linux-kernel - [tip:x86/boot] x86/boot/KASLR: Switch to pass struct mem_vector to process_e820

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Message-ID: <tip-87891b01b54210763117f0a67b022cd94de6cd13@git.kernel.org>
Date:   Tue, 18 Jul 2017 03:45:34 -0700
From:   tip-bot for Baoquan He <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     tglx@...utronix.de, bhe@...hat.com, peterz@...radead.org,
        hpa@...or.com, torvalds@...ux-foundation.org,
        keescook@...omium.org, linux-kernel@...r.kernel.org,
        mingo@...nel.org
Subject: [tip:x86/boot] x86/boot/KASLR: Switch to pass struct mem_vector to
 process_e820_entry()

Commit-ID:  87891b01b54210763117f0a67b022cd94de6cd13
Gitweb:     http://git.kernel.org/tip/87891b01b54210763117f0a67b022cd94de6cd13
Author:     Baoquan He <bhe@...hat.com>
AuthorDate: Sun, 9 Jul 2017 20:37:40 +0800
Committer:  Ingo Molnar <mingo@...nel.org>
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@...hat.com>
Acked-by: Kees Cook <keescook@...omium.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: fanc.fnst@...fujitsu.com
Cc: izumi.taku@...fujitsu.com
Cc: matt@...eblueprint.co.uk
Cc: thgarnie@...gle.com
Link: http://lkml.kernel.org/r/1499603862-11516-3-git-send-email-bhe@redhat.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 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(&region, minimum, image_size);
 		if (slot_area_index == MAX_SLOT_AREA) {
 			debug_putstr("Aborted e820 scan (slot_areas full)!\n");
 			break;