Merge remote-tracking branch 'remotes/rth/tags/pull-rng-20190522' into staging

Introduce qemu_guest_getrandom.
Use qemu_guest_getrandom in aspeed, nrf51, bcm2835, exynos4210 rng devices.
Use qemu_guest_getrandom in target/ppc darn instruction.
Support ARMv8.5-RNG extension.
Support x86 RDRAND extension.

Acked-by: Daniel P. Berrangé <berrange@redhat.com>
Acked-by: Laurent Vivier <laurent@vivier.eu>

# gpg: Signature made Wed 22 May 2019 19:36:43 BST
# gpg:                using RSA key 7A481E78868B4DB6A85A05C064DF38E8AF7E215F
# gpg:                issuer "richard.henderson@linaro.org"
# gpg: Good signature from "Richard Henderson <richard.henderson@linaro.org>" [full]
# Primary key fingerprint: 7A48 1E78 868B 4DB6 A85A  05C0 64DF 38E8 AF7E 215F

* remotes/rth/tags/pull-rng-20190522: (25 commits)
  target/i386: Implement CPUID_EXT_RDRAND
  target/ppc: Use qemu_guest_getrandom for DARN
  target/ppc: Use gen_io_start/end around DARN
  target/arm: Implement ARMv8.5-RNG
  target/arm: Put all PAC keys into a structure
  hw/misc/exynos4210_rng: Use qemu_guest_getrandom
  hw/misc/bcm2835_rng: Use qemu_guest_getrandom_nofail
  hw/misc/nrf51_rng: Use qemu_guest_getrandom_nofail
  aspeed/scu: Use qemu_guest_getrandom_nofail
  linux-user: Remove srand call
  linux-user/aarch64: Use qemu_guest_getrandom for PAUTH keys
  linux-user: Use qemu_guest_getrandom_nofail for AT_RANDOM
  linux-user: Call qcrypto_init if not using -seed
  linux-user: Initialize pseudo-random seeds for all guest cpus
  cpus: Initialize pseudo-random seeds for all guest cpus
  util: Add qemu_guest_getrandom and associated routines
  ui/vnc: Use gcrypto_random_bytes for start_auth_vnc
  ui/vnc: Split out authentication_failed
  crypto: Change the qcrypto_random_bytes buffer type to void*
  crypto: Use getrandom for qcrypto_random_bytes
  ...

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 20 insertions, 13 deletions

diff --git a/linux-user/main.c b/linux-user/main.c
index 3d2230320b..689bcf436d 100644
--- a/linux-user/main.c
+++ b/linux-user/main.c
@@ -34,10 +34,12 @@
 #include "tcg.h"
 #include "qemu/timer.h"
 #include "qemu/envlist.h"
+#include "qemu/guest-random.h"
 #include "elf.h"
 #include "trace/control.h"
 #include "target_elf.h"
 #include "cpu_loop-common.h"
+#include "crypto/init.h"
 
 char *exec_path;
 
@@ -48,6 +50,7 @@ static int gdbstub_port;
 static envlist_t *envlist;
 static const char *cpu_model;
 static const char *cpu_type;
+static const char *seed_optarg;
 unsigned long mmap_min_addr;
 unsigned long guest_base;
 int have_guest_base;
@@ -290,15 +293,9 @@ static void handle_arg_pagesize(const char *arg)
     }
 }
 
-static void handle_arg_randseed(const char *arg)
+static void handle_arg_seed(const char *arg)
 {
-    unsigned long long seed;
-
-    if (parse_uint_full(arg, &seed, 0) != 0 || seed > UINT_MAX) {
-        fprintf(stderr, "Invalid seed number: %s\n", arg);
-        exit(EXIT_FAILURE);
-    }
-    srand(seed);
+    seed_optarg = arg;
 }
 
 static void handle_arg_gdb(const char *arg)
@@ -433,7 +430,7 @@ static const struct qemu_argument arg_table[] = {
      "",           "run in singlestep mode"},
     {"strace",     "QEMU_STRACE",      false, handle_arg_strace,
      "",           "log system calls"},
-    {"seed",       "QEMU_RAND_SEED",   true,  handle_arg_randseed,
+    {"seed",       "QEMU_RAND_SEED",   true,  handle_arg_seed,
      "",           "Seed for pseudo-random number generator"},
     {"trace",      "QEMU_TRACE",       true,  handle_arg_trace,
      "",           "[[enable=]<pattern>][,events=<file>][,file=<file>]"},
@@ -626,8 +623,6 @@ int main(int argc, char **argv, char **envp)
 
     cpu_model = NULL;
 
-    srand(time(NULL));
-
     qemu_add_opts(&qemu_trace_opts);
 
     optind = parse_args(argc, argv);
@@ -689,8 +684,20 @@ int main(int argc, char **argv, char **envp)
         do_strace = 1;
     }
 
-    if (getenv("QEMU_RAND_SEED")) {
-        handle_arg_randseed(getenv("QEMU_RAND_SEED"));
+    if (seed_optarg == NULL) {
+        seed_optarg = getenv("QEMU_RAND_SEED");
+    }
+    {
+        Error *err = NULL;
+        if (seed_optarg != NULL) {
+            qemu_guest_random_seed_main(seed_optarg, &err);
+        } else {
+            qcrypto_init(&err);
+        }
+        if (err) {
+            error_reportf_err(err, "cannot initialize crypto: ");
+            exit(1);
+        }
     }
 
     target_environ = envlist_to_environ(envlist, NULL);