Messages in this thread | | | Date | Wed, 8 Mar 2000 16:46:17 -0500 | From | Joel Hollingsworth <> | Subject | write protect kernel page problem |
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Hi,
I'm using the following code in an attempt to write protect a kernel page dependent on a particular address:
char *ptr; unsigned long addr; pgd_t *kpgd; pmd_t *kpmd; pte_t *kpte; pte_t pte;
ptr = kmalloc(sizeof(int),GFP_ATOMIC); addr = (unsigned long)ptr; kpgd = pgd_offset_k(addr); kpmd = pmd_offset(kpgd,addr); kpte = pte_offset(kpmd,addr); pte = *kpte; pte = pte_wrprotect(pte); set_pte(kpte,pte); flush_tlb_all();
Using 2.2.14 and have edited linux/arch/i386/mm/init.c to remove the use of the 4MB kernel page tables. Everything seems to work until the set_pte(kpte,pte) call. I crash the kernel at that point.
I followed a similar thread on this list concerning a 2.3.x kernel, but am still a bit confused as to the problem I'm creating here. Any thoughts or suggestions would be most appreciated.
Please cc to me, as I am not currently on the list.
thanks.
-joel jkholl@cs.wm.edu
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