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Added proper checking of capability overlap for memcap_unmap

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This commit is contained in:
Bahadir Balban
2009-11-21 12:01:41 +02:00
parent bf8d95985f
commit a13120c073
1 changed files with 44 additions and 16 deletions
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60
src/generic/resource.c
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@@ -12,6 +12,7 @@
#include <l4/lib/memcache.h>
#include INC_GLUE(memory.h)
#include INC_ARCH(linker.h)
#include <l4/api/errno.h>
struct kernel_resources kernel_resources;
@@ -260,13 +261,24 @@ int memcap_unmap_range(struct capability *cap,
* by either shrinking, splitting or destroying the
* intersecting capability. Similar to do_munmap()
*/
int memcap_unmap(struct cap_list *cap_list,
int memcap_unmap(struct cap_list *used_list, struct cap_list *cap_list,
const unsigned long unmap_start,
const unsigned long unmap_end)
{
struct capability *cap, *n;
int err;
/*
* If a used list was supplied, check that the
* range does not intersect with the used list.
* This is an optional sanity check.
*/
if (used_list)
list_foreach_removable_struct(cap, n, &used_list->caps, list)
if (set_intersection(unmap_start, unmap_end,
cap->start, cap->end))
return -EPERM;
list_foreach_removable_struct(cap, n, &cap_list->caps, list) {
/* Check for intersection */
if (set_intersection(unmap_start, unmap_end,
@@ -279,8 +291,7 @@ int memcap_unmap(struct cap_list *cap_list,
return 0;
}
}
/* Return 1 to indicate unmap didn't occur */
return 1;
return -EEXIST;
}
/*
@@ -326,7 +337,7 @@ int free_boot_memory(struct kernel_resources *kres)
__pfn(page_align_up(virt_to_phys(_end_init)));
/* Trim kernel used memory cap */
memcap_unmap(&kres->physmem_used, pfn_start, pfn_end);
memcap_unmap(0, &kres->physmem_used, pfn_start, pfn_end);
/* Add it to unused physical memory */
memcap_map(&kres->physmem_free, pfn_start, pfn_end);
@@ -399,7 +410,7 @@ void init_kernel_resources(struct kernel_resources *kres)
cap_list_insert(kernel_area, &kres->physmem_used);
/* Unmap kernel used area from free physical memory capabilities */
memcap_unmap(&kres->physmem_free, kernel_area->start,
memcap_unmap(0, &kres->physmem_free, kernel_area->start,
kernel_area->end);
@@ -772,39 +783,56 @@ int process_cap_info(struct cap_info *cap,
switch (cap_type(cap)) {
case CAP_TYPE_MAP_VIRTMEM:
if ((ret = memcap_unmap(&kres->virtmem_free,
if ((ret = memcap_unmap(&kres->virtmem_used, &kres->virtmem_free,
cap->start, cap->end))) {
if (ret < 0)
if (ret == -ENOMEM)
printk("%s: FATAL: Insufficient boot memory "
"to split capability\n",
__KERNELNAME__);
if (ret > 0)
printk("%s: FATAL: Memory capability range "
"overlaps with another one. "
if (ret == -EPERM)
printk("%s: FATAL: Virtual memory capability range "
"overlaps with an already used range. "
"start=0x%lx, end=0x%lx\n",
__KERNELNAME__,
__pfn_to_addr(cap->start),
__pfn_to_addr(cap->end));
if (ret == -EEXIST)
printk("%s: FATAL: Virtual memory capability range "
"does not match with any available free range. "
"start=0x%lx, end=0x%lx\n",
__KERNELNAME__,
__pfn_to_addr(cap->start),
__pfn_to_addr(cap->end));
BUG();
}
break;
case CAP_TYPE_MAP_PHYSMEM:
if ((ret = memcap_unmap(&kres->physmem_free,
cap->start, cap->end))) {
if (ret < 0)
if ((ret = memcap_unmap(&kres->physmem_used, &kres->physmem_free,
cap->start, cap->end))) {
if (ret == -ENOMEM)
printk("%s: FATAL: Insufficient boot memory "
"to split capability\n",
__KERNELNAME__);
if (ret > 0)
printk("%s: FATAL: Memory capability range "
"overlaps with another one. "
if (ret == -EPERM)
printk("%s: FATAL: Physical memory capability range "
"overlaps with an already used range. "
"start=0x%lx, end=0x%lx\n",
__KERNELNAME__,
__pfn_to_addr(cap->start),
__pfn_to_addr(cap->end));
if (ret == -EEXIST)
printk("%s: FATAL: Physical memory capability range "
"does not match with any available free range. "
"start=0x%lx, end=0x%lx\n",
__KERNELNAME__,
__pfn_to_addr(cap->start),
__pfn_to_addr(cap->end));
BUG();
}
break;
}