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d31e86ef63
The TBI setup on arm64 is very strange: HW is set up to always do TBI, but the kernel enforcement for system calls is purely a software contract, and user space is supposed to mask off the top bits before the system call. Except all the actual brk/mmap/etc() system calls then mask it in kernel space anyway, and accept any TBI address. This basically unifies things and makes access_ok() also ignore it. This is an ABI change, but the current situation is very odd, and this change avoids the current mess and makes the kernel more permissive, and as such is unlikely to break anything. The way forward - for some possible future situation when people want to use more bits - is probably to introduce a new "I actually want the full 64-bit address space" prctl. But we should make sure that the software and hardware rules actually match at that point. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> |
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| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| io_uring | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| rust | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .editorconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| .rustfmt.toml | ||
| 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 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.