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riscv: Constify sys_call_table

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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>
This commit is contained in:
Jisheng Zhang 2021-03-30 02:23:24 +08:00 committed by Palmer Dabbelt
parent de31ea4a11
commit e6a302248c
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2 changed files with 2 additions and 2 deletions
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2
arch/riscv/include/asm/syscall.h
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@ -15,7 +15,7 @@
#include <linux/err.h> #include <linux/err.h>
/* The array of function pointers for syscalls. */ /* 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. * Only the low 32 bits of orig_r0 are meaningful, so we return int.

2
arch/riscv/kernel/syscall_table.c
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@ -13,7 +13,7 @@
#undef __SYSCALL #undef __SYSCALL
#define __SYSCALL(nr, call) [nr] = (call), #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, [0 ... __NR_syscalls - 1] = sys_ni_syscall,
#include <asm/unistd.h> #include <asm/unistd.h>
}; };