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* [glibc/azanella/clang] debug: Add fortify wprintf tests
@ 2023-12-21 18:49 Adhemerval Zanella
0 siblings, 0 replies; only message in thread
From: Adhemerval Zanella @ 2023-12-21 18:49 UTC (permalink / raw)
To: glibc-cvs
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=cd76e8322ca4556f916417d3de7e9f729f6f3f5f
commit cd76e8322ca4556f916417d3de7e9f729f6f3f5f
Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date: Mon Dec 4 19:39:36 2023 -0300
debug: Add fortify wprintf tests
Similar to other printf-like ones. It requires to be in a different
process so we can change the orientation of stdout.
Checked on aarch64, armhf, x86_64, and i686.
Diff:
---
debug/Makefile | 2 +
debug/tst-fortify-wide.c | 104 +++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 106 insertions(+)
diff --git a/debug/Makefile b/debug/Makefile
index fdc250e209..ed90ef7030 100644
--- a/debug/Makefile
+++ b/debug/Makefile
@@ -180,6 +180,7 @@ CPPFLAGS-tst-realpath-chk.c += $(no-fortify-source),-D_FORTIFY_SOURCE=2
CPPFLAGS-tst-chk-cancel.c += $(no-fortify-source),-D_FORTIFY_SOURCE=2
CFLAGS-tst-sprintf-fortify-rdonly.c += $(no-fortify-source),-D_FORTIFY_SOURCE=2
CFLAGS-tst-fortify-syslog.c += $(no-fortify-source),-D_FORTIFY_SOURCE=2
+CFLAGS-tst-fortify-wide.c += $(no-fortify-source),-D_FORTIFY_SOURCE=2
# _FORTIFY_SOURCE tests.
# Auto-generate tests for _FORTIFY_SOURCE for different levels, compilers and
@@ -283,6 +284,7 @@ tests = \
tst-backtrace4 \
tst-backtrace5 \
tst-backtrace6 \
+ tst-fortify-wide \
tst-longjmp_chk \
tst-longjmp_chk2 \
tst-realpath-chk \
diff --git a/debug/tst-fortify-wide.c b/debug/tst-fortify-wide.c
new file mode 100644
index 0000000000..6947d04fa6
--- /dev/null
+++ b/debug/tst-fortify-wide.c
@@ -0,0 +1,104 @@
+/* Fortify check for wprintf.
+ Copyright (C) 2004-2023 Free Software Foundation, Inc.
+ Copyright The GNU Toolchain Authors.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+#include <setjmp.h>
+#include <stdio.h>
+#include <wchar.h>
+#include <unistd.h>
+
+#include <support/support.h>
+
+static volatile int chk_fail_ok;
+static volatile int ret;
+static jmp_buf chk_fail_buf;
+
+static void
+handler (int sig)
+{
+ if (chk_fail_ok)
+ {
+ chk_fail_ok = 0;
+ longjmp (chk_fail_buf, 1);
+ }
+ else
+ _exit (127);
+}
+
+static const wchar_t *wstr3 = L"%ls%n%ls%n";
+static const wchar_t *wstr4 = L"Hello, ";
+static const wchar_t *wstr5 = L"World!\n";
+static wchar_t wbuf2[20] = L"%ls";
+
+#define WFAIL \
+ do { wprintf (L"Failure on line %d\n", __LINE__); ret = 1; } while (0)
+#define CHK_FAIL_START \
+ chk_fail_ok = 1; \
+ if (! setjmp (chk_fail_buf)) \
+ {
+#define CHK_FAIL_END \
+ chk_fail_ok = 0; \
+ WFAIL; \
+ }
+
+static int
+do_test (void)
+{
+ set_fortify_handler (handler);
+
+ int n1, n2;
+
+ int orientation = fwide (stdout, 1);
+ if (orientation <= 0)
+ WFAIL;
+
+ /* Constant literals passed directly are always ok
+ (even with warnings about possible bugs from GCC). */
+ if (wprintf (L"%ls%n%ls%n", wstr4, &n1, wstr5, &n2) != 14
+ || n1 != 7 || n2 != 14)
+ WFAIL;
+
+ /* In this case the format string is not known at compile time,
+ but resides in read-only memory, so is ok. */
+ if (wprintf (wstr3, wstr4, &n1, wstr5, &n2) != 14
+ || n1 != 7 || n2 != 14)
+ WFAIL;
+
+ wcpcpy (&wbuf2[3], L"%n%ls%n");
+ /* When the format string is writable and contains %n,
+ with -D_FORTIFY_SOURCE=2 it causes __chk_fail. */
+ CHK_FAIL_START
+ if (wprintf (wbuf2, wstr4, &n1, wstr5, &n1) != 14)
+ WFAIL;
+ CHK_FAIL_END
+
+ /* But if there is no %n, even writable format string
+ should work. */
+ wbuf2[8] = L'\0';
+ if (wprintf (&wbuf2[5], wstr5) != 7)
+ WFAIL;
+
+ /* Check whether missing N$ formats are detected. */
+ CHK_FAIL_START
+ wprintf (L"%3$d\n", 1, 2, 3, 4);
+ CHK_FAIL_END
+
+ return ret;
+}
+
+#include <support/test-driver.c>
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