kernel.org, akpm@linux-foundation.org, vbabka@suse.cz, brauner@kernel.org, linux-fsdevel@vger.kernel.org References: <20260208135738.18992-1-klourencodev@gmail.com> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 2/8/26 14:57, klourencodev@gmail.com wrote: > From: Kevin Lourenco > > When converted to (u64) for page calculations, a negative offset can > produce extremely large page indices. This may lead to issues in certain > advice modes (excessive readahead or cache invalidation). > > Reject negative offsets with -EINVAL for consistent argument validation > and to avoid silent misbehavior. > > POSIX and the man page do not clearly define behavior for negative > offset/len. FreeBSD rejects negative offsets as well, so failing with > -EINVAL is consistent with existing practice. The man page can be > updated separately to document the Linux behavior. > > Signed-off-by: Kevin Lourenco > --- Acked-by: David Hildenbrand (Arm) -- Cheers, David