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authorSzabolcs Nagy <szabolcs.nagy@arm.com>2020-06-11 18:19:40 +0100
committerSzabolcs Nagy <szabolcs.nagy@arm.com>2020-07-08 15:02:38 +0100
commita2a83bf6d9f1d4d297c5378f0fda0d8f85bc75f2 (patch)
tree32604c18b3e04d6b49e7f3f0eaf4bd3d66e02179 /NEWS
parentd174ec248d5b6bba3842f425f036495b682c313f (diff)
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aarch64: add NEWS entry about branch protection support
This is a new security feature that relies on architecture extensions and needs glibc to be built with a gcc configured with branch protection.
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@@ -67,6 +67,17 @@ Major new features:
They should be used instead of sys_errlist and sys_nerr, both are
thread and async-signal safe. These functions are GNU extensions.
+* AArch64 now supports standard branch protection security hardening
+ in glibc when it is built with a GCC that is configured with
+ --enable-standard-branch-protection. This includes branch target
+ identification (BTI) and pointer authentication for return addresses
+ (PAC-RET). They require armv8.5-a and armv8.3-a architecture
+ extensions respectively for the protection to be effective,
+ otherwise the used instructions are nops. User code can use PAC-RET
+ without libc support, but BTI requires a libc that is built with BTI
+ support, otherwise runtime objects linked into user code will not be
+ BTI compatible.
+
Deprecated and removed features, and other changes affecting compatibility:
* The deprecated <sys/sysctl.h> header and the sysctl function have been