diff options
| -rw-r--r-- | kexec/arch/arm64/image-header.h | 1 | ||||
| -rw-r--r-- | kexec/arch/arm64/kexec-vmlinuz-arm64.c | 110 |
2 files changed, 111 insertions, 0 deletions
diff --git a/kexec/arch/arm64/image-header.h b/kexec/arch/arm64/image-header.h index 158d4116..26bb02fb 100644 --- a/kexec/arch/arm64/image-header.h +++ b/kexec/arch/arm64/image-header.h @@ -37,6 +37,7 @@ struct arm64_image_header { static const uint8_t arm64_image_magic[4] = {'A', 'R', 'M', 0x64U}; static const uint8_t arm64_image_pe_sig[2] = {'M', 'Z'}; +static const uint8_t arm64_pe_machtype[6] = {'P','E', 0x0, 0x0, 0x64, 0xAA}; static const uint64_t arm64_image_flag_be = (1UL << 0); static const uint64_t arm64_image_flag_page_size = (3UL << 1); static const uint64_t arm64_image_flag_placement = (1UL << 3); diff --git a/kexec/arch/arm64/kexec-vmlinuz-arm64.c b/kexec/arch/arm64/kexec-vmlinuz-arm64.c new file mode 100644 index 00000000..c0ee47c8 --- /dev/null +++ b/kexec/arch/arm64/kexec-vmlinuz-arm64.c @@ -0,0 +1,110 @@ +/* + * ARM64 PE compressed Image (vmlinuz, ZBOOT) support. + * + * Several distros use 'make zinstall' rule inside + * 'arch/arm64/boot/Makefile' to install the arm64 + * ZBOOT compressed file inside the boot destination + * directory (for e.g. /boot). + * + * Currently we cannot use kexec_file_load() to load vmlinuz + * PE images that self decompress. + * + * To support ZBOOT, we should: + * a). Copy the compressed contents of vmlinuz to a temporary file. + * b). Decompress (gunzip-decompress) the contents inside the + * temporary file. + * c). Validate the resulting image and write it back to the + * temporary file. + * d). Pass the 'fd' of the temporary file to the kernel space. + * + * Note this, module doesn't provide a _load() function instead + * relying on image_arm64_load() to load the resulting decompressed + * image. + * + * So basically the kernel space still gets a decompressed + * kernel image to load via kexec-tools. + */ + +#define _GNU_SOURCE +#include <fcntl.h> +#include <unistd.h> +#include <stdlib.h> +#include "kexec-arm64.h" +#include <kexec-pe-zboot.h> +#include "arch/options.h" + +static int kernel_fd = -1; + +/* Returns: + * -1 : in case of error/invalid format (not a valid PE+compressed ZBOOT format. + */ +int pez_arm64_probe(const char *kernel_buf, off_t kernel_size) +{ + int ret = -1; + const struct arm64_image_header *h; + char *buf; + off_t buf_sz; + + buf = (char *)kernel_buf; + buf_sz = kernel_size; + if (!buf) + return -1; + h = (const struct arm64_image_header *)buf; + + dbgprintf("%s: PROBE.\n", __func__); + if (buf_sz < sizeof(struct arm64_image_header)) { + dbgprintf("%s: Not large enough to be a PE image.\n", __func__); + return -1; + } + if (!arm64_header_check_pe_sig(h)) { + dbgprintf("%s: Not an PE image.\n", __func__); + return -1; + } + + if (buf_sz < sizeof(struct arm64_image_header) + h->pe_header) { + dbgprintf("%s: PE image offset larger than image.\n", __func__); + return -1; + } + + if (memcmp(&buf[h->pe_header], + arm64_pe_machtype, sizeof(arm64_pe_machtype))) { + dbgprintf("%s: PE header doesn't match machine type.\n", __func__); + return -1; + } + + ret = pez_prepare(buf, buf_sz, &kernel_fd); + + if (!ret) { + /* validate the arm64 specific header */ + struct arm64_image_header hdr_check; + if (read(kernel_fd, &hdr_check, sizeof(hdr_check)) != sizeof(hdr_check)) + goto bad_header; + + lseek(kernel_fd, 0, SEEK_SET); + + if (!arm64_header_check_magic(&hdr_check)) { + dbgprintf("%s: Bad arm64 image header.\n", __func__); + goto bad_header; + } + } + + return ret; +bad_header: + close(kernel_fd); + free(buf); + return -1; +} + +int pez_arm64_load(int argc, char **argv, const char *buf, off_t len, + struct kexec_info *info) +{ + info->kernel_fd = kernel_fd; + return image_arm64_load(argc, argv, buf, len, info); +} + +void pez_arm64_usage(void) +{ + printf( +" An ARM64 vmlinuz, PE image of a compressed, little endian.\n" +" kernel, built with ZBOOT enabled.\n\n"); +} |