x86/microcode/AMD: Fix load of builtin microcode with randomized memory

We do not need to add the randomization offset when the microcode is
built in.

Reported-and-tested-by: Emanuel Czirai <icanrealizeum@gmail.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: http://lkml.kernel.org/r/20160904093736.GA11939@pd.tnic
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 10 insertions, 3 deletions

diff --git a/arch/x86/kernel/cpu/microcode/amd.c b/arch/x86/kernel/cpu/microcode/amd.c
index b816971f5da4..620ab06bcf45 100644
--- a/arch/x86/kernel/cpu/microcode/amd.c
+++ b/arch/x86/kernel/cpu/microcode/amd.c
@@ -54,6 +54,7 @@ static LIST_HEAD(pcache);
  */
 static u8 *container;
 static size_t container_size;
+static bool ucode_builtin;
 
 static u32 ucode_new_rev;
 static u8 amd_ucode_patch[PATCH_MAX_SIZE];
@@ -281,18 +282,22 @@ static bool __init load_builtin_amd_microcode(struct cpio_data *cp,
 void __init load_ucode_amd_bsp(unsigned int family)
 {
         struct cpio_data cp;
+        bool *builtin;
         void **data;
         size_t *size;
 
 #ifdef CONFIG_X86_32
         data =  (void **)__pa_nodebug(&ucode_cpio.data);
         size = (size_t *)__pa_nodebug(&ucode_cpio.size);
+        builtin = (bool *)__pa_nodebug(&ucode_builtin);
 #else
         data = &ucode_cpio.data;
         size = &ucode_cpio.size;
+        builtin = &ucode_builtin;
 #endif
 
-        if (!load_builtin_amd_microcode(&cp, family))
+        *builtin = load_builtin_amd_microcode(&cp, family);
+        if (!*builtin)
                 cp = find_ucode_in_initrd();
 
         if (!(cp.data && cp.size))
@@ -373,7 +378,8 @@ void load_ucode_amd_ap(void)
                 return;
 
         /* Add CONFIG_RANDOMIZE_MEMORY offset. */
-        cont += PAGE_OFFSET - __PAGE_OFFSET_BASE;
+        if (!ucode_builtin)
+                cont += PAGE_OFFSET - __PAGE_OFFSET_BASE;
 
         eax = cpuid_eax(0x00000001);
         eq  = (struct equiv_cpu_entry *)(cont + CONTAINER_HDR_SZ);
@@ -439,7 +445,8 @@ int __init save_microcode_in_initrd_amd(void)
                 container = cont_va;
 
         /* Add CONFIG_RANDOMIZE_MEMORY offset. */
-        container += PAGE_OFFSET - __PAGE_OFFSET_BASE;
+        if (!ucode_builtin)
+                container += PAGE_OFFSET - __PAGE_OFFSET_BASE;
 
         eax   = cpuid_eax(0x00000001);
         eax   = ((eax >> 8) & 0xf) + ((eax >> 20) & 0xff);