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4941a17751
- Do not allow mmapped ring buffer to be split When the ring buffer VMA is split by a partial munmap or a MAP_FIXED, the kernel calls vm_ops->close() on each portion. This causes the ring_buffer_unmap() to be called multiple times. This causes subsequent calls to return -ENODEV and triggers a warning. There's no reason to allow user space to split up memory mapping of the ring buffer. Have it return -EINVAL when that happens. -----BEGIN PGP SIGNATURE----- iIoEABYKADIWIQRRSw7ePDh/lE+zeZMp5XQQmuv6qgUCaSdimBQccm9zdGVkdEBn b29kbWlzLm9yZwAKCRAp5XQQmuv6qucgAP9FFI/yHHS7HpZVKokH5Dcw1ORekdFd ZXX1fi3RNXGj/wD8DwBv42yaYPzL41muagmaV1NoNezwqYN5tFsHe5PxcAY= =6iCY -----END PGP SIGNATURE----- Merge tag 'trace-ringbuffer-v6.18-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace Pull ring-buffer fix from Steven Rostedt: - Do not allow mmapped ring buffer to be split When the ring buffer VMA is split by a partial munmap or a MAP_FIXED, the kernel calls vm_ops->close() on each portion. This causes the ring_buffer_unmap() to be called multiple times. This causes subsequent calls to return -ENODEV and triggers a warning. There's no reason to allow user space to split up memory mapping of the ring buffer. Have it return -EINVAL when that happens. * tag 'trace-ringbuffer-v6.18-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace: tracing: Fix WARN_ON in tracing_buffers_mmap_close for split VMAs |
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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.