x86, amd-ucode: Check UCODE_MAGIC before loading the container file

Signed-off-by: Borislav Petkov <borislav.petkov@amd.com> Signed-off-by: Andreas Herrmann <andreas.herrmann3@amd.com> LKML-Reference: <20091029134552.GC30802@alberich.amd.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
mariux64 · Nov 10, 2009 · 506f90e · 506f90e
1 parent de2a47c
commit 506f90e
Showing 1 changed file with 6 additions and 0 deletions.
diff --git a/arch/x86/kernel/microcode_amd.c b/arch/x86/kernel/microcode_amd.c
@@ -317,6 +317,12 @@ static enum ucode_state request_microcode_fw(int cpu, struct device *device)
 		return UCODE_NFOUND;
 	}
 
+	if (*(u32 *)firmware->data != UCODE_MAGIC) {
+		printk(KERN_ERR "microcode: invalid UCODE_MAGIC (0x%08x)\n",
+		       *(u32 *)firmware->data);
+		return UCODE_ERROR;
+	}
+
 	ret = generic_load_microcode(cpu, firmware->data, firmware->size);
 
 	release_firmware(firmware);