linux-kernel - Re: [PATCH 1/1] kexec_file: fix elfcorehdr digest exclusion when CONFIG_CRASH

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Message-ID: <ZrFZM4W7S89VpfaG@MiWiFi-R3L-srv>
Date: Tue, 6 Aug 2024 06:59:35 +0800
From: Baoquan He <bhe@...hat.com>
To: Petr Tesarik <petr.tesarik@...e.com>
Cc: Eric Biederman <ebiederm@...ssion.com>,
	Sourabh Jain <sourabhjain@...ux.ibm.com>,
	Hari Bathini <hbathini@...ux.ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Eric DeVolder <eric.devolder@...cle.com>,
	"open list:KEXEC" <kexec@...ts.infradead.org>,
	open list <linux-kernel@...r.kernel.org>,
	Petr Tesarik <ptesarik@...e.com>, stable@...nel.org
Subject: Re: [PATCH 1/1] kexec_file: fix elfcorehdr digest exclusion when
 CONFIG_CRASH_HOTPLUG=y

On 08/05/24 at 05:07pm, Petr Tesarik wrote:
> From: Petr Tesarik <ptesarik@...e.com>
> 
> Fix the condition to exclude the elfcorehdr segment from the SHA digest
> calculation.
> 
> The j iterator is an index into the output sha_regions[] array, not into
> the input image->segment[] array. Once it reaches image->elfcorehdr_index,
> all subsequent segments are excluded. Besides, if the purgatory segment
> precedes the elfcorehdr segment, the elfcorehdr may be wrongly included in
> the calculation.

Indeed, good catch.

Acked-by: Baoquan He <bhe@...hat.com>

> 
> Fixes: f7cc804a9fd4 ("kexec: exclude elfcorehdr from the segment digest")
> Cc: stable@...nel.org
> Signed-off-by: Petr Tesarik <ptesarik@...e.com>
> ---
>  kernel/kexec_file.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/kernel/kexec_file.c b/kernel/kexec_file.c
> index 3d64290d24c9..3eedb8c226ad 100644
> --- a/kernel/kexec_file.c
> +++ b/kernel/kexec_file.c
> @@ -752,7 +752,7 @@ static int kexec_calculate_store_digests(struct kimage *image)
>  
>  #ifdef CONFIG_CRASH_HOTPLUG
>  		/* Exclude elfcorehdr segment to allow future changes via hotplug */
> -		if (j == image->elfcorehdr_index)
> +		if (i == image->elfcorehdr_index)
>  			continue;
>  #endif
>  
> -- 
> 2.45.2
>