9 Oct
2024
9 Oct
'24
11:05 a.m.
On Tue, Oct 08, 2024 at 03:36:42PM -0700, Deepak Gupta wrote:
Equivalent to landing pad (zicfilp) on x86 is `ENDBRANCH` instruction in Intel CET [3] and branch target identification (BTI) [4] on arm. Similarly x86's Intel CET has shadow stack [5] and arm64 has guarded control stack (GCS) [6] which are very similar to risc-v's zicfiss shadow stack.
x86 already supports shadow stack for user mode and arm64 support for GCS in usermode [7] is ongoing.
FWIW the arm64 support is now in -next, including these:
Mark Brown (2): mm: Introduce ARCH_HAS_USER_SHADOW_STACK prctl: arch-agnostic prctl for shadow stack
shared changes to generic code.