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We have special logic to suppress MTE tag check fault reporting, based on a global `mte_report_once` and `reported` variables. These can be used to suppress calling kasan_report() when taking a tag check fault, but do not prevent taking the fault in the first place, nor does they affect the way we disable tag checks upon taking a fault. The core KASAN code already defaults to reporting a single fault, and has a `multi_shot` control to permit reporting multiple faults. The only place we transiently alter `mte_report_once` is in lib/test_kasan.c, where we also the `multi_shot` state as the same time. Thus `mte_report_once` and `reported` are redundant, and can be removed. When a tag check fault is taken, tag checking will be disabled by `do_tag_recovery` and must be explicitly re-enabled if desired. The test code does this by calling kasan_enable_tagging_sync(). This patch removes the redundant mte_report_once() logic and associated variables. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Cc: Alexander Potapenko <glider@google.com> Cc: Andrey Konovalov <andreyknvl@gmail.com> Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Will Deacon <will@kernel.org> Cc: Vincenzo Frascino <vincenzo.frascino@arm.com> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Reviewed-by: Andrey Konovalov <andreyknvl@gmail.com> Tested-by: Andrey Konovalov <andreyknvl@gmail.com> Link: https://lore.kernel.org/r/20210714143843.56537-4-mark.rutland@arm.com Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> |
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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.