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| author | Szabolcs Nagy <szabolcs.nagy@arm.com> | 2020-06-11 18:19:40 +0100 |
|---|---|---|
| committer | Szabolcs Nagy <szabolcs.nagy@arm.com> | 2020-06-12 14:34:39 +0100 |
| commit | 20e7c9d2cc21a22ec46924f66b24cf7ecf572320 (patch) | |
| tree | 370aa6fea73c01d1f09f5a19f7bb52c168a51ad5 /NEWS | |
| parent | a8aad403a6d9e4904a5699ebd4c26424ab105076 (diff) | |
| download | glibc-20e7c9d2cc21a22ec46924f66b24cf7ecf572320.zip glibc-20e7c9d2cc21a22ec46924f66b24cf7ecf572320.tar.gz glibc-20e7c9d2cc21a22ec46924f66b24cf7ecf572320.tar.bz2 | |
aarch64: add NEWS entry about branch protection supportnsz/pacbti-v4
This is a new security feature that relies on architecture
extensions and needs glibc to be built with a gcc configured
with branch protection.
Diffstat (limited to 'NEWS')
| -rw-r--r-- | NEWS | 12 |
1 files changed, 12 insertions, 0 deletions
@@ -31,6 +31,18 @@ Major new features: pthread_attr_getsigmask_np have been added. They allow applications to specify the signal mask of a thread created with pthread_create. +* 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. It is recommended to use GCC 10 or newer when + building glibc with branch protection. + Deprecated and removed features, and other changes affecting compatibility: * The deprecated <sys/sysctl.h> header and the sysctl function have been |