From: "gaoliming" <gaoliming@byosoft.com.cn>
To: <devel@edk2.groups.io>, <afish@apple.com>
Subject: 回复: [edk2-devel] gEfiMdeModulePkgTokenSpaceGuid.PcdNullPointerDetectionPropertyMask and ExitBootServices
Date: Thu, 27 Aug 2020 09:38:47 +0800 [thread overview]
Message-ID: <003001d67c12$cf25b9e0$6d712da0$@byosoft.com.cn> (raw)
In-Reply-To: <2030C8D7-3DF6-4374-8BDF-BEC2B11344C8@apple.com>
Fish:
If PcdNullPointerDetectionPropertyMask BIT7 is set, it will be disabled on EndOfDxe. Do you mean to always turn off it on ExitBootServices? But, after ExitBootSerivces, there should be no memory allocation.
Thanks
Liming
> -----邮件原件-----
> 发件人: bounce+27952+64665+4905953+8761045@groups.io
> <bounce+27952+64665+4905953+8761045@groups.io> 代表 Andrew Fish
> via groups.io
> 发送时间: 2020年8月27日 8:34
> 收件人: edk2-devel-groups-io <devel@edk2.groups.io>
> 主题: [edk2-devel]
> gEfiMdeModulePkgTokenSpaceGuid.PcdNullPointerDetectionPropertyMask
> and ExitBootServices
>
> I think I might have found a case when grub calls ExitBootServices,
> PcdNullPointerDetectionPropertyMask is TRUE, and grub decided to allocate
> memory in the guard area….
>
> Is there any code to turn off PcdNullPointerDetectionPropertyMask at
> ExitBootServices time?
>
> Seems like MemoryProtectionExitBootServicesCallback() should also turn off
> PcdNullPointerDetectionPropertyMask?
>
> Thanks,
>
> Andrew Fish
>
prev parent reply other threads:[~2020-08-27 1:38 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-27 0:33 gEfiMdeModulePkgTokenSpaceGuid.PcdNullPointerDetectionPropertyMask and ExitBootServices Andrew Fish
2020-08-27 1:38 ` gaoliming [this message]
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