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diff --git a/lib/libc/tests/string/Makefile b/lib/libc/tests/string/Makefile
--- a/lib/libc/tests/string/Makefile
+++ b/lib/libc/tests/string/Makefile
@@ -20,6 +20,7 @@
ATF_TESTS_C+= strcspn_test
ATF_TESTS_C+= strerror2_test
ATF_TESTS_C+= strlcpy_test
+ATF_TESTS_C+= strrchr2_test
ATF_TESTS_C+= strspn_test
ATF_TESTS_C+= strverscmp_test
ATF_TESTS_C+= strxfrm_test
@@ -49,6 +50,7 @@
SRCS.memset2_test= memset_test.c
SRCS.strcmp2_test= strcmp_test.c
SRCS.strerror2_test= strerror_test.c
+SRCS.strrchr2_test= strrchr_test.c
.include "../Makefile.netbsd-tests"
diff --git a/lib/libc/tests/string/strrchr_test.c b/lib/libc/tests/string/strrchr_test.c
new file mode 100644
--- /dev/null
+++ b/lib/libc/tests/string/strrchr_test.c
@@ -0,0 +1,137 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2023, 2026 Robert Clausecker <fuz@FreeBSD.org>
+ */
+
+#include <sys/cdefs.h>
+
+#include <dlfcn.h>
+#include <limits.h>
+#include <stdio.h>
+#include <string.h>
+
+#include <atf-c.h>
+
+static char *(*strrchr_fn)(const char *, int);
+
+ATF_TC_WITHOUT_HEAD(nul);
+ATF_TC_BODY(nul, tc)
+{
+ size_t i, j, k;
+ char buf[1+15+64]; /* offset [0+15] + 64 buffer bytes + sentinels */
+
+ buf[0] = '\0';
+ memset(buf + 1, '-', sizeof(buf) - 1);
+
+ for (i = 0; i < 16; i++)
+ for (j = 0; j < 64; j++)
+ for (k = j; k < 64; k++) {
+ buf[i + j + 1] = '\0';
+ buf[i + k + 1] = '\0';
+ ATF_CHECK_EQ(strrchr_fn(buf + i + 1, '\0'), buf + i + j + 1);
+ buf[i + j + 1] = '-';
+ buf[i + k + 1] = '-';
+ }
+}
+
+ATF_TC_WITHOUT_HEAD(not_found);
+ATF_TC_BODY(not_found, tc)
+{
+ size_t i, j;
+ char buf[1+15+64+2]; /* offset [0..15] + 64 buffer bytes + sentinels */
+
+ buf[0] = 'X';
+ memset(buf + 1, '-', sizeof(buf) - 1);
+
+ for (i = 0; i < 16; i++)
+ for (j = 0; j < 64; j++) {
+ buf[i + j + 1] = '\0';
+ buf[i + j + 2] = 'X';
+ ATF_CHECK_EQ(strrchr_fn(buf + i + 1, 'X'), NULL);
+ buf[i + j + 1] = '-';
+ buf[i + j + 2] = '-';
+ }
+}
+
+static void
+do_found_test(char buf[], size_t first, size_t second)
+{
+ /* invariant: first <= second */
+
+ buf[first] = 'X';
+ buf[second] = 'X';
+ ATF_CHECK_EQ(strrchr_fn(buf, 'X'), buf + second);
+ buf[first] = '-';
+ buf[second] = '-';
+}
+
+ATF_TC_WITHOUT_HEAD(found);
+ATF_TC_BODY(found, tc)
+{
+ size_t i, j, k, l;
+ char buf[1+15+64+2];
+
+ buf[0] = 'X';
+ memset(buf + 1, '-', sizeof(buf) - 1);
+
+ for (i = 0; i < 16; i++)
+ for (j = 0; j < 64; j++)
+ for (k = 0; k < j; k++)
+ for (l = 0; l <= k; l++) {
+ buf[i + j + 1] = '\0';
+ buf[i + j + 2] = 'X';
+ do_found_test(buf + i + 1, l, k);
+ buf[i + j + 1] = '-';
+ buf[i + j + 2] = '-';
+ }
+}
+
+/* check that the right character is found */
+static void
+do_values_test(char buf[], size_t len, size_t i, int c)
+{
+ /* sentinels */
+ buf[-1] = c;
+ buf[len] = '\0';
+ buf[len + 1] = 'c';
+
+ memset(buf, c == 255 ? c - 1 : c + 1, len);
+
+ if (i < len) {
+ buf[i] = c;
+ ATF_CHECK_EQ(strrchr_fn(buf, c), buf + i);
+ } else
+ ATF_CHECK_EQ(strrchr_fn(buf, c), c == 0 ? buf + len : NULL);
+}
+
+ATF_TC_WITHOUT_HEAD(values);
+ATF_TC_BODY(values, tc)
+{
+ size_t i, j, k;
+ int c;
+ char buf[1+15+64+2];
+
+ for (i = 0; i < 16; i++)
+ for (j = 0; j < 64; j++)
+ for (k = 0; k <= j; k++)
+ for (c = 0; c <= UCHAR_MAX; c++)
+ do_values_test(buf + i + 1, j, k, c);
+}
+
+ATF_TP_ADD_TCS(tp)
+{
+ void *dl_handle;
+
+ dl_handle = dlopen(NULL, RTLD_LAZY);
+ strrchr_fn = dlsym(dl_handle, "test_strrchr");
+ if (strrchr_fn == NULL)
+ strrchr_fn = strrchr;
+
+ ATF_TP_ADD_TC(tp, nul);
+ ATF_TP_ADD_TC(tp, not_found);
+ ATF_TP_ADD_TC(tp, found);
+ ATF_TP_ADD_TC(tp, values);
+
+ return (atf_no_error());
+}

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