From e02cda008591317b1625707ff8e115a4841aa889 Mon Sep 17 00:00:00 2001
From: Timos Ampelikiotis <t.ampelikiotis@virtualopensystems.com>
Date: Tue, 10 Oct 2023 11:40:56 +0000
Subject: Introduce Virtio-loopback epsilon release:
Epsilon release introduces a new compatibility layer which make virtio-loopback
design to work with QEMU and rust-vmm vhost-user backend without require any
changes.
Signed-off-by: Timos Ampelikiotis <t.ampelikiotis@virtualopensystems.com>
Change-Id: I52e57563e08a7d0bdc002f8e928ee61ba0c53dd9
---
scripts/coverity-scan/model.c | 371 ++++++++++++++++++++++++++++++++++++++++++
1 file changed, 371 insertions(+)
create mode 100644 scripts/coverity-scan/model.c
(limited to 'scripts/coverity-scan/model.c')
diff --git a/scripts/coverity-scan/model.c b/scripts/coverity-scan/model.c
new file mode 100644
index 000000000..9d4fba53d
--- /dev/null
+++ b/scripts/coverity-scan/model.c
@@ -0,0 +1,371 @@
+/* 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__();
+}
--
cgit