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The linux-next integration testing tree
e2dc9bf3f5
Instead of loading a binary blob into a temporary file with shmem_kernel_file_setup load a binary blob into a temporary tmpfs filesystem. This means that the blob can be stored in an init section and discared, and it means the binary blob will have a filename so can be executed normally. The only tricky thing about this code is that in the helper function blob_to_mnt __fput_sync is used. That is because a file can not be executed if it is still open for write, and the ordinary delayed close for kernel threads does not happen soon enough, which causes the following exec to fail. The function umd_load_blob is not called with any locks so this should be safe. Executing the blob normally winds up correcting several problems with the user mode driver code discovered by Tetsuo Handa[1]. By passing an ordinary filename into the exec, it is no longer necessary to figure out how to turn a O_RDWR file descriptor into a properly referende counted O_EXEC file descriptor that forbids all writes. For path based LSMs there are no new special cases. [1] https://lore.kernel.org/linux-fsdevel/2a8775b4-1dd5-9d5c-aa42-9872445e0942@i-love.sakura.ne.jp/ v1: https://lkml.kernel.org/r/87d05mf0j9.fsf_-_@x220.int.ebiederm.org v2: https://lkml.kernel.org/r/87wo3p4p35.fsf_-_@x220.int.ebiederm.org Link: https://lkml.kernel.org/r/20200702164140.4468-8-ebiederm@xmission.com Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Acked-by: Alexei Starovoitov <ast@kernel.org> Tested-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com> |
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| certs | ||
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| 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.