git: be86256cba - main - Status/2023Q1/aarch64-kasan.adoc: Add report

The branch main has been updated by salvadore:

URL: https://cgit.FreeBSD.org/doc/commit/?id=be86256cba5a9796c709f3b34ba9a103cff17c6b

commit be86256cba5a9796c709f3b34ba9a103cff17c6b
Author:     Kyle Evans <kevans@FreeBSD.org>
AuthorDate: 2023-03-27 20:50:31 +0000
Commit:     Lorenzo Salvadore <salvadore@FreeBSD.org>
CommitDate: 2023-03-27 20:54:17 +0000

    Status/2023Q1/aarch64-kasan.adoc: Add report
    
    Reviewed by:    status (Pau Amma <pauamma@gundo.com)
    Approved by:    dbaio (co-mentor)
    Pull Request:   https://github.com/freebsd/freebsd-doc/pull/137
---
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 1 file changed, 23 insertions(+)

diff --git a/website/content/en/status/report-2023-01-2023-03/aarch64-kasan.adoc b/website/content/en/status/report-2023-01-2023-03/aarch64-kasan.adoc
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+=== Kernel Address Sanitizer on AArch64
+
+Contact: Kyle Evans <kevans@FreeBSD.org>
+
+Sanitizers are bug detection facilities which use a combination of instrumentation inserted by the compiler (LLVM in this case) and runtime state tracking to detect bugs in C code.
+They can automatically detect many types of C programming bugs, such as use-after-frees and uses of uninitialized variables, which may otherwise require substantial effort to identify.
+They are particularly effective in combination with regression testing suites or fuzzing tools such as link:https://github.com/google/syzkaller[syzkaller].
+Unlike tools such as Valgrind, software must be recompiled to enable a given sanitizer, but sanitizers can be used in the kernel.
+Kernels with sanitizers enabled incur a significant performance overhead from the runtime, in both CPU utilization and memory usage.
+
+As of gitref:89c52f9d59fa[repository=src], the kernel address sanitizer that was previously exclusive to amd64 has now been ported to arm64.
+
+Prior testing has been done on a decent variety of machines, including:
+
+- Various Ampere Altra machines
+- QEMU
+- Microsoft's "Volterra" Devkit
+- BHyve (WIP)
+
+Further testing on other hardware would be both welcomed and appreciated.
+
+Sponsor: Juniper Networks, Inc. +
+Sponsor: Klara, Inc.