Messages in this thread Patch in this message | | | From | Theodore Ts'o <> | Subject | [PATCH] random: use arch-specific RNG to initialize the entropy store | Date | Thu, 22 Dec 2011 16:28:01 -0500 |
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If there is an architecture-specific random number generator (such as RDRAND for Intel architectures), use it to initialize /dev/random's entropy stores. Even in the worst case, if RDRAND is something like AES(NSA_KEY, counter++), it won't hurt, and it will definitely help against any other adversaries.
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu> --- drivers/char/random.c | 6 ++++++ 1 files changed, 6 insertions(+), 0 deletions(-)
diff --git a/drivers/char/random.c b/drivers/char/random.c index 6035ab8..f10780a 100644 --- a/drivers/char/random.c +++ b/drivers/char/random.c @@ -961,6 +961,7 @@ EXPORT_SYMBOL(get_random_bytes); */ static void init_std_data(struct entropy_store *r) { + int i; ktime_t now; unsigned long flags; @@ -970,6 +971,11 @@ static void init_std_data(struct entropy_store *r) now = ktime_get_real(); mix_pool_bytes(r, &now, sizeof(now)); + for (i = r->poolinfo->poolwords; i; i--) { + if (!arch_get_random_long(&flags)) + break; + mix_pool_bytes(r, &flags, sizeof(flags)); + } mix_pool_bytes(r, utsname(), sizeof(*(utsname()))); } -- 1.7.8.11.gefc1f.dirty
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