1 files changed, 371 insertions, 0 deletions
diff --git a/scripts/coverity-scan/model.c b/scripts/coverity-scan/model.c
new file mode 100644
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+++ b/scripts/coverity-scan/model.c
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+/* Coverity Scan model
+ *
+ * Copyright (C) 2014 Red Hat, Inc.
+ *
+ * Authors:
+ *  Markus Armbruster <armbru@redhat.com>
+ *  Paolo Bonzini <pbonzini@redhat.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or, at your
+ * option, any later version.  See the COPYING file in the top-level directory.
+ */
+
+
+/*
+ * This is the source code for our Coverity user model file.  The
+ * purpose of user models is to increase scanning accuracy by explaining
+ * code Coverity can't see (out of tree libraries) or doesn't
+ * sufficiently understand.  Better accuracy means both fewer false
+ * positives and more true defects.  Memory leaks in particular.
+ *
+ * - A model file can't import any header files.  Some built-in primitives are
+ *   available but not wchar_t, NULL etc.
+ * - Modeling doesn't need full structs and typedefs. Rudimentary structs
+ *   and similar types are sufficient.
+ * - An uninitialized local variable signifies that the variable could be
+ *   any value.
+ *
+ * The model file must be uploaded by an admin in the analysis settings of
+ * http://scan.coverity.com/projects/378
+ */
+
+#define NULL ((void *)0)
+
+typedef unsigned char uint8_t;
+typedef char int8_t;
+typedef unsigned int uint32_t;
+typedef int int32_t;
+typedef long ssize_t;
+typedef unsigned long long uint64_t;
+typedef long long int64_t;
+typedef _Bool bool;
+
+typedef struct va_list_str *va_list;
+
+/* exec.c */
+
+typedef struct AddressSpace AddressSpace;
+typedef struct MemoryRegionCache MemoryRegionCache;
+typedef uint64_t hwaddr;
+typedef uint32_t MemTxResult;
+typedef struct MemTxAttrs {} MemTxAttrs;
+
+static void __bufwrite(uint8_t *buf, ssize_t len)
+{
+    int first, last;
+    __coverity_negative_sink__(len);
+    if (len == 0) return;
+    buf[0] = first;
+    buf[len-1] = last;
+    __coverity_writeall__(buf);
+}
+
+static void __bufread(uint8_t *buf, ssize_t len)
+{
+    __coverity_negative_sink__(len);
+    if (len == 0) return;
+    int first = buf[0];
+    int last = buf[len-1];
+}
+
+MemTxResult address_space_read_cached(MemoryRegionCache *cache, hwaddr addr,
+                                      MemTxAttrs attrs,
+                                      void *buf, int len)
+{
+    MemTxResult result;
+    // TODO: investigate impact of treating reads as producing
+    // tainted data, with __coverity_tainted_data_argument__(buf).
+    __bufwrite(buf, len);
+    return result;
+}
+
+MemTxResult address_space_write_cached(MemoryRegionCache *cache, hwaddr addr,
+                                MemTxAttrs attrs,
+                                const void *buf, int len)
+{
+    MemTxResult result;
+    __bufread(buf, len);
+    return result;
+}
+
+MemTxResult address_space_rw_cached(MemoryRegionCache *cache, hwaddr addr,
+                                    MemTxAttrs attrs,
+                                    void *buf, int len, bool is_write)
+{
+    if (is_write) {
+        return address_space_write_cached(cache, addr, attrs, buf, len);
+    } else {
+        return address_space_read_cached(cache, addr, attrs, buf, len);
+    }
+}
+
+MemTxResult address_space_read(AddressSpace *as, hwaddr addr,
+                               MemTxAttrs attrs,
+                               void *buf, int len)
+{
+    MemTxResult result;
+    // TODO: investigate impact of treating reads as producing
+    // tainted data, with __coverity_tainted_data_argument__(buf).
+    __bufwrite(buf, len);
+    return result;
+}
+
+MemTxResult address_space_write(AddressSpace *as, hwaddr addr,
+                                MemTxAttrs attrs,
+                                const void *buf, int len)
+{
+    MemTxResult result;
+    __bufread(buf, len);
+    return result;
+}
+
+MemTxResult address_space_rw(AddressSpace *as, hwaddr addr,
+                             MemTxAttrs attrs,
+                             void *buf, int len, bool is_write)
+{
+    if (is_write) {
+        return address_space_write(as, addr, attrs, buf, len);
+    } else {
+        return address_space_read(as, addr, attrs, buf, len);
+    }
+}
+
+/* Tainting */
+
+typedef struct {} name2keysym_t;
+static int get_keysym(const name2keysym_t *table,
+                      const char *name)
+{
+    int result;
+    if (result > 0) {
+        __coverity_tainted_string_sanitize_content__(name);
+        return result;
+    } else {
+        return 0;
+    }
+}
+
+/* Replay data is considered trusted.  */
+uint8_t replay_get_byte(void)
+{
+    uint8_t byte;
+    return byte;
+}
+
+
+/*
+ * GLib memory allocation functions.
+ *
+ * Note that we ignore the fact that g_malloc of 0 bytes returns NULL,
+ * and g_realloc of 0 bytes frees the pointer.
+ *
+ * Modeling this would result in Coverity flagging a lot of memory
+ * allocations as potentially returning NULL, and asking us to check
+ * whether the result of the allocation is NULL or not.  However, the
+ * resulting pointer should never be dereferenced anyway, and in fact
+ * it is not in the vast majority of cases.
+ *
+ * If a dereference did happen, this would suppress a defect report
+ * for an actual null pointer dereference.  But it's too unlikely to
+ * be worth wading through the false positives, and with some luck
+ * we'll get a buffer overflow reported anyway.
+ */
+
+/*
+ * Allocation primitives, cannot return NULL
+ * See also Coverity's library/generic/libc/all/all.c
+ */
+
+void *g_malloc_n(size_t nmemb, size_t size)
+{
+    void *ptr;
+
+    __coverity_negative_sink__(nmemb);
+    __coverity_negative_sink__(size);
+    ptr = __coverity_alloc__(nmemb * size);
+    if (!ptr) {
+        __coverity_panic__();
+    }
+    __coverity_mark_as_uninitialized_buffer__(ptr);
+    __coverity_mark_as_afm_allocated__(ptr, AFM_free);
+    return ptr;
+}
+
+void *g_malloc0_n(size_t nmemb, size_t size)
+{
+    void *ptr;
+
+    __coverity_negative_sink__(nmemb);
+    __coverity_negative_sink__(size);
+    ptr = __coverity_alloc__(nmemb * size);
+    if (!ptr) {
+        __coverity_panic__();
+    }
+    __coverity_writeall0__(ptr);
+    __coverity_mark_as_afm_allocated__(ptr, AFM_free);
+    return ptr;
+}
+
+void *g_realloc_n(void *ptr, size_t nmemb, size_t size)
+{
+    __coverity_negative_sink__(nmemb);
+    __coverity_negative_sink__(size);
+    __coverity_escape__(ptr);
+    ptr = __coverity_alloc__(nmemb * size);
+    if (!ptr) {
+        __coverity_panic__();
+    }
+    /*
+     * Memory beyond the old size isn't actually initialized.  Can't
+     * model that.  See Coverity's realloc() model
+     */
+    __coverity_writeall__(ptr);
+    __coverity_mark_as_afm_allocated__(ptr, AFM_free);
+    return ptr;
+}
+
+void g_free(void *ptr)
+{
+    __coverity_free__(ptr);
+    __coverity_mark_as_afm_freed__(ptr, AFM_free);
+}
+
+/*
+ * Derive the g_try_FOO_n() from the g_FOO_n() by adding indeterminate
+ * out of memory conditions
+ */
+
+void *g_try_malloc_n(size_t nmemb, size_t size)
+{
+    int nomem;
+
+    if (nomem) {
+        return NULL;
+    }
+    return g_malloc_n(nmemb, size);
+}
+
+void *g_try_malloc0_n(size_t nmemb, size_t size)
+{
+    int nomem;
+
+    if (nomem) {
+        return NULL;
+    }
+    return g_malloc0_n(nmemb, size);
+}
+
+void *g_try_realloc_n(void *ptr, size_t nmemb, size_t size)
+{
+    int nomem;
+
+    if (nomem) {
+        return NULL;
+    }
+    return g_realloc_n(ptr, nmemb, size);
+}
+
+/* Derive the g_FOO() from the g_FOO_n() */
+
+void *g_malloc(size_t size)
+{
+    void *ptr;
+
+    __coverity_negative_sink__(size);
+    ptr = __coverity_alloc__(size);
+    if (!ptr) {
+        __coverity_panic__();
+    }
+    __coverity_mark_as_uninitialized_buffer__(ptr);
+    __coverity_mark_as_afm_allocated__(ptr, AFM_free);
+    return ptr;
+}
+
+void *g_malloc0(size_t size)
+{
+    void *ptr;
+
+    __coverity_negative_sink__(size);
+    ptr = __coverity_alloc__(size);
+    if (!ptr) {
+        __coverity_panic__();
+    }
+    __coverity_writeall0__(ptr);
+    __coverity_mark_as_afm_allocated__(ptr, AFM_free);
+    return ptr;
+}
+
+void *g_realloc(void *ptr, size_t size)
+{
+    __coverity_negative_sink__(size);
+    __coverity_escape__(ptr);
+    ptr = __coverity_alloc__(size);
+    if (!ptr) {
+        __coverity_panic__();
+    }
+    /*
+     * Memory beyond the old size isn't actually initialized.  Can't
+     * model that.  See Coverity's realloc() model
+     */
+    __coverity_writeall__(ptr);
+    __coverity_mark_as_afm_allocated__(ptr, AFM_free);
+    return ptr;
+}
+
+void *g_try_malloc(size_t size)
+{
+    int nomem;
+
+    if (nomem) {
+        return NULL;
+    }
+    return g_malloc(size);
+}
+
+void *g_try_malloc0(size_t size)
+{
+    int nomem;
+
+    if (nomem) {
+        return NULL;
+    }
+    return g_malloc0(size);
+}
+
+void *g_try_realloc(void *ptr, size_t size)
+{
+    int nomem;
+
+    if (nomem) {
+        return NULL;
+    }
+    return g_realloc(ptr, size);
+}
+
+/* Other glib functions */
+
+typedef struct pollfd GPollFD;
+
+int poll();
+
+int g_poll (GPollFD *fds, unsigned nfds, int timeout)
+{
+    return poll(fds, nfds, timeout);
+}
+
+typedef struct _GIOChannel GIOChannel;
+GIOChannel *g_io_channel_unix_new(int fd)
+{
+    GIOChannel *c = g_malloc0(sizeof(GIOChannel));
+    __coverity_escape__(fd);
+    return c;
+}
+
+void g_assertion_message_expr(const char     *domain,
+                              const char     *file,
+                              int             line,
+                              const char     *func,
+                              const char     *expr)
+{
+    __coverity_panic__();
+}