voron

commit 7dbbbfdd051d82b8eeba896d7e42af5007a7d0d4
parent 6e4eddb298de842f598521c075df71f363aaff7f
Author: oblique <psyberbits@gmail.com>
Date:   Fri, 26 Apr 2013 17:25:29 +0300

mmu.c,kmmap: check if the virtual address is PAGE_SIZE aligned.

Diffstat:
M
kernel/mmu.c
 | 
6
+++---

1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/kernel/mmu.c b/kernel/mmu.c
@@ -203,11 +203,11 @@ kmmap(void *virt, uint_t npages, mmu_ap_t perms)
 	uintptr_t virt_a;
 	void *pa;
 
-	if (npages == 0)
-		return -EINVAL;
-
 	virt_a = (uintptr_t)virt;
 
+	if (npages == 0 ||  virt_a & (PAGE_SIZE - 1))
+		return -EINVAL;
+
 	/* overflow */
 	if (virt_a + npages * PAGE_SIZE < virt_a)
 		return -EFAULT;