c23965b7f7
Call to rpmsg_ctrldev_ioctl() and rpmsg_ctrldev_remove() must be synchronized. In present code rpmsg_ctrldev_remove() is not protected with lock, therefore new char device creation can succeed through rpmsg_ctrldev_ioctl() call. At the same time call to rpmsg_ctrldev_remove() function for ctrl device removal will free associated rpdev device. As char device creation already succeeded, user space is free to issue open() call which maps to rpmsg_create_ept() in kernel. rpmsg_create_ept() function tries to reference rpdev which has already been freed through rpmsg_ctrldev_remove(). Issue is predominantly seen in aggressive reboot tests where rpmsg_ctrldev_ioctl() and rpmsg_ctrldev_remove() can race with each other. Adding lock in rpmsg_ctrldev_remove() avoids any new char device creation through rpmsg_ctrldev_ioctl() while remove call is already in progress. Signed-off-by: Deepak Kumar Singh <quic_deesin@quicinc.com> Signed-off-by: Bjorn Andersson <andersson@kernel.org> Link: https://lore.kernel.org/r/1663584840-15762-3-git-send-email-quic_deesin@quicinc.com |
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|---|---|---|
| Documentation | ||
| LICENSES | ||
| arch | ||
| block | ||
| certs | ||
| crypto | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| io_uring | ||
| ipc | ||
| kernel | ||
| lib | ||
| mm | ||
| net | ||
| rust | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| .rustfmt.toml | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| README | ||
README
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 Restructured Text 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.