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Jann Horn
3ea36dc8dd
usbdev_mmap() creates VMAs which can only be used through usbdev_do_ioctl(), which requires FMODE_WRITE; so usbdev_mmap() is only useful with FMODE_WRITE. On typical Linux systems, files at /dev/bus/usb/*/* are mode 0664, so UIDs without any special privileges can't use usbdev_do_ioctl(), but they can still execute the usbdev_mmap() codepath. Check for FMODE_WRITE in usbdev_mmap() to reduce attack surface a little bit. Signed-off-by: Jann Horn <jannh@google.com> Link: https://lore.kernel.org/r/20241016-usbdev-mmap-require-write-v1-1-6f8256414d5c@google.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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.