On 09/30/21 at 08:49pm, Dave Young wrote:
> Hi Coiby,
> On 09/27/21 at 08:50am, Coiby Xu wrote:
> > From: Coiby Xu <coxu@xxxxxxxxxx>
> >
> > The code in bzImage64_verify_sig could make use of system keyrings including
> > .buitin_trusted_keys, .secondary_trusted_keys and .platform keyring to verify
> > signed kernel image as PE file. Move it to a public function.
> >
> > Signed-off-by: Coiby Xu <coiby.xu@xxxxxxxxx>
> > ---
> > arch/x86/kernel/kexec-bzimage64.c | 13 +------------
> > include/linux/kexec.h | 3 +++
> > kernel/kexec_file.c | 15 +++++++++++++++
> > 3 files changed, 19 insertions(+), 12 deletions(-)
> >
> > diff --git a/arch/x86/kernel/kexec-bzimage64.c b/arch/x86/kernel/kexec-bzimage64.c
> > index 170d0fd68b1f..4136dd3be5a9 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>
> > @@ -531,17 +530,7 @@ static int bzImage64_cleanup(void *loader_data)
> > #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;
> > + return arch_kexec_kernel_verify_pe_sig(kernel, kernel_len);
> > }
> > #endif
> >
> > diff --git a/include/linux/kexec.h b/include/linux/kexec.h
> > index 0c994ae37729..d45f32336dbe 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>
> >
> > #ifdef CONFIG_KEXEC_CORE
> > #include <linux/list.h>
> > @@ -199,6 +200,8 @@ int arch_kimage_file_post_load_cleanup(struct kimage *image);
> > #ifdef CONFIG_KEXEC_SIG
> > int arch_kexec_kernel_verify_sig(struct kimage *image, void *buf,
> > unsigned long buf_len);
> > +int arch_kexec_kernel_verify_pe_sig(const char *kernel,
> > + unsigned long kernel_len);
> > #endif
> > int arch_kexec_locate_mem_hole(struct kexec_buf *kbuf);
> >
> > diff --git a/kernel/kexec_file.c b/kernel/kexec_file.c
> > index 33400ff051a8..85ed6984ad8f 100644
> > --- a/kernel/kexec_file.c
> > +++ b/kernel/kexec_file.c
> > @@ -106,6 +106,21 @@ int __weak arch_kexec_kernel_verify_sig(struct kimage *image, void *buf,
> > {
> > return kexec_image_verify_sig_default(image, buf, buf_len);
> > }
> > +
> > +int arch_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;
> > +}
>
> Since the function is moved as generic code, the kconfig option
> CONFIG_KEXEC_BZIMAGE_VERIFY_SIG can be removed.
>
> Instead a CONFIG_KEXEC_PEFILE_VERIFY_SIG can be added so that it does
> not need to be compiled for only platform which support UEFI pefile
Fix the sick sentence: I means only to compile for x86_64 and arm64..
> signature verification. And the related arch kexec_file kconfig can
> just select it.
>
> Coiby, can you try above?
>
> > #endif
> >
> > /*
> > --
> > 2.33.0
> >
> >
> > _______________________________________________
> > kexec mailing list
> > kexec@xxxxxxxxxxxxxxxxxxx
> > http://lists.infradead.org/mailman/listinfo/kexec
> >
> >
>
> Thanks
> Dave
>
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