linux-kernel - [Bug] spinlock recursion in pl011_console

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Message-ID: <CALm_T+1OF_Vvigyt6Jdb1f0LjXysCfcjMFN1842KKRFbyzi+ug@mail.gmail.com>
Date: Wed, 4 Jun 2025 11:02:33 +0800
From: Luka <luka.2016.cs@...il.com>
To: Russell King <linux@...linux.org.uk>, Jiri Slaby <jirislaby@...nel.org>
Cc: linux-kernel@...r.kernel.org
Subject: [Bug] spinlock recursion in pl011_console_write in Linux 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:  pl011_console_write+0xf4/0x770
drivers/tty/serial/amba-pl011.c:2323

Bug Report: https://hastebin.com/share/duhenefemo.bash

Entire Log: https://hastebin.com/share/unogayisol.less

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