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Subject[PATCH] [10/45] x86_64: x86_64 Sanitize user specified e820 memmap values
Date

From: Vladimir Berezniker <vmpn@hitechman.com>

Sanitize user specified e820 memory ranges, using the same logic that
is applied to the values returned by the BIOS. This ensures
consistent handling regardless of the source of the memory mappings.

Allows overriding portions of the memory map without specifying one in
it's entirety (memmap=exactmap).

E.g. marking a range of bad RAM as reserved with memmap=48M$528M

BIOS supplied range

BIOS-e820: 0000000000100000 - 000000007fe80000 (usable)
becomes

user: 0000000000100000 - 0000000021000000 (usable)
user: 0000000021000000 - 0000000024000000 (reserved)
user: 0000000024000000 - 000000007fe80000 (usable)
Previously this did not work, as the original BIOS range was left
untouched while the user defined range was appended to the end of the
memory map.

Signed-off-by: Vladimir Berezniker <vmpn@hitechman.com>
Signed-off-by: Andi Kleen <ak@suse.de>


---
arch/x86_64/kernel/e820.c | 7 +++++++
1 file changed, 7 insertions(+)
Index: linux/arch/x86_64/kernel/e820.c
===================================================================
--- linux.orig/arch/x86_64/kernel/e820.c
+++ linux/arch/x86_64/kernel/e820.c
@@ -639,6 +639,8 @@ static int __init parse_memmap_opt(char
mem_size = memparse(p, &p);
if (p == oldp)
return -EINVAL;
+
+ userdef = 1;
if (*p == '@') {
start_at = memparse(p+1, &p);
add_memory_region(start_at, mem_size, E820_RAM);
@@ -658,6 +660,11 @@ early_param("memmap", parse_memmap_opt);
void __init finish_e820_parsing(void)
{
if (userdef) {
+ char nr = e820.nr_map;
+ if (sanitize_e820_map(e820.map, &nr) < 0)
+ early_panic("Invalid user supplied memory map");
+ e820.nr_map = nr;
+
printk(KERN_INFO "user-defined physical RAM map:\n");
e820_print_map("user");
}
-
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