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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
46 lines
1.2 KiB
C
46 lines
1.2 KiB
C
/*
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* This file is part of the ZFS Event Daemon (ZED).
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*
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* Developed at Lawrence Livermore National Laboratory (LLNL-CODE-403049).
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* Copyright (C) 2013-2014 Lawrence Livermore National Security, LLC.
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* Refer to the OpenZFS git commit log for authoritative copyright attribution.
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License Version 1.0 (CDDL-1.0).
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* You can obtain a copy of the license from the top-level file
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* "OPENSOLARIS.LICENSE" or at <http://opensource.org/licenses/CDDL-1.0>.
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* You may not use this file except in compliance with the license.
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*/
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#ifndef ZED_LOG_H
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#define ZED_LOG_H
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#include <syslog.h>
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void zed_log_init(const char *identity);
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void zed_log_fini(void);
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void zed_log_pipe_open(void);
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void zed_log_pipe_close_reads(void);
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void zed_log_pipe_close_writes(void);
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void zed_log_pipe_wait(void);
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void zed_log_stderr_open(int priority);
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void zed_log_stderr_close(void);
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void zed_log_syslog_open(int facility);
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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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