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From: "Russell King (Oracle)" <linux@armlinux.org.uk>
To: Jungseung Lee <js07.lee@samsung.com>
Cc: linus.walleij@linaro.org, amit.kachhap@arm.com, ardb@kernel.org,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, keescook@chromium.org,
	js07.lee@gmail.com
Subject: Re: [PATCH 1/2] arm/mm : omit [_text, _stext) from kernel code region
Date: Mon, 6 Mar 2023 11:06:05 +0000	[thread overview]
Message-ID: <ZAXJHbHAhD42o36F@shell.armlinux.org.uk> (raw)
In-Reply-To: <1678081915-12599-1-git-send-email-js07.lee@samsung.com>

On Mon, Mar 06, 2023 at 02:51:54PM +0900, Jungseung Lee wrote:
> The resource reservations in /proc/iomem made for the kernel code did
> not reflect the gaps between pagetable and text.
> 
> In particular, if the CONFIG_STRICT_KERNEL_RWX option is turned on,
> the wrong area is shown as the kernel code area.
> 
> Fix it by removing [_text, _stext) from kernel code region.
> 
> Before:
> 04000000-2f7fffff : System RAM
>   04008000-04cfffff : Kernel code
>   04e00000-05369a27 : Kernel data
> 
> After :
> 04000000-2f7fffff : System RAM
>   04100000-04cfffff : Kernel code
>   04e00000-05369a27 : Kernel data

And why do you think this is correct? Isn't the head text, which
isn't discarded and is located at 0x04008000, still part of kernel
code?

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
FTTP is here! 40Mbps down 10Mbps up. Decent connectivity at last!

_______________________________________________
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linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

WARNING: multiple messages have this Message-ID (diff)
From: "Russell King (Oracle)" <linux@armlinux.org.uk>
To: Jungseung Lee <js07.lee@samsung.com>
Cc: linus.walleij@linaro.org, amit.kachhap@arm.com, ardb@kernel.org,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, keescook@chromium.org,
	js07.lee@gmail.com
Subject: Re: [PATCH 1/2] arm/mm : omit [_text, _stext) from kernel code region
Date: Mon, 6 Mar 2023 11:06:05 +0000	[thread overview]
Message-ID: <ZAXJHbHAhD42o36F@shell.armlinux.org.uk> (raw)
In-Reply-To: <1678081915-12599-1-git-send-email-js07.lee@samsung.com>

On Mon, Mar 06, 2023 at 02:51:54PM +0900, Jungseung Lee wrote:
> The resource reservations in /proc/iomem made for the kernel code did
> not reflect the gaps between pagetable and text.
> 
> In particular, if the CONFIG_STRICT_KERNEL_RWX option is turned on,
> the wrong area is shown as the kernel code area.
> 
> Fix it by removing [_text, _stext) from kernel code region.
> 
> Before:
> 04000000-2f7fffff : System RAM
>   04008000-04cfffff : Kernel code
>   04e00000-05369a27 : Kernel data
> 
> After :
> 04000000-2f7fffff : System RAM
>   04100000-04cfffff : Kernel code
>   04e00000-05369a27 : Kernel data

And why do you think this is correct? Isn't the head text, which
isn't discarded and is located at 0x04008000, still part of kernel
code?

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
FTTP is here! 40Mbps down 10Mbps up. Decent connectivity at last!

  parent reply	other threads:[~2023-03-06 11:09 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <CGME20230306061055epcas1p1f7718c46c10f84845e086f9ce9f9a41f@epcas1p1.samsung.com>
2023-03-06  5:51 ` [PATCH 1/2] arm/mm : omit [_text, _stext) from kernel code region Jungseung Lee
2023-03-06  5:51   ` Jungseung Lee
2023-03-06  5:51   ` [PATCH 2/2] arm/mm : Report actual image regions in /proc/iomem Jungseung Lee
2023-03-06  5:51     ` Jungseung Lee
2023-03-06 11:10     ` Russell King (Oracle)
2023-03-06 11:10       ` Russell King (Oracle)
2023-03-06 12:14       ` Jungseung Lee
2023-03-06 12:14         ` Jungseung Lee
2023-03-06 12:28         ` Russell King (Oracle)
2023-03-06 12:28           ` Russell King (Oracle)
2023-03-06 13:00           ` Ard Biesheuvel
2023-03-06 13:00             ` Ard Biesheuvel
2023-03-06 11:06   ` Russell King (Oracle) [this message]
2023-03-06 11:06     ` [PATCH 1/2] arm/mm : omit [_text, _stext) from kernel code region Russell King (Oracle)

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