| Message ID | 20220414014344.228523-4-coxu@redhat.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | use more system keyrings to verify arm64 and s390 kexec kernel image signature | expand |
On 04/14/22 at 09:43am, Coiby Xu wrote: > Currently, a problem faced by arm64 is if a kernel image is signed by a > MOK key, loading it via the kexec_file_load() system call would be > rejected with the error "Lockdown: kexec: kexec of unsigned images is > restricted; see man kernel_lockdown.7". > > This happens because image_verify_sig uses only the primary keyring that > contains only kernel built-in keys to verify the kexec image. > > This patch allows to verify arm64 kernel image signature using not only > .builtin_trusted_keys but also .platform and .secondary_trusted_keys > keyring. > > Fixes: 732b7b93d849 ("arm64: kexec_file: add kernel signature verification support") Cc stable? Otherwise, LGTM, Acked-by: Baoquan He <bhe@redhat.com> > Cc: kexec@lists.infradead.org > Cc: keyrings@vger.kernel.org > Cc: linux-security-module@vger.kernel.org > Cc: stable@kernel.org > Co-developed-by: Michal Suchanek <msuchanek@suse.de> > Signed-off-by: Michal Suchanek <msuchanek@suse.de> > Acked-by: Will Deacon <will@kernel.org> > Signed-off-by: Coiby Xu <coxu@redhat.com> > --- > arch/arm64/kernel/kexec_image.c | 11 +---------- > 1 file changed, 1 insertion(+), 10 deletions(-) > > diff --git a/arch/arm64/kernel/kexec_image.c b/arch/arm64/kernel/kexec_image.c > index 9ec34690e255..5ed6a585f21f 100644 > --- a/arch/arm64/kernel/kexec_image.c > +++ b/arch/arm64/kernel/kexec_image.c > @@ -14,7 +14,6 @@ > #include <linux/kexec.h> > #include <linux/pe.h> > #include <linux/string.h> > -#include <linux/verification.h> > #include <asm/byteorder.h> > #include <asm/cpufeature.h> > #include <asm/image.h> > @@ -130,18 +129,10 @@ static void *image_load(struct kimage *image, > return NULL; > } > > -#ifdef CONFIG_KEXEC_IMAGE_VERIFY_SIG > -static int image_verify_sig(const char *kernel, unsigned long kernel_len) > -{ > - return verify_pefile_signature(kernel, kernel_len, NULL, > - VERIFYING_KEXEC_PE_SIGNATURE); > -} > -#endif > - > const struct kexec_file_ops kexec_image_ops = { > .probe = image_probe, > .load = image_load, > #ifdef CONFIG_KEXEC_IMAGE_VERIFY_SIG > - .verify_sig = image_verify_sig, > + .verify_sig = kexec_kernel_verify_pe_sig, > #endif > }; > -- > 2.34.1 > >
On Mon, Apr 18, 2022 at 10:14:31AM +0800, Baoquan He wrote: >On 04/14/22 at 09:43am, Coiby Xu wrote: >> Currently, a problem faced by arm64 is if a kernel image is signed by a >> MOK key, loading it via the kexec_file_load() system call would be >> rejected with the error "Lockdown: kexec: kexec of unsigned images is >> restricted; see man kernel_lockdown.7". >> >> This happens because image_verify_sig uses only the primary keyring that >> contains only kernel built-in keys to verify the kexec image. >> >> This patch allows to verify arm64 kernel image signature using not only >> .builtin_trusted_keys but also .platform and .secondary_trusted_keys >> keyring. >> >> Fixes: 732b7b93d849 ("arm64: kexec_file: add kernel signature verification support") > >Cc stable? Thanks for the reminder! I've added "Cc stable@kernel.org". But it seems I should Cc stable@vger.kernel.org instead. > >Otherwise, LGTM, > >Acked-by: Baoquan He <bhe@redhat.com> > >> Cc: kexec@lists.infradead.org >> Cc: keyrings@vger.kernel.org >> Cc: linux-security-module@vger.kernel.org >> Cc: stable@kernel.org >> Co-developed-by: Michal Suchanek <msuchanek@suse.de> >> Signed-off-by: Michal Suchanek <msuchanek@suse.de> >> Acked-by: Will Deacon <will@kernel.org> >> Signed-off-by: Coiby Xu <coxu@redhat.com> >> --- >> arch/arm64/kernel/kexec_image.c | 11 +---------- >> 1 file changed, 1 insertion(+), 10 deletions(-) >> >> diff --git a/arch/arm64/kernel/kexec_image.c b/arch/arm64/kernel/kexec_image.c >> index 9ec34690e255..5ed6a585f21f 100644 >> --- a/arch/arm64/kernel/kexec_image.c >> +++ b/arch/arm64/kernel/kexec_image.c >> @@ -14,7 +14,6 @@ >> #include <linux/kexec.h> >> #include <linux/pe.h> >> #include <linux/string.h> >> -#include <linux/verification.h> >> #include <asm/byteorder.h> >> #include <asm/cpufeature.h> >> #include <asm/image.h> >> @@ -130,18 +129,10 @@ static void *image_load(struct kimage *image, >> return NULL; >> } >> >> -#ifdef CONFIG_KEXEC_IMAGE_VERIFY_SIG >> -static int image_verify_sig(const char *kernel, unsigned long kernel_len) >> -{ >> - return verify_pefile_signature(kernel, kernel_len, NULL, >> - VERIFYING_KEXEC_PE_SIGNATURE); >> -} >> -#endif >> - >> const struct kexec_file_ops kexec_image_ops = { >> .probe = image_probe, >> .load = image_load, >> #ifdef CONFIG_KEXEC_IMAGE_VERIFY_SIG >> - .verify_sig = image_verify_sig, >> + .verify_sig = kexec_kernel_verify_pe_sig, >> #endif >> }; >> -- >> 2.34.1 >> >> >
diff --git a/arch/arm64/kernel/kexec_image.c b/arch/arm64/kernel/kexec_image.c index 9ec34690e255..5ed6a585f21f 100644 --- a/arch/arm64/kernel/kexec_image.c +++ b/arch/arm64/kernel/kexec_image.c @@ -14,7 +14,6 @@ #include <linux/kexec.h> #include <linux/pe.h> #include <linux/string.h> -#include <linux/verification.h> #include <asm/byteorder.h> #include <asm/cpufeature.h> #include <asm/image.h> @@ -130,18 +129,10 @@ static void *image_load(struct kimage *image, return NULL; } -#ifdef CONFIG_KEXEC_IMAGE_VERIFY_SIG -static int image_verify_sig(const char *kernel, unsigned long kernel_len) -{ - return verify_pefile_signature(kernel, kernel_len, NULL, - VERIFYING_KEXEC_PE_SIGNATURE); -} -#endif - const struct kexec_file_ops kexec_image_ops = { .probe = image_probe, .load = image_load, #ifdef CONFIG_KEXEC_IMAGE_VERIFY_SIG - .verify_sig = image_verify_sig, + .verify_sig = kexec_kernel_verify_pe_sig, #endif };
Currently, a problem faced by arm64 is if a kernel image is signed by a MOK key, loading it via the kexec_file_load() system call would be rejected with the error "Lockdown: kexec: kexec of unsigned images is restricted; see man kernel_lockdown.7". This happens because image_verify_sig uses only the primary keyring that contains only kernel built-in keys to verify the kexec image. This patch allows to verify arm64 kernel image signature using not only .builtin_trusted_keys but also .platform and .secondary_trusted_keys keyring. Fixes: 732b7b93d849 ("arm64: kexec_file: add kernel signature verification support") Cc: kexec@lists.infradead.org Cc: keyrings@vger.kernel.org Cc: linux-security-module@vger.kernel.org Cc: stable@kernel.org Co-developed-by: Michal Suchanek <msuchanek@suse.de> Signed-off-by: Michal Suchanek <msuchanek@suse.de> Acked-by: Will Deacon <will@kernel.org> Signed-off-by: Coiby Xu <coxu@redhat.com> --- arch/arm64/kernel/kexec_image.c | 11 +---------- 1 file changed, 1 insertion(+), 10 deletions(-)