diff options
| -rw-r--r-- | kernel/trace/trace_kprobe.c | 77 | ||||
| -rw-r--r-- | kernel/trace/trace_probe.c | 274 | ||||
| -rw-r--r-- | kernel/trace/trace_probe.h | 77 | ||||
| -rw-r--r-- | kernel/trace/trace_uprobe.c | 44 |
4 files changed, 348 insertions, 124 deletions
diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c index 5d5129b05df7..7d736248a070 100644 --- a/kernel/trace/trace_kprobe.c +++ b/kernel/trace/trace_kprobe.c @@ -441,13 +441,8 @@ static int __register_trace_kprobe(struct trace_kprobe *tk) else ret = register_kprobe(&tk->rp.kp); - if (ret == 0) { + if (ret == 0) tk->tp.flags |= TP_FLAG_REGISTERED; - } else if (ret == -EILSEQ) { - pr_warn("Probing address(0x%p) is not an instruction boundary.\n", - tk->rp.kp.addr); - ret = -EINVAL; - } return ret; } @@ -591,7 +586,7 @@ static int trace_kprobe_create(int argc, const char *argv[]) * Type of args: * FETCHARG:TYPE : use TYPE instead of unsigned long. */ - struct trace_kprobe *tk; + struct trace_kprobe *tk = NULL; int i, len, ret = 0; bool is_return = false; char *symbol = NULL, *tmp = NULL; @@ -615,44 +610,50 @@ static int trace_kprobe_create(int argc, const char *argv[]) if (argc < 2) return -ECANCELED; + trace_probe_log_init("trace_kprobe", argc, argv); + event = strchr(&argv[0][1], ':'); if (event) event++; if (isdigit(argv[0][1])) { if (!is_return) { - pr_info("Maxactive is not for kprobe"); - return -EINVAL; + trace_probe_log_err(1, MAXACT_NO_KPROBE); + goto parse_error; } if (event) len = event - &argv[0][1] - 1; else len = strlen(&argv[0][1]); - if (len > MAX_EVENT_NAME_LEN - 1) - return -E2BIG; + if (len > MAX_EVENT_NAME_LEN - 1) { + trace_probe_log_err(1, BAD_MAXACT); + goto parse_error; + } memcpy(buf, &argv[0][1], len); buf[len] = '\0'; ret = kstrtouint(buf, 0, &maxactive); if (ret || !maxactive) { - pr_info("Invalid maxactive number\n"); - return ret; + trace_probe_log_err(1, BAD_MAXACT); + goto parse_error; } /* kretprobes instances are iterated over via a list. The * maximum should stay reasonable. */ if (maxactive > KRETPROBE_MAXACTIVE_MAX) { - pr_info("Maxactive is too big (%d > %d).\n", - maxactive, KRETPROBE_MAXACTIVE_MAX); - return -E2BIG; + trace_probe_log_err(1, MAXACT_TOO_BIG); + goto parse_error; } } /* try to parse an address. if that fails, try to read the * input as a symbol. */ if (kstrtoul(argv[1], 0, (unsigned long *)&addr)) { + trace_probe_log_set_index(1); /* Check whether uprobe event specified */ - if (strchr(argv[1], '/') && strchr(argv[1], ':')) - return -ECANCELED; + if (strchr(argv[1], '/') && strchr(argv[1], ':')) { + ret = -ECANCELED; + goto error; + } /* a symbol specified */ symbol = kstrdup(argv[1], GFP_KERNEL); if (!symbol) @@ -660,23 +661,23 @@ static int trace_kprobe_create(int argc, const char *argv[]) /* TODO: support .init module functions */ ret = traceprobe_split_symbol_offset(symbol, &offset); if (ret || offset < 0 || offset > UINT_MAX) { - pr_info("Failed to parse either an address or a symbol.\n"); - goto out; + trace_probe_log_err(0, BAD_PROBE_ADDR); + goto parse_error; } if (kprobe_on_func_entry(NULL, symbol, offset)) flags |= TPARG_FL_FENTRY; if (offset && is_return && !(flags & TPARG_FL_FENTRY)) { - pr_info("Given offset is not valid for return probe.\n"); - ret = -EINVAL; - goto out; + trace_probe_log_err(0, BAD_RETPROBE); + goto parse_error; } } - argc -= 2; argv += 2; + 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 out; + goto parse_error; } else { /* Make a new event name */ if (symbol) @@ -691,13 +692,14 @@ static int trace_kprobe_create(int argc, const char *argv[]) /* setup a probe */ tk = alloc_trace_kprobe(group, event, addr, symbol, offset, maxactive, - argc, is_return); + argc - 2, is_return); if (IS_ERR(tk)) { ret = PTR_ERR(tk); - /* This must return -ENOMEM otherwise there is a bug */ + /* This must return -ENOMEM, else there is a bug */ WARN_ON_ONCE(ret != -ENOMEM); - goto out; + goto out; /* We know tk is not allocated */ } + argc -= 2; argv += 2; /* parse arguments */ for (i = 0; i < argc && i < MAX_TRACE_ARGS; i++) { @@ -707,19 +709,32 @@ static int trace_kprobe_create(int argc, const char *argv[]) goto error; } + trace_probe_log_set_index(i + 2); ret = traceprobe_parse_probe_arg(&tk->tp, i, tmp, flags); kfree(tmp); if (ret) - goto error; + goto error; /* This can be -ENOMEM */ } ret = register_trace_kprobe(tk); - if (ret) + if (ret) { + trace_probe_log_set_index(1); + if (ret == -EILSEQ) + trace_probe_log_err(0, BAD_INSN_BNDRY); + else if (ret == -ENOENT) + trace_probe_log_err(0, BAD_PROBE_ADDR); + else if (ret != -ENOMEM) + trace_probe_log_err(0, FAIL_REG_PROBE); goto error; + } + out: + trace_probe_log_clear(); kfree(symbol); return ret; +parse_error: + ret = -EINVAL; error: free_trace_kprobe(tk); goto out; diff --git a/kernel/trace/trace_probe.c b/kernel/trace/trace_probe.c index 8f8411e7835f..e11f98c49d72 100644 --- a/kernel/trace/trace_probe.c +++ b/kernel/trace/trace_probe.c @@ -13,6 +13,11 @@ #include "trace_probe.h" +#undef C +#define C(a, b) b + +static const char *trace_probe_err_text[] = { ERRORS }; + static const char *reserved_field_names[] = { "common_type", "common_flags", @@ -133,6 +138,60 @@ fail: return NULL; } +static struct trace_probe_log trace_probe_log; + +void trace_probe_log_init(const char *subsystem, int argc, const char **argv) +{ + trace_probe_log.subsystem = subsystem; + trace_probe_log.argc = argc; + trace_probe_log.argv = argv; + trace_probe_log.index = 0; +} + +void trace_probe_log_clear(void) +{ + memset(&trace_probe_log, 0, sizeof(trace_probe_log)); +} + +void trace_probe_log_set_index(int index) +{ + trace_probe_log.index = index; +} + +void __trace_probe_log_err(int offset, int err_type) +{ + char *command, *p; + int i, len = 0, pos = 0; + + if (!trace_probe_log.argv) + return; + + /* Recalcurate the length and allocate buffer */ + for (i = 0; i < trace_probe_log.argc; i++) { + if (i == trace_probe_log.index) + pos = len; + len += strlen(trace_probe_log.argv[i]) + 1; + } + command = kzalloc(len, GFP_KERNEL); + if (!command) + return; + + /* And make a command string from argv array */ + p = command; + for (i = 0; i < trace_probe_log.argc; i++) { + len = strlen(trace_probe_log.argv[i]); + strcpy(p, trace_probe_log.argv[i]); + p[len] = ' '; + p += len + 1; + } + *(p - 1) = '\0'; + + tracing_log_err(trace_probe_log.subsystem, command, + trace_probe_err_text, err_type, pos + offset); + + kfree(command); +} + /* Split symbol and offset. */ int traceprobe_split_symbol_offset(char *symbol, long *offset) { @@ -156,7 +215,7 @@ int traceprobe_split_symbol_offset(char *symbol, long *offset) /* @buf must has MAX_EVENT_NAME_LEN size */ int traceprobe_parse_event_name(const char **pevent, const char **pgroup, - char *buf) + char *buf, int offset) { const char *slash, *event = *pevent; int len; @@ -164,32 +223,33 @@ int traceprobe_parse_event_name(const char **pevent, const char **pgroup, slash = strchr(event, '/'); if (slash) { if (slash == event) { - pr_info("Group name is not specified\n"); + trace_probe_log_err(offset, NO_GROUP_NAME); return -EINVAL; } if (slash - event + 1 > MAX_EVENT_NAME_LEN) { - pr_info("Group name is too long\n"); - return -E2BIG; + trace_probe_log_err(offset, GROUP_TOO_LONG); + return -EINVAL; } strlcpy(buf, event, slash - event + 1); if (!is_good_name(buf)) { - pr_info("Group name must follow the same rules as C identifiers\n"); + trace_probe_log_err(offset, BAD_GROUP_NAME); return -EINVAL; } *pgroup = buf; *pevent = slash + 1; + offset += slash - event + 1; event = *pevent; } len = strlen(event); if (len == 0) { - pr_info("Event name is not specified\n"); + trace_probe_log_err(offset, NO_EVENT_NAME); return -EINVAL; } else if (len > MAX_EVENT_NAME_LEN) { - pr_info("Event name is too long\n"); - return -E2BIG; + trace_probe_log_err(offset, EVENT_TOO_LONG); + return -EINVAL; } if (!is_good_name(event)) { - pr_info("Event name must follow the same rules as C identifiers\n"); + trace_probe_log_err(offset, BAD_EVENT_NAME); return -EINVAL; } return 0; @@ -198,56 +258,67 @@ int traceprobe_parse_event_name(const char **pevent, const char **pgroup, #define PARAM_MAX_STACK (THREAD_SIZE / sizeof(unsigned long)) static int parse_probe_vars(char *arg, const struct fetch_type *t, - struct fetch_insn *code, unsigned int flags) + struct fetch_insn *code, unsigned int flags, int offs) { unsigned long param; int ret = 0; int len; if (strcmp(arg, "retval") == 0) { - if (flags & TPARG_FL_RETURN) + if (flags & TPARG_FL_RETURN) { code->op = FETCH_OP_RETVAL; - else + } else { + trace_probe_log_err(offs, RETVAL_ON_PROBE); ret = -EINVAL; + } } else if ((len = str_has_prefix(arg, "stack"))) { if (arg[len] == '\0') { code->op = FETCH_OP_STACKP; } else if (isdigit(arg[len])) { ret = kstrtoul(arg + len, 10, ¶m); - if (ret || ((flags & TPARG_FL_KERNEL) && - param > PARAM_MAX_STACK)) + if (ret) { + goto inval_var; + } else if ((flags & TPARG_FL_KERNEL) && + param > PARAM_MAX_STACK) { + trace_probe_log_err(offs, BAD_STACK_NUM); ret = -EINVAL; - else { + } else { code->op = FETCH_OP_STACK; code->param = (unsigned int)param; } } else - ret = -EINVAL; + goto inval_var; } else if (strcmp(arg, "comm") == 0) { code->op = FETCH_OP_COMM; #ifdef CONFIG_HAVE_FUNCTION_ARG_ACCESS_API } else if (((flags & TPARG_FL_MASK) == (TPARG_FL_KERNEL | TPARG_FL_FENTRY)) && (len = str_has_prefix(arg, "arg"))) { - if (!isdigit(arg[len])) - return -EINVAL; ret = kstrtoul(arg + len, 10, ¶m); - if (ret || !param || param > PARAM_MAX_STACK) + if (ret) { + goto inval_var; + } else if (!param || param > PARAM_MAX_STACK) { + trace_probe_log_err(offs, BAD_ARG_NUM); return -EINVAL; + } code->op = FETCH_OP_ARG; code->param = (unsigned int)param - 1; #endif } else - ret = -EINVAL; + goto inval_var; return ret; + +inval_var: + trace_probe_log_err(offs, BAD_VAR); + return -EINVAL; } /* Recursive argument parser */ static int parse_probe_arg(char *arg, const struct fetch_type *type, struct fetch_insn **pcode, struct fetch_insn *end, - unsigned int flags) + unsigned int flags, int offs) { struct fetch_insn *code = *pcode; unsigned long param; @@ -257,7 +328,7 @@ parse_probe_arg(char *arg, const struct fetch_type *type, switch (arg[0]) { case '$': - ret = parse_probe_vars(arg + 1, type, code, flags); + ret = parse_probe_vars(arg + 1, type, code, flags, offs); break; case '%': /* named register */ @@ -266,47 +337,57 @@ parse_probe_arg(char *arg, const struct fetch_type *type, code->op = FETCH_OP_REG; code->param = (unsigned int)ret; ret = 0; - } + } else + trace_probe_log_err(offs, BAD_REG_NAME); break; case '@': /* memory, file-offset or symbol */ if (isdigit(arg[1])) { ret = kstrtoul(arg + 1, 0, ¶m); - if (ret) + if (ret) { + trace_probe_log_err(offs, BAD_MEM_ADDR); break; + } /* load address */ code->op = FETCH_OP_IMM; code->immediate = param; } else if (arg[1] == '+') { /* kprobes don't support file offsets */ - if (flags & TPARG_FL_KERNEL) + if (flags & TPARG_FL_KERNEL) { + trace_probe_log_err(offs, FILE_ON_KPROBE); return -EINVAL; - + } ret = kstrtol(arg + 2, 0, &offset); - if (ret) + if (ret) { + trace_probe_log_err(offs, BAD_FILE_OFFS); break; + } code->op = FETCH_OP_FOFFS; code->immediate = (unsigned long)offset; // imm64? } else { /* uprobes don't support symbols */ - if (!(flags & TPARG_FL_KERNEL)) + if (!(flags & TPARG_FL_KERNEL)) { + trace_probe_log_err(offs, SYM_ON_UPROBE); return -EINVAL; - + } /* Preserve symbol for updating */ code->op = FETCH_NOP_SYMBOL; code->data = kstrdup(arg + 1, GFP_KERNEL); if (!code->data) return -ENOMEM; - if (++code == end) - return -E2BIG; - + if (++code == end) { + trace_probe_log_err(offs, TOO_MANY_OPS); + return -EINVAL; + } code->op = FETCH_OP_IMM; code->immediate = 0; } /* These are fetching from memory */ - 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; 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) { + trace_probe_log_err(offs, TOO_MANY_OPS); return -EINVAL; - if (++code == end) - return -E2BIG; + } *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; + } 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) - return -E2BIG; + } + 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) diff --git a/kernel/trace/trace_probe.h b/kernel/trace/trace_probe.h index 2177c206de15..b7737666c1a8 100644 --- a/kernel/trace/trace_probe.h +++ b/kernel/trace/trace_probe.h @@ -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) diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c index be78d99ee6bc..cd8750a72768 100644 --- a/kernel/trace/trace_uprobe.c +++ b/kernel/trace/trace_uprobe.c @@ -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; + 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; - pr_info("Invalid reference counter offset.\n"); + 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; } |