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@redhat.com>
Acked-by: Kees Cook <keescook@chromium.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: fanc.fnst@cn.fujitsu.com
Cc: izumi.taku@jp.fujitsu.com
Cc: matt@codeblueprint.co.uk
Cc: thgarnie@google.com
Link: http://lkml.kernel.org/r/1499603862-11516-3-git-send-email-bhe@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/arch/x86/boot/compressed/kaslr.c b/arch/x86/boot/compressed/kaslr.c
index 1485f48aeda18c03078e25606212b5d8724e3881..36ff9f729c43af13d73ea07e5897a759726d671a 100644 (file)
--- 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(&region, minimum, image_size);
                if (slot_area_index == MAX_SLOT_AREA) {
                        debug_putstr("Aborted e820 scan (slot_areas full)!\n");
                        break;