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| author |   Hsin-Yi Wang <hsinyi@chromium.org> | 2019-08-23 14:24:52 +0800 |
|---|---|---|
| committer |   Will Deacon <will@kernel.org> | 2019-08-23 16:40:14 +0100 |
| commit | 7f591fa7a62d3a3f585fd4ba5c3e7b05f4b931be (patch) | |
| tree | 8eac50a84d3c69c237bf2a861094668dc9b0625c /arch/arm64/kernel/machine_kexec_file.c | |
| parent | fdt: add support for rng-seed (diff) | |
| download | linux-dev-7f591fa7a62d3a3f585fd4ba5c3e7b05f4b931be.tar.xz linux-dev-7f591fa7a62d3a3f585fd4ba5c3e7b05f4b931be.zip | |
arm64: kexec_file: add rng-seed support
Adding "rng-seed" to dtb. It's fine to add this property if original
fdt doesn't contain it. Since original seed will be wiped after
read, so use a default size 128 bytes here.
Signed-off-by: Hsin-Yi Wang <hsinyi@chromium.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to '')
| -rw-r--r-- | arch/arm64/kernel/machine_kexec_file.c | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/arch/arm64/kernel/machine_kexec_file.c b/arch/arm64/kernel/machine_kexec_file.c index 58871333737a..81b5baad97aa 100644 --- a/arch/arm64/kernel/machine_kexec_file.c +++ b/arch/arm64/kernel/machine_kexec_file.c @@ -27,6 +27,8 @@ #define FDT_PROP_INITRD_END "linux,initrd-end" #define FDT_PROP_BOOTARGS "bootargs" #define FDT_PROP_KASLR_SEED "kaslr-seed" +#define FDT_PROP_RNG_SEED "rng-seed" +#define RNG_SEED_SIZE 128 const struct kexec_file_ops * const kexec_file_loaders[] = { &kexec_image_ops, @@ -102,6 +104,19 @@ static int setup_dtb(struct kimage *image, FDT_PROP_KASLR_SEED); } + /* add rng-seed */ + if (rng_is_initialized()) { + u8 rng_seed[RNG_SEED_SIZE]; + get_random_bytes(rng_seed, RNG_SEED_SIZE); + ret = fdt_setprop(dtb, off, FDT_PROP_RNG_SEED, rng_seed, + RNG_SEED_SIZE); + if (ret) + goto out; + } else { + pr_notice("RNG is not initialised: omitting \"%s\" property\n", + FDT_PROP_RNG_SEED); + } + out: if (ret) return (ret == -FDT_ERR_NOSPACE) ? -ENOMEM : -EINVAL; @@ -110,7 +125,8 @@ out: } /* - * More space needed so that we can add initrd, bootargs and kaslr-seed. + * More space needed so that we can add initrd, bootargs, kaslr-seed, and + * rng-seed. */ #define DTB_EXTRA_SPACE 0x1000 |