tree 30d949dc857a11ebd5ebd5920b49cbc46edd65f6
parent f1bbc4e9cfa4c0f29883171e9d01c01cbe94becc
author Catalin Marinas <catalin.marinas@arm.com> 1710273620 +0000
committer Catalin Marinas <catalin.marinas@arm.com> 1710327200 +0000

Revert "arm64: mm: add support for WXN memory translation attribute"

This reverts commit 50e3ed0f93f4f62ed2aa83de5db6cb84ecdd5707.

The SCTLR_EL1.WXN control forces execute-never when a page has write
permissions. While the idea of hardening such write/exec combinations is
good, with permissions indirection enabled (FEAT_PIE) this control
becomes RES0. FEAT_PIE introduces a slightly different form of WXN which
only has an effect when the base permission is RWX and the write is
toggled by the permission overlay (FEAT_POE, not yet supported by the
arm64 kernel). Revert the patch for now.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Link: https://lore.kernel.org/r/ZfGESD3a91lxH367@arm.com