From 621a7ebe5818033527d67564e538f1dc0caf5e22 Mon Sep 17 00:00:00 2001 From: Richard Yao Date: Thu, 15 Sep 2022 14:50:19 -0400 Subject: [PATCH] Add coverity model to repository Other projects such as the python project include their coverity models in their repositories. This provides transparency, which is beneficial in open source projects. Therefore, it is a good idea to include the coverity model in our repository too. Reviewed-by: Brian Behlendorf Signed-off-by: Richard Yao Closes #13884 --- contrib/coverity/model.c | 407 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 407 insertions(+) create mode 100644 contrib/coverity/model.c diff --git a/contrib/coverity/model.c b/contrib/coverity/model.c new file mode 100644 index 000000000..ee2d01e7f --- /dev/null +++ b/contrib/coverity/model.c @@ -0,0 +1,407 @@ +/* + * Coverity Scan model + * https://scan.coverity.com/models + * + * This is a modeling file for Coverity Scan. + * Modeling helps to avoid false positives. + * + * - Modeling doesn't need full structs and typedefs. Rudimentary structs + * and similar types are sufficient. + * - An uninitialized local pointer is not an error. It signifies that the + * variable could be either NULL or have some data. + * + * Coverity Scan doesn't pick up modifications automatically. The model file + * must be uploaded by an admin in the analysis settings. + * + * Some of this initially cribbed from: + * + * https://github.com/kees/coverity-linux/blob/trunk/model.c + * + * The below model was based on the original model by Brian Behlendorf for the + * original zfsonlinux/zfs repository. Some inspiration was taken from + * kees/coverity-linux, specifically involving memory copies. + */ + +#include + +#define UMEM_DEFAULT 0x0000 /* normal -- may fail */ +#define UMEM_NOFAIL 0x0100 /* Never fails */ + +#define NULL (0) + +int condition0, condition1; + +void +abort() +{ + __coverity_panic__(); +} + +void +exit(int status) +{ + (void) status; + + __coverity_panic__(); +} + +void +_exit(int status) +{ + (void) status; + + __coverity_panic__(); +} + +void +zed_log_die(const char *fmt, ...) +{ + __coverity_format_string_sink__(fmt); + __coverity_panic__(); +} + +void +panic(const char *fmt, ...) +{ + __coverity_format_string_sink__(fmt); + __coverity_panic__(); +} + +void +vpanic(const char *fmt, va_list adx) +{ + (void) fmt; + (void) adx; + + __coverity_panic__(); +} + +int +ddi_copyin(const void *from, void *to, size_t len, int flags) +{ + __coverity_tainted_data_argument__(from); + __coverity_tainted_data_argument__(to); + __coverity_writeall__(to); +} + +void * +memset(void *dst, int c, size_t len) +{ + __coverity_writeall__(dst); + return (dst); +} + +void * +memmove(void *dst, void *src, size_t len) +{ + __coverity_writeall__(dst); + return (dst); +} + +void * +memcpy(void *dst, void *src, size_t len) +{ + __coverity_writeall__(dst); + return (dst); +} + +void * +umem_alloc_aligned(size_t size, size_t align, int kmflags) +{ + (void) align; + + if (UMEM_NOFAIL & kmflags == UMEM_NOFAIL) + return (__coverity_alloc__(size)); + else if (condition0) + return (__coverity_alloc__(size)); + else + return (NULL); +} + +void * +umem_alloc(size_t size, int kmflags) +{ + if (UMEM_NOFAIL & kmflags == UMEM_NOFAIL) + return (__coverity_alloc__(size)); + else if (condition0) + return (__coverity_alloc__(size)); + else + return (NULL); +} + +void * +umem_zalloc(size_t size, int kmflags) +{ + if (UMEM_NOFAIL & kmflags == UMEM_NOFAIL) + return (__coverity_alloc__(size)); + else if (condition0) + return (__coverity_alloc__(size)); + else + return (NULL); +} + +void +umem_free(void *buf, size_t size) +{ + (void) size; + + __coverity_free__(buf); +} + +void * +spl_kmem_alloc(size_t sz, int fl, const char *func, int line) +{ + (void) func; + (void) line; + + if (condition1) + __coverity_sleep__(); + + if (fl == 0) { + return (__coverity_alloc__(sz)); + } else if (condition0) + return (__coverity_alloc__(sz)); + else + return (NULL); +} + +void * +spl_kmem_zalloc(size_t sz, int fl, const char *func, int line) +{ + (void) func; + (void) line; + + if (condition1) + __coverity_sleep__(); + + if (fl == 0) { + return (__coverity_alloc__(sz)); + } else if (condition0) + return (__coverity_alloc__(sz)); + else + return (NULL); +} + +void +spl_kmem_free(const void *ptr, size_t sz) +{ + (void) sz; + + __coverity_free__(ptr); +} + +typedef struct {} spl_kmem_cache_t; + +void * +spl_kmem_cache_alloc(spl_kmem_cache_t *skc, int flags) +{ + (void) skc; + + if (condition1) + __coverity_sleep__(); + + if (flags == 0) { + return (__coverity_alloc_nosize__()); + } else if (condition0) + return (__coverity_alloc_nosize__()); + else + return (NULL); +} + +void +spl_kmem_cache_free(spl_kmem_cache_t *skc, void *obj) +{ + (void) skc; + + __coverity_free__(obj); +} + +void +malloc(size_t size) +{ + __coverity_alloc__(size); +} + +void +free(void *buf) +{ + __coverity_free__(buf); +} + +int +spl_panic(const char *file, const char *func, int line, const char *fmt, ...) +{ + __coverity_format_string_sink__(fmt); + __coverity_panic__(); +} + +int +sched_yield(void) +{ + __coverity_sleep__(); +} + +typedef struct {} kmutex_t; +typedef struct {} krwlock_t; +typedef int krw_t; + +/* + * Coverty reportedly does not support macros, so this only works for + * userspace. + */ + +void +mutex_enter(kmutex_t *mp) +{ + if (condition0) + __coverity_sleep__(); + + __coverity_exclusive_lock_acquire__(mp); +} + +int +mutex_tryenter(kmutex_t *mp) +{ + if (condition0) { + __coverity_exclusive_lock_acquire__(mp); + return (1); + } + + return (0); +} + +void +mutex_exit(kmutex_t *mp) +{ + __coverity_exclusive_lock_release__(mp); +} + +void +rw_enter(krwlock_t *rwlp, krw_t rw) +{ + (void) rw; + + if (condition0) + __coverity_sleep__(); + + __coverity_recursive_lock_acquire__(rwlp); +} + +void +rw_exit(krwlock_t *rwlp) +{ + __coverity_recursive_lock_release__(rwlp); + +} + +int +rw_tryenter(krwlock_t *rwlp, krw_t rw) +{ + if (condition0) { + __coverity_recursive_lock_acquire__(rwlp); + return (1); + } + + return (0); +} + +/* Thus, we fallback to the Linux kernel locks */ +struct {} mutex; +struct {} rw_semaphore; + +void +mutex_lock(struct mutex *lock) +{ + if (condition0) { + __coverity_sleep__(); + } + __coverity_exclusive_lock_acquire__(lock); +} + +void +mutex_unlock(struct mutex *lock) +{ + __coverity_exclusive_lock_release__(lock); +} + +void +down_read(struct rw_semaphore *sem) +{ + if (condition0) { + __coverity_sleep__(); + } + __coverity_recursive_lock_acquire__(sem); +} + +void +down_write(struct rw_semaphore *sem) +{ + if (condition0) { + __coverity_sleep__(); + } + __coverity_recursive_lock_acquire__(sem); +} + +int +down_read_trylock(struct rw_semaphore *sem) +{ + if (condition0) { + __coverity_recursive_lock_acquire__(sem); + return (1); + } + + return (0); +} + +int +down_write_trylock(struct rw_semaphore *sem) +{ + if (condition0) { + __coverity_recursive_lock_acquire__(sem); + return (1); + } + + return (0); +} + +void +up_read(struct rw_semaphore *sem) +{ + __coverity_recursive_lock_release__(sem); +} + +void +up_write(struct rw_semaphore *sem) +{ + __coverity_recursive_lock_release__(sem); +} + +int +__cond_resched(void) +{ + if (condition0) { + __coverity_sleep__(); + } +} + +/* + * An endian-independent filesystem must support doing byte swaps on data. We + * attempt to suppress taint warnings, which are false positives for us. + */ +void +byteswap_uint64_array(void *vbuf, size_t size) +{ + __coverity_tainted_data_sanitize__(vbuf); +} + +void +byteswap_uint32_array(void *vbuf, size_t size) +{ + __coverity_tainted_data_sanitize__(vbuf); +} + +void +byteswap_uint16_array(void *vbuf, size_t size) +{ + __coverity_tainted_data_sanitize__(vbuf); +}