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eae9523fdd
The Clang backtrace code dereferences the link register value pulled from the stack to decide whether the caller was a branch-and-link instruction, in order to subsequently decode the offset to find the start of the calling function. Unlike other loads in this routine, this one is not protected by a fixup, and may therefore cause a crash if the address in question is bogus. So let's fix this, by treating the fault as a failure to decode the 'bl' instruction. To avoid a label renum, reuse a fixup label that guards an instruction that cannot fault to begin with. Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Reviewed-by: Nick Desaulniers <ndesaulniers@google.com> Tested-by: Marc Zyngier <maz@kernel.org> Tested-by: Vladimir Murzin <vladimir.murzin@arm.com> # ARMv7M
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.