Reduce false positives from Static Analyzers
Both Clang's Static Analyzer and Synopsys' Coverity would ignore assertions. Following Clang's advice, we annotate our assertions: https://clang-analyzer.llvm.org/annotations.html#custom_assertions This makes both Clang's Static Analyzer and Coverity properly identify assertions. This change reduced Clang's reported defects from 246 to 180. It also reduced the false positives reported by Coverityi by 10, while enabling Coverity to find 9 more defects that previously were false negatives. A couple examples of this would be CID-1524417 and CID-1524423. After submitting a build to coverity with the modified assertions, CID-1524417 disappeared while the report for CID-1524423 no longer claimed that the assertion tripped. Coincidentally, it turns out that it is possible to more accurately annotate our headers than the Coverity modelling file permits in the case of format strings. Since we can do that and this patch annotates headers whenever `__coverity_panic__()` would have been used in the model file, we drop all models that use `__coverity_panic__()` from the model file. Upon seeing the success in eliminating false positives involving assertions, it occurred to me that we could also modify our headers to eliminate coverity's false positives involving byte swaps. We now have coverity specific byteswap macros, that do nothing, to disable Coverity's false positives when we do byte swaps. This allowed us to also drop the byteswap definitions from the model file. Lastly, a model file update has been done beyond the mentioned deletions: * The definitions of `umem_alloc_aligned()`, `umem_alloc()` andi `umem_zalloc()` were originally implemented in a way that was intended to inform coverity that when KM_SLEEP has been passed these functions, they do not return NULL. A small error in how this was done was found, so we correct it. * Definitions for umem_cache_alloc() and umem_cache_free() have been added. In practice, no false positives were avoided by making these changes, but in the interest of correctness from future coverity builds, we make them anyway. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Ryan Moeller <ryan@iXsystems.com> Signed-off-by: Richard Yao <richard.yao@alumni.stonybrook.edu> Closes #13902
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@ -39,6 +39,7 @@ void zed_log_syslog_close(void);
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void zed_log_msg(int priority, const char *fmt, ...);
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__attribute__((format(printf, 1, 2), __noreturn__))
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void zed_log_die(const char *fmt, ...);
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#endif /* !ZED_LOG_H */
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@ -31,66 +31,6 @@
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int condition0, condition1;
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void
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abort()
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{
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__coverity_panic__();
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}
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void
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exit(int status)
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{
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(void) status;
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__coverity_panic__();
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}
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void
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_exit(int status)
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{
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(void) status;
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__coverity_panic__();
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}
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void
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zed_log_die(const char *fmt, ...)
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{
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__coverity_format_string_sink__(fmt);
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__coverity_panic__();
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}
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void
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panic(const char *fmt, ...)
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{
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__coverity_format_string_sink__(fmt);
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__coverity_panic__();
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}
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void
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vpanic(const char *fmt, va_list adx)
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{
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(void) adx;
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__coverity_format_string_sink__(fmt);
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__coverity_panic__();
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}
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void
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uu_panic(const char *format, ...)
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{
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__coverity_format_string_sink__(format);
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__coverity_panic__();
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}
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int
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libspl_assertf(const char *file, const char *func, int line,
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const char *format, ...)
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{
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__coverity_format_string_sink__(format);
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__coverity_panic__();
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}
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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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@ -125,7 +65,7 @@ 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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if (UMEM_NOFAIL & kmflags == UMEM_NOFAIL)
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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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@ -136,7 +76,7 @@ umem_alloc_aligned(size_t size, size_t align, int kmflags)
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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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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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@ -147,7 +87,7 @@ umem_alloc(size_t size, int kmflags)
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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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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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@ -163,6 +103,32 @@ umem_free(void *buf, size_t size)
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__coverity_free__(buf);
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}
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typedef struct {} umem_cache_t;
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void *
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umem_cache_alloc(umem_cache_t *skc, int flags)
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{
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(void) skc;
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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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}
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void
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umem_cache_free(umem_cache_t *skc, void *obj)
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{
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(void) skc;
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__coverity_free__(obj);
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}
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void *
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spl_kmem_alloc(size_t sz, int fl, const char *func, int line)
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{
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@ -243,13 +209,6 @@ free(void *buf)
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__coverity_free__(buf);
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}
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int
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spl_panic(const char *file, const char *func, int line, const char *fmt, ...)
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{
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__coverity_format_string_sink__(fmt);
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__coverity_panic__();
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}
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int
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sched_yield(void)
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{
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@ -398,25 +357,3 @@ __cond_resched(void)
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__coverity_sleep__();
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}
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}
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/*
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* An endian-independent filesystem must support doing byte swaps on data. We
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* attempt to suppress taint warnings, which are false positives for us.
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*/
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void
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byteswap_uint64_array(void *vbuf, size_t size)
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{
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__coverity_tainted_data_sanitize__(vbuf);
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}
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void
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byteswap_uint32_array(void *vbuf, size_t size)
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{
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__coverity_tainted_data_sanitize__(vbuf);
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}
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void
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byteswap_uint16_array(void *vbuf, size_t size)
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{
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__coverity_tainted_data_sanitize__(vbuf);
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}
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@ -42,7 +42,8 @@ extern "C" {
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void uu_set_error(uint_t);
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void uu_panic(const char *format, ...) __attribute__((format(printf, 1, 2)));
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__attribute__((format(printf, 1, 2), __noreturn__))
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void uu_panic(const char *format, ...);
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/*
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@ -44,6 +44,18 @@
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#include <sys/endian.h>
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#ifdef __COVERITY__
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/*
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* Coverity's taint warnings from byteswapping are false positives for us.
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* Suppress them by hiding byteswapping from Coverity.
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*/
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#define BSWAP_8(x) ((x) & 0xff)
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#define BSWAP_16(x) ((x) & 0xffff)
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#define BSWAP_32(x) ((x) & 0xffffffff)
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#define BSWAP_64(x) (x)
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#else /* __COVERITY__ */
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/*
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* Macros to reverse byte order
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*/
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@ -52,6 +64,8 @@
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#define BSWAP_32(x) ((BSWAP_16(x) << 16) | BSWAP_16((x) >> 16))
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#define BSWAP_64(x) ((BSWAP_32(x) << 32) | BSWAP_32((x) >> 32))
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#endif /* __COVERITY__ */
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#define BMASK_8(x) ((x) & 0xff)
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#define BMASK_16(x) ((x) & 0xffff)
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#define BMASK_32(x) ((x) & 0xffffffff)
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@ -71,7 +71,7 @@ extern void vuprintf(const char *, __va_list)
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__attribute__((format(printf, 1, 0)));
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extern void panic(const char *, ...)
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__attribute__((format(printf, 1, 2)));
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__attribute__((format(printf, 1, 2), __noreturn__));
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#endif /* !_ASM */
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@ -54,9 +54,16 @@
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/*
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* Common DEBUG functionality.
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*/
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int spl_panic(const char *file, const char *func, int line,
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const char *fmt, ...);
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void spl_dumpstack(void);
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extern void spl_panic(const char *file, const char *func, int line,
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const char *fmt, ...) __attribute__((__noreturn__));
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extern void spl_dumpstack(void);
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static inline int
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spl_assert(const char *buf, const char *file, const char *func, int line)
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{
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spl_panic(file, func, line, "%s", buf);
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return (0);
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}
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#ifndef expect
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#define expect(expr, value) (__builtin_expect((expr), (value)))
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@ -69,8 +76,8 @@ void spl_dumpstack(void);
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#define VERIFY(cond) \
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(void) (unlikely(!(cond)) && \
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spl_panic(__FILE__, __FUNCTION__, __LINE__, \
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"%s", "VERIFY(" #cond ") failed\n"))
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spl_assert("VERIFY(" #cond ") failed\n", \
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__FILE__, __FUNCTION__, __LINE__))
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#define VERIFY3B(LEFT, OP, RIGHT) do { \
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const boolean_t _verify3_left = (boolean_t)(LEFT); \
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@ -158,13 +165,14 @@ void spl_dumpstack(void);
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#define ASSERT0 VERIFY0
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#define ASSERT VERIFY
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#define IMPLY(A, B) \
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((void)(likely((!(A)) || (B)) || \
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spl_panic(__FILE__, __FUNCTION__, __LINE__, \
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"(" #A ") implies (" #B ")")))
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((void)(likely((!(A)) || (B)) || \
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spl_assert("(" #A ") implies (" #B ")", \
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__FILE__, __FUNCTION__, __LINE__)))
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#define EQUIV(A, B) \
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((void)(likely(!!(A) == !!(B)) || \
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spl_panic(__FILE__, __FUNCTION__, __LINE__, \
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"(" #A ") is equivalent to (" #B ")")))
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((void)(likely(!!(A) == !!(B)) || \
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spl_assert("(" #A ") is equivalent to (" #B ")", \
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__FILE__, __FUNCTION__, __LINE__)))
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#endif /* NDEBUG */
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@ -52,8 +52,10 @@ MALLOC_DECLARE(M_SOLARIS);
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typedef struct vmem vmem_t;
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extern char *kmem_asprintf(const char *, ...);
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extern char *kmem_vasprintf(const char *fmt, va_list ap);
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extern char *kmem_asprintf(const char *, ...)
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__attribute__((format(printf, 1, 2)));
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extern char *kmem_vasprintf(const char *fmt, va_list ap)
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__attribute__((format(printf, 1, 0)));
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typedef struct kmem_cache {
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char kc_name[32];
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@ -70,6 +72,7 @@ typedef struct kmem_cache {
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extern uint64_t spl_kmem_cache_inuse(kmem_cache_t *cache);
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extern uint64_t spl_kmem_cache_entry_size(kmem_cache_t *cache);
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__attribute__((alloc_size(1)))
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void *zfs_kmem_alloc(size_t size, int kmflags);
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void zfs_kmem_free(void *buf, size_t size);
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uint64_t kmem_size(void);
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#include <sys/isa_defs.h>
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#ifdef __COVERITY__
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/*
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* Coverity's taint warnings from byteswapping are false positives for us.
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* Suppress them by hiding byteswapping from Coverity.
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*/
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#define BSWAP_8(x) ((x) & 0xff)
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#define BSWAP_16(x) ((x) & 0xffff)
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#define BSWAP_32(x) ((x) & 0xffffffff)
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#define BSWAP_64(x) (x)
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#else /* __COVERITY__ */
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#define BSWAP_8(x) ((x) & 0xff)
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#define BSWAP_16(x) ((BSWAP_8(x) << 8) | BSWAP_8((x) >> 8))
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#define BSWAP_32(x) ((BSWAP_16(x) << 16) | BSWAP_16((x) >> 16))
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#define BSWAP_64(x) ((BSWAP_32(x) << 32) | BSWAP_32((x) >> 32))
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#endif /* __COVERITY__ */
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#define LE_16(x) cpu_to_le16(x)
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#define LE_32(x) cpu_to_le32(x)
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#define LE_64(x) cpu_to_le64(x)
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@ -41,7 +41,7 @@ extern void cmn_err(int, const char *, ...)
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extern void vcmn_err(int, const char *, va_list)
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__attribute__((format(printf, 2, 0)));
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extern void vpanic(const char *, va_list)
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__attribute__((format(printf, 1, 0)));
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__attribute__((format(printf, 1, 0), __noreturn__));
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#define fm_panic panic
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@ -54,17 +54,24 @@
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#define __maybe_unused __attribute__((unused))
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#endif
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int spl_panic(const char *file, const char *func, int line,
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const char *fmt, ...);
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void spl_dumpstack(void);
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extern void spl_panic(const char *file, const char *func, int line,
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const char *fmt, ...) __attribute__((__noreturn__));
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extern void spl_dumpstack(void);
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static inline int
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spl_assert(const char *buf, const char *file, const char *func, int line)
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{
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spl_panic(file, func, line, "%s", buf);
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return (0);
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}
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#define PANIC(fmt, a...) \
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spl_panic(__FILE__, __FUNCTION__, __LINE__, fmt, ## a)
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#define VERIFY(cond) \
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(void) (unlikely(!(cond)) && \
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spl_panic(__FILE__, __FUNCTION__, __LINE__, \
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"%s", "VERIFY(" #cond ") failed\n"))
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spl_assert("VERIFY(" #cond ") failed\n", \
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__FILE__, __FUNCTION__, __LINE__))
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#define VERIFY3B(LEFT, OP, RIGHT) do { \
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const boolean_t _verify3_left = (boolean_t)(LEFT); \
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@ -152,13 +159,13 @@ void spl_dumpstack(void);
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#define ASSERT0 VERIFY0
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#define ASSERT VERIFY
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#define IMPLY(A, B) \
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((void)(likely((!(A)) || (B)) || \
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spl_panic(__FILE__, __FUNCTION__, __LINE__, \
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"(" #A ") implies (" #B ")")))
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((void)(likely((!(A)) || (B)) || \
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spl_assert("(" #A ") implies (" #B ")", \
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__FILE__, __FUNCTION__, __LINE__)))
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#define EQUIV(A, B) \
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((void)(likely(!!(A) == !!(B)) || \
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spl_panic(__FILE__, __FUNCTION__, __LINE__, \
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"(" #A ") is equivalent to (" #B ")")))
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((void)(likely(!!(A) == !!(B)) || \
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spl_assert("(" #A ") is equivalent to (" #B ")", \
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__FILE__, __FUNCTION__, __LINE__)))
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#endif /* NDEBUG */
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@ -31,8 +31,10 @@
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#include <linux/vmalloc.h>
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extern int kmem_debugging(void);
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extern char *kmem_vasprintf(const char *fmt, va_list ap);
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extern char *kmem_asprintf(const char *fmt, ...);
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extern char *kmem_vasprintf(const char *fmt, va_list ap)
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__attribute__((format(printf, 1, 0)));
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extern char *kmem_asprintf(const char *fmt, ...)
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__attribute__((format(printf, 1, 2)));
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extern char *kmem_strdup(const char *str);
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extern void kmem_strfree(char *str);
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@ -179,8 +181,10 @@ extern unsigned int spl_kmem_alloc_max;
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#define kmem_free(ptr, sz) spl_kmem_free((ptr), (sz))
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#define kmem_cache_reap_active spl_kmem_cache_reap_active
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extern void *spl_kmem_alloc(size_t sz, int fl, const char *func, int line);
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extern void *spl_kmem_zalloc(size_t sz, int fl, const char *func, int line);
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extern void *spl_kmem_alloc(size_t sz, int fl, const char *func, int line)
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__attribute__((alloc_size(1)));
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extern void *spl_kmem_zalloc(size_t sz, int fl, const char *func, int line)
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__attribute__((alloc_size(1)));
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extern void spl_kmem_free(const void *ptr, size_t sz);
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/*
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|
@ -151,10 +151,14 @@ extern "C" {
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extern void dprintf_setup(int *argc, char **argv);
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extern void cmn_err(int, const char *, ...);
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extern void vcmn_err(int, const char *, va_list);
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extern __attribute__((noreturn)) void panic(const char *, ...);
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extern __attribute__((noreturn)) void vpanic(const char *, va_list);
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extern void cmn_err(int, const char *, ...)
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__attribute__((format(printf, 2, 3)));
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extern void vcmn_err(int, const char *, va_list)
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__attribute__((format(printf, 2, 0)));
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extern void panic(const char *, ...)
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__attribute__((format(printf, 1, 2), noreturn));
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extern void vpanic(const char *, va_list)
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__attribute__((format(printf, 1, 0), noreturn));
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#define fm_panic panic
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|
@ -45,8 +45,11 @@ libspl_assertf(const char *file, const char *func, int line,
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fprintf(stderr, "\n");
|
||||
fprintf(stderr, "ASSERT at %s:%d:%s()", file, line, func);
|
||||
va_end(args);
|
||||
|
||||
#if !__has_feature(attribute_analyzer_noreturn) && !defined(__COVERITY__)
|
||||
if (libspl_assert_ok) {
|
||||
return;
|
||||
}
|
||||
#endif
|
||||
abort();
|
||||
}
|
||||
|
@ -34,12 +34,24 @@
|
||||
#include <stdarg.h>
|
||||
#include <sys/types.h>
|
||||
|
||||
/* Workaround for non-Clang compilers */
|
||||
#ifndef __has_feature
|
||||
#define __has_feature(x) 0
|
||||
#endif
|
||||
|
||||
/* We need to workaround libspl_set_assert_ok() that we have for zdb */
|
||||
#if __has_feature(attribute_analyzer_noreturn) || defined(__COVERITY__)
|
||||
#define NORETURN __attribute__((__noreturn__))
|
||||
#else
|
||||
#define NORETURN
|
||||
#endif
|
||||
|
||||
/* Set to non-zero to avoid abort()ing on an assertion failure */
|
||||
extern void libspl_set_assert_ok(boolean_t val);
|
||||
|
||||
/* printf version of libspl_assert */
|
||||
extern void libspl_assertf(const char *file, const char *func, int line,
|
||||
const char *format, ...);
|
||||
const char *format, ...) NORETURN __attribute__((format(printf, 4, 5)));
|
||||
|
||||
static inline int
|
||||
libspl_assert(const char *buf, const char *file, const char *func, int line)
|
||||
|
@ -59,6 +59,18 @@ extern "C" {
|
||||
*/
|
||||
#if !defined(_XPG4_2) || defined(__EXTENSIONS__)
|
||||
|
||||
#ifdef __COVERITY__
|
||||
/*
|
||||
* Coverity's taint warnings from byteswapping are false positives for us.
|
||||
* Suppress them by hiding byteswapping from Coverity.
|
||||
*/
|
||||
#define BSWAP_8(x) ((x) & 0xff)
|
||||
#define BSWAP_16(x) ((x) & 0xffff)
|
||||
#define BSWAP_32(x) ((x) & 0xffffffff)
|
||||
#define BSWAP_64(x) (x)
|
||||
|
||||
#else /* __COVERITY__ */
|
||||
|
||||
/*
|
||||
* Macros to reverse byte order
|
||||
*/
|
||||
@ -67,6 +79,8 @@ extern "C" {
|
||||
#define BSWAP_32(x) ((BSWAP_16(x) << 16) | BSWAP_16((x) >> 16))
|
||||
#define BSWAP_64(x) ((BSWAP_32(x) << 32) | BSWAP_32((x) >> 32))
|
||||
|
||||
#endif /* __COVERITY__ */
|
||||
|
||||
#define BMASK_8(x) ((x) & 0xff)
|
||||
#define BMASK_16(x) ((x) & 0xffff)
|
||||
#define BMASK_32(x) ((x) & 0xffffffff)
|
||||
|
@ -90,6 +90,18 @@ extern in_port_t ntohs(in_port_t);
|
||||
|
||||
#if !defined(_XPG4_2) || defined(__EXTENSIONS__)
|
||||
|
||||
#ifdef __COVERITY__
|
||||
/*
|
||||
* Coverity's taint warnings from byteswapping are false positives for us.
|
||||
* Suppress them by hiding byteswapping from Coverity.
|
||||
*/
|
||||
#define BSWAP_8(x) ((x) & 0xff)
|
||||
#define BSWAP_16(x) ((x) & 0xffff)
|
||||
#define BSWAP_32(x) ((x) & 0xffffffff)
|
||||
#define BSWAP_64(x) (x)
|
||||
|
||||
#else /* __COVERITY__ */
|
||||
|
||||
/*
|
||||
* Macros to reverse byte order
|
||||
*/
|
||||
@ -98,6 +110,8 @@ extern in_port_t ntohs(in_port_t);
|
||||
#define BSWAP_32(x) ((BSWAP_16(x) << 16) | BSWAP_16((x) >> 16))
|
||||
#define BSWAP_64(x) ((BSWAP_32(x) << 32) | BSWAP_32((x) >> 32))
|
||||
|
||||
#endif /* __COVERITY__ */
|
||||
|
||||
#define BMASK_8(x) ((x) & 0xff)
|
||||
#define BMASK_16(x) ((x) & 0xffff)
|
||||
#define BMASK_32(x) ((x) & 0xffffffff)
|
||||
|
@ -83,6 +83,7 @@ const char *_umem_debug_init(void);
|
||||
const char *_umem_options_init(void);
|
||||
const char *_umem_logging_init(void);
|
||||
|
||||
__attribute__((alloc_size(1)))
|
||||
static inline void *
|
||||
umem_alloc(size_t size, int flags)
|
||||
{
|
||||
@ -95,6 +96,7 @@ umem_alloc(size_t size, int flags)
|
||||
return (ptr);
|
||||
}
|
||||
|
||||
__attribute__((alloc_size(1)))
|
||||
static inline void *
|
||||
umem_alloc_aligned(size_t size, size_t align, int flags)
|
||||
{
|
||||
@ -116,6 +118,7 @@ umem_alloc_aligned(size_t size, size_t align, int flags)
|
||||
return (ptr);
|
||||
}
|
||||
|
||||
__attribute__((alloc_size(1)))
|
||||
static inline void *
|
||||
umem_zalloc(size_t size, int flags)
|
||||
{
|
||||
|
@ -94,7 +94,7 @@ ddi_copyout(const void *from, void *to, size_t len, int flags)
|
||||
return (copyout(from, to, len));
|
||||
}
|
||||
|
||||
int
|
||||
void
|
||||
spl_panic(const char *file, const char *func, int line, const char *fmt, ...)
|
||||
{
|
||||
va_list ap;
|
||||
|
@ -45,7 +45,7 @@ spl_dumpstack(void)
|
||||
}
|
||||
EXPORT_SYMBOL(spl_dumpstack);
|
||||
|
||||
int
|
||||
void
|
||||
spl_panic(const char *file, const char *func, int line, const char *fmt, ...)
|
||||
{
|
||||
const char *newfile;
|
||||
@ -75,7 +75,6 @@ spl_panic(const char *file, const char *func, int line, const char *fmt, ...)
|
||||
schedule();
|
||||
|
||||
/* Unreachable */
|
||||
return (1);
|
||||
}
|
||||
EXPORT_SYMBOL(spl_panic);
|
||||
|
||||
|
Loading…
Reference in New Issue
Block a user