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Diffstat (limited to 'kernel/trace/trace_probe.c')
-rw-r--r--kernel/trace/trace_probe.c65
1 files changed, 42 insertions, 23 deletions
diff --git a/kernel/trace/trace_probe.c b/kernel/trace/trace_probe.c
index bb2f95d7175c..01ebabbbe8c9 100644
--- a/kernel/trace/trace_probe.c
+++ b/kernel/trace/trace_probe.c
@@ -76,9 +76,11 @@ const char PRINT_TYPE_FMT_NAME(string)[] = "\\\"%s\\\"";
/* Fetch type information table */
static const struct fetch_type probe_fetch_types[] = {
/* Special types */
- __ASSIGN_FETCH_TYPE("string", string, string, sizeof(u32), 1,
+ __ASSIGN_FETCH_TYPE("string", string, string, sizeof(u32), 1, 1,
"__data_loc char[]"),
- __ASSIGN_FETCH_TYPE("ustring", string, string, sizeof(u32), 1,
+ __ASSIGN_FETCH_TYPE("ustring", string, string, sizeof(u32), 1, 1,
+ "__data_loc char[]"),
+ __ASSIGN_FETCH_TYPE("symstr", string, string, sizeof(u32), 1, 1,
"__data_loc char[]"),
/* Basic types */
ASSIGN_FETCH_TYPE(u8, u8, 0),
@@ -98,10 +100,15 @@ static const struct fetch_type probe_fetch_types[] = {
ASSIGN_FETCH_TYPE_END
};
-static const struct fetch_type *find_fetch_type(const char *type)
+static const struct fetch_type *find_fetch_type(const char *type, unsigned long flags)
{
int i;
+ /* Reject the symbol/symstr for uprobes */
+ if (type && (flags & TPARG_FL_USER) &&
+ (!strcmp(type, "symbol") || !strcmp(type, "symstr")))
+ return NULL;
+
if (!type)
type = DEFAULT_FETCH_TYPE_STR;
@@ -119,13 +126,13 @@ static const struct fetch_type *find_fetch_type(const char *type)
switch (bs) {
case 8:
- return find_fetch_type("u8");
+ return find_fetch_type("u8", flags);
case 16:
- return find_fetch_type("u16");
+ return find_fetch_type("u16", flags);
case 32:
- return find_fetch_type("u32");
+ return find_fetch_type("u32", flags);
case 64:
- return find_fetch_type("u64");
+ return find_fetch_type("u64", flags);
default:
goto fail;
}
@@ -478,7 +485,7 @@ parse_probe_arg(char *arg, const struct fetch_type *type,
DEREF_OPEN_BRACE);
return -EINVAL;
} else {
- const struct fetch_type *t2 = find_fetch_type(NULL);
+ const struct fetch_type *t2 = find_fetch_type(NULL, flags);
*tmp = '\0';
ret = parse_probe_arg(arg, t2, &code, end, flags, offs);
@@ -630,9 +637,9 @@ static int traceprobe_parse_probe_arg_body(const char *argv, ssize_t *size,
/* The type of $comm must be "string", and not an array. */
if (parg->count || (t && strcmp(t, "string")))
goto out;
- parg->type = find_fetch_type("string");
+ parg->type = find_fetch_type("string", flags);
} else
- parg->type = find_fetch_type(t);
+ parg->type = find_fetch_type(t, flags);
if (!parg->type) {
trace_probe_log_err(offset + (t ? (t - arg) : 0), BAD_TYPE);
goto out;
@@ -662,16 +669,26 @@ static int traceprobe_parse_probe_arg_body(const char *argv, ssize_t *size,
ret = -EINVAL;
/* Store operation */
- if (!strcmp(parg->type->name, "string") ||
- !strcmp(parg->type->name, "ustring")) {
- if (code->op != FETCH_OP_DEREF && code->op != FETCH_OP_UDEREF &&
- code->op != FETCH_OP_IMM && code->op != FETCH_OP_COMM &&
- code->op != FETCH_OP_DATA && code->op != FETCH_OP_TP_ARG) {
- trace_probe_log_err(offset + (t ? (t - arg) : 0),
- BAD_STRING);
- goto fail;
+ if (parg->type->is_string) {
+ if (!strcmp(parg->type->name, "symstr")) {
+ if (code->op != FETCH_OP_REG && code->op != FETCH_OP_STACK &&
+ code->op != FETCH_OP_RETVAL && code->op != FETCH_OP_ARG &&
+ code->op != FETCH_OP_DEREF && code->op != FETCH_OP_TP_ARG) {
+ trace_probe_log_err(offset + (t ? (t - arg) : 0),
+ BAD_SYMSTRING);
+ goto fail;
+ }
+ } else {
+ if (code->op != FETCH_OP_DEREF && code->op != FETCH_OP_UDEREF &&
+ code->op != FETCH_OP_IMM && code->op != FETCH_OP_COMM &&
+ code->op != FETCH_OP_DATA && code->op != FETCH_OP_TP_ARG) {
+ trace_probe_log_err(offset + (t ? (t - arg) : 0),
+ BAD_STRING);
+ goto fail;
+ }
}
- if ((code->op == FETCH_OP_IMM || code->op == FETCH_OP_COMM ||
+ if (!strcmp(parg->type->name, "symstr") ||
+ (code->op == FETCH_OP_IMM || code->op == FETCH_OP_COMM ||
code->op == FETCH_OP_DATA) || code->op == FETCH_OP_TP_ARG ||
parg->count) {
/*
@@ -679,6 +696,8 @@ static int traceprobe_parse_probe_arg_body(const char *argv, ssize_t *size,
* must be kept, and if parg->count != 0, this is an
* array of string pointers instead of string address
* itself.
+ * For the symstr, it doesn't need to dereference, thus
+ * it just get the value.
*/
code++;
if (code->op != FETCH_OP_NOP) {
@@ -690,6 +709,8 @@ static int traceprobe_parse_probe_arg_body(const char *argv, ssize_t *size,
if (!strcmp(parg->type->name, "ustring") ||
code->op == FETCH_OP_UDEREF)
code->op = FETCH_OP_ST_USTRING;
+ else if (!strcmp(parg->type->name, "symstr"))
+ code->op = FETCH_OP_ST_SYMSTR;
else
code->op = FETCH_OP_ST_STRING;
code->size = parg->type->size;
@@ -919,8 +940,7 @@ static int __set_print_fmt(struct trace_probe *tp, char *buf, int len,
for (i = 0; i < tp->nr_args; i++) {
parg = tp->args + i;
if (parg->count) {
- if ((strcmp(parg->type->name, "string") == 0) ||
- (strcmp(parg->type->name, "ustring") == 0))
+ if (parg->type->is_string)
fmt = ", __get_str(%s[%d])";
else
fmt = ", REC->%s[%d]";
@@ -928,8 +948,7 @@ static int __set_print_fmt(struct trace_probe *tp, char *buf, int len,
pos += snprintf(buf + pos, LEN_OR_ZERO,
fmt, parg->name, j);
} else {
- if ((strcmp(parg->type->name, "string") == 0) ||
- (strcmp(parg->type->name, "ustring") == 0))
+ if (parg->type->is_string)
fmt = ", __get_str(%s)";
else
fmt = ", REC->%s";
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-18 12:15:49 +0100