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[PATCH] x86/x86_64: mark rodata section read-only: make some datastructures const 

Mark some key kernel datastructures readonly.  This patch was previously
posted on Jun 28th but was back then not merged because nothing was enforcing
rodata anyway..  well that changed now :)

Patch by Christoph Lameter <christoph@lameter.com> and Dave Jones
<davej@redhat.com>

Signed-off-by: Arjan van de Ven <arjan@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Cc: Andi Kleen <ak@muc.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
hifive-unleashed-5.1
Arjan van de Ven 2006-01-06 00:12:05 -08:00 committed by Linus Torvalds
parent 67df197b1a
commit bb152f5312
4 changed files with 3 additions and 3 deletions
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1
arch/i386/kernel/entry.S
View File

@ -657,6 +657,7 @@ ENTRY(spurious_interrupt_bug)
pushl $do_spurious_interrupt_bug
jmp error_code
.section .rodata,"a"
#include "syscall_table.S"
syscall_table_size=(.-sys_call_table)

1
arch/i386/kernel/syscall_table.S
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@ -1,4 +1,3 @@
.data
ENTRY(sys_call_table)
.long sys_restart_syscall /* 0 - old "setup()" system call, used for restarting */
.long sys_exit

2
arch/x86_64/ia32/ia32entry.S
View File

@ -341,7 +341,7 @@ ENTRY(ia32_ptregs_common)
jmp ia32_sysret /* misbalances the return cache */
CFI_ENDPROC
.data
.section .rodata,"a"
.align 8
.globl ia32_sys_call_table
ia32_sys_call_table:

2
arch/x86_64/kernel/syscall.c
View File

@ -19,7 +19,7 @@ typedef void (*sys_call_ptr_t)(void);
extern void sys_ni_syscall(void);
sys_call_ptr_t sys_call_table[__NR_syscall_max+1] __cacheline_aligned = {
const sys_call_ptr_t sys_call_table[__NR_syscall_max+1] = {
/* Smells like a like a compiler bug -- it doesn't work when the & below is removed. */
[0 ... __NR_syscall_max] = &sys_ni_syscall,
#include <asm-x86_64/unistd.h>