linux-kernel - [BUG] WARNING in do_sve

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Message-ID: <CALm_T+0k9oZ-AN+4jk=07DPfLpWM7jZQK9s4KWi5kMiEjOi1Aw@mail.gmail.com>
Date: Wed, 4 Jun 2025 12:57:30 +0800
From: Luka <luka.2016.cs@...il.com>
To: Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>
Cc: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [BUG] WARNING in do_sve_acc in Linux kernel v6.6

Dear Kernel Maintainers,

I am writing to report a potential vulnerability identified in the
upstream Linux Kernel version v6.6, corresponding to the following
commit in the mainline repository:

Git Commit: ffc253263a1375a65fa6c9f62a893e9767fbebfa (tag: v6.6)

This issue was discovered during the testing of the Android 15 AOSP
kernel, which is based on Linux kernel version 6.6, specifically from
the AOSP kernel branch:

AOSP kernel branch: android15-6.6
Manifest path: kernel/common.git
Source URL:  https://android.googlesource.com/kernel/common/+/refs/heads/android15-6.6

Although this kernel branch is used in Android 15 development, its
base is aligned with the upstream Linux v6.6 release. I observed this
issue while conducting stability and fuzzing tests on the Android 15
platform and identified that the root cause lies in the upstream
codebase.

Bug Location:  do_sve_acc+0x17c/0x3f4 arch/arm64/kernel/fpsimd.c:1479

Bug Report: https://hastebin.com/share/calarosado.css

Entire Log: https://hastebin.com/share/efepocaxoh.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