From: Lorenzo Stoakes <ljs@kernel.org>
To: Russell King <linux@armlinux.org.uk>
Cc: Qi Xi <xiqi2@huawei.com>, Xie Yuanbin <xieyuanbin1@huawei.com>,
akpm@linux-foundation.org, david@kernel.org, liam@infradead.org,
vbabka@kernel.org, rppt@kernel.org, surenb@google.com,
mhocko@suse.com, linusw@kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, sunnanyong@huawei.com,
linux-mm@kvack.org, lilinjie8@huawei.com, liaohua4@huawei.com
Subject: Re: [PATCH v3 1/2] ARM: mm: fix use-after-free in __do_user_fault() under CONFIG_DEBUG_USER
Date: Tue, 7 Jul 2026 13:47:14 +0100 [thread overview]
Message-ID: <akz1LNXtM2ign5u1@lucifer> (raw)
In-Reply-To: <akzpuerKqOY7qfFi@shell.armlinux.org.uk>
On Tue, Jul 07, 2026 at 12:57:45PM +0100, Russell King wrote:
> On Tue, Jul 07, 2026 at 07:48:12PM +0800, Qi Xi wrote:
> > You're right. And I think the fix is to simply skip show_pte() for kernel
> > addresses.
>
> No. This information is useful debug for kernel oops.
Yup see my reply, just upgrade it to an mmap write lock and you should be
safe to keep this.
>
> --
> RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
> FTTP is here! 80Mbps down 10Mbps up. Decent connectivity at last!
Cheers, Lorenzo
next prev parent reply other threads:[~2026-07-07 12:47 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-06-26 7:30 [PATCH v3 0/2] ARM: mm: fix use-after-free in show_pte() Qi Xi
2026-06-26 7:30 ` [PATCH v3 1/2] ARM: mm: fix use-after-free in __do_user_fault() under CONFIG_DEBUG_USER Qi Xi
2026-06-26 9:44 ` Russell King
2026-06-27 1:39 ` Qi Xi
2026-07-06 13:32 ` Xie Yuanbin
2026-07-07 11:48 ` Qi Xi
2026-07-07 11:57 ` Russell King
2026-07-07 12:47 ` Qi Xi
2026-07-07 12:47 ` Lorenzo Stoakes [this message]
2026-07-07 13:14 ` Xie Yuanbin
2026-07-07 13:20 ` Lorenzo Stoakes
2026-07-07 14:04 ` Xie Yuanbin
2026-07-07 15:34 ` Russell King
2026-07-10 2:32 ` Qi Xi
2026-07-07 12:46 ` Lorenzo Stoakes
2026-07-07 13:35 ` Xie Yuanbin
2026-06-26 7:30 ` [PATCH v3 2/2] ARM: mm: protect show_pte() in do_DataAbort() fallback path Qi Xi
2026-06-26 9:45 ` Russell King
2026-06-26 10:16 ` Xie Yuanbin
2026-06-26 12:37 ` Russell King
2026-06-27 1:22 ` Xie Yuanbin
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