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[PULL,v2,8/8] linux-user: add getrandom() syscall

Message ID f894efd19917321844b31e5dd7a061fdc6fb322d.1456397907.git.riku.voipio@linaro.org (mailing list archive)
State New, archived
Headers show

Commit Message

Riku Voipio Feb. 25, 2016, 11:01 a.m. UTC 
From: Laurent Vivier <laurent@vivier.eu>

getrandom() has been introduced in kernel 3.17 and is now used during
the boot sequence of Debian unstable (stretch/sid).

Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
---
 linux-user/syscall.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)
diff mbox

Patch

diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index 539183a..9517531 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -249,6 +249,9 @@  _syscall2(int, ioprio_get, int, which, int, who)
 #if defined(TARGET_NR_ioprio_set) && defined(__NR_ioprio_set)
 _syscall3(int, ioprio_set, int, which, int, who, int, ioprio)
 #endif
+#if defined(TARGET_NR_getrandom) && defined(__NR_getrandom)
+_syscall3(int, getrandom, void *, buf, size_t, buflen, unsigned int, flags)
+#endif
 
 static bitmask_transtbl fcntl_flags_tbl[] = {
   { TARGET_O_ACCMODE,   TARGET_O_WRONLY,    O_ACCMODE,   O_WRONLY,    },
@@ -7541,6 +7544,16 @@  abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
         ret = get_errno(shutdown(arg1, arg2));
         break;
 #endif
+#if defined(TARGET_NR_getrandom) && defined(__NR_getrandom)
+    case TARGET_NR_getrandom:
+        p = lock_user(VERIFY_WRITE, arg1, arg2, 0);
+        if (!p) {
+            goto efault;
+        }
+        ret = get_errno(getrandom(p, arg2, arg3));
+        unlock_user(p, arg1, ret);
+        break;
+#endif
 #ifdef TARGET_NR_socket
     case TARGET_NR_socket:
         ret = do_socket(arg1, arg2, arg3);