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3df48c981d
In commit 330a1eb "Core EBB support for 64-bit book3s" I messed up
clear_task_ebb(). It clears some but not all of the task's Event Based
Branch (EBB) registers when we duplicate a task struct.
That allows a child task to observe the EBBHR & EBBRR of its parent,
which it should not be able to do.
Fix it by clearing EBBHR & EBBRR.
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Cc: stable@vger.kernel.org [v3.11+]
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
102 lines
2.6 KiB
C
102 lines
2.6 KiB
C
/*
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* Copyright (C) 1999 Cort Dougan <cort@cs.nmt.edu>
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*/
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#ifndef _ASM_POWERPC_SWITCH_TO_H
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#define _ASM_POWERPC_SWITCH_TO_H
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struct thread_struct;
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struct task_struct;
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struct pt_regs;
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extern struct task_struct *__switch_to(struct task_struct *,
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struct task_struct *);
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#define switch_to(prev, next, last) ((last) = __switch_to((prev), (next)))
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struct thread_struct;
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extern struct task_struct *_switch(struct thread_struct *prev,
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struct thread_struct *next);
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#ifdef CONFIG_PPC_BOOK3S_64
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static inline void save_early_sprs(struct thread_struct *prev)
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{
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if (cpu_has_feature(CPU_FTR_ARCH_207S))
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prev->tar = mfspr(SPRN_TAR);
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if (cpu_has_feature(CPU_FTR_DSCR))
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prev->dscr = mfspr(SPRN_DSCR);
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}
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#else
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static inline void save_early_sprs(struct thread_struct *prev) {}
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#endif
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extern void enable_kernel_fp(void);
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extern void enable_kernel_altivec(void);
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extern int emulate_altivec(struct pt_regs *);
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extern void __giveup_vsx(struct task_struct *);
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extern void giveup_vsx(struct task_struct *);
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extern void enable_kernel_spe(void);
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extern void giveup_spe(struct task_struct *);
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extern void load_up_spe(struct task_struct *);
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extern void switch_booke_debug_regs(struct debug_reg *new_debug);
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#ifndef CONFIG_SMP
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extern void discard_lazy_cpu_state(void);
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#else
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static inline void discard_lazy_cpu_state(void)
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{
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}
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#endif
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#ifdef CONFIG_PPC_FPU
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extern void flush_fp_to_thread(struct task_struct *);
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extern void giveup_fpu(struct task_struct *);
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#else
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static inline void flush_fp_to_thread(struct task_struct *t) { }
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static inline void giveup_fpu(struct task_struct *t) { }
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#endif
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#ifdef CONFIG_ALTIVEC
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extern void flush_altivec_to_thread(struct task_struct *);
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extern void giveup_altivec(struct task_struct *);
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extern void giveup_altivec_notask(void);
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#else
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static inline void flush_altivec_to_thread(struct task_struct *t)
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{
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}
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static inline void giveup_altivec(struct task_struct *t)
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{
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}
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#endif
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#ifdef CONFIG_VSX
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extern void flush_vsx_to_thread(struct task_struct *);
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#else
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static inline void flush_vsx_to_thread(struct task_struct *t)
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{
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}
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#endif
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#ifdef CONFIG_SPE
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extern void flush_spe_to_thread(struct task_struct *);
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#else
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static inline void flush_spe_to_thread(struct task_struct *t)
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{
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}
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#endif
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static inline void clear_task_ebb(struct task_struct *t)
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{
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#ifdef CONFIG_PPC_BOOK3S_64
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/* EBB perf events are not inherited, so clear all EBB state. */
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t->thread.ebbrr = 0;
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t->thread.ebbhr = 0;
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t->thread.bescr = 0;
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t->thread.mmcr2 = 0;
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t->thread.mmcr0 = 0;
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t->thread.siar = 0;
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t->thread.sdar = 0;
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t->thread.sier = 0;
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t->thread.used_ebb = 0;
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#endif
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}
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#endif /* _ASM_POWERPC_SWITCH_TO_H */
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