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Even non-KASLR kernels can be built as relocatable, to work around broken bootloaders that violate the rules regarding physical placement of the kernel image - in this case, the physical offset modulo 2 MiB is used as the KASLR offset, and all absolute symbol references are fixed up in the usual way. This workaround is enabled by default. CONFIG_RELOCATABLE can also be disabled entirely, in which case the relocation code and the code that captures the offset are omitted from the build. However, since commitaacd149b62("arm64: head: avoid relocating the kernel twice for KASLR"), this code got out of sync, and we still add the offset to the kernel virtual address before populating the page tables even though we never capture it. This means we add a bogus value instead, breaking the boot entirely. Fixes:aacd149b62("arm64: head: avoid relocating the kernel twice for KASLR") Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Tested-by: Mikulas Patocka <mpatocka@redhat.com> Link: https://lore.kernel.org/r/20220827070904.2216989-1-ardb@kernel.org Signed-off-by: Will Deacon <will@kernel.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 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.