Messages in this thread |  | | Date | Tue, 27 Sep 2022 08:18:38 +0800 | From | Jisheng Zhang <> | Subject | Re: [PATCH 3/4] riscv: fix race when vmap stack overflow and remove shadow_stack |
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> > #ifdef CONFIG_VMAP_STACK > > -static DEFINE_PER_CPU(unsigned long [OVERFLOW_STACK_SIZE/sizeof(long)], > > - overflow_stack)__aligned(16); > > -/* > > - * shadow stack, handled_ kernel_ stack_ overflow(in kernel/entry.S) is used > > - * to get per-cpu overflow stack(get_overflow_stack). > > - */ > > -long shadow_stack[SHADOW_OVERFLOW_STACK_SIZE/sizeof(long)]; > > -asmlinkage unsigned long get_overflow_stack(void) > > -{ > > - return (unsigned long)this_cpu_ptr(overflow_stack) + > > - OVERFLOW_STACK_SIZE; > > -} > > +unsigned long overflow_stack[NR_CPUS][OVERFLOW_STACK_SIZE/sizeof(long)] __aligned(16);
If NR_CPUS is large, there's a non-trival memory waste, I have a solution for this case, will send a new version today.
Thanks
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