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Alexandre Ghiti <alexghiti@rivosinc.com> says: Those 2 patches fix the set_memory_XX() and set_direct_map_XX() APIs, which in turn fix STRICT_KERNEL_RWX and memfd_secret(). Those were broken since the permission changes were not applied to the linear mapping because the linear mapping is mapped using hugepages and walk_page_range_novma() does not split such mappings. To fix that, patch 1 disables PGD mappings in the linear mapping as it is hard to propagate changes at this level in *all* the page tables, this has the downside of disabling PMD mapping for sv32 and PUD (1GB) mapping for sv39 in the linear mapping (for specific kernels, we could add a Kconfig to enable ARCH_HAS_SET_DIRECT_MAP and STRICT_KERNEL_RWX if needed, I'm pretty sure we'll discuss that). patch 2 implements the split of the huge linear mappings so that walk_page_range_novma() can properly apply the permissions. The whole split is protected with mmap_sem in write mode, but I'm wondering if that's enough, any opinion on that is appreciated. * b4-shazam-merge: riscv: Fix set_memory_XX() and set_direct_map_XX() by splitting huge linear mappings riscv: Don't use PGD entries for the linear mapping Link: https://lore.kernel.org/r/20231108075930.7157-1-alexghiti@rivosinc.com Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com> |
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| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| io_uring | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| 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 | ||
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.