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kprobes, ftrace: Use NOKPROBE_SYMBOL macro in ftrace

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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
2014-04-17 17:18:28 +09:00
committed by Ingo Molnar
parent 820aede020
commit 3da0f18007
4 changed files with 82 additions and 65 deletions
Download Patch File Download Diff File Expand all files Collapse all files
kernel/trace/trace_probe.c
+33 -28
View File
@@ -37,13 +37,13 @@ const char *reserved_field_names[] = {
/* Printing in basic type function template */
#define DEFINE_BASIC_PRINT_TYPE_FUNC(type, fmt) \
__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) \
{ \
return trace_seq_printf(s, " %s=" fmt, name, *(type *)data); \
} \
const char PRINT_TYPE_FMT_NAME(type)[] = fmt;
const char PRINT_TYPE_FMT_NAME(type)[] = fmt; \
NOKPROBE_SYMBOL(PRINT_TYPE_FUNC_NAME(type));
DEFINE_BASIC_PRINT_TYPE_FUNC(u8 , "0x%x")
DEFINE_BASIC_PRINT_TYPE_FUNC(u16, "0x%x")
@@ -55,9 +55,8 @@ DEFINE_BASIC_PRINT_TYPE_FUNC(s32, "%d")
DEFINE_BASIC_PRINT_TYPE_FUNC(s64, "%Ld")
/* Print type function for string type */
__kprobes int PRINT_TYPE_FUNC_NAME(string)(struct trace_seq *s,
const char *name,
void *data, void *ent)
int PRINT_TYPE_FUNC_NAME(string)(struct trace_seq *s, const char *name,
void *data, void *ent)
{
int len = *(u32 *)data >> 16;
@@ -67,6 +66,7 @@ __kprobes int PRINT_TYPE_FUNC_NAME(string)(struct trace_seq *s,
return trace_seq_printf(s, " %s=\"%s\"", name,
(const char *)get_loc_data(data, ent));
}
NOKPROBE_SYMBOL(PRINT_TYPE_FUNC_NAME(string));
const char PRINT_TYPE_FMT_NAME(string)[] = "\\\"%s\\\"";
@@ -81,23 +81,24 @@ const char PRINT_TYPE_FMT_NAME(string)[] = "\\\"%s\\\"";
/* Data fetch function templates */
#define DEFINE_FETCH_reg(type) \
__kprobes void FETCH_FUNC_NAME(reg, type)(struct pt_regs *regs, \
void *offset, void *dest) \
void FETCH_FUNC_NAME(reg, type)(struct pt_regs *regs, void *offset, void *dest) \
{ \
*(type *)dest = (type)regs_get_register(regs, \
(unsigned int)((unsigned long)offset)); \
}
} \
NOKPROBE_SYMBOL(FETCH_FUNC_NAME(reg, type));
DEFINE_BASIC_FETCH_FUNCS(reg)
/* No string on the register */
#define fetch_reg_string NULL
#define fetch_reg_string_size NULL
#define DEFINE_FETCH_retval(type) \
__kprobes void FETCH_FUNC_NAME(retval, type)(struct pt_regs *regs, \
void *dummy, void *dest) \
void FETCH_FUNC_NAME(retval, type)(struct pt_regs *regs, \
void *dummy, void *dest) \
{ \
*(type *)dest = (type)regs_return_value(regs); \
}
} \
NOKPROBE_SYMBOL(FETCH_FUNC_NAME(retval, type));
DEFINE_BASIC_FETCH_FUNCS(retval)
/* No string on the retval */
#define fetch_retval_string NULL
@@ -112,8 +113,8 @@ struct deref_fetch_param {
};
#define DEFINE_FETCH_deref(type) \
__kprobes void FETCH_FUNC_NAME(deref, type)(struct pt_regs *regs, \
void *data, void *dest) \
void FETCH_FUNC_NAME(deref, type)(struct pt_regs *regs, \
void *data, void *dest) \
{ \
struct deref_fetch_param *dprm = data; \
unsigned long addr; \
@@ -123,12 +124,13 @@ __kprobes void FETCH_FUNC_NAME(deref, type)(struct pt_regs *regs, \
dprm->fetch(regs, (void *)addr, dest); \
} else \
*(type *)dest = 0; \
}
} \
NOKPROBE_SYMBOL(FETCH_FUNC_NAME(deref, type));
DEFINE_BASIC_FETCH_FUNCS(deref)
DEFINE_FETCH_deref(string)
__kprobes void FETCH_FUNC_NAME(deref, string_size)(struct pt_regs *regs,
void *data, void *dest)
void FETCH_FUNC_NAME(deref, string_size)(struct pt_regs *regs,
void *data, void *dest)
{
struct deref_fetch_param *dprm = data;
unsigned long addr;
@@ -140,16 +142,18 @@ __kprobes void FETCH_FUNC_NAME(deref, string_size)(struct pt_regs *regs,
} else
*(string_size *)dest = 0;
}
NOKPROBE_SYMBOL(FETCH_FUNC_NAME(deref, string_size));
static __kprobes void update_deref_fetch_param(struct deref_fetch_param *data)
static void update_deref_fetch_param(struct deref_fetch_param *data)
{
if (CHECK_FETCH_FUNCS(deref, data->orig.fn))
update_deref_fetch_param(data->orig.data);
else if (CHECK_FETCH_FUNCS(symbol, data->orig.fn))
update_symbol_cache(data->orig.data);
}
NOKPROBE_SYMBOL(update_deref_fetch_param);
static __kprobes void free_deref_fetch_param(struct deref_fetch_param *data)
static void free_deref_fetch_param(struct deref_fetch_param *data)
{
if (CHECK_FETCH_FUNCS(deref, data->orig.fn))
free_deref_fetch_param(data->orig.data);
@@ -157,6 +161,7 @@ static __kprobes void free_deref_fetch_param(struct deref_fetch_param *data)
free_symbol_cache(data->orig.data);
kfree(data);
}
NOKPROBE_SYMBOL(free_deref_fetch_param);
/* Bitfield fetch function */
struct bitfield_fetch_param {
@@ -166,8 +171,8 @@ struct bitfield_fetch_param {
};
#define DEFINE_FETCH_bitfield(type) \
__kprobes void FETCH_FUNC_NAME(bitfield, type)(struct pt_regs *regs, \
void *data, void *dest) \
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 @@ fail:
}
/* 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,