linux-kernel - [BUG] WARNING in shmem_rmdir in Linux kernel v6.12

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Message-ID: <CALm_T+1tHV6QmeykRwch602TzgJet+1dOWe25VSV6dw_Xo0SyQ@mail.gmail.com>
Date: Wed, 4 Jun 2025 12:43:01 +0800
From: Luka <luka.2016.cs@...il.com>
To: Hugh Dickins <hughd@...gle.com>, Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: [BUG] WARNING in shmem_rmdir in Linux kernel v6.12

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