[PATCH] debug: test for more required cacellation points (bug 29274)
Adhemerval Zanella
adhemerval.zanella@linaro.org
Thu Jun 23 14:09:08 GMT 2022
> On 23 Jun 2022, at 06:00, Andreas Schwab <schwab@suse.de> wrote:
>
> Generalize the test for cancellation point in __read_chk to also test the
> other fortified functions with required cancellation points.
LGTM, thanks.
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
> ---
> debug/Makefile | 6 +-
> debug/tst-chk-cancel.c | 108 ++++++++++++++++++++++++++++++++++++
> debug/tst-read-chk-cancel.c | 50 -----------------
> 3 files changed, 111 insertions(+), 53 deletions(-)
> create mode 100644 debug/tst-chk-cancel.c
> delete mode 100644 debug/tst-read-chk-cancel.c
>
> diff --git a/debug/Makefile b/debug/Makefile
> index 456b349c4d..99cdf3221b 100644
> --- a/debug/Makefile
> +++ b/debug/Makefile
> @@ -110,7 +110,7 @@ CPPFLAGS-tst-longjmp_chk2.c += -D_FORTIFY_SOURCE=1
> CFLAGS-tst-longjmp_chk3.c += -fexceptions -fasynchronous-unwind-tables
> CPPFLAGS-tst-longjmp_chk3.c += -D_FORTIFY_SOURCE=1
> CPPFLAGS-tst-realpath-chk.c += -D_FORTIFY_SOURCE=2
> -CPPFLAGS-tst-read-chk-cancel.c += -D_FORTIFY_SOURCE=2
> +CPPFLAGS-tst-chk-cancel.c += -D_FORTIFY_SOURCE=2
>
> # _FORTIFY_SOURCE tests.
> # Auto-generate tests for _FORTIFY_SOURCE for different levels, compilers and
> @@ -206,7 +206,7 @@ tests += tst-ssp-1
> endif
>
> ifeq ($(have-thread-library), yes)
> -tests += tst-read-chk-cancel
> +tests += tst-chk-cancel
> endif
>
> ifeq (,$(CXX))
> @@ -248,4 +248,4 @@ $(objpfx)xtrace: xtrace.sh
> -e 's|@REPORT_BUGS_TO@|$(REPORT_BUGS_TO)|' $^ > $@.new \
> && rm -f $@ && mv $@.new $@ && chmod +x $@
>
> -$(objpfx)tst-read-chk-cancel: $(shared-thread-library)
> +$(objpfx)tst-chk-cancel: $(shared-thread-library)
Ok.
> diff --git a/debug/tst-chk-cancel.c b/debug/tst-chk-cancel.c
> new file mode 100644
> index 0000000000..dec85ef067
> --- /dev/null
> +++ b/debug/tst-chk-cancel.c
> @@ -0,0 +1,108 @@
> +/* Test for required cancellation points in fortified functions (BZ #29274)
> + Copyright (C) 2022 Free Software Foundation, Inc.
> + 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 <stdint.h>
> +#include <poll.h>
> +#include <support/xunistd.h>
> +#include <support/xthread.h>
> +
> +static int pipe_fds[2];
> +static pthread_barrier_t barrier;
> +
> +static void *
> +read_thread (void *n)
> +{
> + xpthread_barrier_wait (&barrier);
> + char c;
> + /* This call should be forwarded to __read_chk because the buffer size
> + is known, but the read length is non-constant. */
> + if (read (pipe_fds[0], &c, (uintptr_t) n) != 1)
> + return (void *) -1L;
> + return 0;
> +}
> +
> +static void *
> +pread_thread (void *n)
> +{
> + xpthread_barrier_wait (&barrier);
> + char c;
> + /* This call should be forwarded to __pread_chk because the buffer size
> + is known, but the read length is non-constant. */
> + if (pread (pipe_fds[0], &c, (uintptr_t) n, 0) != 1)
> + return (void *) -1L;
> + return 0;
> +}
> +
> +static void *
> +pread64_thread (void *n)
> +{
> + xpthread_barrier_wait (&barrier);
> + char c;
> + /* This call should be forwarded to __pread64_chk because the buffer size
> + is known, but the read length is non-constant. */
> + if (pread64 (pipe_fds[0], &c, (uintptr_t) n, 0) != 1)
> + return (void *) -1L;
> + return 0;
> +}
> +
> +static void *
> +poll_thread (void *n)
> +{
> + xpthread_barrier_wait (&barrier);
> + struct pollfd pfd = { pipe_fds[0], POLLIN, 0 };
> + /* This call should be forwarded to __poll_chk because the pollfd size
> + is known, but the number of entries is non-constant. */
> + if (poll (&pfd, (uintptr_t) n, -1) != 1)
> + return (void *) -1L;
> + return 0;
> +}
> +
> +static void *
> +ppoll_thread (void *n)
> +{
> + xpthread_barrier_wait (&barrier);
> + struct pollfd pfd = { pipe_fds[0], POLLIN, 0 };
> + /* This call should be forwarded to __ppoll_chk because the pollfd size
> + is known, but the number of entries is non-constant. */
> + if (ppoll (&pfd, (uintptr_t) n, 0, 0) != 1)
> + return (void *) -1L;
> + return 0;
> +}
> +
> +static void *(*thread_fct[]) (void *) =
> + {
> + read_thread, pread_thread, pread64_thread, poll_thread, ppoll_thread
> + };
> +
> +static int
> +do_test (void)
> +{
> + xpthread_barrier_init (&barrier, 0, 2);
> + xpipe (pipe_fds);
> + for (int i = 0; i < sizeof (thread_fct) / sizeof (thread_fct[0]); i++)
> + {
> + pthread_t thr = xpthread_create (0, thread_fct[i], (void *) 1L);
> + xpthread_barrier_wait (&barrier);
> + xpthread_cancel (thr);
> + xpthread_join (thr);
> + }
> + xpthread_barrier_destroy (&barrier);
> + return 0;
> +}
> +
> +#include <support/test-driver.c>
Ok.
> diff --git a/debug/tst-read-chk-cancel.c b/debug/tst-read-chk-cancel.c
> deleted file mode 100644
> index 7e06afb596..0000000000
> --- a/debug/tst-read-chk-cancel.c
> +++ /dev/null
> @@ -1,50 +0,0 @@
> -/* Test that __read_chk is a cancellation point (BZ #29274)
> - Copyright (C) 2022 Free Software Foundation, Inc.
> - 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 <stdint.h>
> -#include <support/xunistd.h>
> -#include <support/xthread.h>
> -
> -static int pipe_fds[2];
> -static pthread_barrier_t barrier;
> -
> -static void *
> -read_thread (void *n)
> -{
> - xpthread_barrier_wait (&barrier);
> - char c;
> - /* This call should be forwarded to __read_chk because the buffer size
> - is known, but the read length is non-constant. */
> - if (read (pipe_fds[0], &c, (uintptr_t) n) != 1)
> - return (void *) -1L;
> - return 0;
> -}
> -
> -static int
> -do_test (void)
> -{
> - xpthread_barrier_init (&barrier, 0, 2);
> - xpipe (pipe_fds);
> - pthread_t thr = xpthread_create (0, read_thread, (void *) 1L);
> - xpthread_barrier_wait (&barrier);
> - xpthread_cancel (thr);
> - xpthread_join (thr);
> - return 0;
> -}
> -
> -#include <support/test-driver.c>
> --
> 2.35.3
>
Ok.
>
> --
> Andreas Schwab, SUSE Labs, schwab@suse.de
> GPG Key fingerprint = 0196 BAD8 1CE9 1970 F4BE 1748 E4D4 88E3 0EEA B9D7
> "And now for something completely different."
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