[src/trunk]: src/sys/arch/x86/x86 Clean up, and add sanity checks on the micr...

[maxv <maxv%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/5e80d9bf5d04
branches:  trunk
changeset: 998990:5e80d9bf5d04
user:      maxv <maxv%NetBSD.org@localhost>
date:      Fri May 10 18:21:01 2019 +0000

description:
Clean up, and add sanity checks on the microcode lengths.

diffstat:

 sys/arch/x86/x86/cpu_ucode_intel.c |  136 ++++++++++++++++++------------------
 1 files changed, 67 insertions(+), 69 deletions(-)

diffs (224 lines):

diff -r 1bcaf79655a8 -r 5e80d9bf5d04 sys/arch/x86/x86/cpu_ucode_intel.c
--- a/sys/arch/x86/x86/cpu_ucode_intel.c        Fri May 10 18:07:10 2019 +0000
+++ b/sys/arch/x86/x86/cpu_ucode_intel.c        Fri May 10 18:21:01 2019 +0000
@@ -1,10 +1,11 @@
-/* $NetBSD: cpu_ucode_intel.c,v 1.16 2019/05/09 18:53:14 maxv Exp $ */
+/* $NetBSD: cpu_ucode_intel.c,v 1.17 2019/05/10 18:21:01 maxv Exp $ */
+
 /*
- * Copyright (c) 2012 The NetBSD Foundation, Inc.
+ * Copyright (c) 2012, 2019 The NetBSD Foundation, Inc.
  * All rights reserved.
  *
  * This code is derived from software contributed to The NetBSD Foundation
- * by Matthias Drochner.
+ * by Matthias Drochner and Maxime Villard.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -29,7 +30,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: cpu_ucode_intel.c,v 1.16 2019/05/09 18:53:14 maxv Exp $");
+__KERNEL_RCSID(0, "$NetBSD: cpu_ucode_intel.c,v 1.17 2019/05/10 18:21:01 maxv Exp $");
 
 #ifdef _KERNEL_OPT
 #include "opt_xen.h"
@@ -88,8 +89,8 @@
 {
        const char *fw_path = "cpu_x86_intel1";
        uint32_t ucodeversion, cpu_signature;
+       char cpuspec[11];
        int platformid;
-       char cpuspec[11];
 
        if (fwname != NULL && fwname[0] != '\0')
                return firmware_open(fw_path, fwname, fwh);
@@ -106,71 +107,68 @@
 }
 
 #ifndef XEN
-/* Check header version and checksum */
 static int
-cpu_ucode_intel_verify(struct intel1_ucode_header *buf)
+cpu_ucode_intel_verify(struct cpu_ucode_softc *sc,
+    struct intel1_ucode_header *buf)
 {
-       uint32_t data_size, total_size, payload_size, extended_table_size;
-#if 0 /* not yet */
-       struct intel1_ucode_ext_table *ext_table;
-       struct intel1_ucode_proc_signature *ext_psig;
-#endif
+       uint32_t data_size, total_size, payload_size, ext_size;
        uint32_t sum;
        int i;
-       
+
        if ((buf->uh_header_ver != 1) || (buf->uh_loader_rev != 1))
                return EINVAL;
 
-       /* Data size */
-       if (buf->uh_data_size == 0)
+       /*
+        * Data size.
+        */
+       if (buf->uh_data_size == 0) {
                data_size = 2000;
-       else
+       } else {
                data_size = buf->uh_data_size;
-
-       if ((data_size % 4) != 0) {
-               /* Wrong size */
-               return EINVAL;
        }
-
-       /* Total size */
-       if (buf->uh_total_size == 0)
-               total_size = data_size + 48;
-       else
-               total_size = buf->uh_total_size;
-
-       if ((total_size % 1024) != 0) {
-               /* Wrong size */
+       if ((data_size % 4) != 0)
                return EINVAL;
-       }
-
-       payload_size = data_size + 48;
-
-       /* Extended table size */
-       extended_table_size = total_size - payload_size;
+       if (data_size > sc->sc_blobsize)
+               return EINVAL;
 
        /*
-        * Verify checksum of update data and header
-        * (exclude extended signature).
+        * Total size.
+        */
+       if (buf->uh_total_size == 0) {
+               total_size = data_size + 48;
+       } else {
+               total_size = buf->uh_total_size;
+       }
+       if ((total_size % 1024) != 0)
+               return EINVAL;
+       if (total_size > sc->sc_blobsize)
+               return EINVAL;
+
+       /*
+        * Payload size.
+        */
+       payload_size = data_size + 48;
+       if (payload_size > sc->sc_blobsize)
+               return EINVAL;
+
+       /*
+        * Verify checksum of update data and header. Exclude extended
+        * signature.
         */
        sum = 0;
-       for (i = 0; i < (payload_size / sizeof(uint32_t)); i++)
+       for (i = 0; i < (payload_size / sizeof(uint32_t)); i++) {
                sum += *((uint32_t *)buf + i);
-       if (sum != 0) {
-               /* Checksum mismatch */
+       }
+       if (sum != 0)
                return EINVAL;
-       }
 
-       if (extended_table_size == 0)
-               return 0;
-
-#if 0
-       /* Verify extended signature's checksum */
-       ext_table = (void *)buf + payload_size;
-       ext_psig = (void *)ext_table + sizeof(struct intel1_ucode_ext_table);
-       printf("ext_table = %p, extsig = %p\n", ext_table, ext_psig);
-#else
-       printf("This image has extended signature table.");
-#endif
+       /*
+        * Extended table size. Ignored for now.
+        */
+       ext_size = total_size - payload_size;
+       if (ext_size > 0) {
+               printf("This image has extended signature table.");
+       }
 
        return 0;
 }
@@ -179,29 +177,28 @@
 cpu_ucode_intel_apply(struct cpu_ucode_softc *sc, int cpuno)
 {
        uint32_t ucodetarget, oucodeversion, nucodeversion;
-       int platformid, cpuid;
        struct intel1_ucode_header *uh;
-       void *uha;
+       int platformid, cpuid, error;
        size_t newbufsize = 0;
-       int rv = 0;
+       void *uha;
 
-       if (sc->loader_version != CPU_UCODE_LOADER_INTEL1
-           || cpuno != CPU_UCODE_CURRENT_CPU)
+       if (sc->loader_version != CPU_UCODE_LOADER_INTEL1 ||
+           cpuno != CPU_UCODE_CURRENT_CPU)
                return EINVAL;
 
-       uh = (struct intel1_ucode_header *)(sc->sc_blob);
-       rv = cpu_ucode_intel_verify(uh);
-       if (rv != 0)
-               return EINVAL;
+       uh = (struct intel1_ucode_header *)sc->sc_blob;
+
+       error = cpu_ucode_intel_verify(sc, uh);
+       if (error != 0)
+               return error;
 
        ucodetarget = uh->uh_rev;
 
-       if ((uintptr_t)(sc->sc_blob) & 15) {
-               /* Make the buffer 16 byte aligned */
+       if (((uintptr_t)sc->sc_blob) & 15) {
+               /* Make the buffer 16 byte aligned. */
                newbufsize = sc->sc_blobsize + 15;
                uha = kmem_alloc(newbufsize, KM_SLEEP);
                uh = (struct intel1_ucode_header *)roundup2((uintptr_t)uha, 16);
-               /* Copy to the new area */
                memcpy(uh, sc->sc_blob, sc->sc_blobsize);
        }
 
@@ -210,7 +207,7 @@
        intel_getcurrentucode(&oucodeversion, &platformid);
        if (oucodeversion >= ucodetarget) {
                kpreempt_enable();
-               rv = EEXIST; /* ??? */
+               error = EEXIST;
                goto out;
        }
 
@@ -227,15 +224,16 @@
        kpreempt_enable();
 
        if (nucodeversion != ucodetarget) {
-               rv = EIO;
+               error = EIO;
                goto out;
        }
 
-       printf("cpu %d: ucode 0x%x->0x%x\n", cpuid,
-              oucodeversion, nucodeversion);
+       printf("cpu %d: ucode 0x%x->0x%x\n", cpuid, oucodeversion,
+           nucodeversion);
+
 out:
        if (newbufsize != 0)
                kmem_free(uha, newbufsize);
-       return rv;
+       return error;
 }
 #endif /* ! XEN */