syscall: rename module name to syscall_steal

In Debian, the name syscall conflicts with this patch:
in debian kernel source tree:
debian/patches/features/x86/x86-make-x32-syscall-support-conditional.patch
mailing list url:
https://lore.kernel.org/lkml/1415245982.3398.53.camel@decadent.org.uk/T/#u
which introduces a parameter named syscall.x32. So change our name.

examples/Makefile

@@ -16,7 +16,7 @@ obj-m += print_string.o
 obj-m += kbleds.o
 obj-m += sched.o
 obj-m += chardev2.o
-obj-m += syscall.o
+obj-m += syscall_steal.o
 obj-m += intrpt.o
 obj-m += cryptosha256.o
 obj-m += cryptosk.o

examples/syscall.c → examples/syscall_steal.c

@@ -1,5 +1,5 @@
 /*
- * syscall.c
+ * syscall_steal.c
  *
  * System call "stealing" sample.
  *
@@ -206,7 +206,7 @@ static void disable_write_protection(void)
     __write_cr0(cr0);
 }
 
-static int __init syscall_start(void)
+static int __init syscall_steal_start(void)
 {
     if (!(sys_call_table = acquire_sys_call_table()))
         return -1;
@@ -226,7 +226,7 @@ static int __init syscall_start(void)
     return 0;
 }
 
-static void __exit syscall_end(void)
+static void __exit syscall_steal_end(void)
 {
     if (!sys_call_table)
         return;
@@ -246,7 +246,7 @@ static void __exit syscall_end(void)
     msleep(2000);
 }
 
-module_init(syscall_start);
-module_exit(syscall_end);
+module_init(syscall_steal_start);
+module_exit(syscall_steal_end);
 
 MODULE_LICENSE("GPL");

lkmpg.tex

@@ -1491,7 +1491,7 @@ $ sudo grep sys_call_table /proc/kallsyms
 ffffffff82000280 R x32_sys_call_table
 ffffffff820013a0 R sys_call_table
 ffffffff820023e0 R ia32_sys_call_table
-$ sudo insmod syscall.ko sym=0xffffffff820013a0
+$ sudo insmod syscall_steal.ko sym=0xffffffff820013a0
 \end{verbatim}
 
 Using the address from \verb|/boot/System.map|, be careful about \verb|KASLR| (Kernel Address Space Layout Randomization).