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User pointer validity checks.

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Added routines that check whether a user pointer is accessible by the kernel,
and if not ask the pager to map-in those pages. I haven't implemented yet the
bit that asks the pager for paging-in.
This commit is contained in:
Bahadir Balban
2008-02-05 15:41:14 +00:00
parent 3a07ae70fd
commit a82cdd3456
8 changed files with 155 additions and 72 deletions
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31
src/api/kip.c
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@@ -1,12 +1,12 @@
/*
* Kernel Interface Page and sys_kdata_read()
*
* Copyright (C) 2007 Bahadir Balban
*
* Copyright (C) 2007, 2008 Bahadir Balban
*/
#include <l4/generic/tcb.h>
#include <l4/generic/physmem.h>
#include <l4/generic/space.h>
#include <l4/api/errno.h>
#include INC_API(kip.h)
#include INC_API(syscall.h)
#include INC_GLUE(memlayout.h)
@@ -19,30 +19,25 @@ UNIT("kip") struct kip kip;
int __sys_kread(int rd, void *dest)
{
int err = 0;
unsigned long vaddr = (unsigned long)dest;
switch(rd) {
case KDATA_PAGE_MAP:
/*
* FIXME:FIXME: Check if address is mapped here first!!!
* Also check if process has enough buffer for physmem to fit!!!
*/
printk("Handling KDATA_PAGE_MAP request.\n");
if (check_access(vaddr, sizeof(page_map), MAP_USR_RW_FLAGS) < 0)
return -EINVAL;
memcpy(dest, &page_map, sizeof(page_map));
break;
case KDATA_BOOTDESC:
printk("Handling KDATA_BOOTDESC request.\n");
/*
* FIXME:FIXME: Check if address is mapped here first!!!
* Also check if process has enough buffer for physmem to fit!!!
*/
if (check_access(vaddr, bootdesc->desc_size, MAP_USR_RW_FLAGS) < 0)
return -EINVAL;
memcpy(dest, bootdesc, bootdesc->desc_size);
break;
case KDATA_BOOTDESC_SIZE:
printk("Handling KDATA_BOOTDESC_SIZE request.\n");
/*
* FIXME:FIXME: Check if address is mapped here first!!!
* Also check if process has enough buffer for physmem to fit!!!
*/
if (check_access(vaddr, sizeof(unsigned int), MAP_USR_RW_FLAGS) < 0)
return -EINVAL;
*(unsigned int *)dest = bootdesc->desc_size;
break;
@@ -69,10 +64,8 @@ int sys_kread(struct syscall_args *a)
int rd = (int)arg[0]; /* Request descriptor */
/* Error checking */
if ((rd < 0) || (addr <= 0)) {
printk("%s: Invalid arguments.\n", __FUNCTION__);
return -1;
}
if (rd < 0)
return -EINVAL;
return __sys_kread(rd, addr);
}