tools/libxc: Fix issues with libxc and Xen having different featureset lengths

In almost all cases, Xen and libxc will agree on the featureset length,
because they are built from the same source.

However, there are circumstances (e.g. security hotfixes) where the featureset
gets longer and dom0 will, after installing updates, be running with an old
Xen but new libxc.  Despite writing the code with this scenario in mind, there
were some bugs.

First, xen-cpuid's get_featureset() erroneously allocates a buffer based on
Xen's featureset length, but records libxc's length, which may be longer.

In this situation, the hypercall bounce buffer code reads/writes the recorded
length, which is beyond the end of the allocated object, and a later free()
encounters corrupt heap metadata.  Fix this by recording the same length that
we allocate.

Secondly, get_cpuid_domain_info() has a related bug when the passed-in
featureset is a different length to libxc's.

A large amount of the libxc cpuid functionality depends on info->featureset
being as long as expected, and it is allocated appropriately.  However, in the
case that a shorter external featureset is passed in, the logic to check for
trailing nonzero bits may read off the end of it.  Rework the logic to use the
correct upper bound.

In addition, leave a comment next to the fields in struct cpuid_domain_info
explaining the relationship between the various lengths, and how to cope with
different lengths.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Wei Liu <wei.liu2@citrix.com>
(cherry picked from commit c393b64dcee6684da25257b033148740cb6d7ff0)

diff --git a/tools/libxc/xc_cpuid_x86.c b/tools/libxc/xc_cpuid_x86.c
index 21537f06f163ccc98687a06c624c009c45d9caf8..e62f920797af40641a8c191640d15d65ae5be169 100644 (file)
--- a/tools/libxc/xc_cpuid_x86.c
+++ b/tools/libxc/xc_cpuid_x86.c
@@ -169,6 +169,18 @@ struct cpuid_domain_info
     bool hvm;
     uint64_t xfeature_mask;
 
+    /*
+     * Careful with featureset lengths.
+     *
+     * Code in this file requires featureset to have at least
+     * xc_get_cpu_featureset_size() entries.  This is a libxc compiletime
+     * constant.
+     *
+     * The featureset length used by the hypervisor may be different.  If the
+     * hypervisor version is longer, XEN_SYSCTL_get_cpu_featureset will fail
+     * with -ENOBUFS, and libxc really does need rebuilding.  If the
+     * hypervisor version is shorter, it is safe to zero-extend.
+     */
     uint32_t *featureset;
     unsigned int nr_features;
 
@@ -239,11 +251,18 @@ static int get_cpuid_domain_info(xc_interface *xch, uint32_t domid,
 
     if ( featureset )
     {
+        /*
+         * The user supplied featureset may be shorter or longer than
+         * host_nr_features.  Shorter is fine, and we will zero-extend.
+         * Longer is fine, so long as it only padded with zeros.
+         */
+        unsigned int fslen = min(host_nr_features, nr_features);
+
         memcpy(info->featureset, featureset,
-               min(host_nr_features, nr_features) * sizeof(*info->featureset));
+               fslen * sizeof(*info->featureset));
 
         /* Check for truncated set bits. */
-        for ( i = nr_features; i < host_nr_features; ++i )
+        for ( i = fslen; i < nr_features; ++i )
             if ( featureset[i] != 0 )
                 return -EOPNOTSUPP;
     }

diff --git a/tools/misc/xen-cpuid.c b/tools/misc/xen-cpuid.c
index 16697c4a82105fa6db092b38587ae72779701021..4c9af6b7f07cbce4368673e145db20454dd2dd6e 100644 (file)
--- a/tools/misc/xen-cpuid.c
+++ b/tools/misc/xen-cpuid.c
@@ -230,7 +230,7 @@ static void get_featureset(xc_interface *xch, unsigned int idx)
 {
     struct fsinfo *f = &featuresets[idx];
 
-    f->len = xc_get_cpu_featureset_size();
+    f->len = nr_features;
     f->fs = calloc(nr_features, sizeof(*f->fs));
 
     if ( !f->fs )