kprobes, ftrace: Use NOKPROBE_SYMBOL macro in ftrace
Use NOKPROBE_SYMBOL macro to protect functions from kprobes instead of __kprobes annotation in ftrace. This applies nokprobe_inline annotation for some cases, because NOKPROBE_SYMBOL() will inhibit inlining by referring the symbol address. Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Steven Rostedt <rostedt@goodmis.org> Link: http://lkml.kernel.org/r/20140417081828.26341.55152.stgit@ltc230.yrl.intra.hitachi.co.jp Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Masami Hiramatsu
Ingo Molnar
parent
820aede020
commit
3da0f18007
4 changed files with 82 additions and 65 deletions
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@ -248,8 +248,8 @@ void perf_trace_del(struct perf_event *p_event, int flags)
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tp_event->class->reg(tp_event, TRACE_REG_PERF_DEL, p_event);
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}
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__kprobes void *perf_trace_buf_prepare(int size, unsigned short type,
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struct pt_regs *regs, int *rctxp)
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void *perf_trace_buf_prepare(int size, unsigned short type,
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struct pt_regs *regs, int *rctxp)
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{
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struct trace_entry *entry;
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unsigned long flags;
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@ -281,6 +281,7 @@ __kprobes void *perf_trace_buf_prepare(int size, unsigned short type,
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return raw_data;
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}
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EXPORT_SYMBOL_GPL(perf_trace_buf_prepare);
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NOKPROBE_SYMBOL(perf_trace_buf_prepare);
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#ifdef CONFIG_FUNCTION_TRACER
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static void
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@ -40,27 +40,27 @@ struct trace_kprobe {
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(sizeof(struct probe_arg) * (n)))
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static __kprobes bool trace_kprobe_is_return(struct trace_kprobe *tk)
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static nokprobe_inline bool trace_kprobe_is_return(struct trace_kprobe *tk)
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{
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return tk->rp.handler != NULL;
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}
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static __kprobes const char *trace_kprobe_symbol(struct trace_kprobe *tk)
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static nokprobe_inline const char *trace_kprobe_symbol(struct trace_kprobe *tk)
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{
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return tk->symbol ? tk->symbol : "unknown";
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}
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static __kprobes unsigned long trace_kprobe_offset(struct trace_kprobe *tk)
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static nokprobe_inline unsigned long trace_kprobe_offset(struct trace_kprobe *tk)
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{
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return tk->rp.kp.offset;
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}
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static __kprobes bool trace_kprobe_has_gone(struct trace_kprobe *tk)
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static nokprobe_inline bool trace_kprobe_has_gone(struct trace_kprobe *tk)
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{
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return !!(kprobe_gone(&tk->rp.kp));
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}
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static __kprobes bool trace_kprobe_within_module(struct trace_kprobe *tk,
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static nokprobe_inline bool trace_kprobe_within_module(struct trace_kprobe *tk,
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struct module *mod)
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{
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int len = strlen(mod->name);
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@ -68,7 +68,7 @@ static __kprobes bool trace_kprobe_within_module(struct trace_kprobe *tk,
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return strncmp(mod->name, name, len) == 0 && name[len] == ':';
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}
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static __kprobes bool trace_kprobe_is_on_module(struct trace_kprobe *tk)
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static nokprobe_inline bool trace_kprobe_is_on_module(struct trace_kprobe *tk)
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{
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return !!strchr(trace_kprobe_symbol(tk), ':');
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}
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@ -132,19 +132,21 @@ struct symbol_cache *alloc_symbol_cache(const char *sym, long offset)
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* Kprobes-specific fetch functions
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*/
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#define DEFINE_FETCH_stack(type) \
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static __kprobes void FETCH_FUNC_NAME(stack, type)(struct pt_regs *regs,\
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static void FETCH_FUNC_NAME(stack, type)(struct pt_regs *regs, \
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void *offset, void *dest) \
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{ \
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*(type *)dest = (type)regs_get_kernel_stack_nth(regs, \
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(unsigned int)((unsigned long)offset)); \
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}
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} \
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NOKPROBE_SYMBOL(FETCH_FUNC_NAME(stack, type));
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DEFINE_BASIC_FETCH_FUNCS(stack)
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/* No string on the stack entry */
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#define fetch_stack_string NULL
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#define fetch_stack_string_size NULL
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#define DEFINE_FETCH_memory(type) \
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static __kprobes void FETCH_FUNC_NAME(memory, type)(struct pt_regs *regs,\
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static void FETCH_FUNC_NAME(memory, type)(struct pt_regs *regs, \
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void *addr, void *dest) \
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{ \
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type retval; \
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@ -152,14 +154,16 @@ static __kprobes void FETCH_FUNC_NAME(memory, type)(struct pt_regs *regs,\
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*(type *)dest = 0; \
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else \
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*(type *)dest = retval; \
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}
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} \
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NOKPROBE_SYMBOL(FETCH_FUNC_NAME(memory, type));
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DEFINE_BASIC_FETCH_FUNCS(memory)
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/*
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* Fetch a null-terminated string. Caller MUST set *(u32 *)dest with max
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* length and relative data location.
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*/
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static __kprobes void FETCH_FUNC_NAME(memory, string)(struct pt_regs *regs,
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void *addr, void *dest)
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static void FETCH_FUNC_NAME(memory, string)(struct pt_regs *regs,
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void *addr, void *dest)
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{
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long ret;
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int maxlen = get_rloc_len(*(u32 *)dest);
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@ -193,10 +197,11 @@ static __kprobes void FETCH_FUNC_NAME(memory, string)(struct pt_regs *regs,
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get_rloc_offs(*(u32 *)dest));
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}
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}
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NOKPROBE_SYMBOL(FETCH_FUNC_NAME(memory, string));
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/* Return the length of string -- including null terminal byte */
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static __kprobes void FETCH_FUNC_NAME(memory, string_size)(struct pt_regs *regs,
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void *addr, void *dest)
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static void FETCH_FUNC_NAME(memory, string_size)(struct pt_regs *regs,
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void *addr, void *dest)
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{
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mm_segment_t old_fs;
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int ret, len = 0;
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@ -219,17 +224,19 @@ static __kprobes void FETCH_FUNC_NAME(memory, string_size)(struct pt_regs *regs,
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else
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*(u32 *)dest = len;
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}
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NOKPROBE_SYMBOL(FETCH_FUNC_NAME(memory, string_size));
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#define DEFINE_FETCH_symbol(type) \
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__kprobes void FETCH_FUNC_NAME(symbol, type)(struct pt_regs *regs, \
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void *data, void *dest) \
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void FETCH_FUNC_NAME(symbol, type)(struct pt_regs *regs, void *data, void *dest)\
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{ \
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struct symbol_cache *sc = data; \
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if (sc->addr) \
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fetch_memory_##type(regs, (void *)sc->addr, dest); \
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else \
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*(type *)dest = 0; \
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}
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} \
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NOKPROBE_SYMBOL(FETCH_FUNC_NAME(symbol, type));
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DEFINE_BASIC_FETCH_FUNCS(symbol)
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DEFINE_FETCH_symbol(string)
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DEFINE_FETCH_symbol(string_size)
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@ -907,7 +914,7 @@ static const struct file_operations kprobe_profile_ops = {
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};
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/* Kprobe handler */
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static __kprobes void
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static nokprobe_inline void
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__kprobe_trace_func(struct trace_kprobe *tk, struct pt_regs *regs,
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struct ftrace_event_file *ftrace_file)
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{
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@ -943,7 +950,7 @@ __kprobe_trace_func(struct trace_kprobe *tk, struct pt_regs *regs,
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entry, irq_flags, pc, regs);
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}
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static __kprobes void
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static void
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kprobe_trace_func(struct trace_kprobe *tk, struct pt_regs *regs)
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{
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struct event_file_link *link;
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@ -951,9 +958,10 @@ kprobe_trace_func(struct trace_kprobe *tk, struct pt_regs *regs)
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list_for_each_entry_rcu(link, &tk->tp.files, list)
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__kprobe_trace_func(tk, regs, link->file);
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}
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NOKPROBE_SYMBOL(kprobe_trace_func);
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/* Kretprobe handler */
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static __kprobes void
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static nokprobe_inline void
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__kretprobe_trace_func(struct trace_kprobe *tk, struct kretprobe_instance *ri,
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struct pt_regs *regs,
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struct ftrace_event_file *ftrace_file)
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@ -991,7 +999,7 @@ __kretprobe_trace_func(struct trace_kprobe *tk, struct kretprobe_instance *ri,
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entry, irq_flags, pc, regs);
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}
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static __kprobes void
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static void
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kretprobe_trace_func(struct trace_kprobe *tk, struct kretprobe_instance *ri,
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struct pt_regs *regs)
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{
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@ -1000,6 +1008,7 @@ kretprobe_trace_func(struct trace_kprobe *tk, struct kretprobe_instance *ri,
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list_for_each_entry_rcu(link, &tk->tp.files, list)
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__kretprobe_trace_func(tk, ri, regs, link->file);
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}
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NOKPROBE_SYMBOL(kretprobe_trace_func);
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/* Event entry printers */
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static enum print_line_t
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@ -1131,7 +1140,7 @@ static int kretprobe_event_define_fields(struct ftrace_event_call *event_call)
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#ifdef CONFIG_PERF_EVENTS
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/* Kprobe profile handler */
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static __kprobes void
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static void
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kprobe_perf_func(struct trace_kprobe *tk, struct pt_regs *regs)
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{
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struct ftrace_event_call *call = &tk->tp.call;
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@ -1158,9 +1167,10 @@ kprobe_perf_func(struct trace_kprobe *tk, struct pt_regs *regs)
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store_trace_args(sizeof(*entry), &tk->tp, regs, (u8 *)&entry[1], dsize);
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perf_trace_buf_submit(entry, size, rctx, 0, 1, regs, head, NULL);
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}
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NOKPROBE_SYMBOL(kprobe_perf_func);
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/* Kretprobe profile handler */
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static __kprobes void
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static void
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kretprobe_perf_func(struct trace_kprobe *tk, struct kretprobe_instance *ri,
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struct pt_regs *regs)
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{
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@ -1188,6 +1198,7 @@ kretprobe_perf_func(struct trace_kprobe *tk, struct kretprobe_instance *ri,
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store_trace_args(sizeof(*entry), &tk->tp, regs, (u8 *)&entry[1], dsize);
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perf_trace_buf_submit(entry, size, rctx, 0, 1, regs, head, NULL);
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}
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NOKPROBE_SYMBOL(kretprobe_perf_func);
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#endif /* CONFIG_PERF_EVENTS */
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/*
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@ -1223,8 +1234,7 @@ static int kprobe_register(struct ftrace_event_call *event,
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return 0;
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}
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static __kprobes
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int kprobe_dispatcher(struct kprobe *kp, struct pt_regs *regs)
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static int kprobe_dispatcher(struct kprobe *kp, struct pt_regs *regs)
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{
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struct trace_kprobe *tk = container_of(kp, struct trace_kprobe, rp.kp);
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@ -1238,9 +1248,10 @@ int kprobe_dispatcher(struct kprobe *kp, struct pt_regs *regs)
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#endif
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return 0; /* We don't tweek kernel, so just return 0 */
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}
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NOKPROBE_SYMBOL(kprobe_dispatcher);
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static __kprobes
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int kretprobe_dispatcher(struct kretprobe_instance *ri, struct pt_regs *regs)
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static int
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kretprobe_dispatcher(struct kretprobe_instance *ri, struct pt_regs *regs)
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{
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struct trace_kprobe *tk = container_of(ri->rp, struct trace_kprobe, rp);
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@ -1254,6 +1265,7 @@ int kretprobe_dispatcher(struct kretprobe_instance *ri, struct pt_regs *regs)
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#endif
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return 0; /* We don't tweek kernel, so just return 0 */
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}
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NOKPROBE_SYMBOL(kretprobe_dispatcher);
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static struct trace_event_functions kretprobe_funcs = {
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.trace = print_kretprobe_event
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@ -37,13 +37,13 @@ const char *reserved_field_names[] = {
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/* Printing in basic type function template */
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#define DEFINE_BASIC_PRINT_TYPE_FUNC(type, fmt) \
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__kprobes int PRINT_TYPE_FUNC_NAME(type)(struct trace_seq *s, \
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const char *name, \
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void *data, void *ent) \
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int PRINT_TYPE_FUNC_NAME(type)(struct trace_seq *s, const char *name, \
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void *data, void *ent) \
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{ \
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return trace_seq_printf(s, " %s=" fmt, name, *(type *)data); \
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} \
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const char PRINT_TYPE_FMT_NAME(type)[] = fmt;
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const char PRINT_TYPE_FMT_NAME(type)[] = fmt; \
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NOKPROBE_SYMBOL(PRINT_TYPE_FUNC_NAME(type));
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DEFINE_BASIC_PRINT_TYPE_FUNC(u8 , "0x%x")
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DEFINE_BASIC_PRINT_TYPE_FUNC(u16, "0x%x")
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@ -55,9 +55,8 @@ DEFINE_BASIC_PRINT_TYPE_FUNC(s32, "%d")
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DEFINE_BASIC_PRINT_TYPE_FUNC(s64, "%Ld")
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/* Print type function for string type */
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__kprobes int PRINT_TYPE_FUNC_NAME(string)(struct trace_seq *s,
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const char *name,
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void *data, void *ent)
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int PRINT_TYPE_FUNC_NAME(string)(struct trace_seq *s, const char *name,
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void *data, void *ent)
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{
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int len = *(u32 *)data >> 16;
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@ -67,6 +66,7 @@ __kprobes int PRINT_TYPE_FUNC_NAME(string)(struct trace_seq *s,
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return trace_seq_printf(s, " %s=\"%s\"", name,
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(const char *)get_loc_data(data, ent));
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}
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NOKPROBE_SYMBOL(PRINT_TYPE_FUNC_NAME(string));
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const char PRINT_TYPE_FMT_NAME(string)[] = "\\\"%s\\\"";
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@ -81,23 +81,24 @@ const char PRINT_TYPE_FMT_NAME(string)[] = "\\\"%s\\\"";
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/* Data fetch function templates */
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#define DEFINE_FETCH_reg(type) \
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__kprobes void FETCH_FUNC_NAME(reg, type)(struct pt_regs *regs, \
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void *offset, void *dest) \
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void FETCH_FUNC_NAME(reg, type)(struct pt_regs *regs, void *offset, void *dest) \
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{ \
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*(type *)dest = (type)regs_get_register(regs, \
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(unsigned int)((unsigned long)offset)); \
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}
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} \
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NOKPROBE_SYMBOL(FETCH_FUNC_NAME(reg, type));
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DEFINE_BASIC_FETCH_FUNCS(reg)
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/* No string on the register */
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#define fetch_reg_string NULL
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#define fetch_reg_string_size NULL
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#define DEFINE_FETCH_retval(type) \
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__kprobes void FETCH_FUNC_NAME(retval, type)(struct pt_regs *regs, \
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void *dummy, void *dest) \
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void FETCH_FUNC_NAME(retval, type)(struct pt_regs *regs, \
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void *dummy, void *dest) \
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{ \
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*(type *)dest = (type)regs_return_value(regs); \
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}
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} \
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NOKPROBE_SYMBOL(FETCH_FUNC_NAME(retval, type));
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DEFINE_BASIC_FETCH_FUNCS(retval)
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/* No string on the retval */
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#define fetch_retval_string NULL
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@ -112,8 +113,8 @@ struct deref_fetch_param {
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};
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#define DEFINE_FETCH_deref(type) \
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__kprobes void FETCH_FUNC_NAME(deref, type)(struct pt_regs *regs, \
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void *data, void *dest) \
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void FETCH_FUNC_NAME(deref, type)(struct pt_regs *regs, \
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void *data, void *dest) \
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{ \
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struct deref_fetch_param *dprm = data; \
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unsigned long addr; \
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@ -123,12 +124,13 @@ __kprobes void FETCH_FUNC_NAME(deref, type)(struct pt_regs *regs, \
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dprm->fetch(regs, (void *)addr, dest); \
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} else \
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*(type *)dest = 0; \
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}
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} \
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NOKPROBE_SYMBOL(FETCH_FUNC_NAME(deref, type));
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DEFINE_BASIC_FETCH_FUNCS(deref)
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DEFINE_FETCH_deref(string)
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__kprobes void FETCH_FUNC_NAME(deref, string_size)(struct pt_regs *regs,
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void *data, void *dest)
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void FETCH_FUNC_NAME(deref, string_size)(struct pt_regs *regs,
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void *data, void *dest)
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{
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struct deref_fetch_param *dprm = data;
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unsigned long addr;
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@ -140,16 +142,18 @@ __kprobes void FETCH_FUNC_NAME(deref, string_size)(struct pt_regs *regs,
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} else
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*(string_size *)dest = 0;
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}
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NOKPROBE_SYMBOL(FETCH_FUNC_NAME(deref, string_size));
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static __kprobes void update_deref_fetch_param(struct deref_fetch_param *data)
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static void update_deref_fetch_param(struct deref_fetch_param *data)
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{
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if (CHECK_FETCH_FUNCS(deref, data->orig.fn))
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update_deref_fetch_param(data->orig.data);
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else if (CHECK_FETCH_FUNCS(symbol, data->orig.fn))
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update_symbol_cache(data->orig.data);
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}
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NOKPROBE_SYMBOL(update_deref_fetch_param);
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static __kprobes void free_deref_fetch_param(struct deref_fetch_param *data)
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static void free_deref_fetch_param(struct deref_fetch_param *data)
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{
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if (CHECK_FETCH_FUNCS(deref, data->orig.fn))
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free_deref_fetch_param(data->orig.data);
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@ -157,6 +161,7 @@ static __kprobes void free_deref_fetch_param(struct deref_fetch_param *data)
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free_symbol_cache(data->orig.data);
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kfree(data);
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}
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NOKPROBE_SYMBOL(free_deref_fetch_param);
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/* Bitfield fetch function */
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struct bitfield_fetch_param {
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@ -166,8 +171,8 @@ struct bitfield_fetch_param {
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};
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#define DEFINE_FETCH_bitfield(type) \
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__kprobes void FETCH_FUNC_NAME(bitfield, type)(struct pt_regs *regs, \
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void *data, void *dest) \
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void FETCH_FUNC_NAME(bitfield, type)(struct pt_regs *regs, \
|
||||
void *data, void *dest) \
|
||||
{ \
|
||||
struct bitfield_fetch_param *bprm = data; \
|
||||
type buf = 0; \
|
||||
|
|
@ -177,8 +182,8 @@ __kprobes void FETCH_FUNC_NAME(bitfield, type)(struct pt_regs *regs, \
|
|||
buf >>= bprm->low_shift; \
|
||||
} \
|
||||
*(type *)dest = buf; \
|
||||
}
|
||||
|
||||
} \
|
||||
NOKPROBE_SYMBOL(FETCH_FUNC_NAME(bitfield, type));
|
||||
DEFINE_BASIC_FETCH_FUNCS(bitfield)
|
||||
#define fetch_bitfield_string NULL
|
||||
#define fetch_bitfield_string_size NULL
|
||||
|
|
@ -255,17 +260,17 @@ static const struct fetch_type *find_fetch_type(const char *type,
|
|||
}
|
||||
|
||||
/* Special function : only accept unsigned long */
|
||||
static __kprobes void fetch_kernel_stack_address(struct pt_regs *regs,
|
||||
void *dummy, void *dest)
|
||||
static void fetch_kernel_stack_address(struct pt_regs *regs, void *dummy, void *dest)
|
||||
{
|
||||
*(unsigned long *)dest = kernel_stack_pointer(regs);
|
||||
}
|
||||
NOKPROBE_SYMBOL(fetch_kernel_stack_address);
|
||||
|
||||
static __kprobes void fetch_user_stack_address(struct pt_regs *regs,
|
||||
void *dummy, void *dest)
|
||||
static void fetch_user_stack_address(struct pt_regs *regs, void *dummy, void *dest)
|
||||
{
|
||||
*(unsigned long *)dest = user_stack_pointer(regs);
|
||||
}
|
||||
NOKPROBE_SYMBOL(fetch_user_stack_address);
|
||||
|
||||
static fetch_func_t get_fetch_size_function(const struct fetch_type *type,
|
||||
fetch_func_t orig_fn,
|
||||
|
|
|
|||
|
|
@ -81,13 +81,13 @@
|
|||
*/
|
||||
#define convert_rloc_to_loc(dl, offs) ((u32)(dl) + (offs))
|
||||
|
||||
static inline void *get_rloc_data(u32 *dl)
|
||||
static nokprobe_inline void *get_rloc_data(u32 *dl)
|
||||
{
|
||||
return (u8 *)dl + get_rloc_offs(*dl);
|
||||
}
|
||||
|
||||
/* For data_loc conversion */
|
||||
static inline void *get_loc_data(u32 *dl, void *ent)
|
||||
static nokprobe_inline void *get_loc_data(u32 *dl, void *ent)
|
||||
{
|
||||
return (u8 *)ent + get_rloc_offs(*dl);
|
||||
}
|
||||
|
|
@ -136,9 +136,8 @@ typedef u32 string_size;
|
|||
|
||||
/* Printing in basic type function template */
|
||||
#define DECLARE_BASIC_PRINT_TYPE_FUNC(type) \
|
||||
__kprobes int PRINT_TYPE_FUNC_NAME(type)(struct trace_seq *s, \
|
||||
const char *name, \
|
||||
void *data, void *ent); \
|
||||
int PRINT_TYPE_FUNC_NAME(type)(struct trace_seq *s, const char *name, \
|
||||
void *data, void *ent); \
|
||||
extern const char PRINT_TYPE_FMT_NAME(type)[]
|
||||
|
||||
DECLARE_BASIC_PRINT_TYPE_FUNC(u8);
|
||||
|
|
@ -303,7 +302,7 @@ static inline bool trace_probe_is_registered(struct trace_probe *tp)
|
|||
return !!(tp->flags & TP_FLAG_REGISTERED);
|
||||
}
|
||||
|
||||
static inline __kprobes void call_fetch(struct fetch_param *fprm,
|
||||
static nokprobe_inline void call_fetch(struct fetch_param *fprm,
|
||||
struct pt_regs *regs, void *dest)
|
||||
{
|
||||
return fprm->fn(regs, fprm->data, dest);
|
||||
|
|
@ -351,7 +350,7 @@ extern ssize_t traceprobe_probes_write(struct file *file,
|
|||
extern int traceprobe_command(const char *buf, int (*createfn)(int, char**));
|
||||
|
||||
/* Sum up total data length for dynamic arraies (strings) */
|
||||
static inline __kprobes int
|
||||
static nokprobe_inline int
|
||||
__get_data_size(struct trace_probe *tp, struct pt_regs *regs)
|
||||
{
|
||||
int i, ret = 0;
|
||||
|
|
@ -367,7 +366,7 @@ __get_data_size(struct trace_probe *tp, struct pt_regs *regs)
|
|||
}
|
||||
|
||||
/* Store the value of each argument */
|
||||
static inline __kprobes void
|
||||
static nokprobe_inline void
|
||||
store_trace_args(int ent_size, struct trace_probe *tp, struct pt_regs *regs,
|
||||
u8 *data, int maxlen)
|
||||
{
|
||||
|
|
|
|||
Loading…
Reference in a new issue