77722bcd0f
This change resets the task's shadow stack pointer in init_idle, so the kernel can safely reuse the idle task when bringing up an offline CPU. Bug: 120293439 Bug: 112277034 Change-Id: I6dcefbab2d68e9a76b8b3e2e69ab5bd58fe31803 Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
78 lines
1.5 KiB
C
78 lines
1.5 KiB
C
/*
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* Shadow Call Stack support.
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*
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* Copyright (C) 2018 Google LLC
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*/
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#ifndef _LINUX_SCS_H
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#define _LINUX_SCS_H
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#ifdef CONFIG_SHADOW_CALL_STACK
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#include <linux/gfp.h>
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#include <linux/sched.h>
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#include <asm/page.h>
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#define SCS_SIZE 1024
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#define SCS_GFP (GFP_KERNEL | __GFP_ZERO)
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extern unsigned long init_shadow_call_stack[];
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static inline void *task_scs(struct task_struct *tsk)
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{
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return task_thread_info(tsk)->shadow_call_stack;
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}
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static inline void task_set_scs(struct task_struct *tsk, void *s)
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{
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task_thread_info(tsk)->shadow_call_stack = s;
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}
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extern void scs_set_init_magic(struct task_struct *tsk);
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extern void scs_task_init(struct task_struct *tsk);
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extern void scs_task_reset(struct task_struct *tsk);
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extern int scs_prepare(struct task_struct *tsk, int node);
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extern bool scs_corrupted(struct task_struct *tsk);
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extern void scs_release(struct task_struct *tsk);
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#else /* CONFIG_SHADOW_CALL_STACK */
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static inline void *task_scs(struct task_struct *tsk)
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{
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return 0;
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}
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static inline void task_set_scs(struct task_struct *tsk, void *s)
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{
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}
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static inline void scs_set_init_magic(struct task_struct *tsk)
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{
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}
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static inline void scs_task_init(struct task_struct *tsk)
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{
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}
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static inline void scs_task_reset(struct task_struct *tsk)
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{
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}
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static inline int scs_prepare(struct task_struct *tsk, int node)
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{
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return 0;
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}
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static inline bool scs_corrupted(struct task_struct *tsk)
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{
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return false;
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}
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static inline void scs_release(struct task_struct *tsk)
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{
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}
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#endif /* CONFIG_SHADOW_CALL_STACK */
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#endif /* _LINUX_SCS_H */
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