Kernel: Disable big process lock for sys$uname()

Author: https://github.com/bgianfo
Commit: bfd4635274
Pull-request: https://github.com/SerenityOS/serenity/pull/8864
Reviewed-by: https://github.com/IdanHo
Reviewed-by: https://github.com/gunnarbeutner ✅
Reviewed-by: https://github.com/tomuta ✅

Kernel/API/Syscall.h

@@ -67,7 +67,7 @@ enum class NeedsBigProcessLock {
     S(gethostname, NeedsBigProcessLock::No)                 \
     S(sethostname, NeedsBigProcessLock::No)                 \
     S(chdir, NeedsBigProcessLock::Yes)                      \
-    S(uname, NeedsBigProcessLock::Yes)                      \
+    S(uname, NeedsBigProcessLock::No)                       \
     S(set_mmap_name, NeedsBigProcessLock::Yes)              \
     S(readlink, NeedsBigProcessLock::Yes)                   \
     S(write, NeedsBigProcessLock::Yes)                      \

Kernel/Syscalls/uname.cpp

@@ -10,7 +10,7 @@ namespace Kernel {
 
 KResultOr<FlatPtr> Process::sys$uname(Userspace<utsname*> user_buf)
 {
-    VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this)
+    VERIFY_NO_PROCESS_BIG_LOCK(this)
     extern String* g_hostname;
     extern Mutex* g_hostname_lock;