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Diffstat (limited to 'tools/testing/selftests/bpf/test_sockmap.c')
-rw-r--r--tools/testing/selftests/bpf/test_sockmap.c36
1 files changed, 23 insertions, 13 deletions
diff --git a/tools/testing/selftests/bpf/test_sockmap.c b/tools/testing/selftests/bpf/test_sockmap.c
index 0fa1e421c3d7..427ca00a3217 100644
--- a/tools/testing/selftests/bpf/test_sockmap.c
+++ b/tools/testing/selftests/bpf/test_sockmap.c
@@ -1273,6 +1273,16 @@ static char *test_to_str(int test)
return "unknown";
}
+static void append_str(char *dst, const char *src, size_t dst_cap)
+{
+ size_t avail = dst_cap - strlen(dst);
+
+ if (avail <= 1) /* just zero byte could be written */
+ return;
+
+ strncat(dst, src, avail - 1); /* strncat() adds + 1 for zero byte */
+}
+
#define OPTSTRING 60
static void test_options(char *options)
{
@@ -1281,42 +1291,42 @@ static void test_options(char *options)
memset(options, 0, OPTSTRING);
if (txmsg_pass)
- strncat(options, "pass,", OPTSTRING);
+ append_str(options, "pass,", OPTSTRING);
if (txmsg_redir)
- strncat(options, "redir,", OPTSTRING);
+ append_str(options, "redir,", OPTSTRING);
if (txmsg_drop)
- strncat(options, "drop,", OPTSTRING);
+ append_str(options, "drop,", OPTSTRING);
if (txmsg_apply) {
snprintf(tstr, OPTSTRING, "apply %d,", txmsg_apply);
- strncat(options, tstr, OPTSTRING);
+ append_str(options, tstr, OPTSTRING);
}
if (txmsg_cork) {
snprintf(tstr, OPTSTRING, "cork %d,", txmsg_cork);
- strncat(options, tstr, OPTSTRING);
+ append_str(options, tstr, OPTSTRING);
}
if (txmsg_start) {
snprintf(tstr, OPTSTRING, "start %d,", txmsg_start);
- strncat(options, tstr, OPTSTRING);
+ append_str(options, tstr, OPTSTRING);
}
if (txmsg_end) {
snprintf(tstr, OPTSTRING, "end %d,", txmsg_end);
- strncat(options, tstr, OPTSTRING);
+ append_str(options, tstr, OPTSTRING);
}
if (txmsg_start_pop) {
snprintf(tstr, OPTSTRING, "pop (%d,%d),",
txmsg_start_pop, txmsg_start_pop + txmsg_pop);
- strncat(options, tstr, OPTSTRING);
+ append_str(options, tstr, OPTSTRING);
}
if (txmsg_ingress)
- strncat(options, "ingress,", OPTSTRING);
+ append_str(options, "ingress,", OPTSTRING);
if (txmsg_redir_skb)
- strncat(options, "redir_skb,", OPTSTRING);
+ append_str(options, "redir_skb,", OPTSTRING);
if (txmsg_ktls_skb)
- strncat(options, "ktls_skb,", OPTSTRING);
+ append_str(options, "ktls_skb,", OPTSTRING);
if (ktls)
- strncat(options, "ktls,", OPTSTRING);
+ append_str(options, "ktls,", OPTSTRING);
if (peek_flag)
- strncat(options, "peek,", OPTSTRING);
+ append_str(options, "peek,", OPTSTRING);
}
static int __test_exec(int cgrp, int test, struct sockmap_options *opt)