linux-kernel - Re: [PATCH 0/3 v11] add reserved e820 ranges to the kdump kernel e820 table

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Message-ID: <20190608091030.GB32464@zn.tnic>
Date:   Sat, 8 Jun 2019 11:10:30 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Baoquan He <bhe@...hat.com>
Cc:     lijiang <lijiang@...hat.com>, linux-kernel@...r.kernel.org,
        kexec@...ts.infradead.org, tglx@...utronix.de, mingo@...hat.com,
        akpm@...ux-foundation.org, dave.hansen@...ux.intel.com,
        luto@...nel.org, peterz@...radead.org, x86@...nel.org,
        hpa@...or.com, dyoung@...hat.com, Thomas.Lendacky@....com
Subject: Re: [PATCH 0/3 v11] add reserved e820 ranges to the kdump kernel
 e820 table

On Sat, Jun 08, 2019 at 11:54:51AM +0800, Baoquan He wrote:
> Is it a UEFI box?

Yes.

> If it's uefi machine, it should relate to below issue. Because kexec
> always fails to randomly choose a new position for kernel.

The kernel succeeds in selecting a position for the kernel - the kexec
kernel doesn't load when a panic happens. Rather, the box panics and
nothing more.

> The current kexec code fills boot_params->efi_info->efi_loader_signature,
> but doesn't contruct efi_memmap table. The kexec/kdump kernel will always
> fail to find available slot for KASLR in process_efi_entries.

Kernel has

# CONFIG_RANDOMIZE_BASE is not set

so no KASLR.

-- 
Regards/Gruss,
    Boris.

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