riscv: Constify sys_call_table

Constify the sys_call_table so that it will be placed in the .rodata
section. This will cause attempts to modify the table to fail when
strict page permissions are in place.

Signed-off-by: Jisheng Zhang <jszhang@kernel.org>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>

diff --git a/arch/riscv/include/asm/syscall.h b/arch/riscv/include/asm/syscall.h
index 49350c8..b933b15 100644 (file)
--- a/arch/riscv/include/asm/syscall.h
+++ b/arch/riscv/include/asm/syscall.h
@@ -15,7 +15,7 @@
 #include <linux/err.h>
 
 /* The array of function pointers for syscalls. */
-extern void *sys_call_table[];
+extern void * const sys_call_table[];
 
 /*
  * Only the low 32 bits of orig_r0 are meaningful, so we return int.

diff --git a/arch/riscv/kernel/syscall_table.c b/arch/riscv/kernel/syscall_table.c
index f1ead9d..a63c667 100644 (file)
--- a/arch/riscv/kernel/syscall_table.c
+++ b/arch/riscv/kernel/syscall_table.c
@@ -13,7 +13,7 @@
 #undef __SYSCALL
 #define __SYSCALL(nr, call)    [nr] = (call),
 
-void *sys_call_table[__NR_syscalls] = {
+void * const sys_call_table[__NR_syscalls] = {
        [0 ... __NR_syscalls - 1] = sys_ni_syscall,
 #include <asm/unistd.h>
 };