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arm64: kexec_file: add rng-seed support

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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>
This commit is contained in:
Hsin-Yi Wang
2019-08-23 14:24:52 +08:00
committed by Will Deacon
parent 428826f535
commit 7f591fa7a6
1 changed files with 17 additions and 1 deletions
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18
arch/arm64/kernel/machine_kexec_file.c
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@ -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