/* 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 uint64_t hwaddr; typedef uint32_t MemTxResult; typedef uint64_t 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_rw(AddressSpace *as, hwaddr addr, MemTxAttrs attrs, uint8_t *buf, int len, bool is_write) { MemTxResult result; // TODO: investigate impact of treating reads as producing // tainted data, with __coverity_tainted_data_argument__(buf). if (is_write) __bufread(buf, len); else __bufwrite(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. */ /* * 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) { size_t sz; void *ptr; __coverity_negative_sink__(nmemb); __coverity_negative_sink__(size); sz = nmemb * size; ptr = __coverity_alloc__(sz); __coverity_mark_as_uninitialized_buffer__(ptr); __coverity_mark_as_afm_allocated__(ptr, "g_free"); return ptr; } void *g_malloc0_n(size_t nmemb, size_t size) { size_t sz; void *ptr; __coverity_negative_sink__(nmemb); __coverity_negative_sink__(size); sz = nmemb * size; ptr = __coverity_alloc__(sz); __coverity_writeall0__(ptr); __coverity_mark_as_afm_allocated__(ptr, "g_free"); return ptr; } void *g_realloc_n(void *ptr, size_t nmemb, size_t size) { size_t sz; __coverity_negative_sink__(nmemb); __coverity_negative_sink__(size); sz = nmemb * size; __coverity_escape__(ptr); ptr = __coverity_alloc__(sz); /* * 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, "g_free"); return ptr; } void g_free(void *ptr) { __coverity_free__(ptr); __coverity_mark_as_afm_freed__(ptr, "g_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); } /* Trivially derive the g_FOO() from the g_FOO_n() */ void *g_malloc(size_t size) { return g_malloc_n(1, size); } void *g_malloc0(size_t size) { return g_malloc0_n(1, size); } void *g_realloc(void *ptr, size_t size) { return g_realloc_n(ptr, 1, size); } void *g_try_malloc(size_t size) { return g_try_malloc_n(1, size); } void *g_try_malloc0(size_t size) { return g_try_malloc0_n(1, size); } void *g_try_realloc(void *ptr, size_t size) { return g_try_realloc_n(ptr, 1, size); } /* * GLib string allocation functions */ char *g_strdup(const char *s) { char *dup; size_t i; if (!s) { return NULL; } __coverity_string_null_sink__(s); __coverity_string_size_sink__(s); dup = __coverity_alloc_nosize__(); __coverity_mark_as_afm_allocated__(dup, "g_free"); for (i = 0; (dup[i] = s[i]); i++) ; return dup; } char *g_strndup(const char *s, size_t n) { char *dup; size_t i; __coverity_negative_sink__(n); if (!s) { return NULL; } dup = g_malloc(n + 1); for (i = 0; i < n && (dup[i] = s[i]); i++) ; dup[i] = 0; return dup; } char *g_strdup_printf(const char *format, ...) { char ch, *s; size_t len; __coverity_string_null_sink__(format); __coverity_string_size_sink__(format); ch = *format; s = __coverity_alloc_nosize__(); __coverity_writeall__(s); __coverity_mark_as_afm_allocated__(s, "g_free"); return s; } char *g_strdup_vprintf(const char *format, va_list ap) { char ch, *s; size_t len; __coverity_string_null_sink__(format); __coverity_string_size_sink__(format); ch = *format; ch = *(char *)ap; s = __coverity_alloc_nosize__(); __coverity_writeall__(s); __coverity_mark_as_afm_allocated__(s, "g_free"); return len; } char *g_strconcat(const char *s, ...) { char *s; /* * Can't model: last argument must be null, the others * null-terminated strings */ s = __coverity_alloc_nosize__(); __coverity_writeall__(s); __coverity_mark_as_afm_allocated__(s, "g_free"); return s; } /* 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__(); }