In 2019, 11% of all vulnerabilities listed by the National Vulnerability Database were linked to PHP;[284] historically, about 30% of all vulnerabilities listed since 1996 in this database are linked to PHP. Technical security flaws of the language itself or of its core libraries are not frequent (22 in 2009, about 1% of the total although PHP applies to about 20% of programs listed).[285] Recognizing that programmers make mistakes, some languages include taint checking to automatically detect the lack of input validation which induces many issues. Such a feature is being developed for PHP,[286] but its inclusion into a release has been rejected several times in the past.[287][288]
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Legacy YUM v3 plug-ins are incompatible with the new version of YUM v4. Selected yum plug-ins and utilities have been ported to the new DNF back end, and can be installed under the same names as in RHEL 7. They also provide compatibility symlinks, so the binaries, configuration files and directories can be found in usual locations.
Similarly to iptables, nftables use tables for storing chains. The chains contain individual rules for performing actions. The nft tool replaces all tools from the previous packet-filtering frameworks. The libnftables library can be used for low-level interaction with nftables Netlink API over the libmnl library.
A new TCP congestion control algorithm, Bottleneck Bandwidth and Round-trip time (BBR) is now supported in Red Hat Enterprise Linux (RHEL) 8. BBR attempts to determine the bandwidth of the bottleneck link and the Round-trip time (RTT). Most congestion algorithms are based on packet loss, including CUBIC, the default Linux TCP congestion control algorithm, which have problems on high-throughput links. BBR does not react to loss events directly, it adjusts the TCP pacing rate to match it with the available bandwidth.
The -ok option of the tc command has been removed in Red Hat Enterprise Linux 8. As a workaround, users can implement code to communicate directly via netlink with the kernel. Response messages received, indicate completion and status of sent requests. An alternative way for less time-critical applications is to call tc for each command separately. This may happen with a custom script which simulates the tc -batch behavior by printing OK for each successful tc invocation.
The XFS file system supports shared copy-on-write data extent functionality. This feature enables two or more files to share a common set of data blocks. When either of the files sharing common blocks changes, XFS breaks the link to common blocks and creates a new file. This is similar to the copy-on-write (COW) functionality found in other file systems.
The Application Binary Interface (ABI) of the std::string and std::list classes from the libstdc++ library changed between RHEL 7 (GCC 4.8) and RHEL 8 (GCC 8) to conform to the C++11 standard. The libstdc++ library supports both the old and new ABI, but some other C++ system libraries do not. As a consequence, applications that dynamically link against these libraries will need to be rebuilt. This affects all C++ standard modes, including C++98. It also affects applications built with Red Hat Developer Toolset compilers for RHEL 7, which kept the old ABI to maintain compatibility with the system libraries.
Previously, the valgrind-devel sub-package used to include development files for developing custom valgrind tools. This update removes these files because they do not have a guaranteed API, have to be linked statically, and are unsupported. The valgrind-devel package still does contain the development files for valgrind-aware programs and header files such as valgrind.h, callgrind.h, drd.h, helgrind.h, and memcheck.h, which are stable and well-supported.
Many of the rules are designed to be supported by an analysis tool.Violations of rules will be flagged with references (or links) to the relevant rule.We do not expect you to memorize all the rules before trying to write code.One way of thinking about these guidelines is as a specification for tools that happens to be readable by humans.
These rules are not meant to be read serially, like a book.You can browse through them using the links.However, their main intended use is to be targets for tools.That is, a tool looks for violations and the tool returns links to violated rules.The rules then provide reasons, examples of potential consequences of the violation, and suggested remedies.
The result of pb2->id() == "D" is actually implementation defined.We added it to warn of the dangers of home-brew RTTI.This code might work as expected for years, just to fail on a new machine, new compiler, or a new linker that does not unify character literals.
Just ignore the error and try running the project anyway. It will fail, but this time you will get a link in the error description. Clicking the link will trigger the automatic update/download of the outdated/missing component. 2ff7e9595c
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