linux-kernel - Re: [PATCH] sched/task_stack: Fix object_is_on

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Message-Id: <20241112230644.cfe24aa5e863112de04b16c0@linux-foundation.org>
Date: Tue, 12 Nov 2024 23:06:44 -0800
From: Andrew Morton <akpm@...ux-foundation.org>
To: Qun-Wei Lin <qun-wei.lin@...iatek.com>
Cc: Matthias Brugger <matthias.bgg@...il.com>, AngeloGioacchino Del Regno
 <angelogioacchino.delregno@...labora.com>, Shakeel Butt
 <shakeel.butt@...ux.dev>, Kent Overstreet <kent.overstreet@...ux.dev>,
 Pasha Tatashin <pasha.tatashin@...een.com>, <linux-kernel@...r.kernel.org>,
 <linux-arm-kernel@...ts.infradead.org>,
 <linux-mediatek@...ts.infradead.org>, <catalin.marinas@....com>, Casper Li
 <casper.li@...iatek.com>, Chinwen Chang <chinwen.chang@...iatek.com>,
 Andrew Yang <andrew.yang@...iatek.com>, Elena Yu <elena.yu@...iatek.com>,
 <wsd_upstream@...iatek.com>
Subject: Re: [PATCH] sched/task_stack: Fix object_is_on_stack() for KASAN
 tagged pointers

On Wed, 13 Nov 2024 12:25:43 +0800 Qun-Wei Lin <qun-wei.lin@...iatek.com> wrote:

> When CONFIG_KASAN_SW_TAGS and CONFIG_KASAN_STACK are enabled, the
> object_is_on_stack() function may produce incorrect results due to the
> presence of tags in the obj pointer, while the stack pointer does not
> have tags. This discrepancy can lead to incorrect stack object detection
> and subsequently trigger warnings if CONFIG_DEBUG_OBJECTS is also
> enabled.
> 
> Example of the warning:

Thanks.

Are we able to identify when this started happening?  ie, a suitable
Fixes: taret?