[PULL,v3,05/16] linux-user: Flush out implementation of gettimeofday

Commit Message

Laurent Vivier March 19, 2020, 9:26 a.m. UTC

From: Richard Henderson <[e-mail]>

The first argument, timeval, is allowed to be NULL.

The second argument, timezone, was missing.  While its use is
deprecated, it is still present in the syscall.

Reviewed-by: Alex Bennée <[e-mail]>
Reviewed-by: Philippe Mathieu-Daudé <[e-mail]>
Signed-off-by: Richard Henderson <[e-mail]>
Message-Id: <[e-mail]>
Signed-off-by: Laurent Vivier <[e-mail]>
---
 linux-user/syscall.c | 27 +++++++++++++++++++++++++--
 1 file changed, 25 insertions(+), 2 deletions(-)

Patch

diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index 5479d67a10be..811495c3a0bc 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -1228,6 +1228,23 @@  static inline abi_long host_to_target_timespec64(abi_ulong target_addr,
     return 0;
 }
 
+static inline abi_long copy_to_user_timezone(abi_ulong target_tz_addr,
+                                             struct timezone *tz)
+{
+    struct target_timezone *target_tz;
+
+    if (!lock_user_struct(VERIFY_WRITE, target_tz, target_tz_addr, 1)) {
+        return -TARGET_EFAULT;
+    }
+
+    __put_user(tz->tz_minuteswest, &target_tz->tz_minuteswest);
+    __put_user(tz->tz_dsttime, &target_tz->tz_dsttime);
+
+    unlock_user_struct(target_tz, target_tz_addr, 1);
+
+    return 0;
+}
+
 static inline abi_long copy_from_user_timezone(struct timezone *tz,
                                                abi_ulong target_tz_addr)
 {
@@ -8642,10 +8659,16 @@  static abi_long do_syscall1(void *cpu_env, int num, abi_long arg1,
     case TARGET_NR_gettimeofday:
         {
             struct timeval tv;
-            ret = get_errno(gettimeofday(&tv, NULL));
+            struct timezone tz;
+
+            ret = get_errno(gettimeofday(&tv, &tz));
             if (!is_error(ret)) {
-                if (copy_to_user_timeval(arg1, &tv))
+                if (arg1 && copy_to_user_timeval(arg1, &tv)) {
                     return -TARGET_EFAULT;
+                }
+                if (arg2 && copy_to_user_timezone(arg2, &tz)) {
+                    return -TARGET_EFAULT;
+                }
             }
         }
         return ret;