| Message ID | 20240403234054.2020347-4-debug@rivosinc.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | riscv control-flow integrity for usermode | expand |
On Wed, Apr 03, 2024 at 04:34:51PM -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. > > Signed-off-by: Deepak Gupta <debug@rivosinc.com> > --- > arch/riscv/Kconfig | 1 + > arch/riscv/kernel/process.c | 5 +++++ > 2 files changed, 6 insertions(+) > > diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig > index e3142ce531a0..7e0b2bcc388f 100644 > --- a/arch/riscv/Kconfig > +++ b/arch/riscv/Kconfig > @@ -149,6 +149,7 @@ config RISCV > select HAVE_SAMPLE_FTRACE_DIRECT_MULTI > select HAVE_STACKPROTECTOR > select HAVE_SYSCALL_TRACEPOINTS > + select HAVE_EXIT_THREAD > select HOTPLUG_CORE_SYNC_DEAD if HOTPLUG_CPU > select IRQ_DOMAIN > select IRQ_FORCED_THREADING > diff --git a/arch/riscv/kernel/process.c b/arch/riscv/kernel/process.c > index d3109557f951..ce577cdc2af3 100644 > --- a/arch/riscv/kernel/process.c > +++ b/arch/riscv/kernel/process.c > @@ -200,6 +200,11 @@ int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src) > return 0; > } > > +void exit_thread(struct task_struct *tsk) > +{ > + > +} > + > int copy_thread(struct task_struct *p, const struct kernel_clone_args *args) > { > unsigned long clone_flags = args->flags; > -- > 2.43.2 > Reviewed-by: Charlie Jenkins <charlie@rivosinc.com>
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index e3142ce531a0..7e0b2bcc388f 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -149,6 +149,7 @@ config RISCV select HAVE_SAMPLE_FTRACE_DIRECT_MULTI select HAVE_STACKPROTECTOR select HAVE_SYSCALL_TRACEPOINTS + select HAVE_EXIT_THREAD select HOTPLUG_CORE_SYNC_DEAD if HOTPLUG_CPU select IRQ_DOMAIN select IRQ_FORCED_THREADING diff --git a/arch/riscv/kernel/process.c b/arch/riscv/kernel/process.c index d3109557f951..ce577cdc2af3 100644 --- a/arch/riscv/kernel/process.c +++ b/arch/riscv/kernel/process.c @@ -200,6 +200,11 @@ int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src) return 0; } +void exit_thread(struct task_struct *tsk) +{ + +} + int copy_thread(struct task_struct *p, const struct kernel_clone_args *args) { unsigned long clone_flags = args->flags;
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. Signed-off-by: Deepak Gupta <debug@rivosinc.com> --- arch/riscv/Kconfig | 1 + arch/riscv/kernel/process.c | 5 +++++ 2 files changed, 6 insertions(+)