libc/fortify_uio_test: replace stdin in base readv tests

This fixes the readv_before_end and preadv_before_end test
timeout failures on riscv.

See https://ci.freebsd.org/job/FreeBSD-main-riscv64-test/lastCompletedBuild/testReport/lib.libc.secure/fortify_uio_test/readv_before_end/

Reviewed by:	kevans, emaste
MFC after:	3 days
Differential Revision:	https://reviews.freebsd.org/D57420

lib/libc/tests/secure/fortify_uio_test.c

@@ -179,6 +179,8 @@ ATF_TC_BODY(readv_before_end, tc)
 	const size_t __len = 2 - 1;
 	const size_t __idx __unused = __len - 1;
 
+	replace_stdin();
+
 	readv(STDIN_FILENO, __stack.__buf, __len);
 #undef BUF
 
@@ -200,6 +202,8 @@ ATF_TC_BODY(readv_end, tc)
 	const size_t __len = 2;
 	const size_t __idx __unused = __len - 1;
 
+	replace_stdin();
+
 	readv(STDIN_FILENO, __stack.__buf, __len);
 #undef BUF
 
@@ -230,6 +234,8 @@ ATF_TC_BODY(readv_after_end, tc)
 
 	/* Child */
 	disable_coredumps();
+	replace_stdin();
+
 	readv(STDIN_FILENO, __stack.__buf, __len);
 	_exit(EX_SOFTWARE);	/* Should have aborted. */
 
@@ -274,6 +280,7 @@ ATF_TC_BODY(readv_heap_before_end, tc)
 	const size_t __idx __unused = __len - 1;
 
 	__stack.__buf = malloc(__bufsz);
+	replace_stdin();
 
 	readv(STDIN_FILENO, __stack.__buf, __len);
 #undef BUF
@@ -297,6 +304,7 @@ ATF_TC_BODY(readv_heap_end, tc)
 	const size_t __idx __unused = __len - 1;
 
 	__stack.__buf = malloc(__bufsz);
+	replace_stdin();
 
 	readv(STDIN_FILENO, __stack.__buf, __len);
 #undef BUF
@@ -329,6 +337,7 @@ ATF_TC_BODY(readv_heap_after_end, tc)
 	/* Child */
 	disable_coredumps();
 	__stack.__buf = malloc(__bufsz);
+	replace_stdin();
 
 	readv(STDIN_FILENO, __stack.__buf, __len);
 	_exit(EX_SOFTWARE);	/* Should have aborted. */
@@ -542,6 +551,8 @@ ATF_TC_BODY(preadv_before_end, tc)
 	const size_t __len = 2 - 1;
 	const size_t __idx __unused = __len - 1;
 
+	replace_stdin();
+
 	preadv(STDIN_FILENO, __stack.__buf, __len, 0);
 #undef BUF
 
@@ -563,6 +574,8 @@ ATF_TC_BODY(preadv_end, tc)
 	const size_t __len = 2;
 	const size_t __idx __unused = __len - 1;
 
+	replace_stdin();
+
 	preadv(STDIN_FILENO, __stack.__buf, __len, 0);
 #undef BUF
 
@@ -593,6 +606,8 @@ ATF_TC_BODY(preadv_after_end, tc)
 
 	/* Child */
 	disable_coredumps();
+	replace_stdin();
+
 	preadv(STDIN_FILENO, __stack.__buf, __len, 0);
 	_exit(EX_SOFTWARE);	/* Should have aborted. */
 
@@ -637,6 +652,7 @@ ATF_TC_BODY(preadv_heap_before_end, tc)
 	const size_t __idx __unused = __len - 1;
 
 	__stack.__buf = malloc(__bufsz);
+	replace_stdin();
 
 	preadv(STDIN_FILENO, __stack.__buf, __len, 0);
 #undef BUF
@@ -660,6 +676,7 @@ ATF_TC_BODY(preadv_heap_end, tc)
 	const size_t __idx __unused = __len - 1;
 
 	__stack.__buf = malloc(__bufsz);
+	replace_stdin();
 
 	preadv(STDIN_FILENO, __stack.__buf, __len, 0);
 #undef BUF
@@ -692,6 +709,7 @@ ATF_TC_BODY(preadv_heap_after_end, tc)
 	/* Child */
 	disable_coredumps();
 	__stack.__buf = malloc(__bufsz);
+	replace_stdin();
 
 	preadv(STDIN_FILENO, __stack.__buf, __len, 0);
 	_exit(EX_SOFTWARE);	/* Should have aborted. */

lib/libc/tests/secure/generate-fortify-tests.lua

@@ -411,6 +411,7 @@ local all_tests = {
 				"__buf",
 				"__len",
 			},
+			init = stdio_init,
 		},
 		{
 			func = "readv",
@@ -435,6 +436,7 @@ local all_tests = {
 				"__len",
 				"0",
 			},
+			init = stdio_init,
 		},
 		{
 			func = "preadv",