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authorLinus Torvalds <torvalds@linux-foundation.org>2014-08-06 08:16:24 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2014-08-06 08:16:24 -0700
commitf4f142ed4ef835709c7e6d12eaca10d190bcebed (patch)
treea0bc6850239fe3551bb67f5707bfef153ac437fe /include/uapi
parentbb2cbf5e9367d8598fecd0c48dead69560750223 (diff)
parente02b876597777ab26288dd2611a97b597d14d661 (diff)
downloadlinux-f4f142ed4ef835709c7e6d12eaca10d190bcebed.tar.bz2
Merge tag 'random_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/random
Pull randomness updates from Ted Ts'o: "Cleanups and bug fixes to /dev/random, add a new getrandom(2) system call, which is a superset of OpenBSD's getentropy(2) call, for use with userspace crypto libraries such as LibreSSL. Also add the ability to have a kernel thread to pull entropy from hardware rng devices into /dev/random" * tag 'random_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/random: hwrng: Pass entropy to add_hwgenerator_randomness() in bits, not bytes random: limit the contribution of the hw rng to at most half random: introduce getrandom(2) system call hw_random: fix sparse warning (NULL vs 0 for pointer) random: use registers from interrupted code for CPU's w/o a cycle counter hwrng: add per-device entropy derating hwrng: create filler thread random: add_hwgenerator_randomness() for feeding entropy from devices random: use an improved fast_mix() function random: clean up interrupt entropy accounting for archs w/o cycle counters random: only update the last_pulled time if we actually transferred entropy random: remove unneeded hash of a portion of the entropy pool random: always update the entropy pool under the spinlock
Diffstat (limited to 'include/uapi')
-rw-r--r--include/uapi/asm-generic/unistd.h4
-rw-r--r--include/uapi/linux/random.h9
2 files changed, 12 insertions, 1 deletions
diff --git a/include/uapi/asm-generic/unistd.h b/include/uapi/asm-generic/unistd.h
index 65acbf0e2867..f1afd607f043 100644
--- a/include/uapi/asm-generic/unistd.h
+++ b/include/uapi/asm-generic/unistd.h
@@ -701,9 +701,11 @@ __SYSCALL(__NR_sched_getattr, sys_sched_getattr)
__SYSCALL(__NR_renameat2, sys_renameat2)
#define __NR_seccomp 277
__SYSCALL(__NR_seccomp, sys_seccomp)
+#define __NR_getrandom 278
+__SYSCALL(__NR_getrandom, sys_getrandom)
#undef __NR_syscalls
-#define __NR_syscalls 278
+#define __NR_syscalls 279
/*
* All syscalls below here should go away really,
diff --git a/include/uapi/linux/random.h b/include/uapi/linux/random.h
index fff3528a078f..3f93d1695e7f 100644
--- a/include/uapi/linux/random.h
+++ b/include/uapi/linux/random.h
@@ -40,4 +40,13 @@ struct rand_pool_info {
__u32 buf[0];
};
+/*
+ * Flags for getrandom(2)
+ *
+ * GRND_NONBLOCK Don't block and return EAGAIN instead
+ * GRND_RANDOM Use the /dev/random pool instead of /dev/urandom
+ */
+#define GRND_NONBLOCK 0x0001
+#define GRND_RANDOM 0x0002
+
#endif /* _UAPI_LINUX_RANDOM_H */