From 4484513b45c718807ef681a3ce6ce9daf57a64ca Mon Sep 17 00:00:00 2001
From: Liav A <liavalb@gmail.com>
Date: Fri, 13 Mar 2020 01:17:14 +0200
Subject: [PATCH] Kernel: Add new syscall to allow changing the system date

---
 Kernel/Process.cpp | 17 +++++++++++++++++
 Kernel/Process.h   |  1 +
 Kernel/Syscall.h   |  1 +
 3 files changed, 19 insertions(+)

diff --git a/Kernel/Process.cpp b/Kernel/Process.cpp
index 27df56452e6..9c45739ba6a 100644
--- a/Kernel/Process.cpp
+++ b/Kernel/Process.cpp
@@ -4283,6 +4283,23 @@ int Process::sys$clock_gettime(clockid_t clock_id, timespec* user_ts)
     return 0;
 }
 
+int Process::sys$clock_settime(clockid_t clock_id, timespec* user_ts)
+{
+    SmapDisabler disabler;
+    REQUIRE_PROMISE(stdio);
+    if (!validate_write_typed(user_ts))
+        return -EFAULT;
+
+    switch (clock_id) {
+    case CLOCK_REALTIME:
+        TimeManagement::the().set_epoch_time(user_ts->tv_sec);
+        break;
+    default:
+        return -EINVAL;
+    }
+    return 0;
+}
+
 int Process::sys$clock_nanosleep(const Syscall::SC_clock_nanosleep_params* user_params)
 {
     REQUIRE_PROMISE(stdio);
diff --git a/Kernel/Process.h b/Kernel/Process.h
index 47ba58315ce..2fefa8aec43 100644
--- a/Kernel/Process.h
+++ b/Kernel/Process.h
@@ -213,6 +213,7 @@ public:
     int sys$usleep(useconds_t usec);
     int sys$gettimeofday(timeval*);
     int sys$clock_gettime(clockid_t, timespec*);
+    int sys$clock_settime(clockid_t, timespec*);
     int sys$clock_nanosleep(const Syscall::SC_clock_nanosleep_params*);
     int sys$gethostname(char*, ssize_t);
     int sys$uname(utsname*);
diff --git a/Kernel/Syscall.h b/Kernel/Syscall.h
index 5cef651458e..9e7dcd7b164 100644
--- a/Kernel/Syscall.h
+++ b/Kernel/Syscall.h
@@ -158,6 +158,7 @@ namespace Kernel {
     __ENUMERATE_SYSCALL(getrandom)            \
     __ENUMERATE_SYSCALL(setkeymap)            \
     __ENUMERATE_SYSCALL(clock_gettime)        \
+    __ENUMERATE_SYSCALL(clock_settime)        \
     __ENUMERATE_SYSCALL(clock_nanosleep)      \
     __ENUMERATE_SYSCALL(join_thread)          \
     __ENUMERATE_SYSCALL(module_load)          \