lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

[PARISC] Add CONFIG_DEBUG_RODATA to protect read-only data

Browse Source 
Add the parisc version of the "mark rodata section read only" patches.
Based on code from and Signed-off-by Arjan van de Ven
<arjan@infradead.org>, Ingo Molnar <mingo@elte.hu>, Andi Kleen <ak@muc.de>,
Andrew Morton <akpm@osdl.org>, Linus Torvalds <torvalds@osdl.org>.

Signed-off-by: Helge Deller <deller@parisc-linux.org>
Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>
This commit is contained in:
Helge Deller
2006-01-13 13:21:06 -07:00
committed by Kyle McMartin
parent a2bb214dcd
commit 1bcdd85482
6 changed files with 34 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

15
arch/parisc/mm/init.c
View File

@@ -417,6 +417,19 @@ void free_initmem(void)
#endif
}
#ifdef CONFIG_DEBUG_RODATA
void mark_rodata_ro(void)
{
extern char __start_rodata, __end_rodata;
/* rodata memory was already mapped with KERNEL_RO access rights by
pagetable_init() and map_pages(). No need to do additional stuff here */
printk (KERN_INFO "Write protecting the kernel read-only data: %luk\n",
(unsigned long)(&__end_rodata - &__start_rodata) >> 10);
}
#endif
/*
* Just an arbitrary offset to serve as a "hole" between mapping areas
* (between top of physical memory and a potential pcxl dma mapping
@@ -685,7 +698,7 @@ static void __init pagetable_init(void)
#ifdef CONFIG_BLK_DEV_INITRD
if (initrd_end && initrd_end > mem_limit) {
printk("initrd: mapping %08lx-%08lx\n", initrd_start, initrd_end);
printk(KERN_INFO "initrd: mapping %08lx-%08lx\n", initrd_start, initrd_end);
map_pages(initrd_start, __pa(initrd_start),
initrd_end - initrd_start, PAGE_KERNEL);
}