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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 13:05:39 +0100
commit90d6dfb05675c96e1f4cd35187d2fb783fc00204 (patch)
treeedff3465d15f4306df227febce2b9b1b56569f76
parent0119a5f4785e77d21df99968a751b1bb65af9a9b (diff)
downloadglibc-nsz/pacbti-v7.tar.gz
aarch64: add NEWS entry about branch protection supportnsz/pacbti-v7
This is a new security feature that relies on architecture extensions and needs glibc to be built with a gcc configured with branch protection.
-rw-r--r--NEWS11
1 files changed, 11 insertions, 0 deletions
diff --git a/NEWS b/NEWS
index d7282b4ad5..5083f5eacf 100644
--- a/NEWS
+++ b/NEWS
@@ -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