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kexec, KEYS: make the code in bzImage64_verify_sig generic 

commit c903dae894 upstream.

commit 278311e417 ("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 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.

Cc: kexec@lists.infradead.org
Cc: keyrings@vger.kernel.org
Cc: linux-security-module@vger.kernel.org
Reviewed-by: Michal Suchanek <msuchanek@suse.de>
Signed-off-by: Coiby Xu <coxu@redhat.com>
Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Coiby Xu 2022-07-14 21:40:25 +08:00 committed by Greg Kroah-Hartman
parent 3efab6d817
commit 8fd872cddf
3 changed files with 25 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
arch/x86/kernel/kexec-bzimage64.c
View File

@ -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
};

7
include/linux/kexec.h
View File

@ -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.
*/
@ -212,6 +213,12 @@ static inline void *arch_kexec_kernel_image_load(struct kimage *image)
}
#endif
#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
extern int kexec_add_buffer(struct kexec_buf *kbuf);
int kexec_locate_mem_hole(struct kexec_buf *kbuf);

17
kernel/kexec_file.c
View File

@ -123,6 +123,23 @@ 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)
{