Commit ed1dc778 authored by Matias Zabaljauregui's avatar Matias Zabaljauregui Committed by Rusty Russell
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lguest: map switcher with executable page table entries 



Map switcher with executable page table entries.
(This bug didn't matter before PAE and hence NX support -- RR)

Signed-off-by: default avatarMatias Zabaljauregui <zabaljauregui@gmail.com>
Signed-off-by: default avatarRusty Russell <rusty@rustcorp.com.au>
parent 7b5c806c

drivers/lguest/core.c

+1 −1
Original line number Diff line number Diff line
@@ -95,7 +95,7 @@ static __init int map_switcher(void) 
	 * array of struct pages.  It increments that pointer, but we don't

	 * care. */

	pagep = switcher_page;

	err = map_vm_area(switcher_vma, PAGE_KERNEL, &pagep);

	err = map_vm_area(switcher_vma, PAGE_KERNEL_EXEC, &pagep);

	if (err) {

		printk("lguest: map_vm_area failed: %i\n", err);

		goto free_vma;

drivers/lguest/page_tables.c

+1 −1
Original line number Diff line number Diff line
@@ -714,7 +714,7 @@ void map_switcher_in_guest(struct lg_cpu *cpu, struct lguest_pages *pages) 


	/* Make the last PGD entry for this Guest point to the Switcher's PTE

	 * page for this CPU (with appropriate flags). */

	switcher_pgd = __pgd(__pa(switcher_pte_page) | __PAGE_KERNEL);

	switcher_pgd = __pgd(__pa(switcher_pte_page) | __PAGE_KERNEL_EXEC);



	cpu->lg->pgdirs[cpu->cpu_pgd].pgdir[SWITCHER_PGD_INDEX] = switcher_pgd;