tracing: Use tracing error_log with probe events (ab105a4f) · Commits · 戴 / test

kernel/trace/trace_kprobe.c

+46 −31

Original line number	Diff line number	Diff line
		@@ -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;

kernel/trace/trace_probe.c

+196 −78

Original line number	Diff line number	Diff line
		@@ -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, &param);
		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, &param);
		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, &param);
		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)
		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;
		} 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;
		if (parg->count > MAX_ARRAY_LEN)
		return -E2BIG;
		}
		}
		}
		/*
		@@ -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)

kernel/trace/trace_probe.h

+75 −2

Original line number	Diff line number	Diff line
		@@ -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)

kernel/trace/trace_uprobe.c

+31 −13

Original line number	Diff line number	Diff line
		@@ -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;
		}

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