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x86/kaslr: Make local variables 64-bit

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Change the type of local variables/fields that store mem_vector
addresses to u64 to make it less likely that 32-bit overflow will cause
issues on 32-bit.

Signed-off-by: Arvind Sankar <nivedita@alum.mit.edu>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20200728225722.67457-21-nivedita@alum.mit.edu
This commit is contained in:
Arvind Sankar 2020-07-28 18:57:21 -04:00 committed by Ingo Molnar
parent 3a066990a3
commit 0eb1a8af01
1 changed files with 7 additions and 6 deletions
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13
arch/x86/boot/compressed/kaslr.c
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@ -461,7 +461,7 @@ static bool mem_avoid_overlap(struct mem_vector *img,
{ {
int i; int i;
struct setup_data *ptr; struct setup_data *ptr;
unsigned long earliest = img->start + img->size; u64 earliest = img->start + img->size;
bool is_overlapping = false; bool is_overlapping = false;
for (i = 0; i < MEM_AVOID_MAX; i++) { for (i = 0; i < MEM_AVOID_MAX; i++) {
@ -506,7 +506,7 @@ static bool mem_avoid_overlap(struct mem_vector *img,
} }
struct slot_area { struct slot_area {
unsigned long addr; u64 addr;
unsigned long num; unsigned long num;
}; };
@ -537,7 +537,8 @@ static void store_slot_info(struct mem_vector *region, unsigned long image_size)
static void static void
process_gb_huge_pages(struct mem_vector *region, unsigned long image_size) process_gb_huge_pages(struct mem_vector *region, unsigned long image_size)
{ {
unsigned long pud_start, pud_end, gb_huge_pages; u64 pud_start, pud_end;
unsigned long gb_huge_pages;
struct mem_vector tmp; struct mem_vector tmp;
if (!IS_ENABLED(CONFIG_X86_64) || !max_gb_huge_pages) { if (!IS_ENABLED(CONFIG_X86_64) || !max_gb_huge_pages) {
@ -579,7 +580,7 @@ process_gb_huge_pages(struct mem_vector *region, unsigned long image_size)
} }
} }
static unsigned long slots_fetch_random(void) static u64 slots_fetch_random(void)
{ {
unsigned long slot; unsigned long slot;
unsigned int i; unsigned int i;
@ -595,7 +596,7 @@ static unsigned long slots_fetch_random(void)
slot -= slot_areas[i].num; slot -= slot_areas[i].num;
continue; continue;
} }
return slot_areas[i].addr + slot * CONFIG_PHYSICAL_ALIGN; return slot_areas[i].addr + ((u64)slot * CONFIG_PHYSICAL_ALIGN);
} }
if (i == slot_area_index) if (i == slot_area_index)
@ -608,7 +609,7 @@ static void __process_mem_region(struct mem_vector *entry,
unsigned long image_size) unsigned long image_size)
{ {
struct mem_vector region, overlap; struct mem_vector region, overlap;
unsigned long region_end; u64 region_end;
/* Enforce minimum and memory limit. */ /* Enforce minimum and memory limit. */
region.start = max_t(u64, entry->start, minimum); region.start = max_t(u64, entry->start, minimum);