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Diffstat (limited to 'nptl/tst-cancel31.c')
-rw-r--r-- | nptl/tst-cancel31.c | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/nptl/tst-cancel31.c b/nptl/tst-cancel31.c new file mode 100644 index 0000000000..f9cc8245e1 --- /dev/null +++ b/nptl/tst-cancel31.c @@ -0,0 +1,100 @@ +/* Verify side-effects of cancellable syscalls (BZ #12683). + Copyright (C) 2023 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/>. */ + +/* This testcase checks if there is resource leakage if the syscall has + returned from kernelspace, but before userspace saves the return + value. The 'leaker' thread should be able to close the file descriptor + if the resource is already allocated, meaning that if the cancellation + signal arrives *after* the open syscal return from kernel, the + side-effect should be visible to application. */ + +#include <sys/types.h> +#include <sys/stat.h> +#include <fcntl.h> +#include <unistd.h> +#include <stdlib.h> + +#include <support/xunistd.h> +#include <support/xthread.h> +#include <support/check.h> +#include <support/temp_file.h> +#include <support/support.h> +#include <support/descriptors.h> + +static void * +writeopener (void *arg) +{ + int fd; + for (;;) + { + fd = open (arg, O_WRONLY); + xclose (fd); + } + return NULL; +} + +static void * +leaker (void *arg) +{ + int fd = open (arg, O_RDONLY); + TEST_VERIFY_EXIT (fd > 0); + pthread_setcancelstate (PTHREAD_CANCEL_DISABLE, 0); + xclose (fd); + return NULL; +} + +static int +do_test (void) +{ + enum { + iter_count = 1000 + }; + + char *dir = support_create_temp_directory ("tst-cancel28"); + char *name = xasprintf ("%s/fifo", dir); + TEST_COMPARE (mkfifo (name, 0600), 0); + add_temp_file (name); + + struct support_descriptors *descrs = support_descriptors_list (); + + srand (1); + + xpthread_create (NULL, writeopener, name); + for (int i = 0; i < iter_count; i++) + { + pthread_t td = xpthread_create (NULL, leaker, name); + struct timespec ts = + { .tv_nsec = rand () % 100000, .tv_sec = 0 }; + nanosleep (&ts, NULL); + /* Ignore pthread_cancel result because it might be the + case when pthread_cancel is called when thread is already + exited. */ + pthread_cancel (td); + xpthread_join (td); + } + + support_descriptors_check (descrs); + + support_descriptors_free (descrs); + + free (name); + + return 0; +} + +#include <support/test-driver.c> |