linux-kernel - Re: [PATCH] arm64: pageattr: use untagged address to calclulate page index

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Message-ID: <176366223676.2472999.13349582188639740837.b4-ty@arm.com>
Date: Thu, 20 Nov 2025 18:13:09 +0000
From: Catalin Marinas <catalin.marinas@....com>
To: ryan.roberts@....com, dev.jain@....com, cl@...two.org, will@...nel.org,
	nathan@...nel.org, Yang Shi <yang@...amperecomputing.com>
Cc: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: pageattr: use untagged address to calclulate page
 index

On Tue, 18 Nov 2025 20:19:45 -0800, Yang Shi wrote:
> Nathan Chancellor reported the below bug:
> 
> [    0.149929] BUG: KASAN: invalid-access in change_memory_common+0x258/0x2d0
> [    0.151006] Read of size 8 at addr f96680000268a000 by task swapper/0/1
> [    0.152031]
> [    0.152274] CPU: 0 UID: 0 PID: 1 Comm: swapper/0 Not tainted 6.18.0-rc1-00012-g37cb0aab9068 #1 PREEMPT
> [    0.152288] Hardware name: linux,dummy-virt (DT)
> [    0.152292] Call trace:
> [    0.152295]  show_stack+0x18/0x30 (C)
> [    0.152309]  dump_stack_lvl+0x60/0x80
> [    0.152320]  print_report+0x480/0x498
> [    0.152331]  kasan_report+0xac/0xf0
> [    0.152343]  kasan_check_range+0x90/0xb0
> [    0.152353]  __hwasan_load8_noabort+0x20/0x34
> [    0.152364]  change_memory_common+0x258/0x2d0
> [    0.152375]  set_memory_ro+0x18/0x24
> [    0.152386]  bpf_prog_pack_alloc+0x200/0x2e8
> [    0.152397]  bpf_jit_binary_pack_alloc+0x78/0x188
> [    0.152409]  bpf_int_jit_compile+0xa4c/0xc74
> [    0.152420]  bpf_prog_select_runtime+0x1c0/0x2bc
> [    0.152430]  bpf_prepare_filter+0x5a4/0x7c0
> [    0.152443]  bpf_prog_create+0xa4/0x100
> [    0.152454]  ptp_classifier_init+0x80/0xd0
> [    0.152465]  sock_init+0x12c/0x178
> [    0.152474]  do_one_initcall+0xa0/0x260
> [    0.152484]  kernel_init_freeable+0x2d8/0x358
> [    0.152495]  kernel_init+0x20/0x140
> [    0.152510]  ret_from_fork+0x10/0x20
> 
> [...]

Applied to arm64 (for-next/misc), thanks!

[1/1] arm64: mm: use untagged address to calculate page index
      https://git.kernel.org/arm64/c/a06494adb7ef

-- 
Catalin