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tracing: Use tracing error_log with probe events
Use tracing error_log with probe events for logging error more precisely. This also makes all parse error returns -EINVAL (except for -ENOMEM), because user can see better error message in error_log file now. Link: http://lkml.kernel.org/r/6a4d90e141d138040ea61f4776b991597077451e.1554072478.git.tom.zanussi@linux.intel.com Acked-by: Masami Hiramatsu <mhiramat@kernel.org> Acked-by: Namhyung Kim <namhyung@kernel.org> Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Masami Hiramatsu
Steven Rostedt (VMware)
parent
34f76afaac
commit
ab105a4fb8
4 changed files with 348 additions and 124 deletions
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@ -441,13 +441,8 @@ static int __register_trace_kprobe(struct trace_kprobe *tk)
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else
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ret = register_kprobe(&tk->rp.kp);
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if (ret == 0) {
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if (ret == 0)
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tk->tp.flags |= TP_FLAG_REGISTERED;
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} else if (ret == -EILSEQ) {
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pr_warn("Probing address(0x%p) is not an instruction boundary.\n",
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tk->rp.kp.addr);
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ret = -EINVAL;
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}
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return ret;
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}
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@ -591,7 +586,7 @@ static int trace_kprobe_create(int argc, const char *argv[])
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* Type of args:
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* FETCHARG:TYPE : use TYPE instead of unsigned long.
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*/
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struct trace_kprobe *tk;
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struct trace_kprobe *tk = NULL;
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int i, len, ret = 0;
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bool is_return = false;
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char *symbol = NULL, *tmp = NULL;
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@ -615,44 +610,50 @@ static int trace_kprobe_create(int argc, const char *argv[])
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if (argc < 2)
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return -ECANCELED;
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trace_probe_log_init("trace_kprobe", argc, argv);
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event = strchr(&argv[0][1], ':');
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if (event)
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event++;
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if (isdigit(argv[0][1])) {
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if (!is_return) {
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pr_info("Maxactive is not for kprobe");
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return -EINVAL;
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trace_probe_log_err(1, MAXACT_NO_KPROBE);
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goto parse_error;
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}
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if (event)
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len = event - &argv[0][1] - 1;
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else
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len = strlen(&argv[0][1]);
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if (len > MAX_EVENT_NAME_LEN - 1)
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return -E2BIG;
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if (len > MAX_EVENT_NAME_LEN - 1) {
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trace_probe_log_err(1, BAD_MAXACT);
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goto parse_error;
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}
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memcpy(buf, &argv[0][1], len);
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buf[len] = '\0';
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ret = kstrtouint(buf, 0, &maxactive);
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if (ret || !maxactive) {
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pr_info("Invalid maxactive number\n");
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return ret;
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trace_probe_log_err(1, BAD_MAXACT);
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goto parse_error;
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}
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/* kretprobes instances are iterated over via a list. The
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* maximum should stay reasonable.
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*/
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if (maxactive > KRETPROBE_MAXACTIVE_MAX) {
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pr_info("Maxactive is too big (%d > %d).\n",
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maxactive, KRETPROBE_MAXACTIVE_MAX);
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return -E2BIG;
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trace_probe_log_err(1, MAXACT_TOO_BIG);
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goto parse_error;
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}
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}
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/* try to parse an address. if that fails, try to read the
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* input as a symbol. */
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if (kstrtoul(argv[1], 0, (unsigned long *)&addr)) {
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trace_probe_log_set_index(1);
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/* Check whether uprobe event specified */
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if (strchr(argv[1], '/') && strchr(argv[1], ':'))
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return -ECANCELED;
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if (strchr(argv[1], '/') && strchr(argv[1], ':')) {
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ret = -ECANCELED;
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goto error;
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}
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/* a symbol specified */
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symbol = kstrdup(argv[1], GFP_KERNEL);
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if (!symbol)
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@ -660,23 +661,23 @@ static int trace_kprobe_create(int argc, const char *argv[])
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/* TODO: support .init module functions */
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ret = traceprobe_split_symbol_offset(symbol, &offset);
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if (ret || offset < 0 || offset > UINT_MAX) {
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pr_info("Failed to parse either an address or a symbol.\n");
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goto out;
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trace_probe_log_err(0, BAD_PROBE_ADDR);
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goto parse_error;
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}
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if (kprobe_on_func_entry(NULL, symbol, offset))
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flags |= TPARG_FL_FENTRY;
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if (offset && is_return && !(flags & TPARG_FL_FENTRY)) {
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pr_info("Given offset is not valid for return probe.\n");
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ret = -EINVAL;
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goto out;
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trace_probe_log_err(0, BAD_RETPROBE);
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goto parse_error;
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}
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}
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argc -= 2; argv += 2;
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trace_probe_log_set_index(0);
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if (event) {
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ret = traceprobe_parse_event_name(&event, &group, buf);
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ret = traceprobe_parse_event_name(&event, &group, buf,
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event - argv[0]);
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if (ret)
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goto out;
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goto parse_error;
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} else {
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/* Make a new event name */
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if (symbol)
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@ -691,13 +692,14 @@ static int trace_kprobe_create(int argc, const char *argv[])
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/* setup a probe */
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tk = alloc_trace_kprobe(group, event, addr, symbol, offset, maxactive,
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argc, is_return);
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argc - 2, is_return);
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if (IS_ERR(tk)) {
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ret = PTR_ERR(tk);
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/* This must return -ENOMEM otherwise there is a bug */
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/* This must return -ENOMEM, else there is a bug */
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WARN_ON_ONCE(ret != -ENOMEM);
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goto out;
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goto out; /* We know tk is not allocated */
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}
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argc -= 2; argv += 2;
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/* parse arguments */
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for (i = 0; i < argc && i < MAX_TRACE_ARGS; i++) {
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@ -707,19 +709,32 @@ static int trace_kprobe_create(int argc, const char *argv[])
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goto error;
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}
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trace_probe_log_set_index(i + 2);
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ret = traceprobe_parse_probe_arg(&tk->tp, i, tmp, flags);
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kfree(tmp);
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if (ret)
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goto error;
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goto error; /* This can be -ENOMEM */
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}
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ret = register_trace_kprobe(tk);
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if (ret)
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if (ret) {
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trace_probe_log_set_index(1);
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if (ret == -EILSEQ)
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trace_probe_log_err(0, BAD_INSN_BNDRY);
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else if (ret == -ENOENT)
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trace_probe_log_err(0, BAD_PROBE_ADDR);
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else if (ret != -ENOMEM)
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trace_probe_log_err(0, FAIL_REG_PROBE);
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goto error;
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}
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out:
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trace_probe_log_clear();
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kfree(symbol);
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return ret;
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parse_error:
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ret = -EINVAL;
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error:
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free_trace_kprobe(tk);
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goto out;
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@ -13,6 +13,11 @@
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#include "trace_probe.h"
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#undef C
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#define C(a, b) b
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static const char *trace_probe_err_text[] = { ERRORS };
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static const char *reserved_field_names[] = {
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"common_type",
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"common_flags",
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@ -133,6 +138,60 @@ static const struct fetch_type *find_fetch_type(const char *type)
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return NULL;
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}
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static struct trace_probe_log trace_probe_log;
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void trace_probe_log_init(const char *subsystem, int argc, const char **argv)
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{
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trace_probe_log.subsystem = subsystem;
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trace_probe_log.argc = argc;
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trace_probe_log.argv = argv;
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trace_probe_log.index = 0;
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}
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void trace_probe_log_clear(void)
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{
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memset(&trace_probe_log, 0, sizeof(trace_probe_log));
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}
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void trace_probe_log_set_index(int index)
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{
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trace_probe_log.index = index;
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}
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void __trace_probe_log_err(int offset, int err_type)
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{
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char *command, *p;
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int i, len = 0, pos = 0;
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if (!trace_probe_log.argv)
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return;
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/* Recalcurate the length and allocate buffer */
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for (i = 0; i < trace_probe_log.argc; i++) {
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if (i == trace_probe_log.index)
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pos = len;
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len += strlen(trace_probe_log.argv[i]) + 1;
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}
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command = kzalloc(len, GFP_KERNEL);
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if (!command)
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return;
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/* And make a command string from argv array */
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p = command;
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for (i = 0; i < trace_probe_log.argc; i++) {
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len = strlen(trace_probe_log.argv[i]);
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strcpy(p, trace_probe_log.argv[i]);
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p[len] = ' ';
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p += len + 1;
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}
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*(p - 1) = '\0';
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tracing_log_err(trace_probe_log.subsystem, command,
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trace_probe_err_text, err_type, pos + offset);
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kfree(command);
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}
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/* Split symbol and offset. */
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int traceprobe_split_symbol_offset(char *symbol, long *offset)
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{
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@ -156,7 +215,7 @@ int traceprobe_split_symbol_offset(char *symbol, long *offset)
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/* @buf must has MAX_EVENT_NAME_LEN size */
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int traceprobe_parse_event_name(const char **pevent, const char **pgroup,
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char *buf)
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char *buf, int offset)
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{
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const char *slash, *event = *pevent;
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int len;
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@ -164,32 +223,33 @@ int traceprobe_parse_event_name(const char **pevent, const char **pgroup,
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slash = strchr(event, '/');
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if (slash) {
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if (slash == event) {
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pr_info("Group name is not specified\n");
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trace_probe_log_err(offset, NO_GROUP_NAME);
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return -EINVAL;
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}
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if (slash - event + 1 > MAX_EVENT_NAME_LEN) {
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pr_info("Group name is too long\n");
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return -E2BIG;
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trace_probe_log_err(offset, GROUP_TOO_LONG);
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return -EINVAL;
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}
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strlcpy(buf, event, slash - event + 1);
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if (!is_good_name(buf)) {
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pr_info("Group name must follow the same rules as C identifiers\n");
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trace_probe_log_err(offset, BAD_GROUP_NAME);
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return -EINVAL;
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}
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*pgroup = buf;
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*pevent = slash + 1;
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offset += slash - event + 1;
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event = *pevent;
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}
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len = strlen(event);
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if (len == 0) {
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pr_info("Event name is not specified\n");
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trace_probe_log_err(offset, NO_EVENT_NAME);
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return -EINVAL;
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} else if (len > MAX_EVENT_NAME_LEN) {
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pr_info("Event name is too long\n");
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return -E2BIG;
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trace_probe_log_err(offset, EVENT_TOO_LONG);
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return -EINVAL;
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}
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if (!is_good_name(event)) {
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pr_info("Event name must follow the same rules as C identifiers\n");
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trace_probe_log_err(offset, BAD_EVENT_NAME);
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return -EINVAL;
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}
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return 0;
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@ -198,56 +258,67 @@ int traceprobe_parse_event_name(const char **pevent, const char **pgroup,
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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_insn *code, unsigned int flags)
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struct fetch_insn *code, unsigned int flags, int offs)
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{
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unsigned long param;
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int ret = 0;
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int len;
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if (strcmp(arg, "retval") == 0) {
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if (flags & TPARG_FL_RETURN)
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if (flags & TPARG_FL_RETURN) {
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code->op = FETCH_OP_RETVAL;
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else
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} else {
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trace_probe_log_err(offs, RETVAL_ON_PROBE);
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ret = -EINVAL;
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}
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} else if ((len = str_has_prefix(arg, "stack"))) {
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if (arg[len] == '\0') {
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code->op = FETCH_OP_STACKP;
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} else if (isdigit(arg[len])) {
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ret = kstrtoul(arg + len, 10, ¶m);
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if (ret || ((flags & TPARG_FL_KERNEL) &&
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param > PARAM_MAX_STACK))
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if (ret) {
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goto inval_var;
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} else if ((flags & TPARG_FL_KERNEL) &&
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param > PARAM_MAX_STACK) {
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trace_probe_log_err(offs, BAD_STACK_NUM);
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ret = -EINVAL;
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else {
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} else {
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code->op = FETCH_OP_STACK;
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code->param = (unsigned int)param;
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}
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} else
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ret = -EINVAL;
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goto inval_var;
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} else if (strcmp(arg, "comm") == 0) {
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code->op = FETCH_OP_COMM;
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#ifdef CONFIG_HAVE_FUNCTION_ARG_ACCESS_API
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} else if (((flags & TPARG_FL_MASK) ==
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(TPARG_FL_KERNEL | TPARG_FL_FENTRY)) &&
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(len = str_has_prefix(arg, "arg"))) {
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if (!isdigit(arg[len]))
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return -EINVAL;
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ret = kstrtoul(arg + len, 10, ¶m);
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if (ret || !param || param > PARAM_MAX_STACK)
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if (ret) {
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goto inval_var;
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} else if (!param || param > PARAM_MAX_STACK) {
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trace_probe_log_err(offs, BAD_ARG_NUM);
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return -EINVAL;
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}
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code->op = FETCH_OP_ARG;
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code->param = (unsigned int)param - 1;
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#endif
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} else
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ret = -EINVAL;
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goto inval_var;
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return ret;
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inval_var:
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trace_probe_log_err(offs, BAD_VAR);
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return -EINVAL;
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}
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/* Recursive argument parser */
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static int
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parse_probe_arg(char *arg, const struct fetch_type *type,
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struct fetch_insn **pcode, struct fetch_insn *end,
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unsigned int flags)
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unsigned int flags, int offs)
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{
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struct fetch_insn *code = *pcode;
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unsigned long param;
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@ -257,7 +328,7 @@ parse_probe_arg(char *arg, const struct fetch_type *type,
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switch (arg[0]) {
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case '$':
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ret = parse_probe_vars(arg + 1, type, code, flags);
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ret = parse_probe_vars(arg + 1, type, code, flags, offs);
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break;
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case '%': /* named register */
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@ -266,47 +337,57 @@ parse_probe_arg(char *arg, const struct fetch_type *type,
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code->op = FETCH_OP_REG;
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code->param = (unsigned int)ret;
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ret = 0;
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}
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} else
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trace_probe_log_err(offs, BAD_REG_NAME);
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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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if (ret) {
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trace_probe_log_err(offs, BAD_MEM_ADDR);
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break;
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}
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/* load address */
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code->op = FETCH_OP_IMM;
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code->immediate = param;
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} else if (arg[1] == '+') {
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/* kprobes don't support file offsets */
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if (flags & TPARG_FL_KERNEL)
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if (flags & TPARG_FL_KERNEL) {
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trace_probe_log_err(offs, FILE_ON_KPROBE);
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return -EINVAL;
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}
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ret = kstrtol(arg + 2, 0, &offset);
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if (ret)
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if (ret) {
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trace_probe_log_err(offs, BAD_FILE_OFFS);
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break;
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}
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code->op = FETCH_OP_FOFFS;
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code->immediate = (unsigned long)offset; // imm64?
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} else {
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/* uprobes don't support symbols */
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if (!(flags & TPARG_FL_KERNEL))
|
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if (!(flags & TPARG_FL_KERNEL)) {
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trace_probe_log_err(offs, SYM_ON_UPROBE);
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return -EINVAL;
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}
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/* Preserve symbol for updating */
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code->op = FETCH_NOP_SYMBOL;
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code->data = kstrdup(arg + 1, GFP_KERNEL);
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if (!code->data)
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return -ENOMEM;
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if (++code == end)
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return -E2BIG;
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if (++code == end) {
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trace_probe_log_err(offs, TOO_MANY_OPS);
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return -EINVAL;
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}
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code->op = FETCH_OP_IMM;
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code->immediate = 0;
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}
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/* These are fetching from memory */
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if (++code == end)
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return -E2BIG;
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if (++code == end) {
|
||||
trace_probe_log_err(offs, TOO_MANY_OPS);
|
||||
return -EINVAL;
|
||||
}
|
||||
*pcode = code;
|
||||
code->op = FETCH_OP_DEREF;
|
||||
code->offset = offset;
|
||||
|
|
@ -317,28 +398,38 @@ parse_probe_arg(char *arg, const struct fetch_type *type,
|
|||
/* fall through */
|
||||
case '-':
|
||||
tmp = strchr(arg, '(');
|
||||
if (!tmp)
|
||||
if (!tmp) {
|
||||
trace_probe_log_err(offs, DEREF_NEED_BRACE);
|
||||
return -EINVAL;
|
||||
|
||||
}
|
||||
*tmp = '\0';
|
||||
ret = kstrtol(arg, 0, &offset);
|
||||
if (ret)
|
||||
if (ret) {
|
||||
trace_probe_log_err(offs, BAD_DEREF_OFFS);
|
||||
break;
|
||||
|
||||
}
|
||||
offs += (tmp + 1 - arg) + (arg[0] != '-' ? 1 : 0);
|
||||
arg = tmp + 1;
|
||||
tmp = strrchr(arg, ')');
|
||||
|
||||
if (tmp) {
|
||||
if (!tmp) {
|
||||
trace_probe_log_err(offs + strlen(arg),
|
||||
DEREF_OPEN_BRACE);
|
||||
return -EINVAL;
|
||||
} else {
|
||||
const struct fetch_type *t2 = find_fetch_type(NULL);
|
||||
|
||||
*tmp = '\0';
|
||||
ret = parse_probe_arg(arg, t2, &code, end, flags);
|
||||
ret = parse_probe_arg(arg, t2, &code, end, flags, offs);
|
||||
if (ret)
|
||||
break;
|
||||
if (code->op == FETCH_OP_COMM)
|
||||
if (code->op == FETCH_OP_COMM) {
|
||||
trace_probe_log_err(offs, COMM_CANT_DEREF);
|
||||
return -EINVAL;
|
||||
if (++code == end)
|
||||
return -E2BIG;
|
||||
}
|
||||
if (++code == end) {
|
||||
trace_probe_log_err(offs, TOO_MANY_OPS);
|
||||
return -EINVAL;
|
||||
}
|
||||
*pcode = code;
|
||||
|
||||
code->op = FETCH_OP_DEREF;
|
||||
|
|
@ -348,6 +439,7 @@ parse_probe_arg(char *arg, const struct fetch_type *type,
|
|||
}
|
||||
if (!ret && code->op == FETCH_OP_NOP) {
|
||||
/* Parsed, but do not find fetch method */
|
||||
trace_probe_log_err(offs, BAD_FETCH_ARG);
|
||||
ret = -EINVAL;
|
||||
}
|
||||
return ret;
|
||||
|
|
@ -379,7 +471,7 @@ static int __parse_bitfield_probe_arg(const char *bf,
|
|||
return -EINVAL;
|
||||
code++;
|
||||
if (code->op != FETCH_OP_NOP)
|
||||
return -E2BIG;
|
||||
return -EINVAL;
|
||||
*pcode = code;
|
||||
|
||||
code->op = FETCH_OP_MOD_BF;
|
||||
|
|
@ -392,32 +484,53 @@ static int __parse_bitfield_probe_arg(const char *bf,
|
|||
|
||||
/* String length checking wrapper */
|
||||
static int traceprobe_parse_probe_arg_body(char *arg, ssize_t *size,
|
||||
struct probe_arg *parg, unsigned int flags)
|
||||
struct probe_arg *parg, unsigned int flags, int offset)
|
||||
{
|
||||
struct fetch_insn *code, *scode, *tmp = NULL;
|
||||
char *t, *t2;
|
||||
char *t, *t2, *t3;
|
||||
int ret, len;
|
||||
|
||||
if (strlen(arg) > MAX_ARGSTR_LEN) {
|
||||
pr_info("Argument is too long.: %s\n", arg);
|
||||
return -ENOSPC;
|
||||
len = strlen(arg);
|
||||
if (len > MAX_ARGSTR_LEN) {
|
||||
trace_probe_log_err(offset, ARG_TOO_LONG);
|
||||
return -EINVAL;
|
||||
} else if (len == 0) {
|
||||
trace_probe_log_err(offset, NO_ARG_BODY);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
parg->comm = kstrdup(arg, GFP_KERNEL);
|
||||
if (!parg->comm) {
|
||||
pr_info("Failed to allocate memory for command '%s'.\n", arg);
|
||||
if (!parg->comm)
|
||||
return -ENOMEM;
|
||||
}
|
||||
|
||||
t = strchr(arg, ':');
|
||||
if (t) {
|
||||
*t = '\0';
|
||||
t2 = strchr(++t, '[');
|
||||
if (t2) {
|
||||
*t2 = '\0';
|
||||
parg->count = simple_strtoul(t2 + 1, &t2, 0);
|
||||
if (strcmp(t2, "]") || parg->count == 0)
|
||||
*t2++ = '\0';
|
||||
t3 = strchr(t2, ']');
|
||||
if (!t3) {
|
||||
offset += t2 + strlen(t2) - arg;
|
||||
trace_probe_log_err(offset,
|
||||
ARRAY_NO_CLOSE);
|
||||
return -EINVAL;
|
||||
if (parg->count > MAX_ARRAY_LEN)
|
||||
return -E2BIG;
|
||||
} else if (t3[1] != '\0') {
|
||||
trace_probe_log_err(offset + t3 + 1 - arg,
|
||||
BAD_ARRAY_SUFFIX);
|
||||
return -EINVAL;
|
||||
}
|
||||
*t3 = '\0';
|
||||
if (kstrtouint(t2, 0, &parg->count) || !parg->count) {
|
||||
trace_probe_log_err(offset + t2 - arg,
|
||||
BAD_ARRAY_NUM);
|
||||
return -EINVAL;
|
||||
}
|
||||
if (parg->count > MAX_ARRAY_LEN) {
|
||||
trace_probe_log_err(offset + t2 - arg,
|
||||
ARRAY_TOO_BIG);
|
||||
return -EINVAL;
|
||||
}
|
||||
}
|
||||
}
|
||||
/*
|
||||
|
|
@ -429,7 +542,7 @@ static int traceprobe_parse_probe_arg_body(char *arg, ssize_t *size,
|
|||
else
|
||||
parg->type = find_fetch_type(t);
|
||||
if (!parg->type) {
|
||||
pr_info("Unsupported type: %s\n", t);
|
||||
trace_probe_log_err(offset + (t ? (t - arg) : 0), BAD_TYPE);
|
||||
return -EINVAL;
|
||||
}
|
||||
parg->offset = *size;
|
||||
|
|
@ -450,7 +563,7 @@ static int traceprobe_parse_probe_arg_body(char *arg, ssize_t *size,
|
|||
code[FETCH_INSN_MAX - 1].op = FETCH_OP_END;
|
||||
|
||||
ret = parse_probe_arg(arg, parg->type, &code, &code[FETCH_INSN_MAX - 1],
|
||||
flags);
|
||||
flags, offset);
|
||||
if (ret)
|
||||
goto fail;
|
||||
|
||||
|
|
@ -458,7 +571,8 @@ static int traceprobe_parse_probe_arg_body(char *arg, ssize_t *size,
|
|||
if (!strcmp(parg->type->name, "string")) {
|
||||
if (code->op != FETCH_OP_DEREF && code->op != FETCH_OP_IMM &&
|
||||
code->op != FETCH_OP_COMM) {
|
||||
pr_info("string only accepts memory or address.\n");
|
||||
trace_probe_log_err(offset + (t ? (t - arg) : 0),
|
||||
BAD_STRING);
|
||||
ret = -EINVAL;
|
||||
goto fail;
|
||||
}
|
||||
|
|
@ -470,7 +584,8 @@ static int traceprobe_parse_probe_arg_body(char *arg, ssize_t *size,
|
|||
*/
|
||||
code++;
|
||||
if (code->op != FETCH_OP_NOP) {
|
||||
ret = -E2BIG;
|
||||
trace_probe_log_err(offset, TOO_MANY_OPS);
|
||||
ret = -EINVAL;
|
||||
goto fail;
|
||||
}
|
||||
}
|
||||
|
|
@ -483,7 +598,8 @@ static int traceprobe_parse_probe_arg_body(char *arg, ssize_t *size,
|
|||
} else {
|
||||
code++;
|
||||
if (code->op != FETCH_OP_NOP) {
|
||||
ret = -E2BIG;
|
||||
trace_probe_log_err(offset, TOO_MANY_OPS);
|
||||
ret = -EINVAL;
|
||||
goto fail;
|
||||
}
|
||||
code->op = FETCH_OP_ST_RAW;
|
||||
|
|
@ -493,20 +609,24 @@ static int traceprobe_parse_probe_arg_body(char *arg, ssize_t *size,
|
|||
/* Modify operation */
|
||||
if (t != NULL) {
|
||||
ret = __parse_bitfield_probe_arg(t, parg->type, &code);
|
||||
if (ret)
|
||||
if (ret) {
|
||||
trace_probe_log_err(offset + t - arg, BAD_BITFIELD);
|
||||
goto fail;
|
||||
}
|
||||
}
|
||||
/* Loop(Array) operation */
|
||||
if (parg->count) {
|
||||
if (scode->op != FETCH_OP_ST_MEM &&
|
||||
scode->op != FETCH_OP_ST_STRING) {
|
||||
pr_info("array only accepts memory or address\n");
|
||||
trace_probe_log_err(offset + (t ? (t - arg) : 0),
|
||||
BAD_STRING);
|
||||
ret = -EINVAL;
|
||||
goto fail;
|
||||
}
|
||||
code++;
|
||||
if (code->op != FETCH_OP_NOP) {
|
||||
ret = -E2BIG;
|
||||
trace_probe_log_err(offset, TOO_MANY_OPS);
|
||||
ret = -EINVAL;
|
||||
goto fail;
|
||||
}
|
||||
code->op = FETCH_OP_LP_ARRAY;
|
||||
|
|
@ -555,15 +675,19 @@ int traceprobe_parse_probe_arg(struct trace_probe *tp, int i, char *arg,
|
|||
{
|
||||
struct probe_arg *parg = &tp->args[i];
|
||||
char *body;
|
||||
int ret;
|
||||
|
||||
/* Increment count for freeing args in error case */
|
||||
tp->nr_args++;
|
||||
|
||||
body = strchr(arg, '=');
|
||||
if (body) {
|
||||
if (body - arg > MAX_ARG_NAME_LEN || body == arg)
|
||||
if (body - arg > MAX_ARG_NAME_LEN) {
|
||||
trace_probe_log_err(0, ARG_NAME_TOO_LONG);
|
||||
return -EINVAL;
|
||||
} else if (body == arg) {
|
||||
trace_probe_log_err(0, NO_ARG_NAME);
|
||||
return -EINVAL;
|
||||
}
|
||||
parg->name = kmemdup_nul(arg, body - arg, GFP_KERNEL);
|
||||
body++;
|
||||
} else {
|
||||
|
|
@ -575,22 +699,16 @@ int traceprobe_parse_probe_arg(struct trace_probe *tp, int i, char *arg,
|
|||
return -ENOMEM;
|
||||
|
||||
if (!is_good_name(parg->name)) {
|
||||
pr_info("Invalid argument[%d] name: %s\n",
|
||||
i, parg->name);
|
||||
trace_probe_log_err(0, BAD_ARG_NAME);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
if (traceprobe_conflict_field_name(parg->name, tp->args, i)) {
|
||||
pr_info("Argument[%d]: '%s' conflicts with another field.\n",
|
||||
i, parg->name);
|
||||
trace_probe_log_err(0, USED_ARG_NAME);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
/* Parse fetch argument */
|
||||
ret = traceprobe_parse_probe_arg_body(body, &tp->size, parg, flags);
|
||||
if (ret)
|
||||
pr_info("Parse error at argument[%d]. (%d)\n", i, ret);
|
||||
return ret;
|
||||
return traceprobe_parse_probe_arg_body(body, &tp->size, parg, flags,
|
||||
body - arg);
|
||||
}
|
||||
|
||||
void traceprobe_free_probe_arg(struct probe_arg *arg)
|
||||
|
|
|
|||
|
|
@ -280,8 +280,8 @@ extern int traceprobe_update_arg(struct probe_arg *arg);
|
|||
extern void traceprobe_free_probe_arg(struct probe_arg *arg);
|
||||
|
||||
extern int traceprobe_split_symbol_offset(char *symbol, long *offset);
|
||||
extern int traceprobe_parse_event_name(const char **pevent,
|
||||
const char **pgroup, char *buf);
|
||||
int traceprobe_parse_event_name(const char **pevent, const char **pgroup,
|
||||
char *buf, int offset);
|
||||
|
||||
extern int traceprobe_set_print_fmt(struct trace_probe *tp, bool is_return);
|
||||
|
||||
|
|
@ -298,3 +298,76 @@ extern void destroy_local_trace_uprobe(struct trace_event_call *event_call);
|
|||
#endif
|
||||
extern int traceprobe_define_arg_fields(struct trace_event_call *event_call,
|
||||
size_t offset, struct trace_probe *tp);
|
||||
|
||||
#undef ERRORS
|
||||
#define ERRORS \
|
||||
C(FILE_NOT_FOUND, "Failed to find the given file"), \
|
||||
C(NO_REGULAR_FILE, "Not a regular file"), \
|
||||
C(BAD_REFCNT, "Invalid reference counter offset"), \
|
||||
C(REFCNT_OPEN_BRACE, "Reference counter brace is not closed"), \
|
||||
C(BAD_REFCNT_SUFFIX, "Reference counter has wrong suffix"), \
|
||||
C(BAD_UPROBE_OFFS, "Invalid uprobe offset"), \
|
||||
C(MAXACT_NO_KPROBE, "Maxactive is not for kprobe"), \
|
||||
C(BAD_MAXACT, "Invalid maxactive number"), \
|
||||
C(MAXACT_TOO_BIG, "Maxactive is too big"), \
|
||||
C(BAD_PROBE_ADDR, "Invalid probed address or symbol"), \
|
||||
C(BAD_RETPROBE, "Retprobe address must be an function entry"), \
|
||||
C(NO_GROUP_NAME, "Group name is not specified"), \
|
||||
C(GROUP_TOO_LONG, "Group name is too long"), \
|
||||
C(BAD_GROUP_NAME, "Group name must follow the same rules as C identifiers"), \
|
||||
C(NO_EVENT_NAME, "Event name is not specified"), \
|
||||
C(EVENT_TOO_LONG, "Event name is too long"), \
|
||||
C(BAD_EVENT_NAME, "Event name must follow the same rules as C identifiers"), \
|
||||
C(RETVAL_ON_PROBE, "$retval is not available on probe"), \
|
||||
C(BAD_STACK_NUM, "Invalid stack number"), \
|
||||
C(BAD_ARG_NUM, "Invalid argument number"), \
|
||||
C(BAD_VAR, "Invalid $-valiable specified"), \
|
||||
C(BAD_REG_NAME, "Invalid register name"), \
|
||||
C(BAD_MEM_ADDR, "Invalid memory address"), \
|
||||
C(FILE_ON_KPROBE, "File offset is not available with kprobe"), \
|
||||
C(BAD_FILE_OFFS, "Invalid file offset value"), \
|
||||
C(SYM_ON_UPROBE, "Symbol is not available with uprobe"), \
|
||||
C(TOO_MANY_OPS, "Dereference is too much nested"), \
|
||||
C(DEREF_NEED_BRACE, "Dereference needs a brace"), \
|
||||
C(BAD_DEREF_OFFS, "Invalid dereference offset"), \
|
||||
C(DEREF_OPEN_BRACE, "Dereference brace is not closed"), \
|
||||
C(COMM_CANT_DEREF, "$comm can not be dereferenced"), \
|
||||
C(BAD_FETCH_ARG, "Invalid fetch argument"), \
|
||||
C(ARRAY_NO_CLOSE, "Array is not closed"), \
|
||||
C(BAD_ARRAY_SUFFIX, "Array has wrong suffix"), \
|
||||
C(BAD_ARRAY_NUM, "Invalid array size"), \
|
||||
C(ARRAY_TOO_BIG, "Array number is too big"), \
|
||||
C(BAD_TYPE, "Unknown type is specified"), \
|
||||
C(BAD_STRING, "String accepts only memory argument"), \
|
||||
C(BAD_BITFIELD, "Invalid bitfield"), \
|
||||
C(ARG_NAME_TOO_LONG, "Argument name is too long"), \
|
||||
C(NO_ARG_NAME, "Argument name is not specified"), \
|
||||
C(BAD_ARG_NAME, "Argument name must follow the same rules as C identifiers"), \
|
||||
C(USED_ARG_NAME, "This argument name is already used"), \
|
||||
C(ARG_TOO_LONG, "Argument expression is too long"), \
|
||||
C(NO_ARG_BODY, "No argument expression"), \
|
||||
C(BAD_INSN_BNDRY, "Probe point is not an instruction boundary"),\
|
||||
C(FAIL_REG_PROBE, "Failed to register probe event"),
|
||||
|
||||
#undef C
|
||||
#define C(a, b) TP_ERR_##a
|
||||
|
||||
/* Define TP_ERR_ */
|
||||
enum { ERRORS };
|
||||
|
||||
/* Error text is defined in trace_probe.c */
|
||||
|
||||
struct trace_probe_log {
|
||||
const char *subsystem;
|
||||
const char **argv;
|
||||
int argc;
|
||||
int index;
|
||||
};
|
||||
|
||||
void trace_probe_log_init(const char *subsystem, int argc, const char **argv);
|
||||
void trace_probe_log_set_index(int index);
|
||||
void trace_probe_log_clear(void);
|
||||
void __trace_probe_log_err(int offset, int err);
|
||||
|
||||
#define trace_probe_log_err(offs, err) \
|
||||
__trace_probe_log_err(offs, TP_ERR_##err)
|
||||
|
|
|
|||
|
|
@ -457,13 +457,19 @@ static int trace_uprobe_create(int argc, const char **argv)
|
|||
return -ECANCELED;
|
||||
}
|
||||
|
||||
trace_probe_log_init("trace_uprobe", argc, argv);
|
||||
trace_probe_log_set_index(1); /* filename is the 2nd argument */
|
||||
|
||||
*arg++ = '\0';
|
||||
ret = kern_path(filename, LOOKUP_FOLLOW, &path);
|
||||
if (ret) {
|
||||
trace_probe_log_err(0, FILE_NOT_FOUND);
|
||||
kfree(filename);
|
||||
trace_probe_log_clear();
|
||||
return ret;
|
||||
}
|
||||
if (!d_is_reg(path.dentry)) {
|
||||
trace_probe_log_err(0, NO_REGULAR_FILE);
|
||||
ret = -EINVAL;
|
||||
goto fail_address_parse;
|
||||
}
|
||||
|
|
@ -472,9 +478,16 @@ static int trace_uprobe_create(int argc, const char **argv)
|
|||
rctr = strchr(arg, '(');
|
||||
if (rctr) {
|
||||
rctr_end = strchr(rctr, ')');
|
||||
if (rctr > rctr_end || *(rctr_end + 1) != 0) {
|
||||
if (!rctr_end) {
|
||||
ret = -EINVAL;
|
||||
pr_info("Invalid reference counter offset.\n");
|
||||
rctr_end = rctr + strlen(rctr);
|
||||
trace_probe_log_err(rctr_end - filename,
|
||||
REFCNT_OPEN_BRACE);
|
||||
goto fail_address_parse;
|
||||
} else if (rctr_end[1] != '\0') {
|
||||
ret = -EINVAL;
|
||||
trace_probe_log_err(rctr_end + 1 - filename,
|
||||
BAD_REFCNT_SUFFIX);
|
||||
goto fail_address_parse;
|
||||
}
|
||||
|
||||
|
|
@ -482,22 +495,23 @@ static int trace_uprobe_create(int argc, const char **argv)
|
|||
*rctr_end = '\0';
|
||||
ret = kstrtoul(rctr, 0, &ref_ctr_offset);
|
||||
if (ret) {
|
||||
pr_info("Invalid reference counter offset.\n");
|
||||
trace_probe_log_err(rctr - filename, BAD_REFCNT);
|
||||
goto fail_address_parse;
|
||||
}
|
||||
}
|
||||
|
||||
/* Parse uprobe offset. */
|
||||
ret = kstrtoul(arg, 0, &offset);
|
||||
if (ret)
|
||||
if (ret) {
|
||||
trace_probe_log_err(arg - filename, BAD_UPROBE_OFFS);
|
||||
goto fail_address_parse;
|
||||
|
||||
argc -= 2;
|
||||
argv += 2;
|
||||
}
|
||||
|
||||
/* setup a probe */
|
||||
trace_probe_log_set_index(0);
|
||||
if (event) {
|
||||
ret = traceprobe_parse_event_name(&event, &group, buf);
|
||||
ret = traceprobe_parse_event_name(&event, &group, buf,
|
||||
event - argv[0]);
|
||||
if (ret)
|
||||
goto fail_address_parse;
|
||||
} else {
|
||||
|
|
@ -519,6 +533,9 @@ static int trace_uprobe_create(int argc, const char **argv)
|
|||
kfree(tail);
|
||||
}
|
||||
|
||||
argc -= 2;
|
||||
argv += 2;
|
||||
|
||||
tu = alloc_trace_uprobe(group, event, argc, is_return);
|
||||
if (IS_ERR(tu)) {
|
||||
ret = PTR_ERR(tu);
|
||||
|
|
@ -539,6 +556,7 @@ static int trace_uprobe_create(int argc, const char **argv)
|
|||
goto error;
|
||||
}
|
||||
|
||||
trace_probe_log_set_index(i + 2);
|
||||
ret = traceprobe_parse_probe_arg(&tu->tp, i, tmp,
|
||||
is_return ? TPARG_FL_RETURN : 0);
|
||||
kfree(tmp);
|
||||
|
|
@ -547,20 +565,20 @@ static int trace_uprobe_create(int argc, const char **argv)
|
|||
}
|
||||
|
||||
ret = register_trace_uprobe(tu);
|
||||
if (ret)
|
||||
goto error;
|
||||
return 0;
|
||||
if (!ret)
|
||||
goto out;
|
||||
|
||||
error:
|
||||
free_trace_uprobe(tu);
|
||||
out:
|
||||
trace_probe_log_clear();
|
||||
return ret;
|
||||
|
||||
fail_address_parse:
|
||||
trace_probe_log_clear();
|
||||
path_put(&path);
|
||||
kfree(filename);
|
||||
|
||||
pr_info("Failed to parse address or file.\n");
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
|
|
|
|||
Loading…
Reference in a new issue