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Message-ID: <ZmLZkvYRJvdRVqwr@MiWiFi-R3L-srv>
Date: Fri, 7 Jun 2024 17:57:38 +0800
From: Baoquan He <bhe@...hat.com>
To: Coiby Xu <coxu@...hat.com>
Cc: kexec@...ts.infradead.org, Ondrej Kozina <okozina@...hat.com>,
Milan Broz <gmazyland@...il.com>,
Thomas Staudt <tstaudt@...ibm.com>,
Daniel P . Berrangé <berrange@...hat.com>,
Kairui Song <ryncsn@...il.com>,
Jan Pazdziora <jpazdziora@...hat.com>,
Pingfan Liu <kernelfans@...il.com>, Dave Young <dyoung@...hat.com>,
linux-kernel@...r.kernel.org, x86@...nel.org,
Dave Hansen <dave.hansen@...el.com>,
Vitaly Kuznetsov <vkuznets@...hat.com>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
Dave Hansen <dave.hansen@...ux.intel.com>,
"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH v4 6/7] x86/crash: pass dm crypt keys to kdump kernel
On 05/23/24 at 01:04pm, Coiby Xu wrote:
> 1st kernel will build up the kernel command parameter dmcryptkeys as
> similar to elfcorehdr to pass the memory address of the stored info of
> dm crypt key to kdump kernel.
>
> Signed-off-by: Coiby Xu <coxu@...hat.com>
> ---
> arch/x86/kernel/crash.c | 15 ++++++++++++++-
> arch/x86/kernel/kexec-bzimage64.c | 7 +++++++
> 2 files changed, 21 insertions(+), 1 deletion(-)
>
> diff --git a/arch/x86/kernel/crash.c b/arch/x86/kernel/crash.c
> index f06501445cd9..74b3844ae53c 100644
> --- a/arch/x86/kernel/crash.c
> +++ b/arch/x86/kernel/crash.c
> @@ -266,6 +266,7 @@ static int memmap_exclude_ranges(struct kimage *image, struct crash_mem *cmem,
> unsigned long long mend)
> {
> unsigned long start, end;
> + int r;
~?
r is only to contain the returned value? Then you can call it ret as
many do in kernel code.
>
> cmem->ranges[0].start = mstart;
> cmem->ranges[0].end = mend;
> @@ -274,7 +275,19 @@ static int memmap_exclude_ranges(struct kimage *image, struct crash_mem *cmem,
> /* Exclude elf header region */
> start = image->elf_load_addr;
> end = start + image->elf_headers_sz - 1;
> - return crash_exclude_mem_range(cmem, start, end);
> + r = crash_exclude_mem_range(cmem, start, end);
> +
> + if (r)
> + return r;
> +
> + /* Exclude dm crypt keys region */
> + if (image->dm_crypt_keys_addr) {
> + start = image->dm_crypt_keys_addr;
> + end = start + image->dm_crypt_keys_sz - 1;
> + return crash_exclude_mem_range(cmem, start, end);
> + }
You need adjust the array length of cmem->ranges[], I believe you will
cause the array overflow because the keys are randomly set and mostly
will be in the middle of crashkernel region.
> +
> + return r;
> }
>
> /* Prepare memory map for crash dump kernel */
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