mirror of
https://github.com/torvalds/linux
synced 2024-10-15 15:59:15 +00:00
dd66409900
In fill_thread_core_info() the ptrace accessible registers are collected to be written out as notes in a core file. The note array is allocated from a size calculated by iterating the user regset view, and counting the regsets that have a non-zero core_note_type. However, this only allows for there to be non-zero core_note_type at the end of the regset view. If there are any gaps in the middle, fill_thread_core_info() will overflow the note allocation, as it iterates over the size of the view and the allocation would be smaller than that. There doesn't appear to be any arch that has gaps such that they exceed the notes allocation, but the code is brittle and tries to support something it doesn't. It could be fixed by increasing the allocation size, but instead just have the note collecting code utilize the array better. This way the allocation can stay smaller. Even in the case of no arch's that have gaps in their regset views, this introduces a change in the resulting indicies of t->notes. It does not introduce any changes to the core file itself, because any blank notes are skipped in write_note_info(). In case, the allocation logic between fill_note_info() and fill_thread_core_info() ever diverges from the usage logic, warn and skip writing any notes that would overflow the array. This fix is derrived from an earlier one[0] by Yu-cheng Yu. [0] https://lore.kernel.org/lkml/20180717162502.32274-1-yu-cheng.yu@intel.com/ Co-developed-by: Yu-cheng Yu <yu-cheng.yu@intel.com> Signed-off-by: Yu-cheng Yu <yu-cheng.yu@intel.com> Signed-off-by: Rick Edgecombe <rick.p.edgecombe@intel.com> Signed-off-by: Kees Cook <keescook@chromium.org> Link: https://lore.kernel.org/r/20220317192013.13655-4-rick.p.edgecombe@intel.com |
||
|---|---|---|
| arch | ||
| block | ||
| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| 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.