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(p200300d82f372b00948cdd9f29c873f4.dip0.t-ipconnect.de. [2003:d8:2f37:2b00:948c:dd9f:29c8:73f4]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-45b6f0c6dc1sm239218725e9.1.2025.09.01.06.24.59 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 01 Sep 2025 06:25:00 -0700 (PDT) Message-ID: <94ec640b-76cd-478e-9ee7-ff8597d1fafc@redhat.com> Date: Mon, 1 Sep 2025 15:24:59 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 1/4] copy_sighand: Handle architectures where sizeof(unsigned long) < sizeof(u64) To: schuster.simon@siemens-energy.com, Dinh Nguyen , Christian Brauner , Arnd Bergmann , Andrew Morton , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org, linux-csky@vger.kernel.org, linux-block@vger.kernel.org, linux-fsdevel@vger.kernel.org, cgroups@vger.kernel.org, linux-security-module@vger.kernel.org, linux-trace-kernel@vger.kernel.org, netdev@vger.kernel.org, linux-perf-users@vger.kernel.org, apparmor@lists.ubuntu.com, selinux@vger.kernel.org, linux-alpha@vger.kernel.org, linux-snps-arc@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-hexagon@vger.kernel.org, loongarch@lists.linux.dev, linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org, linux-openrisc@vger.kernel.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-um@lists.infradead.org, stable@vger.kernel.org References: <20250901-nios2-implement-clone3-v2-0-53fcf5577d57@siemens-energy.com> <20250901-nios2-implement-clone3-v2-1-53fcf5577d57@siemens-energy.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: C4C381C0012 X-Stat-Signature: 1ut1xcqrjcskns81uf6kyre9bhipxdwa X-Rspam-User: X-HE-Tag: 1756733106-356931 X-HE-Meta: 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 KraQm1Ra iCvRsl5gCZwkaQ+I8ssVC7LcGaPwu6ZLzXgrkzy/A8MU7WrtFjR5fM1Jodn7rpH8TZvAVzZ7f6gsU6FAdNzhygwWDfZnpcj+97qoja2pTYyc+R5Of0RPnj+V3v4qIphOoV3JDGtiqbKuLVsuvkDAaDPHXdiNEk2V7pjpNELWnJoMSqdgMPtj9fiMFHBu3wXGlH8dmQ8HwMiVublvP9rY3G6Yi9ov6ieXPEaqbI+OSt6cU6sCCoArVN+DDE2Drs9kEN+ytLasQYZeWSPrFz1YvTwWq/FCxyorngQRFSm1mInnuqkVL9TLvgdY7gXEZSSO6Mea76MSt3pzFv42rbqizF0Hlde6bPd1yr1ylB6Cl37aFT0u/cxzaLEBpSfSC4xFdkseI772+7DgQ1dfhd26Wu3Jqlm3v2HUY819wA5qYaqgpKfpdXy7GLAoPYOCbhItbtyjN5hxlOZxkwnZW+D/attLEiBKGMt9dum4778UJ+88jsD7Um12OhHD30o0NrmoxFclvE5iWmh9i7oAQ2f/+9zapzJcTZooOTHsvKeDDkW01J8h/ohm0G58SBN68QIzw6GDTCOVzvdmuLVo2lBsPr2XOvbFmVgKP21aSKMzfdQwTmeOThX4yZV69DOcPtBIZwsr8L2d9EC/OBa2J9cc9Gyw6fYydyHrNiwNVbjIqmESD19O9deOUrAsdwjaQ2xp9VXgG 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 01.09.25 15:09, Simon Schuster via B4 Relay wrote: > From: Simon Schuster > > With the introduction of clone3 in commit 7f192e3cd316 ("fork: add > clone3") the effective bit width of clone_flags on all architectures was > increased from 32-bit to 64-bit. However, the signature of the copy_* > helper functions (e.g., copy_sighand) used by copy_process was not > adapted. > > As such, they truncate the flags on any 32-bit architectures that > supports clone3 (arc, arm, csky, m68k, microblaze, mips32, openrisc, > parisc32, powerpc32, riscv32, x86-32 and xtensa). > > For copy_sighand with CLONE_CLEAR_SIGHAND being an actual u64 > constant, this triggers an observable bug in kernel selftest > clone3_clear_sighand: > > if (clone_flags & CLONE_CLEAR_SIGHAND) > > in function copy_sighand within fork.c will always fail given: > > unsigned long /* == uint32_t */ clone_flags > #define CLONE_CLEAR_SIGHAND 0x100000000ULL > > This commit fixes the bug by always passing clone_flags to copy_sighand > via their declared u64 type, invariant of architecture-dependent integer > sizes. > > Fixes: b612e5df4587 ("clone3: add CLONE_CLEAR_SIGHAND") > Cc: stable@vger.kernel.org # linux-5.5+ > Signed-off-by: Simon Schuster > Reviewed-by: Lorenzo Stoakes > --- (stripping To list) Acked-by: David Hildenbrand -- Cheers David / dhildenb