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The Coverity Scan service has detected potential race condition in ceph_ioctl_lazyio() [1]. The CID 1591046 contains explanation: "Check of thread-shared field evades lock acquisition (LOCK_EVASION). Thread1 sets fmode to a new value. Now the two threads have an inconsistent view of fmode and updates to fields correlated with fmode may be lost. The data guarded by this critical section may be read while in an inconsistent state or modified by multiple racing threads. In ceph_ioctl_lazyio: Checking the value of a thread-shared field outside of a locked region to determine if a locked operation involving that thread shared field has completed. (CWE-543)". The patch places fi->fmode field access under ci->i_ceph_lock protection. Also, it introduces the is_file_already_lazy variable that is set under the lock and it is checked later out of scope of critical section. [1] https://scan5.scan.coverity.com/#/project-view/64304/10063?selectedIssue=1591046 Signed-off-by: Viacheslav Dubeyko <Slava.Dubeyko@ibm.com> Reviewed-by: Alex Markuze <amarkuze@redhat.com> Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.