Andrei Vagin 1864d9d091 Untag user addresses before handling them in the Sentry ...

Top-Byte-Ignore (TBI) is a feature on all ARMv8.0 CPUs that causes the top byte
of virtual addresses to be ignored on loads and stores. Instead, bit 55 is
extended over bits 56-63 before address translation. This feature allows use of
the (ignored) top byte as a tag or for other in-band metadata.

In Linux, brk()/mmap()/mremap() syscalls don't untag addresses. More details
are in dcde237319e6 ("mm: Avoid creating virtual address aliases in
brk()/mmap()/mremap()")

PiperOrigin-RevId: 715885990

2025-01-15 11:52:40 -08:00

..

BUILD

Re-order loads in BUILD files to make transformations reversible in Copybara.

2024-01-16 11:21:40 -08:00

futex_test.go

switch fsimpl/ from sync/atomic to atomicbitops for 32 bit values

2022-04-21 18:32:04 -07:00

futex.go

Untag user addresses before handling them in the Sentry

2025-01-15 11:52:40 -08:00