Commit 67df197b authored by Arjan van de Ven's avatar Arjan van de Ven Committed by Linus Torvalds

[PATCH] x86/x86_64: mark rodata section read-only: x86-64 support

x86-64 specific parts to make the .rodata section read only
Signed-off-by: default avatarArjan van de Ven <arjan@infradead.org>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
Cc: Andi Kleen <ak@muc.de>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent c728252c
......@@ -9,6 +9,16 @@ config INIT_DEBUG
Fill __init and __initdata at the end of boot. This helps debugging
illegal uses of __init and __initdata after initialization.
config DEBUG_RODATA
bool "Write protect kernel read-only data structures"
depends on DEBUG_KERNEL
help
Mark the kernel read-only data as write-protected in the pagetables,
in order to catch accidental (and incorrect) writes to such const data.
This option may have a slight performance impact because a portion
of the kernel code won't be covered by a 2MB TLB anymore.
If in doubt, say "N".
config IOMMU_DEBUG
depends on GART_IOMMU && DEBUG_KERNEL
bool "Enable IOMMU debugging"
......
......@@ -498,6 +498,29 @@ void free_initmem(void)
printk ("Freeing unused kernel memory: %luk freed\n", (__init_end - __init_begin) >> 10);
}
#ifdef CONFIG_DEBUG_RODATA
extern char __start_rodata, __end_rodata;
void mark_rodata_ro(void)
{
unsigned long addr = (unsigned long)&__start_rodata;
for (; addr < (unsigned long)&__end_rodata; addr += PAGE_SIZE)
change_page_attr_addr(addr, 1, PAGE_KERNEL_RO);
printk ("Write protecting the kernel read-only data: %luk\n",
(&__end_rodata - &__start_rodata) >> 10);
/*
* change_page_attr_addr() requires a global_flush_tlb() call after it.
* We do this after the printk so that if something went wrong in the
* change, the printk gets out at least to give a better debug hint
* of who is the culprit.
*/
global_flush_tlb();
}
#endif
#ifdef CONFIG_BLK_DEV_INITRD
void free_initrd_mem(unsigned long start, unsigned long end)
{
......
......@@ -27,4 +27,8 @@ void global_flush_tlb(void);
int change_page_attr(struct page *page, int numpages, pgprot_t prot);
int change_page_attr_addr(unsigned long addr, int numpages, pgprot_t prot);
#ifdef CONFIG_DEBUG_RODATA
void mark_rodata_ro(void);
#endif
#endif /* _X8664_CACHEFLUSH_H */
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