Commit-ID: 87891b01b54210763117f0a67b022cd94de6cd13
Gitweb: http://git.kernel.org/tip/87891b01b54210763117f0a67b022cd94de6cd13
Author: Baoquan He <bhe@xxxxxxxxxx>
AuthorDate: Sun, 9 Jul 2017 20:37:40 +0800
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Tue, 18 Jul 2017 11:11:11 +0200
x86/boot/KASLR: Switch to pass struct mem_vector to process_e820_entry()
This makes process_e820_entry() be able to process any kind of memory
region.
Signed-off-by: Baoquan He <bhe@xxxxxxxxxx>
Acked-by: Kees Cook <keescook@xxxxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: fanc.fnst@xxxxxxxxxxxxxx
Cc: izumi.taku@xxxxxxxxxxxxxx
Cc: matt@xxxxxxxxxxxxxxxxxxx
Cc: thgarnie@xxxxxxxxxx
Link: http://lkml.kernel.org/r/1499603862-11516-3-git-send-email-bhe@xxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
arch/x86/boot/compressed/kaslr.c | 25 ++++++++++++++-----------
1 file changed, 14 insertions(+), 11 deletions(-)
diff --git a/arch/x86/boot/compressed/kaslr.c b/arch/x86/boot/compressed/kaslr.c
index 1485f48..36ff9f7 100644
--- a/arch/x86/boot/compressed/kaslr.c
+++ b/arch/x86/boot/compressed/kaslr.c
@@ -479,31 +479,31 @@ static unsigned long slots_fetch_random(void)
return 0;
}
-static void process_e820_entry(struct boot_e820_entry *entry,
+static void process_e820_entry(struct mem_vector *entry,
unsigned long minimum,
unsigned long image_size)
{
struct mem_vector region, overlap;
struct slot_area slot_area;
unsigned long start_orig, end;
- struct boot_e820_entry cur_entry;
+ struct mem_vector cur_entry;
/* On 32-bit, ignore entries entirely above our maximum. */
- if (IS_ENABLED(CONFIG_X86_32) && entry->addr >= KERNEL_IMAGE_SIZE)
+ if (IS_ENABLED(CONFIG_X86_32) && entry->start >= KERNEL_IMAGE_SIZE)
return;
/* Ignore entries entirely below our minimum. */
- if (entry->addr + entry->size < minimum)
+ if (entry->start + entry->size < minimum)
return;
/* Ignore entries above memory limit */
- end = min(entry->size + entry->addr, mem_limit);
- if (entry->addr >= end)
+ end = min(entry->size + entry->start, mem_limit);
+ if (entry->start >= end)
return;
- cur_entry.addr = entry->addr;
- cur_entry.size = end - entry->addr;
+ cur_entry.start = entry->start;
+ cur_entry.size = end - entry->start;
- region.start = cur_entry.addr;
+ region.start = cur_entry.start;
region.size = cur_entry.size;
/* Give up if slot area array is full. */
@@ -518,7 +518,7 @@ static void process_e820_entry(struct boot_e820_entry *entry,
region.start = ALIGN(region.start, CONFIG_PHYSICAL_ALIGN);
/* Did we raise the address above this e820 region? */
- if (region.start > cur_entry.addr + cur_entry.size)
+ if (region.start > cur_entry.start + cur_entry.size)
return;
/* Reduce size by any delta from the original address. */
@@ -562,6 +562,7 @@ static void process_e820_entries(unsigned long minimum,
unsigned long image_size)
{
int i;
+ struct mem_vector region;
struct boot_e820_entry *entry;
/* Verify potential e820 positions, appending to slots list. */
@@ -570,7 +571,9 @@ static void process_e820_entries(unsigned long minimum,
/* Skip non-RAM entries. */
if (entry->type != E820_TYPE_RAM)
continue;
- process_e820_entry(entry, minimum, image_size);
+ region.start = entry->addr;
+ region.size = entry->size;
+ process_e820_entry(®ion, minimum, image_size);
if (slot_area_index == MAX_SLOT_AREA) {
debug_putstr("Aborted e820 scan (slot_areas full)!\n");
break;
--
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