diff options
Diffstat (limited to 'arch/x86/boot/compressed/kaslr.c')
| -rw-r--r-- | arch/x86/boot/compressed/kaslr.c | 29 |
1 files changed, 20 insertions, 9 deletions
diff --git a/arch/x86/boot/compressed/kaslr.c b/arch/x86/boot/compressed/kaslr.c index 81edf992277a..e55ebcbfa290 100644 --- a/arch/x86/boot/compressed/kaslr.c +++ b/arch/x86/boot/compressed/kaslr.c @@ -279,15 +279,24 @@ static void mem_avoid_init(unsigned long input, unsigned long input_size, #endif } -/* Does this memory vector overlap a known avoided area? */ -static bool mem_avoid_overlap(struct mem_vector *img) +/* + * Does this memory vector overlap a known avoided area? If so, record the + * overlap region with the lowest address. + */ +static bool mem_avoid_overlap(struct mem_vector *img, + struct mem_vector *overlap) { int i; struct setup_data *ptr; + unsigned long earliest = img->start + img->size; + bool is_overlapping = false; for (i = 0; i < MEM_AVOID_MAX; i++) { - if (mem_overlaps(img, &mem_avoid[i])) - return true; + if (mem_overlaps(img, &mem_avoid[i]) && + mem_avoid[i].start < earliest) { + *overlap = mem_avoid[i]; + is_overlapping = true; + } } /* Avoid all entries in the setup_data linked list. */ @@ -298,13 +307,15 @@ static bool mem_avoid_overlap(struct mem_vector *img) avoid.start = (unsigned long)ptr; avoid.size = sizeof(*ptr) + ptr->len; - if (mem_overlaps(img, &avoid)) - return true; + if (mem_overlaps(img, &avoid) && (avoid.start < earliest)) { + *overlap = avoid; + is_overlapping = true; + } ptr = (struct setup_data *)(unsigned long)ptr->next; } - return false; + return is_overlapping; } static unsigned long slots[KERNEL_IMAGE_SIZE / CONFIG_PHYSICAL_ALIGN]; @@ -361,7 +372,7 @@ static void process_e820_entry(struct e820entry *entry, unsigned long minimum, unsigned long image_size) { - struct mem_vector region, img; + struct mem_vector region, img, overlap; /* Skip non-RAM entries. */ if (entry->type != E820_RAM) @@ -400,7 +411,7 @@ static void process_e820_entry(struct e820entry *entry, for (img.start = region.start, img.size = image_size ; mem_contains(®ion, &img) ; img.start += CONFIG_PHYSICAL_ALIGN) { - if (mem_avoid_overlap(&img)) + if (mem_avoid_overlap(&img, &overlap)) continue; slots_append(img.start); } |