diff options
Diffstat (limited to 'kernel/trace/trace_kprobe.c')
| -rw-r--r-- | kernel/trace/trace_kprobe.c | 35 |
1 files changed, 26 insertions, 9 deletions
diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c index 1b3fa7b854aa..23dba01831f7 100644 --- a/kernel/trace/trace_kprobe.c +++ b/kernel/trace/trace_kprobe.c @@ -732,9 +732,10 @@ static int __trace_kprobe_create(int argc, const char *argv[]) * FETCHARG:TYPE : use TYPE instead of unsigned long. */ struct trace_kprobe *tk = NULL; - int i, len, ret = 0; + int i, len, new_argc = 0, ret = 0; bool is_return = false; char *symbol = NULL, *tmp = NULL; + const char **new_argv = NULL; const char *event = NULL, *group = KPROBE_EVENT_SYSTEM; enum probe_print_type ptype; int maxactive = 0; @@ -742,7 +743,8 @@ static int __trace_kprobe_create(int argc, const char *argv[]) void *addr = NULL; char buf[MAX_EVENT_NAME_LEN]; char gbuf[MAX_EVENT_NAME_LEN]; - unsigned int flags = TPARG_FL_KERNEL; + char abuf[MAX_BTF_ARGS_LEN]; + struct traceprobe_parse_context ctx = { .flags = TPARG_FL_KERNEL }; switch (argv[0][0]) { case 'r': @@ -764,7 +766,7 @@ static int __trace_kprobe_create(int argc, const char *argv[]) if (isdigit(argv[0][1])) { if (!is_return) { - trace_probe_log_err(1, MAXACT_NO_KPROBE); + trace_probe_log_err(1, BAD_MAXACT_TYPE); goto parse_error; } if (event) @@ -823,10 +825,10 @@ static int __trace_kprobe_create(int argc, const char *argv[]) goto parse_error; } if (is_return) - flags |= TPARG_FL_RETURN; + ctx.flags |= TPARG_FL_RETURN; ret = kprobe_on_func_entry(NULL, symbol, offset); - if (ret == 0) - flags |= TPARG_FL_FENTRY; + if (ret == 0 && !is_return) + ctx.flags |= TPARG_FL_FENTRY; /* Defer the ENOENT case until register kprobe */ if (ret == -EINVAL && is_return) { trace_probe_log_err(0, BAD_RETPROBE); @@ -854,21 +856,35 @@ static int __trace_kprobe_create(int argc, const char *argv[]) event = buf; } + argc -= 2; argv += 2; + ctx.funcname = symbol; + new_argv = traceprobe_expand_meta_args(argc, argv, &new_argc, + abuf, MAX_BTF_ARGS_LEN, &ctx); + if (IS_ERR(new_argv)) { + ret = PTR_ERR(new_argv); + new_argv = NULL; + goto out; + } + if (new_argv) { + argc = new_argc; + argv = new_argv; + } + /* setup a probe */ tk = alloc_trace_kprobe(group, event, addr, symbol, offset, maxactive, - argc - 2, is_return); + argc, is_return); if (IS_ERR(tk)) { ret = PTR_ERR(tk); /* This must return -ENOMEM, else there is a bug */ WARN_ON_ONCE(ret != -ENOMEM); goto out; /* We know tk is not allocated */ } - argc -= 2; argv += 2; /* parse arguments */ for (i = 0; i < argc && i < MAX_TRACE_ARGS; i++) { trace_probe_log_set_index(i + 2); - ret = traceprobe_parse_probe_arg(&tk->tp, i, argv[i], flags); + ctx.offset = 0; + ret = traceprobe_parse_probe_arg(&tk->tp, i, argv[i], &ctx); if (ret) goto error; /* This can be -ENOMEM */ } @@ -892,6 +908,7 @@ static int __trace_kprobe_create(int argc, const char *argv[]) out: trace_probe_log_clear(); + kfree(new_argv); kfree(symbol); return ret; |