diff options
| -rw-r--r-- | arch/powerpc/kernel/process.c | 31 |
1 files changed, 30 insertions, 1 deletions
diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c index 110db94cdf3c..009833f928bf 100644 --- a/arch/powerpc/kernel/process.c +++ b/arch/powerpc/kernel/process.c @@ -1974,6 +1974,32 @@ static inline int valid_irq_stack(unsigned long sp, struct task_struct *p, return 0; } +static inline int valid_emergency_stack(unsigned long sp, struct task_struct *p, + unsigned long nbytes) +{ +#ifdef CONFIG_PPC64 + unsigned long stack_page; + unsigned long cpu = task_cpu(p); + + stack_page = (unsigned long)paca_ptrs[cpu]->emergency_sp - THREAD_SIZE; + if (sp >= stack_page && sp <= stack_page + THREAD_SIZE - nbytes) + return 1; + +# ifdef CONFIG_PPC_BOOK3S_64 + stack_page = (unsigned long)paca_ptrs[cpu]->nmi_emergency_sp - THREAD_SIZE; + if (sp >= stack_page && sp <= stack_page + THREAD_SIZE - nbytes) + return 1; + + stack_page = (unsigned long)paca_ptrs[cpu]->mc_emergency_sp - THREAD_SIZE; + if (sp >= stack_page && sp <= stack_page + THREAD_SIZE - nbytes) + return 1; +# endif +#endif + + return 0; +} + + int validate_sp(unsigned long sp, struct task_struct *p, unsigned long nbytes) { @@ -1985,7 +2011,10 @@ int validate_sp(unsigned long sp, struct task_struct *p, if (sp >= stack_page && sp <= stack_page + THREAD_SIZE - nbytes) return 1; - return valid_irq_stack(sp, p, nbytes); + if (valid_irq_stack(sp, p, nbytes)) + return 1; + + return valid_emergency_stack(sp, p, nbytes); } EXPORT_SYMBOL(validate_sp); |