From: Ram Pai <linuxram@xxxxxxxxxx>
set_memory_decrypted() expects the number of PAGE_SIZE pages to decrypt.
kvmclock_init_mem() instead passes number of bytes. This decrypts a huge
number of pages resulting in data corruption.
Fixed it.
[ bauermann: Slightly reworded commit message and added Fixes: tag. ]
Fixes: 6a1cac56f41f ("x86/kvm: Use __bss_decrypted attribute in shared variables")
Signed-off-by: Ram Pai <linuxram@xxxxxxxxxx>
Signed-off-by: Thiago Jung Bauermann <bauerman@xxxxxxxxxxxxx>
---
arch/x86/kernel/kvmclock.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
Note: Found by code inspection. I don't have a way to test.
diff --git a/arch/x86/kernel/kvmclock.c b/arch/x86/kernel/kvmclock.c
index e811d4d1c824..b5c867dd2c8d 100644
--- a/arch/x86/kernel/kvmclock.c
+++ b/arch/x86/kernel/kvmclock.c
@@ -251,8 +251,7 @@ static void __init kvmclock_init_mem(void)
* be mapped decrypted.
*/
if (sev_active()) {
- r = set_memory_decrypted((unsigned long) hvclock_mem,
- 1UL << order);
+ r = set_memory_decrypted((unsigned long) hvclock_mem, 1);
if (r) {
__free_pages(p, order);
hvclock_mem = NULL;
