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Diffstat (limited to 'kernel/trace/trace_probe.c')
-rw-r--r--kernel/trace/trace_probe.c33
1 files changed, 33 insertions, 0 deletions
diff --git a/kernel/trace/trace_probe.c b/kernel/trace/trace_probe.c
index 1d372fa6fefb..74e80a582c28 100644
--- a/kernel/trace/trace_probe.c
+++ b/kernel/trace/trace_probe.c
@@ -218,6 +218,28 @@ free_bitfield_fetch_param(struct bitfield_fetch_param *data)
kfree(data);
}
+void FETCH_FUNC_NAME(comm, string)(struct pt_regs *regs,
+ void *data, void *dest)
+{
+ int maxlen = get_rloc_len(*(u32 *)dest);
+ u8 *dst = get_rloc_data(dest);
+ long ret;
+
+ if (!maxlen)
+ return;
+
+ ret = strlcpy(dst, current->comm, maxlen);
+ *(u32 *)dest = make_data_rloc(ret, get_rloc_offs(*(u32 *)dest));
+}
+NOKPROBE_SYMBOL(FETCH_FUNC_NAME(comm, string));
+
+void FETCH_FUNC_NAME(comm, string_size)(struct pt_regs *regs,
+ void *data, void *dest)
+{
+ *(u32 *)dest = strlen(current->comm) + 1;
+}
+NOKPROBE_SYMBOL(FETCH_FUNC_NAME(comm, string_size));
+
static const struct fetch_type *find_fetch_type(const char *type,
const struct fetch_type *ftbl)
{
@@ -348,6 +370,11 @@ static int parse_probe_vars(char *arg, const struct fetch_type *t,
}
} else
ret = -EINVAL;
+ } else if (strcmp(arg, "comm") == 0) {
+ if (strcmp(t->name, "string") != 0 &&
+ strcmp(t->name, "string_size") != 0)
+ return -EINVAL;
+ f->fn = t->fetch[FETCH_MTD_comm];
} else
ret = -EINVAL;
@@ -522,6 +549,12 @@ int traceprobe_parse_probe_arg(char *arg, ssize_t *size,
arg[t - parg->comm] = '\0';
t++;
}
+ /*
+ * The default type of $comm should be "string", and it can't be
+ * dereferenced.
+ */
+ if (!t && strcmp(arg, "$comm") == 0)
+ t = "string";
parg->type = find_fetch_type(t, ftbl);
if (!parg->type) {
pr_info("Unsupported type: %s\n", t);