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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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NEWS
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NEWS
@ -31,6 +31,18 @@ Major new features:
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pthread_attr_getsigmask_np have been added. They allow applications
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to specify the signal mask of a thread created with pthread_create.
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* AArch64 now supports standard branch protection security hardening
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in glibc when it is built with a GCC that is configured with
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--enable-standard-branch-protection. This includes branch target
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identification (BTI) and pointer authentication for return addresses
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(PAC-RET). They require armv8.5-a and armv8.3-a architecture
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extensions respectively for the protection to be effective,
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otherwise the used instructions are nops. User code can use PAC-RET
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without libc support, but BTI requires a libc that is built with BTI
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support, otherwise runtime objects linked into user code will not be
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BTI compatible. It is recommended to use GCC 10 or newer when
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building glibc with branch protection.
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Deprecated and removed features, and other changes affecting compatibility:
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* The deprecated <sys/sysctl.h> header and the sysctl function have been
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