Coverity model file update
Upon review, it was found that the model for malloc() was incorrect. In addition, several general purpose memory allocation functions were missing models: * kmem_vasprintf() * kmem_asprintf() * kmem_strdup() * kmem_strfree() * spl_vmem_alloc() * spl_vmem_zalloc() * spl_vmem_free() * calloc() As an experiment to try to find more bugs, some less than general purpose memory allocation functions were also given models: * zfsvfs_create() * zfsvfs_free() * nvlist_alloc() * nvlist_dup() * nvlist_free() * nvlist_pack() * nvlist_unpack() Finally, the models were improved using additional coverity primitives: * __coverity_negative_sink__() * __coverity_writeall0__() * __coverity_mark_as_uninitialized_buffer__() * __coverity_mark_as_afm_allocated__() In addition, an attempt to inform coverity that certain modelled functions read entire buffers was used by adding the following to certain models: int first = buf[0]; int last = buf[buflen-1]; It was inspired by the QEMU model file. No additional false positives were found by this, but it is believed that the more accurate model file will help to catch false positives in the future. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Richard Yao <richard.yao@alumni.stonybrook.edu> Closes #14048
This commit is contained in:
Richard Yao
GitHub
parent
27218a32fc
commit
d10bd7d288
@ -29,11 +29,20 @@
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#define NULL (0)
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typedef enum {
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B_FALSE = 0,
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B_TRUE = 1
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} boolean_t;
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typedef unsigned int uint_t;
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int condition0, condition1;
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int
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ddi_copyin(const void *from, void *to, size_t len, int flags)
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{
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(void) flags;
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__coverity_negative_sink__(len);
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__coverity_tainted_data_argument__(from);
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__coverity_tainted_data_argument__(to);
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__coverity_writeall__(to);
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@ -42,13 +51,21 @@ ddi_copyin(const void *from, void *to, size_t len, int flags)
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void *
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memset(void *dst, int c, size_t len)
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{
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__coverity_writeall__(dst);
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__coverity_negative_sink__(len);
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if (c == 0)
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__coverity_writeall0__(dst);
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else
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__coverity_writeall__(dst);
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return (dst);
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}
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void *
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memmove(void *dst, void *src, size_t len)
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{
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int first = ((char *)src)[0];
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int last = ((char *)src)[len-1];
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__coverity_negative_sink__(len);
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__coverity_writeall__(dst);
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return (dst);
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}
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@ -56,6 +73,10 @@ memmove(void *dst, void *src, size_t len)
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void *
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memcpy(void *dst, void *src, size_t len)
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{
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int first = ((char *)src)[0];
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int last = ((char *)src)[len-1];
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__coverity_negative_sink__(len);
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__coverity_writeall__(dst);
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return (dst);
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}
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@ -63,43 +84,53 @@ memcpy(void *dst, void *src, size_t len)
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void *
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umem_alloc_aligned(size_t size, size_t align, int kmflags)
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{
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(void) align;
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__coverity_negative_sink__(size);
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__coverity_negative_sink__(align);
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if ((UMEM_NOFAIL & kmflags) == UMEM_NOFAIL)
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return (__coverity_alloc__(size));
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else if (condition0)
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return (__coverity_alloc__(size));
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else
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return (NULL);
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if (((UMEM_NOFAIL & kmflags) == UMEM_NOFAIL) || condition0) {
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void *buf = __coverity_alloc__(size);
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__coverity_mark_as_uninitialized_buffer__(buf);
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__coverity_mark_as_afm_allocated__(buf, "umem_free");
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return (buf);
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}
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return (NULL);
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}
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void *
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umem_alloc(size_t size, int kmflags)
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{
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if ((UMEM_NOFAIL & kmflags) == UMEM_NOFAIL)
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return (__coverity_alloc__(size));
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else if (condition0)
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return (__coverity_alloc__(size));
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else
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return (NULL);
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__coverity_negative_sink__(size);
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if (((UMEM_NOFAIL & kmflags) == UMEM_NOFAIL) || condition0) {
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void *buf = __coverity_alloc__(size);
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__coverity_mark_as_uninitialized_buffer__(buf);
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__coverity_mark_as_afm_allocated__(buf, "umem_free");
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return (buf);
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}
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return (NULL);
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}
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void *
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umem_zalloc(size_t size, int kmflags)
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{
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if ((UMEM_NOFAIL & kmflags) == UMEM_NOFAIL)
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return (__coverity_alloc__(size));
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else if (condition0)
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return (__coverity_alloc__(size));
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else
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return (NULL);
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__coverity_negative_sink__(size);
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if (((UMEM_NOFAIL & kmflags) == UMEM_NOFAIL) || condition0) {
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void *buf = __coverity_alloc__(size);
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__coverity_writeall0__(buf);
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__coverity_mark_as_afm_allocated__(buf, "umem_free");
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return (buf);
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}
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return (NULL);
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}
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void
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umem_free(void *buf, size_t size)
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{
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(void) size;
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__coverity_negative_sink__(size);
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__coverity_free__(buf);
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}
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@ -113,12 +144,14 @@ umem_cache_alloc(umem_cache_t *skc, int flags)
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if (condition1)
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__coverity_sleep__();
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if ((UMEM_NOFAIL & flags) == UMEM_NOFAIL)
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return (__coverity_alloc_nosize__());
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else if (condition0)
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return (__coverity_alloc_nosize__());
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else
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return (NULL);
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if (((UMEM_NOFAIL & flags) == UMEM_NOFAIL) || condition0) {
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void *buf = __coverity_alloc_nosize__();
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__coverity_mark_as_uninitialized_buffer__(buf);
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__coverity_mark_as_afm_allocated__(buf, "umem_cache_free");
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return (buf);
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}
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return (NULL);
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}
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void
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@ -135,15 +168,19 @@ spl_kmem_alloc(size_t sz, int fl, const char *func, int line)
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(void) func;
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(void) line;
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__coverity_negative_sink__(sz);
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if (condition1)
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__coverity_sleep__();
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if (fl == 0) {
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return (__coverity_alloc__(sz));
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} else if (condition0)
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return (__coverity_alloc__(sz));
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else
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return (NULL);
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if ((fl == 0) || condition0) {
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void *buf = __coverity_alloc__(sz);
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__coverity_mark_as_uninitialized_buffer__(buf);
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__coverity_mark_as_afm_allocated__(buf, "spl_kmem_free");
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return (buf);
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}
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return (NULL);
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}
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void *
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@ -152,22 +189,126 @@ spl_kmem_zalloc(size_t sz, int fl, const char *func, int line)
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(void) func;
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(void) line;
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__coverity_negative_sink__(sz);
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if (condition1)
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__coverity_sleep__();
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if (fl == 0) {
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return (__coverity_alloc__(sz));
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} else if (condition0)
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return (__coverity_alloc__(sz));
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else
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return (NULL);
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if ((fl == 0) || condition0) {
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void *buf = __coverity_alloc__(sz);
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__coverity_writeall0__(buf);
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__coverity_mark_as_afm_allocated__(buf, "spl_kmem_free");
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return (buf);
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}
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return (NULL);
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}
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void
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spl_kmem_free(const void *ptr, size_t sz)
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{
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(void) sz;
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__coverity_negative_sink__(sz);
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__coverity_free__(ptr);
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}
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char *
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kmem_vasprintf(const char *fmt, va_list ap)
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{
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char *buf = __coverity_alloc_nosize__();
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(void) ap;
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__coverity_string_null_sink__(fmt);
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__coverity_string_size_sink__(fmt);
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__coverity_writeall__(buf);
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__coverity_mark_as_afm_allocated__(buf, "kmem_strfree");
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return (buf);
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}
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char *
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kmem_asprintf(const char *fmt, ...)
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{
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char *buf = __coverity_alloc_nosize__();
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__coverity_string_null_sink__(fmt);
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__coverity_string_size_sink__(fmt);
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__coverity_writeall__(buf);
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__coverity_mark_as_afm_allocated__(buf, "kmem_strfree");
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return (buf);
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}
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char *
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kmem_strdup(const char *str)
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{
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char *buf = __coverity_alloc_nosize__();
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__coverity_string_null_sink__(str);
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__coverity_string_size_sink__(str);
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__coverity_writeall__(buf);
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__coverity_mark_as_afm_allocated__(buf, "kmem_strfree");
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return (buf);
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}
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void
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kmem_strfree(char *str)
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{
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__coverity_free__(str);
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}
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void *
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spl_vmem_alloc(size_t sz, int fl, const char *func, int line)
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{
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(void) func;
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(void) line;
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__coverity_negative_sink__(sz);
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if (condition1)
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__coverity_sleep__();
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if ((fl == 0) || condition0) {
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void *buf = __coverity_alloc__(sz);
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__coverity_mark_as_uninitialized_buffer__(buf);
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__coverity_mark_as_afm_allocated__(buf, "spl_vmem_free");
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return (buf);
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}
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return (NULL);
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}
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void *
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spl_vmem_zalloc(size_t sz, int fl, const char *func, int line)
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{
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(void) func;
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(void) line;
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if (condition1)
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__coverity_sleep__();
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if ((fl == 0) || condition0) {
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void *buf = __coverity_alloc__(sz);
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__coverity_writeall0__(buf);
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__coverity_mark_as_afm_allocated__(buf, "spl_vmem_free");
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return (buf);
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}
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return (NULL);
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}
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void
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spl_vmem_free(const void *ptr, size_t sz)
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{
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__coverity_negative_sink__(sz);
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__coverity_free__(ptr);
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}
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@ -181,12 +322,12 @@ spl_kmem_cache_alloc(spl_kmem_cache_t *skc, int flags)
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if (condition1)
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__coverity_sleep__();
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if (flags == 0) {
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return (__coverity_alloc_nosize__());
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} else if (condition0)
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return (__coverity_alloc_nosize__());
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else
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return (NULL);
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if ((flags == 0) || condition0) {
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void *buf = __coverity_alloc_nosize__();
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__coverity_mark_as_uninitialized_buffer__(buf);
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__coverity_mark_as_afm_allocated__(buf, "spl_kmem_cache_free");
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return (buf);
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}
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}
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void
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@ -197,12 +338,164 @@ spl_kmem_cache_free(spl_kmem_cache_t *skc, void *obj)
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__coverity_free__(obj);
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}
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void
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malloc(size_t size)
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typedef struct {} zfsvfs_t;
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int
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zfsvfs_create(const char *osname, boolean_t readonly, zfsvfs_t **zfvp)
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{
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__coverity_alloc__(size);
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(void) osname;
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(void) readonly;
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if (condition1)
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__coverity_sleep__();
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if (condition0) {
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*zfvp = __coverity_alloc_nosize__();
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__coverity_writeall__(*zfvp);
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return (0);
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}
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return (1);
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}
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void
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zfsvfs_free(zfsvfs_t *zfsvfs)
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{
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__coverity_free__(zfsvfs);
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}
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typedef struct {} nvlist_t;
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int
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nvlist_alloc(nvlist_t **nvlp, uint_t nvflag, int kmflag)
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{
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(void) nvflag;
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if (condition1)
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__coverity_sleep__();
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if ((kmflag == 0) || condition0) {
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*nvlp = __coverity_alloc_nosize__();
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__coverity_mark_as_afm_allocated__(*nvlp, "nvlist_free");
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__coverity_writeall__(*nvlp);
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return (0);
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}
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return (-1);
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}
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int
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nvlist_dup(const nvlist_t *nvl, nvlist_t **nvlp, int kmflag)
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{
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nvlist_t read = *nvl;
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if (condition1)
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__coverity_sleep__();
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if ((kmflag == 0) || condition0) {
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nvlist_t *nvl = __coverity_alloc_nosize__();
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__coverity_mark_as_afm_allocated__(nvl, "nvlist_free");
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__coverity_writeall__(nvl);
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*nvlp = nvl;
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return (0);
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}
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return (-1);
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}
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void
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nvlist_free(nvlist_t *nvl)
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{
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__coverity_free__(nvl);
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}
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int
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nvlist_pack(nvlist_t *nvl, char **bufp, size_t *buflen, int encoding,
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int kmflag)
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{
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(void) nvl;
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(void) encoding;
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if (*bufp == NULL) {
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if (condition1)
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__coverity_sleep__();
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if ((kmflag == 0) || condition0) {
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char *buf = __coverity_alloc_nosize__();
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__coverity_writeall__(buf);
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/*
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* We cannot use __coverity_mark_as_afm_allocated__()
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* because the free function varies between the kernel
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* and userspace.
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*/
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*bufp = buf;
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return (0);
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}
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return (-1);
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}
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/*
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* Unfortunately, errors from the buffer being too small are not
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* possible to model, so we assume success.
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*/
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__coverity_negative_sink__(*buflen);
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__coverity_writeall__(*bufp);
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return (0);
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}
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int
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nvlist_unpack(char *buf, size_t buflen, nvlist_t **nvlp, int kmflag)
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{
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__coverity_negative_sink__(buflen);
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if (condition1)
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__coverity_sleep__();
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if ((kmflag == 0) || condition0) {
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nvlist_t *nvl = __coverity_alloc_nosize__();
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__coverity_mark_as_afm_allocated__(nvl, "nvlist_free");
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__coverity_writeall__(nvl);
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*nvlp = nvl;
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int first = buf[0];
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int last = buf[buflen-1];
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return (0);
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}
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return (-1);
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}
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void *
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malloc(size_t size)
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{
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void *buf = __coverity_alloc__(size);
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if (condition1)
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__coverity_sleep__();
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__coverity_negative_sink__(size);
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__coverity_mark_as_uninitialized_buffer__(buf);
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__coverity_mark_as_afm_allocated__(buf, "free");
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return (buf);
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}
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void *
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calloc(size_t nmemb, size_t size)
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{
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void *buf = __coverity_alloc__(size * nmemb);
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if (condition1)
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__coverity_sleep__();
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__coverity_negative_sink__(size);
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__coverity_writeall0__(buf);
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__coverity_mark_as_afm_allocated__(buf, "free");
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return (buf);
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}
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void
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free(void *buf)
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{
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