From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7B75EC36002 for ; Wed, 9 Apr 2025 20:25:59 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 3A7C92800A3; Wed, 9 Apr 2025 16:25:57 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 3558528009B; Wed, 9 Apr 2025 16:25:57 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 1F99E2800A3; Wed, 9 Apr 2025 16:25:57 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0011.hostedemail.com [216.40.44.11]) by kanga.kvack.org (Postfix) with ESMTP id F09D328009B for ; Wed, 9 Apr 2025 16:25:56 -0400 (EDT) Received: from smtpin27.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay09.hostedemail.com (Postfix) with ESMTP id 61AC88061E for ; Wed, 9 Apr 2025 20:25:58 +0000 (UTC) X-FDA: 83315636796.27.5E0CE8A Received: from smtpout2.mo533.mail-out.ovh.net (smtpout2.mo533.mail-out.ovh.net [51.210.94.139]) by imf12.hostedemail.com (Postfix) with ESMTP id CA9504000A for ; Wed, 9 Apr 2025 20:25:55 +0000 (UTC) Authentication-Results: imf12.hostedemail.com; dkim=pass header.d=jwilk.net header.s=ovhmo917968-selector1 header.b=KUpVLlNE; spf=pass (imf12.hostedemail.com: domain of jwilk@jwilk.net designates 51.210.94.139 as permitted sender) smtp.mailfrom=jwilk@jwilk.net; dmarc=none ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1744230356; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=PlSb+3ER9DX08ffcuHcb/SKT+kBQGPDkv39kOiQ23O0=; b=AHPPIk7t1Cp0oEp9UHH+W/fZHCPg1MI3xZCuIT9XmOvw+UPKJtBJ85JaGyNnIF213ulNHj 6wyBfEC735pX0U/HOX9X30UKlQ3H7B4MCRYt9i0peiJN2RouM1gRv0y7js48N+iCPjMEu0 ssERDFml/JsyQvgQ02YEW1NfT0LNXJI= ARC-Authentication-Results: i=1; imf12.hostedemail.com; dkim=pass header.d=jwilk.net header.s=ovhmo917968-selector1 header.b=KUpVLlNE; spf=pass (imf12.hostedemail.com: domain of jwilk@jwilk.net designates 51.210.94.139 as permitted sender) smtp.mailfrom=jwilk@jwilk.net; dmarc=none ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1744230356; a=rsa-sha256; cv=none; b=2gjpy/svSNf6uOCJGOIal144owqyP5JRR7cKdM//f7qwHbR6Sz92BsQ0sGLSDb7wxqJZ6V TBOR7l59SSCio/qTesJcwvK19VygUt9N/2WirrUdCWHKPYNu+Sit2nbY7Omn9pHJWtiOiH T7jyVK5vm+5a9vWlr4HPoXjQwP+3MYU= Received: from director2.derp.mail-out.ovh.net (director2.derp.mail-out.ovh.net [79.137.60.36]) by mo533.mail-out.ovh.net (Postfix) with ESMTPS id 4ZXvbP3zSGz1Tj1; Wed, 9 Apr 2025 20:25:53 +0000 (UTC) Received: from director2.derp.mail-out.ovh.net (director2.derp.mail-out.ovh.net. [127.0.0.1]) by director2.derp.mail-out.ovh.net (inspect_sender_mail_agent) with SMTP for ; Wed, 9 Apr 2025 20:25:53 +0000 (UTC) Received: from mta6.priv.ovhmail-u1.ea.mail.ovh.net (unknown [10.110.113.158]) by director2.derp.mail-out.ovh.net (Postfix) with ESMTPS id 4ZXvbP2cN0zyFY; Wed, 9 Apr 2025 20:25:53 +0000 (UTC) Received: from jwilk.net (unknown [10.1.6.7]) by mta6.priv.ovhmail-u1.ea.mail.ovh.net (Postfix) with ESMTPSA id 9F5B5D43CC9; Wed, 9 Apr 2025 20:25:51 +0000 (UTC) X-OVh-ClientIp:31.0.176.58 Date: Wed, 9 Apr 2025 22:25:48 +0200 From: Jakub Wilk To: Jann Horn Cc: Alejandro Colomar , linux-man@vger.kernel.org, Andrew Morton , "Liam R . Howlett" , Lorenzo Stoakes , Vlastimil Babka , linux-mm@kvack.org Subject: Re: [PATCH man] mmap.2: Document danger of mappings larger than PTRDIFF_MAX Message-ID: <20250409202548.unp4btmb7ktq2igk@jwilk.net> References: <20250409200316.1555164-1-jannh@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Disposition: inline In-Reply-To: <20250409200316.1555164-1-jannh@google.com> X-Ovh-Tracer-Id: 15551210988846066793 X-VR-SPAMSTATE: OK X-VR-SPAMSCORE: -100 X-VR-SPAMCAUSE: gggruggvucftvghtrhhoucdtuddrgeefvddrtddtgddvtdeileeiucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecuqfggjfdpvefjgfevmfevgfenuceurghilhhouhhtmecuhedttdenucesvcftvggtihhpihgvnhhtshculddquddttddmnecujfgurhepfffhvfevuffkfhggtggujgesthdtredttddtvdenucfhrhhomheplfgrkhhusgcuhghilhhkuceojhifihhlkhesjhifihhlkhdrnhgvtheqnecuggftrfgrthhtvghrnhepudeftefhleekkeelvddvgfeiieegffefgeejhefhgfefiedvudeujeekkeekgfffnecuffhomhgrihhnpehsohhurhgtvgifrghrvgdrohhrghenucfkphepuddvjedrtddrtddruddpfedurddtrddujeeirdehkeenucevlhhushhtvghrufhiiigvpedtnecurfgrrhgrmhepihhnvghtpeduvdejrddtrddtrddupdhmrghilhhfrhhomhepjhifihhlkhesjhifihhlkhdrnhgvthdpnhgspghrtghpthhtohepkedprhgtphhtthhopehjrghnnhhhsehgohhoghhlvgdrtghomhdprhgtphhtthhopegrlhigsehkvghrnhgvlhdrohhrghdprhgtphhtthhopehlihhnuhigqdhmmheskhhvrggtkhdrohhrghdprhgtphhtthhopegrkhhpmheslhhinhhugidqfhhouhhnuggrthhiohhnrdhorhhgpdhrtghpthhtohepnfhirghmrdfjohiflhgvthhtsehorhgrtghlvgdrtghomhdprhgtphhtthhopehlohhrvghniihordhsthhorghkvghssehorhgrtghlvg drtghomh dprhgtphhtthhopehvsggrsghkrgesshhushgvrdgtiidprhgtphhtthhopehlihhnuhigqdhmrghnsehvghgvrhdrkhgvrhhnvghlrdhorhhgpdfovfetjfhoshhtpehmohehfeefmgdpmhhouggvpehsmhhtphhouhht DKIM-Signature: a=rsa-sha256; bh=PlSb+3ER9DX08ffcuHcb/SKT+kBQGPDkv39kOiQ23O0=; c=relaxed/relaxed; d=jwilk.net; h=From; s=ovhmo917968-selector1; t=1744230354; v=1; b=KUpVLlNE/09Vt21bjO5cgh/LgRVyL2UvAic0yS0u/J4tw8rD6WUKpNHDKjsc6k0gBA0VAadP xFFuh3PN3VXGIYsTHLwqFBPkx4B4CdJh54jOYbZiLU0i+PPH39POZ8ru19ouKHzy2wCsZY8FXWi +/7TPB6dEwkWcJnSoDWRMPOmcOCKiFmL27TiFk4nd1DI1VQPSWSs8NYyyQScN/uZCe2HWVuJk1n BEh5PGdQaC+hgx4FHjN4AsqDtCkx7fEFvh1hbHE4AP8lWCv7bm1Lh023Qq44KYHWwiqZbHYLH3P N30X+69vFme1LG4zQcEKrlvbEXa008omQsmZI9h03AGYA== X-Rspamd-Queue-Id: CA9504000A X-Rspam-User: X-Rspamd-Server: rspam02 X-Stat-Signature: 8wz1pzhhrbuhwdgcg3dccxgmjupbniaz X-HE-Tag: 1744230355-236247 X-HE-Meta: U2FsdGVkX1+Ic+kOmVVWnBZ/3YM50vRLsPEkSS2H1vIfVeC1/uOrCnf75U7moZOPDNVj5/DqmOzafeOhogSmDtOS3+VlVMsqzL/YTEop0YQ96cUhgBzeBEyrBm8tJB19j1QTv1uXLniLVnDg8jiu0RkiOtVnf2hdIp2s9R1uU7B2e+S7HYp/tYXTYwVWsc2GWJAlUynjATzkYDu7XCz1yE8RvKo3rQ+2sPEvXixKTiaEW2ymOLRoSHMBzSBdcU98jaTBS/Dgmyw682UqbEUdEFgsZAnRCFkJDDVsW1aoWMYC2jjQB1nhrMgO6hEG/XrkqvChv8o4FUPcwe+KuhWH53h8YSsNUXW0P3dhgxsX72FtVahHyVQY5M5F8CxdkY4vGcSbr/YPvluCKupP3UC3W8DnSZ8NuKvE+cZptt2/yeIV2DhMSBdV7yUYZf7wRg/UzNykcTXlCdYF5TFfOT38gHBW6Nu/0xlXBKKQq+fdOQ/ZdRcj840e7AFNpswctKNWzyLPln2a89izLAjIPwOnU1KsBUQQhfNCRjuHXr/sEaJFPYtMSyY/sZCkuiZeuIHbUThgGQdEhsmovPE4QrufmA21D+an+sl/CAZkoZLkTVzqE0CPB6W++mCX5zaB1MiC48gGbQoaXnN1yhfvNdMzDqEnP0jWc2W3EjpR1k8eLVqzIvDyABmzcHnMTGrWabpohTE7KFJWr9C5TRABSJXJvTfZJTHHnobcy4kSEd4qAWpSTnp3jsv2xCdwZHxa1AMkJ4Z/ZC+sz5al19J7mIS1ZuP6i2SU+Dku1VU/jhJiAIRqR50KQjdgEAPvCyaEi2glKFY6BR4C/JeqSpK0rm2KjQX9WYzJASqC+wPh8tQonVg/2fNbtzH/XYyvmMN8aEiMyFDSb3lg7ZnBZ31QFwRbXI/2iEhslO9Qzv5330jJvkvbUtt3/zTQu9hMz4gC1IlX6MucRW9yOpakJCgBecb 0WiNSAX0 4PE4G/CHzp0w6DbaYtyiNX1BB3maIvPiAsvNICmsN54UQorrvI/1e0Rxx2IcToegXBMQoQJnoyRSI/1zlcsVLK6+2katDv12AkiY3FPS8Rig+LXyOvM1WLwuxJy4/jYyDIdHNnNb2wuXta4xVhRULVWj87qcOHrjZ1g2SoaNuTn3Zg3j1fK/I+vU0L4nFaXHiyNmM7Y02+JG15hGtRCVwt8IJIwjTSPg952ssbdh1JZqkcMIPyfZGY63Z3TKL8gfNG9zFWGWGwt+u77T81hOH24yYvwKcGXBOCHiazJPeAdw05DLmjyG8mO8VpGeDOazA4OdWrKq2MRNX4pMgPckIsWqJP2D0Xwr3gJ90jEkmF00mtabqvzXDFePuwWqyOXUZtTuAk03X6FoDt344OMcjKpJ49qBpdxQ57omww5VHx1++sMtLqugacN3gS5xdGnnNWO9abEBoA7nct/tjF6UZjv4iPHIVnxSuXRT4tJz34UY5Ivx/vWTMSc50Wvx8k/u3MEu0h8FiX99ULnjRUHCAVKB6GmnxkcimHV6wjdNK4HLn9AjDmpsyFGSYwEcAXjlC21HUHcD59WMAI7Nt7hgD1FnhAqwz+02JrLuJyQuT6Cl6zVVuvS58APzEhASsZk3thAND43WrzWjHZ6U= X-Bogosity: Ham, tests=bogofilter, spamicity=0.401803, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: * Jann Horn , 2025-04-09 22:03: > - glibc malloc restricts object size to <=PTRDIFF_MAX in > checked_request2size() FWIW, this is done only since glibc v2.30 (released in 2019): https://sourceware.org/cgit/glibc/commit/?id=9bf8e29ca136094f -- Jakub Wilk