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author | Linus Torvalds <torvalds@linux-foundation.org> | 2011-10-28 05:29:07 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-10-28 05:29:07 -0700 |
commit | 8e6d539e0fd0c2124a20a207da70f2af7a9ae52c (patch) | |
tree | 73016c1bdb5005125cdb5d60d48f73ab4300be64 /drivers/char/random.c | |
parent | 8237eb946a1a23c600fb289cf8dd3b399b10604e (diff) | |
parent | 49d859d78c5aeb998b6936fcb5f288f78d713489 (diff) | |
download | linux-8e6d539e0fd0c2124a20a207da70f2af7a9ae52c.tar.gz linux-8e6d539e0fd0c2124a20a207da70f2af7a9ae52c.tar.bz2 linux-8e6d539e0fd0c2124a20a207da70f2af7a9ae52c.zip |
Merge branch 'x86-rdrand-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
* 'x86-rdrand-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86, random: Verify RDRAND functionality and allow it to be disabled
x86, random: Architectural inlines to get random integers with RDRAND
random: Add support for architectural random hooks
Fix up trivial conflicts in drivers/char/random.c: the architectural
random hooks touched "get_random_int()" that was simplified to use MD5
and not do the keyptr thing any more (see commit 6e5714eaf77d: "net:
Compute protocol sequence numbers and fragment IDs using MD5").
Diffstat (limited to 'drivers/char/random.c')
-rw-r--r-- | drivers/char/random.c | 23 |
1 files changed, 21 insertions, 2 deletions
diff --git a/drivers/char/random.c b/drivers/char/random.c index c35a785005b0..63e19ba56bbe 100644 --- a/drivers/char/random.c +++ b/drivers/char/random.c @@ -932,7 +932,21 @@ static ssize_t extract_entropy_user(struct entropy_store *r, void __user *buf, */ void get_random_bytes(void *buf, int nbytes) { - extract_entropy(&nonblocking_pool, buf, nbytes, 0, 0); + char *p = buf; + + while (nbytes) { + unsigned long v; + int chunk = min(nbytes, (int)sizeof(unsigned long)); + + if (!arch_get_random_long(&v)) + break; + + memcpy(buf, &v, chunk); + p += chunk; + nbytes -= chunk; + } + + extract_entropy(&nonblocking_pool, p, nbytes, 0, 0); } EXPORT_SYMBOL(get_random_bytes); @@ -1318,9 +1332,14 @@ late_initcall(random_int_secret_init); DEFINE_PER_CPU(__u32 [MD5_DIGEST_WORDS], get_random_int_hash); unsigned int get_random_int(void) { - __u32 *hash = get_cpu_var(get_random_int_hash); + __u32 *hash; unsigned int ret; + if (arch_get_random_int(&ret)) + return ret; + + hash = get_cpu_var(get_random_int_hash); + hash[0] += current->pid + jiffies + get_cycles(); md5_transform(hash, random_int_secret); ret = hash[0]; |