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From: "Seongsu Park" <sgsu.park@samsung.com>
To: "'Yeo Reum Yun'" <YeoReum.Yun@arm.com>
Cc: "'Catalin Marinas'" <Catalin.Marinas@arm.com>, <will@kernel.org>,
	<linux-arm-kernel@lists.infradead.org>,
	<linux-kernel@vger.kernel.org>
Subject: RE: [PATCH] arm64: Fix PIE_E1 mapping for _PAGE_READONLY_EXEC
Date: Sun, 28 Dec 2025 02:38:59 +0900	[thread overview]
Message-ID: <000001dc7757$af3294a0$0d97bde0$@samsung.com> (raw)
In-Reply-To: <GV1PR08MB105210D9BD328C2446CA8C551FBB1A@GV1PR08MB10521.eurprd08.prod.outlook.com>

Hi Yeoreum,

> NIT: This looks like it allows executing user code from the kernel.
> Why is this necessary?

Good Catch. You're absolutely right.
I misunderstood how PIE separates EL0/EL1 permissions.
The kernel should only have read access to the executing user code pages.
The original PIE_EL1 mapping to PIE_R is correct.
My patch would be a security regression. Please disregard.

Thanks for the careful review,
Seongsu Park.


      reply	other threads:[~2025-12-27 17:39 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <CGME20251227070633epcas1p3a8f7c19c9f5114a46765073fa16ba449@epcas1p3.samsung.com>
2025-12-27  7:06 ` Seongsu Park
2025-12-27 15:46   ` Yeo Reum Yun
2025-12-27 17:38     ` Seongsu Park [this message]

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