| Message ID | 20210312173811.58284-1-vladimir.murzin@arm.com (mailing list archive) |
|---|---|
| Headers | show |
| Series | arm64: Support Enhanced PAN | expand |
On Fri, 12 Mar 2021 17:38:09 +0000, Vladimir Murzin wrote: > ARM architecture gains support of Enhanced Privileged Access Never > (EPAN) which allows Privileged Access Never to be used with > Execute-only mappings. > > As a consequence 24cecc377463 ("arm64: Revert support for execute-only > user mappings") can be revisited and re-enabled. > > [...] Applied to arm64 (for-next/epan), thanks! [1/2] arm64: Support execute-only permissions with Enhanced PAN https://git.kernel.org/arm64/c/18107f8a2df6
Hi ARM architecture gains support of Enhanced Privileged Access Never (EPAN) which allows Privileged Access Never to be used with Execute-only mappings. As a consequence 24cecc377463 ("arm64: Revert support for execute-only user mappings") can be revisited and re-enabled. Changelog: RFC -> v1 - removed cap check in pte_valid_not_user (per Catalin) - local_flush_tlb_all() in cpu_enable_epan() (per Catalin) - reordered with CnP (per Catalin) - s/HWCAP2_EPAN/HWCAP2_EXECONLY/ (per Catalin) v1 -> v2 - rebased on for-next/uaccess (for INIT_SCTLR_EL1_MMU_ON) - moved EPAN enable to proc.S (via INIT_SCTLR_EL1_MMU_ON), so no need in enable method from cpufeature, no need to keep ordering relative to CnP (per Catalin) v2 -> v3 - rebased on 5.11-rc4 v3 -> v4 - rebased on 5.12-rc2 - restore comments around pte_valid_not_user and protection_map[] (per Will) - rework the vm_flags initialisation (per Will) - moved logic of pte_valid_user() into pte_access_permitted() (per Catalin) Thanks! Vladimir Murzin (2): arm64: Support execute-only permissions with Enhanced PAN arm64: Introduce HWCAPS2_EXECONLY arch/arm64/Kconfig | 17 +++++++++++++++ arch/arm64/include/asm/cpucaps.h | 3 ++- arch/arm64/include/asm/hwcap.h | 1 + arch/arm64/include/asm/pgtable-prot.h | 5 +++-- arch/arm64/include/asm/pgtable.h | 31 ++++++++++++++++++++------- arch/arm64/include/asm/sysreg.h | 4 +++- arch/arm64/include/uapi/asm/hwcap.h | 1 + arch/arm64/kernel/cpufeature.c | 15 +++++++++++++ arch/arm64/kernel/cpuinfo.c | 1 + arch/arm64/mm/fault.c | 18 +++++++++++++++- mm/mmap.c | 6 ++++++ 11 files changed, 89 insertions(+), 13 deletions(-)