65 lines
1.5 KiB
C
65 lines
1.5 KiB
C
/*
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* This file contains stacktrace functions that are in RHEL kABI whitelist.
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*/
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static int save_stack_address(struct stack_trace *trace, unsigned long addr,
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bool nosched)
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{
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if (nosched && in_sched_functions(addr))
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return 0;
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if (trace->skip > 0) {
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trace->skip--;
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return 0;
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}
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if (trace->nr_entries >= trace->max_entries)
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return -1;
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trace->entries[trace->nr_entries++] = addr;
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return 0;
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}
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static void noinline __save_stack_trace(struct stack_trace *trace,
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struct task_struct *task, struct pt_regs *regs,
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bool nosched)
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{
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struct unwind_state state;
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unsigned long addr;
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if (regs)
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save_stack_address(trace, regs->ip, nosched);
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for (unwind_start(&state, task, regs, NULL); !unwind_done(&state);
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unwind_next_frame(&state)) {
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addr = unwind_get_return_address(&state);
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if (!addr || save_stack_address(trace, addr, nosched))
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break;
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}
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if (trace->nr_entries < trace->max_entries)
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trace->entries[trace->nr_entries++] = ULONG_MAX;
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}
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/*
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* Save stack-backtrace addresses into a stack_trace buffer.
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*/
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void save_stack_trace(struct stack_trace *trace)
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{
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trace->skip++;
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__save_stack_trace(trace, current, NULL, false);
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}
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EXPORT_SYMBOL_GPL(save_stack_trace);
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void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
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{
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if (!try_get_task_stack(tsk))
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return;
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if (tsk == current)
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trace->skip++;
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__save_stack_trace(trace, tsk, NULL, true);
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put_task_stack(tsk);
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}
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EXPORT_SYMBOL_GPL(save_stack_trace_tsk);
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