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![Namhyung Kim](/assets/img/avatar_default.png)
Enable to fetch data from a file offset. Currently it only supports fetching from same binary uprobe set. It'll translate the file offset to a proper virtual address in the process. The syntax is "@+OFFSET" as it does similar to normal memory fetching (@ADDR) which does no address translation. Suggested-by: Oleg Nesterov <oleg@redhat.com> Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Acked-by: Oleg Nesterov <oleg@redhat.com> Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com> Cc: zhangwei(Jovi) <jovi.zhangwei@huawei.com> Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net> Signed-off-by: Namhyung Kim <namhyung@kernel.org>
721 lines
17 KiB
C
721 lines
17 KiB
C
/*
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* Common code for probe-based Dynamic events.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* This code was copied from kernel/trace/trace_kprobe.c written by
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* Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
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*
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* Updates to make this generic:
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* Copyright (C) IBM Corporation, 2010-2011
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* Author: Srikar Dronamraju
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*/
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#include "trace_probe.h"
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const char *reserved_field_names[] = {
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"common_type",
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"common_flags",
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"common_preempt_count",
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"common_pid",
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"common_tgid",
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FIELD_STRING_IP,
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FIELD_STRING_RETIP,
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FIELD_STRING_FUNC,
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};
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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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{ \
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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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DEFINE_BASIC_PRINT_TYPE_FUNC(u8 , "0x%x")
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DEFINE_BASIC_PRINT_TYPE_FUNC(u16, "0x%x")
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DEFINE_BASIC_PRINT_TYPE_FUNC(u32, "0x%x")
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DEFINE_BASIC_PRINT_TYPE_FUNC(u64, "0x%Lx")
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DEFINE_BASIC_PRINT_TYPE_FUNC(s8, "%d")
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DEFINE_BASIC_PRINT_TYPE_FUNC(s16, "%d")
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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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{
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int len = *(u32 *)data >> 16;
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if (!len)
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return trace_seq_printf(s, " %s=(fault)", name);
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else
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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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const char PRINT_TYPE_FMT_NAME(string)[] = "\\\"%s\\\"";
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#define CHECK_FETCH_FUNCS(method, fn) \
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(((FETCH_FUNC_NAME(method, u8) == fn) || \
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(FETCH_FUNC_NAME(method, u16) == fn) || \
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(FETCH_FUNC_NAME(method, u32) == fn) || \
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(FETCH_FUNC_NAME(method, u64) == fn) || \
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(FETCH_FUNC_NAME(method, string) == fn) || \
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(FETCH_FUNC_NAME(method, string_size) == fn)) \
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&& (fn != NULL))
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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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{ \
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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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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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{ \
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*(type *)dest = (type)regs_return_value(regs); \
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}
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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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#define fetch_retval_string_size NULL
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/* Dereference memory access function */
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struct deref_fetch_param {
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struct fetch_param orig;
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long offset;
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fetch_func_t fetch;
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fetch_func_t fetch_size;
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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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{ \
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struct deref_fetch_param *dprm = data; \
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unsigned long addr; \
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call_fetch(&dprm->orig, regs, &addr); \
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if (addr) { \
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addr += dprm->offset; \
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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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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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{
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struct deref_fetch_param *dprm = data;
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unsigned long addr;
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call_fetch(&dprm->orig, regs, &addr);
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if (addr && dprm->fetch_size) {
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addr += dprm->offset;
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dprm->fetch_size(regs, (void *)addr, dest);
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} else
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*(string_size *)dest = 0;
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}
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static __kprobes 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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static __kprobes 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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else if (CHECK_FETCH_FUNCS(symbol, data->orig.fn))
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free_symbol_cache(data->orig.data);
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kfree(data);
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}
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/* Bitfield fetch function */
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struct bitfield_fetch_param {
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struct fetch_param orig;
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unsigned char hi_shift;
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unsigned char low_shift;
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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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{ \
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struct bitfield_fetch_param *bprm = data; \
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type buf = 0; \
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call_fetch(&bprm->orig, regs, &buf); \
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if (buf) { \
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buf <<= bprm->hi_shift; \
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buf >>= bprm->low_shift; \
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} \
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*(type *)dest = buf; \
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}
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DEFINE_BASIC_FETCH_FUNCS(bitfield)
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#define fetch_bitfield_string NULL
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#define fetch_bitfield_string_size NULL
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static __kprobes void
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update_bitfield_fetch_param(struct bitfield_fetch_param *data)
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{
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/*
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* Don't check the bitfield itself, because this must be the
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* last fetch function.
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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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static __kprobes void
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free_bitfield_fetch_param(struct bitfield_fetch_param *data)
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{
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/*
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* Don't check the bitfield itself, because this must be the
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* last fetch function.
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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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else if (CHECK_FETCH_FUNCS(symbol, data->orig.fn))
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free_symbol_cache(data->orig.data);
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kfree(data);
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}
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static const struct fetch_type *find_fetch_type(const char *type,
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const struct fetch_type *ftbl)
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{
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int i;
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if (!type)
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type = DEFAULT_FETCH_TYPE_STR;
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/* Special case: bitfield */
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if (*type == 'b') {
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unsigned long bs;
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type = strchr(type, '/');
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if (!type)
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goto fail;
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type++;
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if (kstrtoul(type, 0, &bs))
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goto fail;
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switch (bs) {
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case 8:
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return find_fetch_type("u8", ftbl);
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case 16:
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return find_fetch_type("u16", ftbl);
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case 32:
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return find_fetch_type("u32", ftbl);
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case 64:
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return find_fetch_type("u64", ftbl);
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default:
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goto fail;
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}
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}
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for (i = 0; ftbl[i].name; i++) {
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if (strcmp(type, ftbl[i].name) == 0)
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return &ftbl[i];
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}
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fail:
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return NULL;
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}
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/* Special function : only accept unsigned long */
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static __kprobes void fetch_kernel_stack_address(struct pt_regs *regs,
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void *dummy, void *dest)
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{
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*(unsigned long *)dest = kernel_stack_pointer(regs);
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}
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static __kprobes void fetch_user_stack_address(struct pt_regs *regs,
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void *dummy, void *dest)
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{
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*(unsigned long *)dest = user_stack_pointer(regs);
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}
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static fetch_func_t get_fetch_size_function(const struct fetch_type *type,
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fetch_func_t orig_fn,
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const struct fetch_type *ftbl)
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{
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int i;
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if (type != &ftbl[FETCH_TYPE_STRING])
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return NULL; /* Only string type needs size function */
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for (i = 0; i < FETCH_MTD_END; i++)
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if (type->fetch[i] == orig_fn)
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return ftbl[FETCH_TYPE_STRSIZE].fetch[i];
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WARN_ON(1); /* This should not happen */
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return NULL;
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}
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/* Split symbol and offset. */
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int traceprobe_split_symbol_offset(char *symbol, unsigned long *offset)
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{
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char *tmp;
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int ret;
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if (!offset)
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return -EINVAL;
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tmp = strchr(symbol, '+');
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if (tmp) {
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/* skip sign because kstrtoul doesn't accept '+' */
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ret = kstrtoul(tmp + 1, 0, offset);
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if (ret)
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return ret;
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*tmp = '\0';
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} else
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*offset = 0;
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return 0;
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}
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#define PARAM_MAX_STACK (THREAD_SIZE / sizeof(unsigned long))
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static int parse_probe_vars(char *arg, const struct fetch_type *t,
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struct fetch_param *f, bool is_return,
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bool is_kprobe)
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{
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int ret = 0;
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unsigned long param;
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if (strcmp(arg, "retval") == 0) {
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if (is_return)
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f->fn = t->fetch[FETCH_MTD_retval];
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else
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ret = -EINVAL;
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} else if (strncmp(arg, "stack", 5) == 0) {
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if (arg[5] == '\0') {
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if (strcmp(t->name, DEFAULT_FETCH_TYPE_STR))
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return -EINVAL;
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if (is_kprobe)
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f->fn = fetch_kernel_stack_address;
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else
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f->fn = fetch_user_stack_address;
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} else if (isdigit(arg[5])) {
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ret = kstrtoul(arg + 5, 10, ¶m);
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if (ret || (is_kprobe && param > PARAM_MAX_STACK))
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ret = -EINVAL;
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else {
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f->fn = t->fetch[FETCH_MTD_stack];
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f->data = (void *)param;
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}
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} else
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ret = -EINVAL;
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} else
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ret = -EINVAL;
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return ret;
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}
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/* Recursive argument parser */
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static int parse_probe_arg(char *arg, const struct fetch_type *t,
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struct fetch_param *f, bool is_return, bool is_kprobe)
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{
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const struct fetch_type *ftbl;
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unsigned long param;
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long offset;
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char *tmp;
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int ret = 0;
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ftbl = is_kprobe ? kprobes_fetch_type_table : uprobes_fetch_type_table;
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BUG_ON(ftbl == NULL);
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switch (arg[0]) {
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case '$':
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ret = parse_probe_vars(arg + 1, t, f, is_return, is_kprobe);
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break;
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case '%': /* named register */
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ret = regs_query_register_offset(arg + 1);
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if (ret >= 0) {
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f->fn = t->fetch[FETCH_MTD_reg];
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f->data = (void *)(unsigned long)ret;
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ret = 0;
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}
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break;
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case '@': /* memory, file-offset or symbol */
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if (isdigit(arg[1])) {
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ret = kstrtoul(arg + 1, 0, ¶m);
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if (ret)
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break;
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f->fn = t->fetch[FETCH_MTD_memory];
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f->data = (void *)param;
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} else if (arg[1] == '+') {
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/* kprobes don't support file offsets */
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if (is_kprobe)
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return -EINVAL;
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ret = kstrtol(arg + 2, 0, &offset);
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if (ret)
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break;
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f->fn = t->fetch[FETCH_MTD_file_offset];
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f->data = (void *)offset;
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} else {
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/* uprobes don't support symbols */
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if (!is_kprobe)
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return -EINVAL;
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ret = traceprobe_split_symbol_offset(arg + 1, &offset);
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if (ret)
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break;
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f->data = alloc_symbol_cache(arg + 1, offset);
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if (f->data)
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f->fn = t->fetch[FETCH_MTD_symbol];
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}
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break;
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case '+': /* deref memory */
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arg++; /* Skip '+', because kstrtol() rejects it. */
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case '-':
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tmp = strchr(arg, '(');
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if (!tmp)
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break;
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*tmp = '\0';
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ret = kstrtol(arg, 0, &offset);
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if (ret)
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break;
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arg = tmp + 1;
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tmp = strrchr(arg, ')');
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if (tmp) {
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struct deref_fetch_param *dprm;
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const struct fetch_type *t2;
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t2 = find_fetch_type(NULL, ftbl);
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*tmp = '\0';
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dprm = kzalloc(sizeof(struct deref_fetch_param), GFP_KERNEL);
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if (!dprm)
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return -ENOMEM;
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dprm->offset = offset;
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dprm->fetch = t->fetch[FETCH_MTD_memory];
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dprm->fetch_size = get_fetch_size_function(t,
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dprm->fetch, ftbl);
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ret = parse_probe_arg(arg, t2, &dprm->orig, is_return,
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is_kprobe);
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if (ret)
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kfree(dprm);
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else {
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f->fn = t->fetch[FETCH_MTD_deref];
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f->data = (void *)dprm;
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}
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}
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break;
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}
|
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if (!ret && !f->fn) { /* Parsed, but do not find fetch method */
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pr_info("%s type has no corresponding fetch method.\n", t->name);
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ret = -EINVAL;
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}
|
|
|
|
return ret;
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}
|
|
|
|
#define BYTES_TO_BITS(nb) ((BITS_PER_LONG * (nb)) / sizeof(long))
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|
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/* Bitfield type needs to be parsed into a fetch function */
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static int __parse_bitfield_probe_arg(const char *bf,
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const struct fetch_type *t,
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struct fetch_param *f)
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{
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struct bitfield_fetch_param *bprm;
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unsigned long bw, bo;
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char *tail;
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|
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if (*bf != 'b')
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return 0;
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|
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bprm = kzalloc(sizeof(*bprm), GFP_KERNEL);
|
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if (!bprm)
|
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return -ENOMEM;
|
|
|
|
bprm->orig = *f;
|
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f->fn = t->fetch[FETCH_MTD_bitfield];
|
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f->data = (void *)bprm;
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|
bw = simple_strtoul(bf + 1, &tail, 0); /* Use simple one */
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|
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if (bw == 0 || *tail != '@')
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return -EINVAL;
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bf = tail + 1;
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bo = simple_strtoul(bf, &tail, 0);
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|
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if (tail == bf || *tail != '/')
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return -EINVAL;
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bprm->hi_shift = BYTES_TO_BITS(t->size) - (bw + bo);
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bprm->low_shift = bprm->hi_shift + bo;
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return (BYTES_TO_BITS(t->size) < (bw + bo)) ? -EINVAL : 0;
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}
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|
|
/* String length checking wrapper */
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|
int traceprobe_parse_probe_arg(char *arg, ssize_t *size,
|
|
struct probe_arg *parg, bool is_return, bool is_kprobe)
|
|
{
|
|
const struct fetch_type *ftbl;
|
|
const char *t;
|
|
int ret;
|
|
|
|
ftbl = is_kprobe ? kprobes_fetch_type_table : uprobes_fetch_type_table;
|
|
BUG_ON(ftbl == NULL);
|
|
|
|
if (strlen(arg) > MAX_ARGSTR_LEN) {
|
|
pr_info("Argument is too long.: %s\n", arg);
|
|
return -ENOSPC;
|
|
}
|
|
parg->comm = kstrdup(arg, GFP_KERNEL);
|
|
if (!parg->comm) {
|
|
pr_info("Failed to allocate memory for command '%s'.\n", arg);
|
|
return -ENOMEM;
|
|
}
|
|
t = strchr(parg->comm, ':');
|
|
if (t) {
|
|
arg[t - parg->comm] = '\0';
|
|
t++;
|
|
}
|
|
parg->type = find_fetch_type(t, ftbl);
|
|
if (!parg->type) {
|
|
pr_info("Unsupported type: %s\n", t);
|
|
return -EINVAL;
|
|
}
|
|
parg->offset = *size;
|
|
*size += parg->type->size;
|
|
ret = parse_probe_arg(arg, parg->type, &parg->fetch, is_return, is_kprobe);
|
|
|
|
if (ret >= 0 && t != NULL)
|
|
ret = __parse_bitfield_probe_arg(t, parg->type, &parg->fetch);
|
|
|
|
if (ret >= 0) {
|
|
parg->fetch_size.fn = get_fetch_size_function(parg->type,
|
|
parg->fetch.fn,
|
|
ftbl);
|
|
parg->fetch_size.data = parg->fetch.data;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* Return 1 if name is reserved or already used by another argument */
|
|
int traceprobe_conflict_field_name(const char *name,
|
|
struct probe_arg *args, int narg)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(reserved_field_names); i++)
|
|
if (strcmp(reserved_field_names[i], name) == 0)
|
|
return 1;
|
|
|
|
for (i = 0; i < narg; i++)
|
|
if (strcmp(args[i].name, name) == 0)
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
void traceprobe_update_arg(struct probe_arg *arg)
|
|
{
|
|
if (CHECK_FETCH_FUNCS(bitfield, arg->fetch.fn))
|
|
update_bitfield_fetch_param(arg->fetch.data);
|
|
else if (CHECK_FETCH_FUNCS(deref, arg->fetch.fn))
|
|
update_deref_fetch_param(arg->fetch.data);
|
|
else if (CHECK_FETCH_FUNCS(symbol, arg->fetch.fn))
|
|
update_symbol_cache(arg->fetch.data);
|
|
}
|
|
|
|
void traceprobe_free_probe_arg(struct probe_arg *arg)
|
|
{
|
|
if (CHECK_FETCH_FUNCS(bitfield, arg->fetch.fn))
|
|
free_bitfield_fetch_param(arg->fetch.data);
|
|
else if (CHECK_FETCH_FUNCS(deref, arg->fetch.fn))
|
|
free_deref_fetch_param(arg->fetch.data);
|
|
else if (CHECK_FETCH_FUNCS(symbol, arg->fetch.fn))
|
|
free_symbol_cache(arg->fetch.data);
|
|
|
|
kfree(arg->name);
|
|
kfree(arg->comm);
|
|
}
|
|
|
|
int traceprobe_command(const char *buf, int (*createfn)(int, char **))
|
|
{
|
|
char **argv;
|
|
int argc, ret;
|
|
|
|
argc = 0;
|
|
ret = 0;
|
|
argv = argv_split(GFP_KERNEL, buf, &argc);
|
|
if (!argv)
|
|
return -ENOMEM;
|
|
|
|
if (argc)
|
|
ret = createfn(argc, argv);
|
|
|
|
argv_free(argv);
|
|
|
|
return ret;
|
|
}
|
|
|
|
#define WRITE_BUFSIZE 4096
|
|
|
|
ssize_t traceprobe_probes_write(struct file *file, const char __user *buffer,
|
|
size_t count, loff_t *ppos,
|
|
int (*createfn)(int, char **))
|
|
{
|
|
char *kbuf, *tmp;
|
|
int ret = 0;
|
|
size_t done = 0;
|
|
size_t size;
|
|
|
|
kbuf = kmalloc(WRITE_BUFSIZE, GFP_KERNEL);
|
|
if (!kbuf)
|
|
return -ENOMEM;
|
|
|
|
while (done < count) {
|
|
size = count - done;
|
|
|
|
if (size >= WRITE_BUFSIZE)
|
|
size = WRITE_BUFSIZE - 1;
|
|
|
|
if (copy_from_user(kbuf, buffer + done, size)) {
|
|
ret = -EFAULT;
|
|
goto out;
|
|
}
|
|
kbuf[size] = '\0';
|
|
tmp = strchr(kbuf, '\n');
|
|
|
|
if (tmp) {
|
|
*tmp = '\0';
|
|
size = tmp - kbuf + 1;
|
|
} else if (done + size < count) {
|
|
pr_warning("Line length is too long: "
|
|
"Should be less than %d.", WRITE_BUFSIZE);
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
done += size;
|
|
/* Remove comments */
|
|
tmp = strchr(kbuf, '#');
|
|
|
|
if (tmp)
|
|
*tmp = '\0';
|
|
|
|
ret = traceprobe_command(kbuf, createfn);
|
|
if (ret)
|
|
goto out;
|
|
}
|
|
ret = done;
|
|
|
|
out:
|
|
kfree(kbuf);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int __set_print_fmt(struct trace_probe *tp, char *buf, int len,
|
|
bool is_return)
|
|
{
|
|
int i;
|
|
int pos = 0;
|
|
|
|
const char *fmt, *arg;
|
|
|
|
if (!is_return) {
|
|
fmt = "(%lx)";
|
|
arg = "REC->" FIELD_STRING_IP;
|
|
} else {
|
|
fmt = "(%lx <- %lx)";
|
|
arg = "REC->" FIELD_STRING_FUNC ", REC->" FIELD_STRING_RETIP;
|
|
}
|
|
|
|
/* When len=0, we just calculate the needed length */
|
|
#define LEN_OR_ZERO (len ? len - pos : 0)
|
|
|
|
pos += snprintf(buf + pos, LEN_OR_ZERO, "\"%s", fmt);
|
|
|
|
for (i = 0; i < tp->nr_args; i++) {
|
|
pos += snprintf(buf + pos, LEN_OR_ZERO, " %s=%s",
|
|
tp->args[i].name, tp->args[i].type->fmt);
|
|
}
|
|
|
|
pos += snprintf(buf + pos, LEN_OR_ZERO, "\", %s", arg);
|
|
|
|
for (i = 0; i < tp->nr_args; i++) {
|
|
if (strcmp(tp->args[i].type->name, "string") == 0)
|
|
pos += snprintf(buf + pos, LEN_OR_ZERO,
|
|
", __get_str(%s)",
|
|
tp->args[i].name);
|
|
else
|
|
pos += snprintf(buf + pos, LEN_OR_ZERO, ", REC->%s",
|
|
tp->args[i].name);
|
|
}
|
|
|
|
#undef LEN_OR_ZERO
|
|
|
|
/* return the length of print_fmt */
|
|
return pos;
|
|
}
|
|
|
|
int set_print_fmt(struct trace_probe *tp, bool is_return)
|
|
{
|
|
int len;
|
|
char *print_fmt;
|
|
|
|
/* First: called with 0 length to calculate the needed length */
|
|
len = __set_print_fmt(tp, NULL, 0, is_return);
|
|
print_fmt = kmalloc(len + 1, GFP_KERNEL);
|
|
if (!print_fmt)
|
|
return -ENOMEM;
|
|
|
|
/* Second: actually write the @print_fmt */
|
|
__set_print_fmt(tp, print_fmt, len + 1, is_return);
|
|
tp->call.print_fmt = print_fmt;
|
|
|
|
return 0;
|
|
}
|