From: Catalin Marinas <catalin.marinas@arm.com>
To: Kuan-Ying Lee <Kuan-Ying.Lee@mediatek.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Matthias Brugger <matthias.bgg@gmail.com>,
chinwen.chang@mediatek.com, nicholas.tang@mediatek.com,
yee.lee@mediatek.com, linux-mm@kvack.org,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-mediatek@lists.infradead.org
Subject: Re: [PATCH] mm/kmemleak: Reset tag when compare object pointer
Date: Fri, 18 Mar 2022 14:30:43 +0000 [thread overview]
Message-ID: <YjSXkyq6icIFx4GS@arm.com> (raw)
In-Reply-To: <20220318034051.30687-1-Kuan-Ying.Lee@mediatek.com>
On Fri, Mar 18, 2022 at 11:40:48AM +0800, Kuan-Ying Lee wrote:
> When we use HW-tag based kasan and enable vmalloc support, we hit
> the following bug. It is due to comparison between tagged object
> and non-tagged pointer.
>
> We need to reset the kasan tag when we need to compare tagged object
> and non-tagged pointer.
>
> [ 7.690429][T400001] init: kmemleak: [name:kmemleak&]Scan area larger than object 0xffffffe77076f440
> [ 7.691762][T400001] init: CPU: 4 PID: 1 Comm: init Tainted: G S W 5.15.25-android13-0-g5cacf919c2bc #1
> [ 7.693218][T400001] init: Hardware name: MT6983(ENG) (DT)
> [ 7.693983][T400001] init: Call trace:
> [ 7.694508][T400001] init: dump_backtrace.cfi_jt+0x0/0x8
> [ 7.695272][T400001] init: dump_stack_lvl+0xac/0x120
> [ 7.695985][T400001] init: add_scan_area+0xc4/0x244
> [ 7.696685][T400001] init: kmemleak_scan_area+0x40/0x9c
> [ 7.697428][T400001] init: layout_and_allocate+0x1e8/0x288
> [ 7.698211][T400001] init: load_module+0x2c8/0xf00
> [ 7.698895][T400001] init: __se_sys_finit_module+0x190/0x1d0
> [ 7.699701][T400001] init: __arm64_sys_finit_module+0x20/0x30
> [ 7.700517][T400001] init: invoke_syscall+0x60/0x170
> [ 7.701225][T400001] init: el0_svc_common+0xc8/0x114
> [ 7.701933][T400001] init: do_el0_svc+0x28/0xa0
> [ 7.702580][T400001] init: el0_svc+0x60/0xf8
> [ 7.703196][T400001] init: el0t_64_sync_handler+0x88/0xec
> [ 7.703964][T400001] init: el0t_64_sync+0x1b4/0x1b8
> [ 7.704658][T400001] init: kmemleak: [name:kmemleak&]Object 0xf5ffffe77076b000 (size 32768):
> [ 7.705824][T400001] init: kmemleak: [name:kmemleak&] comm "init", pid 1, jiffies 4294894197
> [ 7.707002][T400001] init: kmemleak: [name:kmemleak&] min_count = 0
> [ 7.707886][T400001] init: kmemleak: [name:kmemleak&] count = 0
> [ 7.708718][T400001] init: kmemleak: [name:kmemleak&] flags = 0x1
> [ 7.709574][T400001] init: kmemleak: [name:kmemleak&] checksum = 0
> [ 7.710440][T400001] init: kmemleak: [name:kmemleak&] backtrace:
> [ 7.711284][T400001] init: module_alloc+0x9c/0x120
> [ 7.712015][T400001] init: move_module+0x34/0x19c
> [ 7.712735][T400001] init: layout_and_allocate+0x1c4/0x288
> [ 7.713561][T400001] init: load_module+0x2c8/0xf00
> [ 7.714291][T400001] init: __se_sys_finit_module+0x190/0x1d0
> [ 7.715142][T400001] init: __arm64_sys_finit_module+0x20/0x30
> [ 7.716004][T400001] init: invoke_syscall+0x60/0x170
> [ 7.716758][T400001] init: el0_svc_common+0xc8/0x114
> [ 7.717512][T400001] init: do_el0_svc+0x28/0xa0
> [ 7.718207][T400001] init: el0_svc+0x60/0xf8
> [ 7.718869][T400001] init: el0t_64_sync_handler+0x88/0xec
> [ 7.719683][T400001] init: el0t_64_sync+0x1b4/0x1b8
>
> Signed-off-by: Kuan-Ying Lee <Kuan-Ying.Lee@mediatek.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
prev parent reply other threads:[~2022-03-18 14:30 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-18 3:40 Kuan-Ying Lee
2022-03-18 14:30 ` Catalin Marinas [this message]
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