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Tue, 03 Jun 2025 21:43:14 -0700 (PDT) MIME-Version: 1.0 From: Luka Date: Wed, 4 Jun 2025 12:43:01 +0800 X-Gm-Features: AX0GCFtGPwUH-5RHmsDNhCa3bSrRvzuXpss7GX4IPhkuraXTR9vUC3sB0YpBgHc Message-ID: Subject: [BUG] WARNING in shmem_rmdir in Linux kernel v6.12 To: Hugh Dickins , Andrew Morton Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org Content-Type: text/plain; charset="UTF-8" X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: 02BA580002 X-Stat-Signature: kjmd7cj1mstnw8kk1odar6xyyy3xe7st X-Rspam-User: X-HE-Tag: 1749012196-908907 X-HE-Meta: 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 4wweo3nd 8z/+fWZJpBXBfE7hOhZkgC7WTkyUHiP6AUPxZPyB7xWBtGtUW4uQBiOFc3Eu+n5/ASLhu5FaT3Y/11Yh+ikwXb7inJvo3ldYHpoJsPMleIuv4RzCricNsKzGAZI/mz9LYCpW5/S6PDT99a2IRPL7UWhxi708jp2NrxrPtzu8zOQh5LWNVKROUy0NgMw9DoNzmYmJNtoLwy4PO0FuDEy1AOStPBTKD8SuhYwtwoZ0wpWW6URkmEpqBnoY+dQeHuVIBSErNRPprzAVKPoeY8yIAY8+2Cflx4fPglw6+p7SiOajtEv+ZyvhyN17IJLEEHoOxrZzH1ND+4XHNSEOJJQax4W7h+/OI8wWGuWnybzKYHNPrfXWEy1pskZyDcQV3bDE/wSzWAxNwYadSXMNgC5siSBKQ9AUs40OcIgj7xbIT53YzkhxWC/Dcuk1LJUQhA+AwP7ZcBgdV0oxvjYbmMVmB/6tT2DOUOsn7HrjNKnIxeRrmtboPjhwz7zYfrJTnqFN7o7En6EFfn/JEZ/c= 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: Dear Kernel Maintainers, I am writing to report a potential vulnerability identified in the upstream Linux Kernel version v6.12, corresponding to the following commit in the mainline repository: Git Commit: adc218676eef25575469234709c2d87185ca223a (tag: v6.12) This issue was discovered during the testing of the Android 16 AOSP kernel, which is based on Linux kernel version 6.12, specifically from the AOSP kernel branch: AOSP kernel branch: android16-6.12 Manifest path: kernel/common.git Source URL: https://android.googlesource.com/kernel/common/+/refs/heads/android16-6.12 Although this kernel branch is used in Android 16 development, its base is aligned with the upstream Linux v6.12 release. I observed this issue while conducting stability and fuzzing tests on the Android 16 platform and identified that the root cause lies in the upstream codebase. Bug Location: shmem_rmdir+0x48/0x84 mm/shmem.c:3733 Bug Report: https://hastebin.com/share/jazumewiya.css Entire Log: https://hastebin.com/share/uyuyaheken.perl Thank you very much for your time and attention. I sincerely apologize that I am currently unable to provide a reproducer for this issue. However, I am actively working on reproducing the problem, and I will make sure to share any findings or reproducing steps with you as soon as they are available. I greatly appreciate your efforts in maintaining the Linux kernel and your attention to this matter. Best regards, Luka