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-rw-r--r--kernel/trace/trace_kprobe.c9
-rw-r--r--kernel/trace/trace_probe.c47
-rw-r--r--kernel/trace/trace_probe.h2
-rw-r--r--kernel/trace/trace_uprobe.c9
4 files changed, 31 insertions, 36 deletions
diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index 82c3b86013b2..ed1e3c2087ab 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -873,15 +873,8 @@ static int __trace_kprobe_create(int argc, const char *argv[])
/* parse arguments */
for (i = 0; i < argc && i < MAX_TRACE_ARGS; i++) {
- tmp = kstrdup(argv[i], GFP_KERNEL);
- if (!tmp) {
- ret = -ENOMEM;
- goto error;
- }
-
trace_probe_log_set_index(i + 2);
- ret = traceprobe_parse_probe_arg(&tk->tp, i, tmp, flags);
- kfree(tmp);
+ ret = traceprobe_parse_probe_arg(&tk->tp, i, argv[i], flags);
if (ret)
goto error; /* This can be -ENOMEM */
}
diff --git a/kernel/trace/trace_probe.c b/kernel/trace/trace_probe.c
index 15413ad7cef2..ef717b373443 100644
--- a/kernel/trace/trace_probe.c
+++ b/kernel/trace/trace_probe.c
@@ -540,26 +540,34 @@ 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,
+static int traceprobe_parse_probe_arg_body(const char *argv, ssize_t *size,
struct probe_arg *parg, unsigned int flags, int offset)
{
struct fetch_insn *code, *scode, *tmp = NULL;
char *t, *t2, *t3;
+ char *arg;
int ret, len;
+ arg = kstrdup(argv, GFP_KERNEL);
+ if (!arg)
+ return -ENOMEM;
+
+ ret = -EINVAL;
len = strlen(arg);
if (len > MAX_ARGSTR_LEN) {
trace_probe_log_err(offset, ARG_TOO_LONG);
- return -EINVAL;
+ goto out;
} else if (len == 0) {
trace_probe_log_err(offset, NO_ARG_BODY);
- return -EINVAL;
+ goto out;
}
+ ret = -ENOMEM;
parg->comm = kstrdup(arg, GFP_KERNEL);
if (!parg->comm)
- return -ENOMEM;
+ goto out;
+ ret = -EINVAL;
t = strchr(arg, ':');
if (t) {
*t = '\0';
@@ -571,22 +579,22 @@ static int traceprobe_parse_probe_arg_body(char *arg, ssize_t *size,
offset += t2 + strlen(t2) - arg;
trace_probe_log_err(offset,
ARRAY_NO_CLOSE);
- return -EINVAL;
+ goto out;
} else if (t3[1] != '\0') {
trace_probe_log_err(offset + t3 + 1 - arg,
BAD_ARRAY_SUFFIX);
- return -EINVAL;
+ goto out;
}
*t3 = '\0';
if (kstrtouint(t2, 0, &parg->count) || !parg->count) {
trace_probe_log_err(offset + t2 - arg,
BAD_ARRAY_NUM);
- return -EINVAL;
+ goto out;
}
if (parg->count > MAX_ARRAY_LEN) {
trace_probe_log_err(offset + t2 - arg,
ARRAY_TOO_BIG);
- return -EINVAL;
+ goto out;
}
}
}
@@ -598,29 +606,30 @@ static int traceprobe_parse_probe_arg_body(char *arg, ssize_t *size,
if (strcmp(arg, "$comm") == 0 || strncmp(arg, "\\\"", 2) == 0) {
/* The type of $comm must be "string", and not an array. */
if (parg->count || (t && strcmp(t, "string")))
- return -EINVAL;
+ goto out;
parg->type = find_fetch_type("string");
} else
parg->type = find_fetch_type(t);
if (!parg->type) {
trace_probe_log_err(offset + (t ? (t - arg) : 0), BAD_TYPE);
- return -EINVAL;
+ goto out;
}
parg->offset = *size;
*size += parg->type->size * (parg->count ?: 1);
+ ret = -ENOMEM;
if (parg->count) {
len = strlen(parg->type->fmttype) + 6;
parg->fmt = kmalloc(len, GFP_KERNEL);
if (!parg->fmt)
- return -ENOMEM;
+ goto out;
snprintf(parg->fmt, len, "%s[%d]", parg->type->fmttype,
parg->count);
}
code = tmp = kcalloc(FETCH_INSN_MAX, sizeof(*code), GFP_KERNEL);
if (!code)
- return -ENOMEM;
+ goto out;
code[FETCH_INSN_MAX - 1].op = FETCH_OP_END;
ret = parse_probe_arg(arg, parg->type, &code, &code[FETCH_INSN_MAX - 1],
@@ -628,6 +637,7 @@ static int traceprobe_parse_probe_arg_body(char *arg, ssize_t *size,
if (ret)
goto fail;
+ ret = -EINVAL;
/* Store operation */
if (!strcmp(parg->type->name, "string") ||
!strcmp(parg->type->name, "ustring")) {
@@ -636,7 +646,6 @@ static int traceprobe_parse_probe_arg_body(char *arg, ssize_t *size,
code->op != FETCH_OP_DATA) {
trace_probe_log_err(offset + (t ? (t - arg) : 0),
BAD_STRING);
- ret = -EINVAL;
goto fail;
}
if ((code->op == FETCH_OP_IMM || code->op == FETCH_OP_COMM ||
@@ -650,7 +659,6 @@ static int traceprobe_parse_probe_arg_body(char *arg, ssize_t *size,
code++;
if (code->op != FETCH_OP_NOP) {
trace_probe_log_err(offset, TOO_MANY_OPS);
- ret = -EINVAL;
goto fail;
}
}
@@ -672,7 +680,6 @@ static int traceprobe_parse_probe_arg_body(char *arg, ssize_t *size,
code++;
if (code->op != FETCH_OP_NOP) {
trace_probe_log_err(offset, TOO_MANY_OPS);
- ret = -EINVAL;
goto fail;
}
code->op = FETCH_OP_ST_RAW;
@@ -687,6 +694,7 @@ static int traceprobe_parse_probe_arg_body(char *arg, ssize_t *size,
goto fail;
}
}
+ ret = -EINVAL;
/* Loop(Array) operation */
if (parg->count) {
if (scode->op != FETCH_OP_ST_MEM &&
@@ -694,13 +702,11 @@ static int traceprobe_parse_probe_arg_body(char *arg, ssize_t *size,
scode->op != FETCH_OP_ST_USTRING) {
trace_probe_log_err(offset + (t ? (t - arg) : 0),
BAD_STRING);
- ret = -EINVAL;
goto fail;
}
code++;
if (code->op != FETCH_OP_NOP) {
trace_probe_log_err(offset, TOO_MANY_OPS);
- ret = -EINVAL;
goto fail;
}
code->op = FETCH_OP_LP_ARRAY;
@@ -709,6 +715,7 @@ static int traceprobe_parse_probe_arg_body(char *arg, ssize_t *size,
code++;
code->op = FETCH_OP_END;
+ ret = 0;
/* Shrink down the code buffer */
parg->code = kcalloc(code - tmp + 1, sizeof(*code), GFP_KERNEL);
if (!parg->code)
@@ -724,6 +731,8 @@ fail:
kfree(code->data);
}
kfree(tmp);
+out:
+ kfree(arg);
return ret;
}
@@ -745,11 +754,11 @@ static int traceprobe_conflict_field_name(const char *name,
return 0;
}
-int traceprobe_parse_probe_arg(struct trace_probe *tp, int i, char *arg,
+int traceprobe_parse_probe_arg(struct trace_probe *tp, int i, const char *arg,
unsigned int flags)
{
struct probe_arg *parg = &tp->args[i];
- char *body;
+ const char *body;
/* Increment count for freeing args in error case */
tp->nr_args++;
diff --git a/kernel/trace/trace_probe.h b/kernel/trace/trace_probe.h
index 227d518e5ba5..42aa084902fa 100644
--- a/kernel/trace/trace_probe.h
+++ b/kernel/trace/trace_probe.h
@@ -354,7 +354,7 @@ int trace_probe_create(const char *raw_command, int (*createfn)(int, const char
#define TPARG_FL_MASK GENMASK(2, 0)
extern int traceprobe_parse_probe_arg(struct trace_probe *tp, int i,
- char *arg, unsigned int flags);
+ const char *argv, unsigned int flags);
extern int traceprobe_update_arg(struct probe_arg *arg);
extern void traceprobe_free_probe_arg(struct probe_arg *arg);
diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c
index 1e2a92e7607d..93ff96541971 100644
--- a/kernel/trace/trace_uprobe.c
+++ b/kernel/trace/trace_uprobe.c
@@ -684,16 +684,9 @@ static int __trace_uprobe_create(int argc, const char **argv)
/* parse arguments */
for (i = 0; i < argc && i < MAX_TRACE_ARGS; i++) {
- tmp = kstrdup(argv[i], GFP_KERNEL);
- if (!tmp) {
- ret = -ENOMEM;
- goto error;
- }
-
trace_probe_log_set_index(i + 2);
- ret = traceprobe_parse_probe_arg(&tu->tp, i, tmp,
+ ret = traceprobe_parse_probe_arg(&tu->tp, i, argv[i],
is_return ? TPARG_FL_RETURN : 0);
- kfree(tmp);
if (ret)
goto error;
}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.