sbrk: A negative sbrk is permissible, in fact /bin/sh uses it

diff --git a/Kernel/syscall_proc.c b/Kernel/syscall_proc.c
index 402e7d8..220dbbc 100644 (file)
--- a/Kernel/syscall_proc.c
+++ b/Kernel/syscall_proc.c
@@ -245,8 +245,6 @@ arg_t _sbrk(void)
        uaddr_t oldbrk;
 
        udata.u_argn += (oldbrk = udata.u_break);
-       if ((unsigned) udata.u_argn < oldbrk)
-               return (-1);
        if (_brk())             /* brk (udata.u_argn) */
                return (-1);