diff mbox series

[v7,2/4] kexec, KEYS: make the code in bzImage64_verify_sig generic

Message ID 20220512023402.9913-3-coxu@redhat.com (mailing list archive)
State New
Headers show
Series None | expand

Commit Message

Coiby Xu May 12, 2022, 2:34 a.m. UTC
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.

Note this patch is needed by a later patch so Cc it to the stable tree
as well.

Cc: kexec@lists.infradead.org
Cc: keyrings@vger.kernel.org
Cc: linux-security-module@vger.kernel.org
Cc: stable@vger.kernel.org # 34d5960af253: kexec: clean up arch_kexec_kernel_verify_sig
Reviewed-by: Michal Suchanek <msuchanek@suse.de>
Signed-off-by: Coiby Xu <coxu@redhat.com>
---
 arch/x86/kernel/kexec-bzimage64.c | 20 +-------------------
 include/linux/kexec.h             |  7 +++++++
 kernel/kexec_file.c               | 17 +++++++++++++++++
 3 files changed, 25 insertions(+), 19 deletions(-)

Comments

Baoquan He May 12, 2022, 2:46 a.m. UTC | #1
On 05/12/22 at 10:34am, 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.
> 
> Note this patch is needed by a later patch so Cc it to the stable tree
> as well.

This note should not be added in log.

> 
> Cc: kexec@lists.infradead.org
> Cc: keyrings@vger.kernel.org
> Cc: linux-security-module@vger.kernel.org
> Cc: stable@vger.kernel.org # 34d5960af253: kexec: clean up arch_kexec_kernel_verify_sig
> Reviewed-by: Michal Suchanek <msuchanek@suse.de>
> Signed-off-by: Coiby Xu <coxu@redhat.com>
> ---

You can put the note here, it won't be added to commit log when merged.
Maybe it can be removed when merged.

Otherwise, LGTM

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

>  arch/x86/kernel/kexec-bzimage64.c | 20 +-------------------
>  include/linux/kexec.h             |  7 +++++++
>  kernel/kexec_file.c               | 17 +++++++++++++++++
>  3 files changed, 25 insertions(+), 19 deletions(-)
> 
> diff --git a/arch/x86/kernel/kexec-bzimage64.c b/arch/x86/kernel/kexec-bzimage64.c
> index 170d0fd68b1f..f299b48f9c9f 100644
> --- a/arch/x86/kernel/kexec-bzimage64.c
> +++ b/arch/x86/kernel/kexec-bzimage64.c
> @@ -17,7 +17,6 @@
>  #include <linux/kernel.h>
>  #include <linux/mm.h>
>  #include <linux/efi.h>
> -#include <linux/verification.h>
>  
>  #include <asm/bootparam.h>
>  #include <asm/setup.h>
> @@ -528,28 +527,11 @@ static int bzImage64_cleanup(void *loader_data)
>  	return 0;
>  }
>  
> -#ifdef CONFIG_KEXEC_BZIMAGE_VERIFY_SIG
> -static int bzImage64_verify_sig(const char *kernel, unsigned long kernel_len)
> -{
> -	int ret;
> -
> -	ret = verify_pefile_signature(kernel, kernel_len,
> -				      VERIFY_USE_SECONDARY_KEYRING,
> -				      VERIFYING_KEXEC_PE_SIGNATURE);
> -	if (ret == -ENOKEY && IS_ENABLED(CONFIG_INTEGRITY_PLATFORM_KEYRING)) {
> -		ret = verify_pefile_signature(kernel, kernel_len,
> -					      VERIFY_USE_PLATFORM_KEYRING,
> -					      VERIFYING_KEXEC_PE_SIGNATURE);
> -	}
> -	return ret;
> -}
> -#endif
> -
>  const struct kexec_file_ops kexec_bzImage64_ops = {
>  	.probe = bzImage64_probe,
>  	.load = bzImage64_load,
>  	.cleanup = bzImage64_cleanup,
>  #ifdef CONFIG_KEXEC_BZIMAGE_VERIFY_SIG
> -	.verify_sig = bzImage64_verify_sig,
> +	.verify_sig = kexec_kernel_verify_pe_sig,
>  #endif
>  };
> diff --git a/include/linux/kexec.h b/include/linux/kexec.h
> index 413235c6c797..da83abfc628b 100644
> --- a/include/linux/kexec.h
> +++ b/include/linux/kexec.h
> @@ -19,6 +19,7 @@
>  #include <asm/io.h>
>  
>  #include <uapi/linux/kexec.h>
> +#include <linux/verification.h>
>  
>  /* Location of a reserved region to hold the crash kernel.
>   */
> @@ -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);
> +#endif
> +#endif
>  int arch_kexec_locate_mem_hole(struct kexec_buf *kbuf);
>  
>  extern int kexec_add_buffer(struct kexec_buf *kbuf);
> diff --git a/kernel/kexec_file.c b/kernel/kexec_file.c
> index 3720435807eb..754885b96aab 100644
> --- a/kernel/kexec_file.c
> +++ b/kernel/kexec_file.c
> @@ -165,6 +165,23 @@ void 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)
> +{
> +	int ret;
> +
> +	ret = verify_pefile_signature(kernel, kernel_len,
> +				      VERIFY_USE_SECONDARY_KEYRING,
> +				      VERIFYING_KEXEC_PE_SIGNATURE);
> +	if (ret == -ENOKEY && IS_ENABLED(CONFIG_INTEGRITY_PLATFORM_KEYRING)) {
> +		ret = verify_pefile_signature(kernel, kernel_len,
> +					      VERIFY_USE_PLATFORM_KEYRING,
> +					      VERIFYING_KEXEC_PE_SIGNATURE);
> +	}
> +	return ret;
> +}
> +#endif
> +
>  static int kexec_image_verify_sig(struct kimage *image, void *buf,
>  		unsigned long buf_len)
>  {
> -- 
> 2.35.3
>
Baoquan He May 12, 2022, 3:52 a.m. UTC | #2
On 05/12/22 at 10:46am, Baoquan He wrote:
> On 05/12/22 at 10:34am, 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.
> > 
> > Note this patch is needed by a later patch so Cc it to the stable tree
> > as well.
> 
> This note should not be added in log.
> 
> > 
> > Cc: kexec@lists.infradead.org
> > Cc: keyrings@vger.kernel.org
> > Cc: linux-security-module@vger.kernel.org
> > Cc: stable@vger.kernel.org # 34d5960af253: kexec: clean up arch_kexec_kernel_verify_sig

Hold on, should we CC stable when it's not fixing an issue?

Hi Coiby,

Just to make clear , is this patch fixing an issue, or it's just an
preparation for later patch's use?

Or I should ask in another way, any problem is solved with this patch?


> > Reviewed-by: Michal Suchanek <msuchanek@suse.de>
> > Signed-off-by: Coiby Xu <coxu@redhat.com>
> > ---
> 
> You can put the note here, it won't be added to commit log when merged.
> Maybe it can be removed when merged.
> 
> Otherwise, LGTM
> 
> Acked-by: Baoquan He <bhe@redhat.com>
> 
> >  arch/x86/kernel/kexec-bzimage64.c | 20 +-------------------
> >  include/linux/kexec.h             |  7 +++++++
> >  kernel/kexec_file.c               | 17 +++++++++++++++++
> >  3 files changed, 25 insertions(+), 19 deletions(-)
> > 
> > diff --git a/arch/x86/kernel/kexec-bzimage64.c b/arch/x86/kernel/kexec-bzimage64.c
> > index 170d0fd68b1f..f299b48f9c9f 100644
> > --- a/arch/x86/kernel/kexec-bzimage64.c
> > +++ b/arch/x86/kernel/kexec-bzimage64.c
> > @@ -17,7 +17,6 @@
> >  #include <linux/kernel.h>
> >  #include <linux/mm.h>
> >  #include <linux/efi.h>
> > -#include <linux/verification.h>
> >  
> >  #include <asm/bootparam.h>
> >  #include <asm/setup.h>
> > @@ -528,28 +527,11 @@ static int bzImage64_cleanup(void *loader_data)
> >  	return 0;
> >  }
> >  
> > -#ifdef CONFIG_KEXEC_BZIMAGE_VERIFY_SIG
> > -static int bzImage64_verify_sig(const char *kernel, unsigned long kernel_len)
> > -{
> > -	int ret;
> > -
> > -	ret = verify_pefile_signature(kernel, kernel_len,
> > -				      VERIFY_USE_SECONDARY_KEYRING,
> > -				      VERIFYING_KEXEC_PE_SIGNATURE);
> > -	if (ret == -ENOKEY && IS_ENABLED(CONFIG_INTEGRITY_PLATFORM_KEYRING)) {
> > -		ret = verify_pefile_signature(kernel, kernel_len,
> > -					      VERIFY_USE_PLATFORM_KEYRING,
> > -					      VERIFYING_KEXEC_PE_SIGNATURE);
> > -	}
> > -	return ret;
> > -}
> > -#endif
> > -
> >  const struct kexec_file_ops kexec_bzImage64_ops = {
> >  	.probe = bzImage64_probe,
> >  	.load = bzImage64_load,
> >  	.cleanup = bzImage64_cleanup,
> >  #ifdef CONFIG_KEXEC_BZIMAGE_VERIFY_SIG
> > -	.verify_sig = bzImage64_verify_sig,
> > +	.verify_sig = kexec_kernel_verify_pe_sig,
> >  #endif
> >  };
> > diff --git a/include/linux/kexec.h b/include/linux/kexec.h
> > index 413235c6c797..da83abfc628b 100644
> > --- a/include/linux/kexec.h
> > +++ b/include/linux/kexec.h
> > @@ -19,6 +19,7 @@
> >  #include <asm/io.h>
> >  
> >  #include <uapi/linux/kexec.h>
> > +#include <linux/verification.h>
> >  
> >  /* Location of a reserved region to hold the crash kernel.
> >   */
> > @@ -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);
> > +#endif
> > +#endif
> >  int arch_kexec_locate_mem_hole(struct kexec_buf *kbuf);
> >  
> >  extern int kexec_add_buffer(struct kexec_buf *kbuf);
> > diff --git a/kernel/kexec_file.c b/kernel/kexec_file.c
> > index 3720435807eb..754885b96aab 100644
> > --- a/kernel/kexec_file.c
> > +++ b/kernel/kexec_file.c
> > @@ -165,6 +165,23 @@ void 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)
> > +{
> > +	int ret;
> > +
> > +	ret = verify_pefile_signature(kernel, kernel_len,
> > +				      VERIFY_USE_SECONDARY_KEYRING,
> > +				      VERIFYING_KEXEC_PE_SIGNATURE);
> > +	if (ret == -ENOKEY && IS_ENABLED(CONFIG_INTEGRITY_PLATFORM_KEYRING)) {
> > +		ret = verify_pefile_signature(kernel, kernel_len,
> > +					      VERIFY_USE_PLATFORM_KEYRING,
> > +					      VERIFYING_KEXEC_PE_SIGNATURE);
> > +	}
> > +	return ret;
> > +}
> > +#endif
> > +
> >  static int kexec_image_verify_sig(struct kimage *image, void *buf,
> >  		unsigned long buf_len)
> >  {
> > -- 
> > 2.35.3
> > 
>
Coiby Xu May 12, 2022, 4:33 a.m. UTC | #3
On Thu, May 12, 2022 at 11:52:09AM +0800, Baoquan He wrote:
>On 05/12/22 at 10:46am, Baoquan He wrote:
>> On 05/12/22 at 10:34am, 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.
>> >
>> > Note this patch is needed by a later patch so Cc it to the stable tree
>> > as well.
>>
>> This note should not be added in log.
>>
>> >
>> > Cc: kexec@lists.infradead.org
>> > Cc: keyrings@vger.kernel.org
>> > Cc: linux-security-module@vger.kernel.org
>> > Cc: stable@vger.kernel.org # 34d5960af253: kexec: clean up arch_kexec_kernel_verify_sig
>
>Hold on, should we CC stable when it's not fixing an issue?
>
>Hi Coiby,

Hi Baoquan,

>
>Just to make clear , is this patch fixing an issue, or it's just an
>preparation for later patch's use?
>
>Or I should ask in another way, any problem is solved with this patch?

At least it doesn't fix an issue that satisfy the criteria listed in 
https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html

>
>
>> > Reviewed-by: Michal Suchanek <msuchanek@suse.de>
>> > Signed-off-by: Coiby Xu <coxu@redhat.com>
>> > ---
>>
>> You can put the note here, it won't be added to commit log when merged.
>> Maybe it can be removed when merged.

Thanks for the suggestion! Shall I send a version to fix this problem or
can I just bother the maintainer to remove it?


>>
>> Otherwise, LGTM
>>
>> Acked-by: Baoquan He <bhe@redhat.com>
>>
>> >  arch/x86/kernel/kexec-bzimage64.c | 20 +-------------------
>> >  include/linux/kexec.h             |  7 +++++++
>> >  kernel/kexec_file.c               | 17 +++++++++++++++++
>> >  3 files changed, 25 insertions(+), 19 deletions(-)
>> >
>> > diff --git a/arch/x86/kernel/kexec-bzimage64.c b/arch/x86/kernel/kexec-bzimage64.c
>> > index 170d0fd68b1f..f299b48f9c9f 100644
>> > --- a/arch/x86/kernel/kexec-bzimage64.c
>> > +++ b/arch/x86/kernel/kexec-bzimage64.c
>> > @@ -17,7 +17,6 @@
>> >  #include <linux/kernel.h>
>> >  #include <linux/mm.h>
>> >  #include <linux/efi.h>
>> > -#include <linux/verification.h>
>> >
>> >  #include <asm/bootparam.h>
>> >  #include <asm/setup.h>
>> > @@ -528,28 +527,11 @@ static int bzImage64_cleanup(void *loader_data)
>> >  	return 0;
>> >  }
>> >
>> > -#ifdef CONFIG_KEXEC_BZIMAGE_VERIFY_SIG
>> > -static int bzImage64_verify_sig(const char *kernel, unsigned long kernel_len)
>> > -{
>> > -	int ret;
>> > -
>> > -	ret = verify_pefile_signature(kernel, kernel_len,
>> > -				      VERIFY_USE_SECONDARY_KEYRING,
>> > -				      VERIFYING_KEXEC_PE_SIGNATURE);
>> > -	if (ret == -ENOKEY && IS_ENABLED(CONFIG_INTEGRITY_PLATFORM_KEYRING)) {
>> > -		ret = verify_pefile_signature(kernel, kernel_len,
>> > -					      VERIFY_USE_PLATFORM_KEYRING,
>> > -					      VERIFYING_KEXEC_PE_SIGNATURE);
>> > -	}
>> > -	return ret;
>> > -}
>> > -#endif
>> > -
>> >  const struct kexec_file_ops kexec_bzImage64_ops = {
>> >  	.probe = bzImage64_probe,
>> >  	.load = bzImage64_load,
>> >  	.cleanup = bzImage64_cleanup,
>> >  #ifdef CONFIG_KEXEC_BZIMAGE_VERIFY_SIG
>> > -	.verify_sig = bzImage64_verify_sig,
>> > +	.verify_sig = kexec_kernel_verify_pe_sig,
>> >  #endif
>> >  };
>> > diff --git a/include/linux/kexec.h b/include/linux/kexec.h
>> > index 413235c6c797..da83abfc628b 100644
>> > --- a/include/linux/kexec.h
>> > +++ b/include/linux/kexec.h
>> > @@ -19,6 +19,7 @@
>> >  #include <asm/io.h>
>> >
>> >  #include <uapi/linux/kexec.h>
>> > +#include <linux/verification.h>
>> >
>> >  /* Location of a reserved region to hold the crash kernel.
>> >   */
>> > @@ -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);
>> > +#endif
>> > +#endif
>> >  int arch_kexec_locate_mem_hole(struct kexec_buf *kbuf);
>> >
>> >  extern int kexec_add_buffer(struct kexec_buf *kbuf);
>> > diff --git a/kernel/kexec_file.c b/kernel/kexec_file.c
>> > index 3720435807eb..754885b96aab 100644
>> > --- a/kernel/kexec_file.c
>> > +++ b/kernel/kexec_file.c
>> > @@ -165,6 +165,23 @@ void 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)
>> > +{
>> > +	int ret;
>> > +
>> > +	ret = verify_pefile_signature(kernel, kernel_len,
>> > +				      VERIFY_USE_SECONDARY_KEYRING,
>> > +				      VERIFYING_KEXEC_PE_SIGNATURE);
>> > +	if (ret == -ENOKEY && IS_ENABLED(CONFIG_INTEGRITY_PLATFORM_KEYRING)) {
>> > +		ret = verify_pefile_signature(kernel, kernel_len,
>> > +					      VERIFY_USE_PLATFORM_KEYRING,
>> > +					      VERIFYING_KEXEC_PE_SIGNATURE);
>> > +	}
>> > +	return ret;
>> > +}
>> > +#endif
>> > +
>> >  static int kexec_image_verify_sig(struct kimage *image, void *buf,
>> >  		unsigned long buf_len)
>> >  {
>> > --
>> > 2.35.3
>> >
>>
>
Baoquan He May 12, 2022, 6:22 a.m. UTC | #4
On 05/12/22 at 12:33pm, Coiby Xu wrote:
> On Thu, May 12, 2022 at 11:52:09AM +0800, Baoquan He wrote:
> > On 05/12/22 at 10:46am, Baoquan He wrote:
> > > On 05/12/22 at 10:34am, 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.
> > > >
> > > > Note this patch is needed by a later patch so Cc it to the stable tree
> > > > as well.
> > > 
> > > This note should not be added in log.
> > > 
> > > >
> > > > Cc: kexec@lists.infradead.org
> > > > Cc: keyrings@vger.kernel.org
> > > > Cc: linux-security-module@vger.kernel.org
> > > > Cc: stable@vger.kernel.org # 34d5960af253: kexec: clean up arch_kexec_kernel_verify_sig
> > 
> > Hold on, should we CC stable when it's not fixing an issue?
> > 
> > Hi Coiby,
> 
> Hi Baoquan,
> 
> > 
> > Just to make clear , is this patch fixing an issue, or it's just an
> > preparation for later patch's use?
> > 
> > Or I should ask in another way, any problem is solved with this patch?
> 
> At least it doesn't fix an issue that satisfy the criteria listed in
> https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html

Then it should not be CC-ed to stable.

> 
> > 
> > 
> > > > Reviewed-by: Michal Suchanek <msuchanek@suse.de>
> > > > Signed-off-by: Coiby Xu <coxu@redhat.com>
> > > > ---
> > > 
> > > You can put the note here, it won't be added to commit log when merged.
> > > Maybe it can be removed when merged.
> 
> Thanks for the suggestion! Shall I send a version to fix this problem or
> can I just bother the maintainer to remove it?

Better send a clean one, it will save maintainer's time, they can pick
it directly.

> 
> 
> > > 
> > > Otherwise, LGTM
> > > 
> > > Acked-by: Baoquan He <bhe@redhat.com>
> > > 
> > > >  arch/x86/kernel/kexec-bzimage64.c | 20 +-------------------
> > > >  include/linux/kexec.h             |  7 +++++++
> > > >  kernel/kexec_file.c               | 17 +++++++++++++++++
> > > >  3 files changed, 25 insertions(+), 19 deletions(-)
> > > >
> > > > diff --git a/arch/x86/kernel/kexec-bzimage64.c b/arch/x86/kernel/kexec-bzimage64.c
> > > > index 170d0fd68b1f..f299b48f9c9f 100644
> > > > --- a/arch/x86/kernel/kexec-bzimage64.c
> > > > +++ b/arch/x86/kernel/kexec-bzimage64.c
> > > > @@ -17,7 +17,6 @@
> > > >  #include <linux/kernel.h>
> > > >  #include <linux/mm.h>
> > > >  #include <linux/efi.h>
> > > > -#include <linux/verification.h>
> > > >
> > > >  #include <asm/bootparam.h>
> > > >  #include <asm/setup.h>
> > > > @@ -528,28 +527,11 @@ static int bzImage64_cleanup(void *loader_data)
> > > >  	return 0;
> > > >  }
> > > >
> > > > -#ifdef CONFIG_KEXEC_BZIMAGE_VERIFY_SIG
> > > > -static int bzImage64_verify_sig(const char *kernel, unsigned long kernel_len)
> > > > -{
> > > > -	int ret;
> > > > -
> > > > -	ret = verify_pefile_signature(kernel, kernel_len,
> > > > -				      VERIFY_USE_SECONDARY_KEYRING,
> > > > -				      VERIFYING_KEXEC_PE_SIGNATURE);
> > > > -	if (ret == -ENOKEY && IS_ENABLED(CONFIG_INTEGRITY_PLATFORM_KEYRING)) {
> > > > -		ret = verify_pefile_signature(kernel, kernel_len,
> > > > -					      VERIFY_USE_PLATFORM_KEYRING,
> > > > -					      VERIFYING_KEXEC_PE_SIGNATURE);
> > > > -	}
> > > > -	return ret;
> > > > -}
> > > > -#endif
> > > > -
> > > >  const struct kexec_file_ops kexec_bzImage64_ops = {
> > > >  	.probe = bzImage64_probe,
> > > >  	.load = bzImage64_load,
> > > >  	.cleanup = bzImage64_cleanup,
> > > >  #ifdef CONFIG_KEXEC_BZIMAGE_VERIFY_SIG
> > > > -	.verify_sig = bzImage64_verify_sig,
> > > > +	.verify_sig = kexec_kernel_verify_pe_sig,
> > > >  #endif
> > > >  };
> > > > diff --git a/include/linux/kexec.h b/include/linux/kexec.h
> > > > index 413235c6c797..da83abfc628b 100644
> > > > --- a/include/linux/kexec.h
> > > > +++ b/include/linux/kexec.h
> > > > @@ -19,6 +19,7 @@
> > > >  #include <asm/io.h>
> > > >
> > > >  #include <uapi/linux/kexec.h>
> > > > +#include <linux/verification.h>
> > > >
> > > >  /* Location of a reserved region to hold the crash kernel.
> > > >   */
> > > > @@ -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);
> > > > +#endif
> > > > +#endif
> > > >  int arch_kexec_locate_mem_hole(struct kexec_buf *kbuf);
> > > >
> > > >  extern int kexec_add_buffer(struct kexec_buf *kbuf);
> > > > diff --git a/kernel/kexec_file.c b/kernel/kexec_file.c
> > > > index 3720435807eb..754885b96aab 100644
> > > > --- a/kernel/kexec_file.c
> > > > +++ b/kernel/kexec_file.c
> > > > @@ -165,6 +165,23 @@ void 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)
> > > > +{
> > > > +	int ret;
> > > > +
> > > > +	ret = verify_pefile_signature(kernel, kernel_len,
> > > > +				      VERIFY_USE_SECONDARY_KEYRING,
> > > > +				      VERIFYING_KEXEC_PE_SIGNATURE);
> > > > +	if (ret == -ENOKEY && IS_ENABLED(CONFIG_INTEGRITY_PLATFORM_KEYRING)) {
> > > > +		ret = verify_pefile_signature(kernel, kernel_len,
> > > > +					      VERIFY_USE_PLATFORM_KEYRING,
> > > > +					      VERIFYING_KEXEC_PE_SIGNATURE);
> > > > +	}
> > > > +	return ret;
> > > > +}
> > > > +#endif
> > > > +
> > > >  static int kexec_image_verify_sig(struct kimage *image, void *buf,
> > > >  		unsigned long buf_len)
> > > >  {
> > > > --
> > > > 2.35.3
> > > >
> > > 
> > 
> 
> -- 
> Best regards,
> Coiby
>
Coiby Xu May 12, 2022, 6:54 a.m. UTC | #5
On Thu, May 12, 2022 at 02:22:57PM +0800, Baoquan He wrote:
>On 05/12/22 at 12:33pm, Coiby Xu wrote:
[...]
>> > Just to make clear , is this patch fixing an issue, or it's just an
>> > preparation for later patch's use?
>> >
>> > Or I should ask in another way, any problem is solved with this patch?
>>
>> At least it doesn't fix an issue that satisfy the criteria listed in
>> https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html
>
>Then it should not be CC-ed to stable.

OK, I'll drop "CC:" in next version.

>
>>
>> >
>> >
>> > > > Reviewed-by: Michal Suchanek <msuchanek@suse.de>
>> > > > Signed-off-by: Coiby Xu <coxu@redhat.com>
>> > > > ---
>> > >
>> > > You can put the note here, it won't be added to commit log when merged.
>> > > Maybe it can be removed when merged.
>>
>> Thanks for the suggestion! Shall I send a version to fix this problem or
>> can I just bother the maintainer to remove it?
>
>Better send a clean one, it will save maintainer's time, they can pick
>it directly.

Thanks for the confirmation! I'll simply delete them because,
1. these notes don't make sense anymore if I don't CC the patches to the stable
    tree 
2. I've explained in the cover letter the first two patches
    are the prerequisite patches for the 3rd patch.
diff mbox series

Patch

diff --git a/arch/x86/kernel/kexec-bzimage64.c b/arch/x86/kernel/kexec-bzimage64.c
index 170d0fd68b1f..f299b48f9c9f 100644
--- a/arch/x86/kernel/kexec-bzimage64.c
+++ b/arch/x86/kernel/kexec-bzimage64.c
@@ -17,7 +17,6 @@ 
 #include <linux/kernel.h>
 #include <linux/mm.h>
 #include <linux/efi.h>
-#include <linux/verification.h>
 
 #include <asm/bootparam.h>
 #include <asm/setup.h>
@@ -528,28 +527,11 @@  static int bzImage64_cleanup(void *loader_data)
 	return 0;
 }
 
-#ifdef CONFIG_KEXEC_BZIMAGE_VERIFY_SIG
-static int bzImage64_verify_sig(const char *kernel, unsigned long kernel_len)
-{
-	int ret;
-
-	ret = verify_pefile_signature(kernel, kernel_len,
-				      VERIFY_USE_SECONDARY_KEYRING,
-				      VERIFYING_KEXEC_PE_SIGNATURE);
-	if (ret == -ENOKEY && IS_ENABLED(CONFIG_INTEGRITY_PLATFORM_KEYRING)) {
-		ret = verify_pefile_signature(kernel, kernel_len,
-					      VERIFY_USE_PLATFORM_KEYRING,
-					      VERIFYING_KEXEC_PE_SIGNATURE);
-	}
-	return ret;
-}
-#endif
-
 const struct kexec_file_ops kexec_bzImage64_ops = {
 	.probe = bzImage64_probe,
 	.load = bzImage64_load,
 	.cleanup = bzImage64_cleanup,
 #ifdef CONFIG_KEXEC_BZIMAGE_VERIFY_SIG
-	.verify_sig = bzImage64_verify_sig,
+	.verify_sig = kexec_kernel_verify_pe_sig,
 #endif
 };
diff --git a/include/linux/kexec.h b/include/linux/kexec.h
index 413235c6c797..da83abfc628b 100644
--- a/include/linux/kexec.h
+++ b/include/linux/kexec.h
@@ -19,6 +19,7 @@ 
 #include <asm/io.h>
 
 #include <uapi/linux/kexec.h>
+#include <linux/verification.h>
 
 /* Location of a reserved region to hold the crash kernel.
  */
@@ -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);
+#endif
+#endif
 int arch_kexec_locate_mem_hole(struct kexec_buf *kbuf);
 
 extern int kexec_add_buffer(struct kexec_buf *kbuf);
diff --git a/kernel/kexec_file.c b/kernel/kexec_file.c
index 3720435807eb..754885b96aab 100644
--- a/kernel/kexec_file.c
+++ b/kernel/kexec_file.c
@@ -165,6 +165,23 @@  void 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)
+{
+	int ret;
+
+	ret = verify_pefile_signature(kernel, kernel_len,
+				      VERIFY_USE_SECONDARY_KEYRING,
+				      VERIFYING_KEXEC_PE_SIGNATURE);
+	if (ret == -ENOKEY && IS_ENABLED(CONFIG_INTEGRITY_PLATFORM_KEYRING)) {
+		ret = verify_pefile_signature(kernel, kernel_len,
+					      VERIFY_USE_PLATFORM_KEYRING,
+					      VERIFYING_KEXEC_PE_SIGNATURE);
+	}
+	return ret;
+}
+#endif
+
 static int kexec_image_verify_sig(struct kimage *image, void *buf,
 		unsigned long buf_len)
 {