Re: [PATCH v2 3/9] riscv: Constify sys_call_table

[Anup Patel]

On Wed, Mar 31, 2021 at 10:01 PM Jisheng Zhang
 wrote:
>
> From: Jisheng Zhang 
>
> 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 

Looks good to me.

Reviewed-by: Anup Patel 

Regards,
Anup

> ---
>  arch/riscv/include/asm/syscall.h  | 2 +-
>  arch/riscv/kernel/syscall_table.c | 2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/arch/riscv/include/asm/syscall.h 
> b/arch/riscv/include/asm/syscall.h
> index 49350c8bd7b0..b933b1583c9f 100644
> --- a/arch/riscv/include/asm/syscall.h
> +++ b/arch/riscv/include/asm/syscall.h
> @@ -15,7 +15,7 @@
>  #include 
>
>  /* 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 f1ead9df96ca..a63c667c27b3 100644
> --- 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 
>  };
> --
> 2.31.0
>
>
>
> ___
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> linux-ri...@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-riscv

[PATCH v2 3/9] riscv: Constify sys_call_table

[Jisheng Zhang]

From: Jisheng Zhang 

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 
---
 arch/riscv/include/asm/syscall.h  | 2 +-
 arch/riscv/kernel/syscall_table.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/riscv/include/asm/syscall.h b/arch/riscv/include/asm/syscall.h
index 49350c8bd7b0..b933b1583c9f 100644
--- a/arch/riscv/include/asm/syscall.h
+++ b/arch/riscv/include/asm/syscall.h
@@ -15,7 +15,7 @@
 #include 
 
 /* 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 f1ead9df96ca..a63c667c27b3 100644
--- 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 
 };
-- 
2.31.0