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

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

[Luka]

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

Re: [BUG] WARNING in shmem_rmdir in Linux kernel v6.12

[Andrew Morton]

On Wed, 4 Jun 2025 12:43:01 +0800 Luka <luka.2016.cs@gmail.com> wrote:

> 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.

Please just include all the bug info in the email.

> 
> 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

Those links don't work for me.  "We're sorry, but the contents of the
bin could not be found, or it has been deleted"