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authorPaolo Bonzini <pbonzini@redhat.com>2014-03-26 12:45:49 +0100
committerMichael Tokarev <mjt@tls.msk.ru>2014-04-18 10:33:36 +0400
commite40cdb0e6efb795e4d19368987d53e3e4ae19cf7 (patch)
tree2a4f426dee8364c1d190a8c91b414ba745edfb52 /scripts/coverity-model.c
parent968fc24d843c9e9b24231ca1960b47ef2fc724ea (diff)
scripts: add sample model file for Coverity Scan
This is the model file that is being used for the QEMU project's scans on scan.coverity.com. It fixed about 30 false positives (10% of the total) and exposed about 60 new memory leaks. The file is not automatically used; changes to it must be propagated to the website manually by an admin (right now Markus, Peter and me are admins). Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
Diffstat (limited to 'scripts/coverity-model.c')
-rw-r--r--scripts/coverity-model.c183
1 files changed, 183 insertions, 0 deletions
diff --git a/scripts/coverity-model.c b/scripts/coverity-model.c
new file mode 100644
index 0000000000..4c99a85cfc
--- /dev/null
+++ b/scripts/coverity-model.c
@@ -0,0 +1,183 @@
+/* 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;
+
+/* exec.c */
+
+typedef struct AddressSpace AddressSpace;
+typedef uint64_t hwaddr;
+
+static void __write(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 __read(uint8_t *buf, ssize_t len)
+{
+ __coverity_negative_sink__(len);
+ if (len == 0) return;
+ int first = buf[0];
+ int last = buf[len-1];
+}
+
+bool address_space_rw(AddressSpace *as, hwaddr addr, uint8_t *buf,
+ int len, bool is_write)
+{
+ bool result;
+
+ // TODO: investigate impact of treating reads as producing
+ // tainted data, with __coverity_tainted_data_argument__(buf).
+ if (is_write) __write(buf, len); else __read(buf, len);
+
+ return result;
+}
+
+/* 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;
+ }
+}
+
+/* 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.
+ */
+
+void *malloc(size_t);
+void *calloc(size_t, size_t);
+void *realloc(void *, size_t);
+void free(void *);
+
+void *
+g_malloc(size_t n_bytes)
+{
+ void *mem;
+ __coverity_negative_sink__(n_bytes);
+ mem = malloc(n_bytes == 0 ? 1 : n_bytes);
+ if (!mem) __coverity_panic__();
+ return mem;
+}
+
+void *
+g_malloc0(size_t n_bytes)
+{
+ void *mem;
+ __coverity_negative_sink__(n_bytes);
+ mem = calloc(1, n_bytes == 0 ? 1 : n_bytes);
+ if (!mem) __coverity_panic__();
+ return mem;
+}
+
+void g_free(void *mem)
+{
+ free(mem);
+}
+
+void *g_realloc(void * mem, size_t n_bytes)
+{
+ __coverity_negative_sink__(n_bytes);
+ mem = realloc(mem, n_bytes == 0 ? 1 : n_bytes);
+ if (!mem) __coverity_panic__();
+ return mem;
+}
+
+void *g_try_malloc(size_t n_bytes)
+{
+ __coverity_negative_sink__(n_bytes);
+ return malloc(n_bytes == 0 ? 1 : n_bytes);
+}
+
+void *g_try_malloc0(size_t n_bytes)
+{
+ __coverity_negative_sink__(n_bytes);
+ return calloc(1, n_bytes == 0 ? 1 : n_bytes);
+}
+
+void *g_try_realloc(void *mem, size_t n_bytes)
+{
+ __coverity_negative_sink__(n_bytes);
+ return realloc(mem, n_bytes == 0 ? 1 : n_bytes);
+}
+
+/* Other glib functions */
+
+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__();
+}