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Mon, 25 Aug 2025 13:01:00 -0700 (PDT) Received: from [192.168.0.241] ([198.48.244.52]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-70da7145f0csm52455666d6.9.2025.08.25.13.00.59 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 25 Aug 2025 13:00:59 -0700 (PDT) Message-ID: Date: Mon, 25 Aug 2025 16:00:58 -0400 Precedence: bulk X-Mailing-List: linux-man@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: Issue in man page PR_SET_SECUREBITS.2const To: Alejandro Colomar Cc: Helge Kreutzmann , mario.blaettermann@gmail.com, linux-man@vger.kernel.org References: <8ed88109-2dd4-4d26-ba5d-32bbf7cb2906@redhat.com> From: Carlos O'Donell Content-Language: en-US Autocrypt: addr=carlos@redhat.com; keydata= xsFNBFef5BoBEACvJ15QMMZh4stKHbz0rs78XsOdxuug37dumTx6ngrDCwZ61k7nHQ+uxLuo QvLSc6YJGBEfiNFbs1hvhRFNR7xJbzRYmin7kJZZ/06fH2cgTkQhN0mRBP8KsKKT+7SvvBL7 85ZfAhArWf5m5Tl0CktZ8yoG8g9dM4SgdvdSdzZUaWBVHc6TjdAb9YEQ1/jpyfHsQp+PWLuQ ZI8nZUm+I3IBDLkbbuJVQklKzpT1b8yxVSsHCyIPFRqDDUjPL5G4WnUVy529OzfrciBvHdxG sYYDV8FX7fv6V/S3eL6qmZbObivIbLD2NbeDqw6vNpr+aehEwgwNbMVuVfH1PVHJV8Qkgxg4 PqPgQC7GbIhxxYroGbLJCQ41j25M+oqCO/XW/FUu/9x0vY5w0RsZFhlmSP5lBDcaiy3SUgp3 MSTePGuxpPlLVMePxKvabSS7EErLKlrAEmDgnUYYdPqGCefA+5N9Rn2JPfP7SoQEp2pHhEyM 6Xg9x7TJ+JNuDowQCgwussmeDt2ZUeMl3s1f6/XePfTd3l8c8Yn5Fc8reRa28dFANU6oXiZf 7/h3iQXPg81BsLMJK3aA/nyajRrNxL8dHIx7BjKX0/gxpOozlUHZHl73KhAvrBRaqLrr2tIP LkKrf3d7wdz4llg4NAGIU4ERdTTne1QAwS6x2tNa9GO9tXGPawARAQABzSpDYXJsb3MgTydE b25lbGwgKFdvcmspIDxjYXJsb3NAcmVkaGF0LmNvbT7CwZUEEwEIAD8CGwMGCwkIBwMCBhUI AgkKCwQWAgMBAh4BAheAFiEEcnNUKzmWLfeymZMUFnkrTqJTQPgFAmiCl2sFCRLD5s0ACgkQ FnkrTqJTQPjADA/9EtX1AuwVtpdGqaAqaW3lrOPSqJk5NiI3LiZQFpgVOrMs9VF1BEOGpv2h Cy54VjgUGYX4YnnoocC9FCmUkVqUPPkNJr3iElNJF3oAU/MtLCZCDxeJQY8vRRh4idpc61CO EnE4bl7nFnPiK1YzZhN1nvdIqvKXkzfFPdHUyejoFso3qX1eMfBf7GciPwT9gjIDovUwHN6n 0qsYPxl/eFKleN2hPLDfrucfs/398zAbL5N0EVwrmtG4OZeV6SyN6HiSy7knLW9bg7TMvN8P vvEAJ5CbpgEW90JMGAqb10VAjs2vZehXh+gEqVSAfEjT6rVWZBzUzYCl89eaN+usMDIi7NN0 CqIVv6NKH0dIswYC8J5hPeeV2q52d2s1g8NzJHL/3s7Hc+ot10DsOeoJA2bXhuH3LCveQHzs 7Pi0Pm9olLEVVfoo0E2K+oYzb1t1qHBPiR9zcccW7sCFZhDjVtBbFdXXp+bQ+3tqiveMttUB NPKl5AFDoa/0Uc2L7piGQ0fqUaHT24BmOGmlEUUWueqFbln0033t1L02i8lPAMo4Fu1k1akP 3s0x/e/TOaKY9qJb7h5rFe130HrNQS2TzOSKCjaKmCvRxlDRz8xYdVnEmlTvIeG38apgTNJ+ moD6aE3qj81BqD1LaR7Dfw07F1TPKbtzswaB+al/iWsK8uOl6P7OwU0EV5/kGgEQAKvTJke+ QSjATmz11ALKle/SSEpUwL5QOpt3xomEATcYAamww0HADfGTKdUR+aWgOK3vqu6Sicr1zbuZ jHCs2GaIgRoqh1HKVgCmaJYjizvidHluqrox6qqc9PG0bWb0f5xGQw+X2z+bEinzv4qaep1G 1OuYgvG49OpHTgZMiJq9ncHCxkD2VEJKgMywGJ4Agdl+NWVn0T7w6J+/5QmBIE8hh4NzpYfr xzWCJ9iZ3skG4zBGB4YEacc3+oeEoybc10h6tqhQNrtIiSRJH+SUJvOiNH8oMXPLAjfFVy3d 4BOgyxJhE0UhmQIQHMJxCBw81fQD10d0dcru0rAIEldEpt2UXqOr0rOALDievMF/2BKQiOA7 PbMC3/dwuNHDlClQzdjil8O7UsIgf3IMFaIbQoUEvjlgf5cm9a94gWABcfI1xadAq9vcIB5v +9fM71xDgdELnZThTd8LByrG99ExVMcG2PZYXJllVDQDZqYA1PjD9e0yHq5whJi3BrZgwDaL 5vYZEb1EMyH+BQLO3Zw/Caj8W6mooGHgNveRQ1g9FYn3NUp7UvS22Zt/KW4pCpbgkQZefxup KO6QVNwwggV44cTQ37z5onGbNPD8+2k2mmC0OEtGBkj+VH39tRk+uLOcuXlGNSVk3xOyxni0 Nk9M0GvTvPKoah9gkvL/+AofN/31ABEBAAHCwXwEGAEIACYCGwwWIQRyc1QrOZYt97KZkxQW eStOolNA+AUCaIKXfAUJEsPm4gAKCRAWeStOolNA+B0WEACEIb+2+irwJzvzwVKha7oB5Dub GCvnHLvvXShYDoHzvajTnLTULWAepp05NiAxI8cP9QNpmj8PPzh1eJ4A53vXogWftATT9N7V WEAqVLo3wYAILfnzIOxr5qro148eY++pLMVxHhqrbol4D0CBG+WSAUZdAhK3hKeuA91sUjGa iSpwnihXhegHzeFcRgyaC+NhQsj8EoUpdSQtlmea5FxcV0jxiAdPS/8TvBsalMHNQTqOBr+Q eyGauXNrS3wT7qVbwNRVdRPHC61qR6RH1TPHAPorZ5p/XQisuxyLXDOJZR0yCsxvqoRWDTJu fb8xLrfLxy/LqtE5JNzG1OJL1Bbu9wwiXTkTyj82Zg1KmrDSdSZUvGa3Q7kk5dG38Iel8LEF a/Ri/cYKhk7XjJ8xHBMB6KCJueItjyv2qG7vokhxm8ep0XQNVR+rIKVJH60TKIKonLXNYfK/ znfxUttwFIjjLso6WPHxRjPr1ot1AbgDbuFspRbG7mR2H20ZLjgLPWWAsiHfjyktQ7Dk0hjv r0uSJR1R7X5Cdh3uJCl02Rp1jTZNBDWGVdxA8MSY1ej0yOO+VI8OukA75K0u72wvJD4Dg+Sq 6mzR3XVZmF7FAZNTSV+1GCekJlnCSp4M8HItrojuEtrdH8Ba4WWxK+cIKejqzhwKFpQYBLg9 m/A+1AHg4g== Organization: Red Hat In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit On 8/25/25 3:41 PM, Alejandro Colomar wrote: > Hi Carlos, > > On Mon, Aug 25, 2025 at 01:52:03PM -0400, Carlos O'Donell wrote: >> On 8/24/25 3:21 PM, Alejandro Colomar wrote: >>> Hi Helge, >>> >>>> Subject: Re: Issue in man page PR_SET_SECUREBITS.2const >>> >>> You probably meant PR_SET_THP_DISABLE.2const. The text you quoted is >>> there: >>> >>> $ grep -rn THP.disable >>> man/man2const/PR_SET_THP_DISABLE.2const:9:set the state of the "THP disable" flag for the calling thread >>> man/man2const/PR_SET_THP_DISABLE.2const:21:Set the state of the "THP disable" flag for the calling thread. >>> man/man2const/PR_SET_THP_DISABLE.2const:32:The setting of the "THP disable" flag is inherited by a child created via >>> man/man2const/PR_GET_THP_DISABLE.2const:9:get the state of the "THP disable" flag for the calling thread >>> man/man2const/PR_GET_THP_DISABLE.2const:22:the "THP disable" flag for the calling thread: >>> >>> On Sun, Aug 24, 2025 at 02:48:48PM +0000, Helge Kreutzmann wrote: >>>> Without further ado, the following was found: >>>> >>>> Issue: malloc → B(3) ? >>> >>> Maybe, but we should probably add a reference to malloc_hook(3) instead? >> >> In a modern system you care about malloc not malloc_hook. >> >> The hooks have been removed and glibc has directly integrated THP usage in malloc instead. >> >> https://sourceware.org/glibc/manual/2.42/html_node/Memory-Allocation-Tunables.html > > Thanks! Do we need a more thorough rewrite of this page is needed? > Or just replace malloc by malloc(3)? Yes, the existing text is only correct for < 2.34 glibc system. A > 2.34 system has THP support with the tunable to support THP (for legacy libhugetlbfs users). And a glibc == 2.34 system lacks this feature and doesn't support such hook + interposer deployments. The quickest fix is to reference malloc(3) for now. -- Cheers, Carlos.