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f39f21b3dd
filter_irq_stacks() has little to do with the stackdepot implementation, except that it is usually used by users (such as KASAN) of stackdepot to reduce the stack trace. However, filter_irq_stacks() itself is not useful without a stack trace as obtained by stack_trace_save() and friends. Therefore, move filter_irq_stacks() to kernel/stacktrace.c, so that new users of filter_irq_stacks() do not have to start depending on STACKDEPOT only for filter_irq_stacks(). Link: https://lkml.kernel.org/r/20210923104803.2620285-1-elver@google.com Signed-off-by: Marco Elver <elver@google.com> Acked-by: Dmitry Vyukov <dvyukov@google.com> Cc: Alexander Potapenko <glider@google.com> Cc: Jann Horn <jannh@google.com> Cc: Aleksandr Nogikh <nogikh@google.com> Cc: Taras Madan <tarasmadan@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
110 lines
4 KiB
C
110 lines
4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __LINUX_STACKTRACE_H
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#define __LINUX_STACKTRACE_H
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#include <linux/types.h>
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#include <asm/errno.h>
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struct task_struct;
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struct pt_regs;
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#ifdef CONFIG_STACKTRACE
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void stack_trace_print(const unsigned long *trace, unsigned int nr_entries,
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int spaces);
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int stack_trace_snprint(char *buf, size_t size, const unsigned long *entries,
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unsigned int nr_entries, int spaces);
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unsigned int stack_trace_save(unsigned long *store, unsigned int size,
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unsigned int skipnr);
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unsigned int stack_trace_save_tsk(struct task_struct *task,
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unsigned long *store, unsigned int size,
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unsigned int skipnr);
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unsigned int stack_trace_save_regs(struct pt_regs *regs, unsigned long *store,
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unsigned int size, unsigned int skipnr);
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unsigned int stack_trace_save_user(unsigned long *store, unsigned int size);
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unsigned int filter_irq_stacks(unsigned long *entries, unsigned int nr_entries);
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/* Internal interfaces. Do not use in generic code */
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#ifdef CONFIG_ARCH_STACKWALK
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/**
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* stack_trace_consume_fn - Callback for arch_stack_walk()
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* @cookie: Caller supplied pointer handed back by arch_stack_walk()
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* @addr: The stack entry address to consume
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*
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* Return: True, if the entry was consumed or skipped
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* False, if there is no space left to store
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*/
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typedef bool (*stack_trace_consume_fn)(void *cookie, unsigned long addr);
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/**
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* arch_stack_walk - Architecture specific function to walk the stack
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* @consume_entry: Callback which is invoked by the architecture code for
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* each entry.
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* @cookie: Caller supplied pointer which is handed back to
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* @consume_entry
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* @task: Pointer to a task struct, can be NULL
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* @regs: Pointer to registers, can be NULL
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*
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* ============ ======= ============================================
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* task regs
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* ============ ======= ============================================
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* task NULL Stack trace from task (can be current)
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* current regs Stack trace starting on regs->stackpointer
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* ============ ======= ============================================
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*/
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void arch_stack_walk(stack_trace_consume_fn consume_entry, void *cookie,
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struct task_struct *task, struct pt_regs *regs);
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/**
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* arch_stack_walk_reliable - Architecture specific function to walk the
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* stack reliably
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*
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* @consume_entry: Callback which is invoked by the architecture code for
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* each entry.
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* @cookie: Caller supplied pointer which is handed back to
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* @consume_entry
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* @task: Pointer to a task struct, can be NULL
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*
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* This function returns an error if it detects any unreliable
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* features of the stack. Otherwise it guarantees that the stack
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* trace is reliable.
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*
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* If the task is not 'current', the caller *must* ensure the task is
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* inactive and its stack is pinned.
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*/
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int arch_stack_walk_reliable(stack_trace_consume_fn consume_entry, void *cookie,
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struct task_struct *task);
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void arch_stack_walk_user(stack_trace_consume_fn consume_entry, void *cookie,
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const struct pt_regs *regs);
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#else /* CONFIG_ARCH_STACKWALK */
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struct stack_trace {
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unsigned int nr_entries, max_entries;
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unsigned long *entries;
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unsigned int skip; /* input argument: How many entries to skip */
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};
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extern void save_stack_trace(struct stack_trace *trace);
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extern void save_stack_trace_regs(struct pt_regs *regs,
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struct stack_trace *trace);
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extern void save_stack_trace_tsk(struct task_struct *tsk,
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struct stack_trace *trace);
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extern int save_stack_trace_tsk_reliable(struct task_struct *tsk,
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struct stack_trace *trace);
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extern void save_stack_trace_user(struct stack_trace *trace);
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#endif /* !CONFIG_ARCH_STACKWALK */
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#endif /* CONFIG_STACKTRACE */
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#if defined(CONFIG_STACKTRACE) && defined(CONFIG_HAVE_RELIABLE_STACKTRACE)
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int stack_trace_save_tsk_reliable(struct task_struct *tsk, unsigned long *store,
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unsigned int size);
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#else
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static inline int stack_trace_save_tsk_reliable(struct task_struct *tsk,
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unsigned long *store,
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unsigned int size)
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{
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return -ENOSYS;
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}
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#endif
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#endif /* __LINUX_STACKTRACE_H */
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