Re: [PATCH v6 06/33] riscv/Kconfig: enable HAVE_EXIT_THREAD for riscv

[PATCH v6 00/33] riscv control-flow integrity for usermode · Deepak Gupta <hidden> · 2024-10-08
[PATCH v6 01/33] mm: Introduce ARCH_HAS_USER_SHADOW_STACK · Deepak Gupta <hidden> · 2024-10-08
[PATCH v6 02/33] mm: helper `is_shadow_stack_vma` to check shadow stack vma · Deepak Gupta <hidden> · 2024-10-08
Re: [PATCH v6 02/33] mm: helper `is_shadow_stack_vma` to check shadow stack vma · Mark Brown <broonie@kernel.org> · 2024-10-09
[PATCH v6 03/33] riscv: Enable cbo.zero only when all harts support Zicboz · Deepak Gupta <hidden> · 2024-10-08
[PATCH v6 04/33] riscv: Add support for per-thread envcfg CSR values · Deepak Gupta <hidden> · 2024-10-08
[PATCH v6 05/33] riscv: Call riscv_user_isa_enable() only on the boot hart · Deepak Gupta <hidden> · 2024-10-08
[PATCH v6 06/33] riscv/Kconfig: enable HAVE_EXIT_THREAD for riscv · Deepak Gupta <hidden> · 2024-10-08
Re: [PATCH v6 06/33] riscv/Kconfig: enable HAVE_EXIT_THREAD for riscv · Mark Brown <broonie@kernel.org> · 2024-10-09
Re: [PATCH v6 06/33] riscv/Kconfig: enable HAVE_EXIT_THREAD for riscv · Deepak Gupta <hidden> · 2024-10-29
[PATCH v6 07/33] dt-bindings: riscv: zicfilp and zicfiss in dt-bindings (extensions.yaml) · Deepak Gupta <hidden> · 2024-10-08
Re: [PATCH v6 07/33] dt-bindings: riscv: zicfilp and zicfiss in dt-bindings (extensions.yaml) · "Rob Herring (Arm)" <robh@kernel.org> · 2024-10-25
[PATCH v6 08/33] riscv: zicfiss / zicfilp enumeration · Deepak Gupta <hidden> · 2024-10-08
[PATCH v6 09/33] riscv: zicfiss / zicfilp extension csr and bit definitions · Deepak Gupta <hidden> · 2024-10-08
[PATCH v6 10/33] riscv: usercfi state for task and save/restore of CSR_SSP on trap entry/exit · Deepak Gupta <hidden> · 2024-10-08
[PATCH v6 11/33] riscv/mm : ensure PROT_WRITE leads to VM_READ | VM_WRITE · Deepak Gupta <hidden> · 2024-10-08
Re: [PATCH v6 11/33] riscv/mm : ensure PROT_WRITE leads to VM_READ | VM_WRITE · Lorenzo Stoakes <hidden> · 2024-10-09
Re: [PATCH v6 11/33] riscv/mm : ensure PROT_WRITE leads to VM_READ | VM_WRITE · Deepak Gupta <hidden> · 2024-10-10
[PATCH v6 12/33] riscv mm: manufacture shadow stack pte · Deepak Gupta <hidden> · 2024-10-08
[PATCH v6 13/33] riscv mmu: teach pte_mkwrite to manufacture shadow stack PTEs · Deepak Gupta <hidden> · 2024-10-08
[PATCH v6 14/33] riscv mmu: write protect and shadow stack · Deepak Gupta <hidden> · 2024-10-08
[PATCH v6 15/33] riscv/mm: Implement map_shadow_stack() syscall · Deepak Gupta <hidden> · 2024-10-08
[PATCH v6 16/33] riscv/shstk: If needed allocate a new shadow stack on clone · Deepak Gupta <hidden> · 2024-10-08
Re: [PATCH v6 16/33] riscv/shstk: If needed allocate a new shadow stack on clone · "Edgecombe, Rick P" <rick.p.edgecombe@intel.com> · 2024-10-08
Re: [PATCH v6 16/33] riscv/shstk: If needed allocate a new shadow stack on clone · Deepak Gupta <hidden> · 2024-10-08
Re: [PATCH v6 16/33] riscv/shstk: If needed allocate a new shadow stack on clone · "Edgecombe, Rick P" <rick.p.edgecombe@intel.com> · 2024-10-08
Re: [PATCH v6 16/33] riscv/shstk: If needed allocate a new shadow stack on clone · Mark Brown <broonie@kernel.org> · 2024-10-09
[PATCH v6 17/33] prctl: arch-agnostic prctl for shadow stack · Deepak Gupta <hidden> · 2024-10-08
[PATCH v6 18/33] prctl: arch-agnostic prctl for indirect branch tracking · Deepak Gupta <hidden> · 2024-10-08
Re: [PATCH v6 18/33] prctl: arch-agnostic prctl for indirect branch tracking · Mark Brown <broonie@kernel.org> · 2024-10-09
[PATCH v6 19/33] riscv: Implements arch agnostic shadow stack prctls · Deepak Gupta <hidden> · 2024-10-08
Re: [PATCH v6 19/33] riscv: Implements arch agnostic shadow stack prctls · Mark Brown <broonie@kernel.org> · 2024-10-09
[PATCH v6 20/33] riscv: Implements arch agnostic indirect branch tracking prctls · Deepak Gupta <hidden> · 2024-10-08
[PATCH v6 21/33] riscv/traps: Introduce software check exception · Deepak Gupta <hidden> · 2024-10-08
[PATCH v6 22/33] riscv: signal: abstract header saving for setup_sigcontext · Deepak Gupta <hidden> · 2024-10-08
[PATCH v6 23/33] riscv/signal: save and restore of shadow stack for signal · Deepak Gupta <hidden> · 2024-10-08
[PATCH v6 24/33] riscv/kernel: update __show_regs to print shadow stack register · Deepak Gupta <hidden> · 2024-10-08
[PATCH v6 25/33] riscv/ptrace: riscv cfi status and state via ptrace and in core files · Deepak Gupta <hidden> · 2024-10-08
[PATCH v6 26/33] riscv/hwprobe: zicfilp / zicfiss enumeration in hwprobe · Deepak Gupta <hidden> · 2024-10-08
[PATCH v6 27/33] riscv: Add Firmware Feature SBI extensions definitions · Deepak Gupta <hidden> · 2024-10-08
[PATCH v6 28/33] riscv: enable kernel access to shadow stack memory via FWFT sbi call · Deepak Gupta <hidden> · 2024-10-08
[PATCH v6 29/33] riscv: kernel command line option to opt out of user cfi · Deepak Gupta <hidden> · 2024-10-08
[PATCH v6 30/33] riscv: create a config for shadow stack and landing pad instr support · Deepak Gupta <hidden> · 2024-10-08
[PATCH v6 31/33] riscv: Documentation for landing pad / indirect branch tracking · Deepak Gupta <hidden> · 2024-10-08
[PATCH v6 32/33] riscv: Documentation for shadow stack on riscv · Deepak Gupta <hidden> · 2024-10-08
[PATCH v6 33/33] kselftest/riscv: kselftest for user mode cfi · Deepak Gupta <hidden> · 2024-10-08
Re: [PATCH v6 33/33] kselftest/riscv: kselftest for user mode cfi · Zong Li <hidden> · 2024-10-11
Re: [PATCH v6 33/33] kselftest/riscv: kselftest for user mode cfi · Mark Brown <broonie@kernel.org> · 2024-10-11
Re: [PATCH v6 33/33] kselftest/riscv: kselftest for user mode cfi · Zong Li <hidden> · 2024-10-11
Re: [PATCH v6 33/33] kselftest/riscv: kselftest for user mode cfi · Deepak Gupta <hidden> · 2024-10-11
Re: [PATCH v6 33/33] kselftest/riscv: kselftest for user mode cfi · Zong Li <hidden> · 2024-10-14
Re: [PATCH v6 00/33] riscv control-flow integrity for usermode · Mark Brown <broonie@kernel.org> · 2024-10-09

From: Mark Brown <broonie@kernel.org>
Date: 2024-10-09 11:28:06
Also in: linux-arch, linux-devicetree, linux-fsdevel, linux-kselftest, linux-mm, linux-riscv, lkml

On Tue, Oct 08, 2024 at 03:36:48PM -0700, Deepak Gupta wrote:

riscv will need an implementation for exit_thread to clean up shadow stack
when thread exits. If current thread had shadow stack enabled, shadow
stack is allocated by default for any new thread.

FWIW both arm64 and x86 do this via deactivate_mm().  ISTR there's some
case where exit_thread() doesn't quite do the right thing but I can't
remember the specifics right now, possibly the vfork() case but ICBW?
In any case like Rick said factoring out the common patterns would be
good, keeping things aligned would support that.

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