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Message-ID: <5db507747b2be22499e7357ce65f1800b36e1de4.camel@linux.ibm.com>
Subject: Re: [PATCH v8 2/4] kexec, KEYS: make the code in
 bzImage64_verify_sig generic
From:   Mimi Zohar <zohar@linux.ibm.com>
To:     Coiby Xu <coxu@redhat.com>, kexec@lists.infradead.org
Cc:     linux-arm-kernel@lists.infradead.org,
        Michal Suchanek <msuchanek@suse.de>,
        Baoquan He <bhe@redhat.com>, Dave Young <dyoung@redhat.com>,
        Will Deacon <will@kernel.org>,
        "Eric W . Biederman" <ebiederm@xmission.com>,
        Chun-Yi Lee <jlee@suse.com>, keyrings@vger.kernel.org,
        linux-security-module@vger.kernel.org,
        Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
        Dave Hansen <dave.hansen@linux.intel.com>,
        "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@kernel.org>,
        "H. Peter Anvin" <hpa@zytor.com>,
        "open list:X86 ARCHITECTURE (32-BIT AND 64-BIT)" 
        <linux-kernel@vger.kernel.org>
Date:   Thu, 09 Jun 2022 18:18:44 -0400
In-Reply-To: <20220512070123.29486-3-coxu@redhat.com>
References: <20220512070123.29486-1-coxu@redhat.com>
         <20220512070123.29486-3-coxu@redhat.com>
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Hi Coiby,

On Thu, 2022-05-12 at 15:01 +0800, Coiby Xu wrote:
> commit 278311e417be ("kexec, KEYS: Make use of platform keyring for
> signature verify") adds platform keyring support on x86 kexec but not
> arm64.
> 
> The code in bzImage64_verify_sig makes use of system keyrings including
> .buitin_trusted_keys, .secondary_trusted_keys and .platform keyring to
> verify signed kernel image as PE file. Make it generic so both x86_64
> and arm64 can use it.

^uses the keys on the .builtin_trusted_keys, .machine, if configured
and enabled, .secondary_trusted_keys, also if configured, and .platform
keyrings to verify the signed kernel image as PE file. 

> 
> @@ -202,6 +203,12 @@ int arch_kexec_apply_relocations(struct purgatory_info *pi,
>  				 const Elf_Shdr *relsec,
>  				 const Elf_Shdr *symtab);
>  int arch_kimage_file_post_load_cleanup(struct kimage *image);
> +#ifdef CONFIG_KEXEC_SIG
> +#ifdef CONFIG_SIGNED_PE_FILE_VERIFICATION
> +int kexec_kernel_verify_pe_sig(const char *kernel,
> +				    unsigned long kernel_len);

Please join this line with the previous one.

> +#endif
> +#endif
>  int arch_kexec_locate_mem_hole(struct kexec_buf *kbuf);
>  
>  extern int kexec_add_buffer(struct kexec_buf *kbuf);

thanks,

Mimi