diff options
| -rw-r--r-- | kexec/arch/i386/x86-linux-setup.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/kexec/arch/i386/x86-linux-setup.c b/kexec/arch/i386/x86-linux-setup.c index ab54a4ac..14263b08 100644 --- a/kexec/arch/i386/x86-linux-setup.c +++ b/kexec/arch/i386/x86-linux-setup.c @@ -24,6 +24,7 @@ #include <limits.h> #include <sys/types.h> #include <sys/stat.h> +#include <sys/random.h> #include <fcntl.h> #include <sys/ioctl.h> #include <linux/fb.h> @@ -544,6 +545,7 @@ struct setup_data { #define SETUP_DTB 2 #define SETUP_PCI 3 #define SETUP_EFI 4 +#define SETUP_RNG_SEED 9 uint32_t len; uint8_t data[0]; } __attribute__((packed)); @@ -824,6 +826,26 @@ static void setup_e820(struct kexec_info *info, struct x86_linux_param_header *r } } +static void setup_rng_seed(struct kexec_info *info, + struct x86_linux_param_header *real_mode) +{ + struct { + struct setup_data header; + uint8_t rng_seed[32]; + } *sd; + + sd = xmalloc(sizeof(*sd)); + sd->header.next = 0; + sd->header.len = sizeof(sd->rng_seed); + sd->header.type = SETUP_RNG_SEED; + + if (getrandom(sd->rng_seed, sizeof(sd->rng_seed), GRND_NONBLOCK) != + sizeof(sd->rng_seed)) + return; /* Not initialized, so don't pass a seed. */ + + add_setup_data(info, real_mode, &sd->header); +} + static int get_efi_mem_desc_version(struct x86_linux_param_header *real_mode) { @@ -923,6 +945,9 @@ void setup_linux_system_parameters(struct kexec_info *info, setup_e820(info, real_mode); + /* pass RNG seed */ + setup_rng_seed(info, real_mode); + /* fill the EDD information */ setup_edd_info(real_mode); |