Re: [PATCH v16 0/9] arm64: ARMv8.5-A: MTE: Add async mode support

On Mon, 15 Mar 2021 13:20:10 +0000, Vincenzo Frascino wrote:

This patchset implements the asynchronous mode support for ARMv8.5-A
Memory Tagging Extension (MTE), which is a debugging feature that allows
to detect with the help of the architecture the C and C++ programmatic
memory errors like buffer overflow, use-after-free, use-after-return, etc.

MTE is built on top of the AArch64 v8.0 virtual address tagging TBI
(Top Byte Ignore) feature and allows a task to set a 4 bit tag on any
subset of its address space that is multiple of a 16 bytes granule. MTE
is based on a lock-key mechanism where the lock is the tag associated to
the physical memory and the key is the tag associated to the virtual
address.
When MTE is enabled and tags are set for ranges of address space of a task,
the PE will compare the tag related to the physical memory with the tag
related to the virtual address (tag check operation). Access to the memory
is granted only if the two tags match. In case of mismatch the PE will raise
an exception.

[...]

Applied to arm64 (for-next/mte-async-kernel-mode) but with a note that
I'll drop them if Andrew prefers to take the patches via the mm tree.
Thanks!

[1/9] arm64: mte: Add asynchronous mode support
      https://git.kernel.org/arm64/c/f3b7deef8dca
[2/9] kasan: Add KASAN mode kernel parameter
      https://git.kernel.org/arm64/c/2603f8a78dfb
[3/9] arm64: mte: Drop arch_enable_tagging()
      https://git.kernel.org/arm64/c/c137c6145b11
[4/9] kasan: Add report for async mode
      https://git.kernel.org/arm64/c/8f7b5054755e
[5/9] arm64: mte: Enable TCO in functions that can read beyond buffer limits
      https://git.kernel.org/arm64/c/e60beb95c08b
[6/9] arm64: mte: Conditionally compile mte_enable_kernel_*()
      https://git.kernel.org/arm64/c/d8969752cc4e
[7/9] arm64: mte: Enable async tag check fault
      https://git.kernel.org/arm64/c/65812c6921cc
[8/9] arm64: mte: Report async tag faults before suspend
      https://git.kernel.org/arm64/c/eab0e6e17d87
[9/9] kasan, arm64: tests supports for HW_TAGS async mode
      https://git.kernel.org/arm64/c/e80a76aa1a91

-- 
Catalin


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