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92 lines
3.5 KiB
92 lines
3.5 KiB
2 years ago
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commit 10f7bdebe570e42d1f7a43de4f90eda8ccb4f0da
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Author: Siddhesh Poyarekar <siddhesh@sourceware.org>
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Date: Fri Dec 17 18:35:44 2021 +0530
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fortify: Fix spurious warning with realpath
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The length and object size arguments were swapped around for realpath.
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Also add a smoke test so that any changes in this area get caught in
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future.
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Signed-off-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
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Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
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(cherry picked from commit 2bbd07c715275eb6c616988925738a0517180d57)
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diff --git a/debug/Makefile b/debug/Makefile
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index 357f888246061e15..bc37e466eed490fa 100644
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--- a/debug/Makefile
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+++ b/debug/Makefile
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@@ -108,6 +108,7 @@ CFLAGS-tst-longjmp_chk2.c += -fexceptions -fasynchronous-unwind-tables
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CPPFLAGS-tst-longjmp_chk2.c += -D_FORTIFY_SOURCE=1
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CFLAGS-tst-longjmp_chk3.c += -fexceptions -fasynchronous-unwind-tables
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CPPFLAGS-tst-longjmp_chk3.c += -D_FORTIFY_SOURCE=1
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+CPPFLAGS-tst-realpath-chk.c += -D_FORTIFY_SOURCE=2
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# We know these tests have problems with format strings, this is what
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# we are testing. Disable that warning. They are also testing
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@@ -155,7 +156,7 @@ tests = backtrace-tst tst-longjmp_chk tst-chk1 tst-chk2 tst-chk3 \
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tst-lfschk1 tst-lfschk2 tst-lfschk3 test-strcpy_chk test-stpcpy_chk \
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tst-chk4 tst-chk5 tst-chk6 tst-chk7 tst-chk8 tst-lfschk4 tst-lfschk5 \
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tst-lfschk6 tst-longjmp_chk2 tst-backtrace2 tst-backtrace3 \
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- tst-backtrace4 tst-backtrace5 tst-backtrace6
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+ tst-backtrace4 tst-backtrace5 tst-backtrace6 tst-realpath-chk
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ifeq ($(have-ssp),yes)
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tests += tst-ssp-1
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diff --git a/debug/tst-realpath-chk.c b/debug/tst-realpath-chk.c
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new file mode 100644
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index 0000000000000000..a8fcb327c43fb34d
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--- /dev/null
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+++ b/debug/tst-realpath-chk.c
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@@ -0,0 +1,37 @@
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+/* Smoke test to verify that realpath does not cause spurious warnings.
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+ Copyright The GNU Toolchain Authors.
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+ This file is part of the GNU C Library.
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+
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+ The GNU C Library is free software; you can redistribute it and/or
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+ modify it under the terms of the GNU Lesser General Public
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+ License as published by the Free Software Foundation; either
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+ version 2.1 of the License, or (at your option) any later version.
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+
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+ The GNU C Library is distributed in the hope that it will be useful,
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+ but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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+ Lesser General Public License for more details.
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+
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+ You should have received a copy of the GNU Lesser General Public
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+ License along with the GNU C Library; if not, see
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+ <https://www.gnu.org/licenses/>. */
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+
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+#include <limits.h>
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+#include <stdlib.h>
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+
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+#include <support/check.h>
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+#include <support/support.h>
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+
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+static int
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+do_test (void)
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+{
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+#ifdef PATH_MAX
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+ char buf[PATH_MAX + 1];
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+ char *res = realpath (".", buf);
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+ TEST_VERIFY (res == buf);
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+#endif
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+
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+ return 0;
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+}
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+
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+#include <support/test-driver.c>
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diff --git a/stdlib/bits/stdlib.h b/stdlib/bits/stdlib.h
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index 067115eeca123c6d..ccacbdf76a08225a 100644
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--- a/stdlib/bits/stdlib.h
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+++ b/stdlib/bits/stdlib.h
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@@ -42,7 +42,7 @@ __NTH (realpath (const char *__restrict __name, char *__restrict __resolved))
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return __realpath_alias (__name, __resolved);
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#if defined _LIBC_LIMITS_H_ && defined PATH_MAX
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- if (__glibc_unsafe_len (sz, sizeof (char), PATH_MAX))
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+ if (__glibc_unsafe_len (PATH_MAX, sizeof (char), sz))
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return __realpath_chk_warn (__name, __resolved, sz);
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#endif
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return __realpath_chk (__name, __resolved, sz);
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