Hi Andrea,
generally LGTM.
With using .skip_in_compat and SPDX GPL-2.0-only:
Reviewed-by: Petr Vorel <pvorel@suse.cz>
Minor notes below.
> ---
> Reverted SAFE_MMAP to mmap
> Added kernel tags
+1
> testcases/kernel/syscalls/fork/fork14.c | 208 +++++++++++-------------
...
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +/*
> * Copyright (C) 2014 Red Hat, Inc.
> + * Copyright (C) 2023 SUSE LLC Andrea Cervesato <andrea.cervesato@suse.com>
> + */
> +
> +/*\
> + * [Description]
> *
> - * This program is free software; you can redistribute it and/or
> - * modify it under the terms of version 2 of the GNU General Public
> - * License as published by the Free Software Foundation.
This is GPL-2.0-only.
> - *
> - * This program is distributed in the hope that it would be useful,
> - * but WITHOUT ANY WARRANTY; without even the implied warranty of
> - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
> - *
> - * Further, this software is distributed without any warranty that it
> - * is free of the rightful claim of any third person regarding
> - * infringement or the like. Any license provided herein, whether
> - * implied or otherwise, applies only to this software file. Patent
> - * licenses, if any, provided herein do not apply to combinations of
> - * this program with other software, or any other product whatsoever.
> - *
> - * You should have received a copy of the GNU General Public License
> - * along with this program; if not, write the Free Software
> - * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
> - * 02110-1301, USA.
> - *
> - * This test is a reporducer for this patch:
> - * https://lkml.org/lkml/2012/4/24/328
> + * This test is a reporducer for this patch: https://lkml.org/lkml/2012/4/24/328
very nit: I would trust lore more, thus I would use
https://lore.kernel.org/lkml/1335289853-2923-1-git-send-email-siddhesh.poyarekar@gmail.com/
> * Since vma length in dup_mmap is calculated and stored in a unsigned
> * int, it will overflow when length of mmaped memory > 16 TB. When
> - * overflow occur, fork will incorrectly succeed. The patch above
> - * fixed it.
> - ********************************************************************/
> + * overflow occur, fork will incorrectly succeed. The patch above fixed it.
s/occur/occurs/
> + */
> -#include <sys/mman.h>
> -#include <sys/wait.h>
> -#include <stdio.h>
> -#include <unistd.h>
> -#include "test.h"
> -#include "safe_macros.h"
> -#include "lapi/abisize.h"
> +#include "tst_test.h"
> -char *TCID = "fork14";
> -int TST_TOTAL = 1;
> +#ifndef TST_ABI32
We can use .skip_in_compat = 1, flag instead.
> -#define GB (1024 * 1024 * 1024L)
> +#include <stdlib.h>
> +#include <sys/wait.h>
> -/* set mmap threshold to 16TB */
> #define LARGE (16 * 1024)
> #define EXTENT (16 * 1024 + 10)
> -static char **pointer_vec;
> +static char **memvec;
> -static void setup(void);
> -static void cleanup(void);
> -static int fork_test(void);
> -
> -int main(int ac, char **av)
> +static void run(void)
> {
> - int lc, reproduced;
> + int i, j, ret;
> + pid_t pid;
> + void *mem;
> + int prev_failed = 0;
> + int passed = 1;
> + int failures = 0;
> + for (i = 0; i < EXTENT; i++) {
I wonder if the code would not be slightly more readable if the content of the
loop was in the separate function. Probably not, feel free to ignore.
> + mem = mmap(NULL, 1 * TST_GB,
> + PROT_READ | PROT_WRITE,
> + MAP_PRIVATE | MAP_ANONYMOUS,
> + 0, 0);
...
> + if (mem == MAP_FAILED) {
> + failures++;
...
> + if (failures > 10) {
> + tst_brk(TCONF, "mmap() fails too many "
> + "times, so it's almost impossible to "
> + "get a vm_area_struct sized 16TB.");
> + }
> -static void cleanup(void)
> -{
> - free(pointer_vec);
> -}
> + continue;
> + }
> - switch (tst_fork()) {
> - case -1:
> - prev_failed = 1;
> - break;
> - case 0:
> + if (!pid)
> exit(0);
> - default:
> - SAFE_WAITPID(cleanup, -1, NULL, 0);
> - if (prev_failed > 0 && i >= LARGE) {
> - tst_resm(TFAIL, "Fork succeeds incorrectly");
> - reproduced = 1;
> - goto clear_memory_map;
> - }
> + ret = waitpid(pid, NULL, 0);
Why not SAFE_WAITPID() as it was originally?
> + if (ret == -1 && errno != ECHILD)
> + tst_brk(TBROK | TERRNO, "waitpid() error");
> +
> + if (prev_failed && i >= LARGE) {
> + passed = 0;
> + break;
> }
> +
> + prev_failed = 0;
> +
> + tst_res(TINFO, "fork() passed at %d attempt", i);
> + }
> +
> + for (j = 0; j < i; j++) {
> + if (memvec[j])
> + SAFE_MUNMAP(memvec[j], 1 * TST_GB);
> }
> -clear_memory_map:
> - for (j = 0; j < cnt; j++) {
> - if (pointer_vec[j])
> - SAFE_MUNMAP(cleanup, pointer_vec[j], 1 * GB);
> + if (passed)
> + tst_res(TPASS, "fork() failed as expected");
> + else
> + tst_res(TFAIL, "fork() succeeded incorrectly");
> +}
> +
> +static void setup(void)
> +{
> + memvec = SAFE_MALLOC(EXTENT * sizeof(char *));
> + memset(memvec, 0, EXTENT);
> +}
> +
> +static void cleanup(void)
> +{
> + for (long i = 0; i < EXTENT; i++) {
> + if (memvec && memvec[i])
> + SAFE_MUNMAP(memvec[i], 1 * TST_GB);
> }
> - return reproduced;
> + if (memvec)
> + free(memvec);
> }
> +
> +static struct tst_test test = {
> + .test_all = run,
> + .setup = setup,
> + .cleanup = cleanup,
> + .forks_child = 1,
> + .tags = (const struct tst_tag[]) {
> + {"linux-git", "7edc8b0ac16cbaed7cb4ea4c6b95ce98d2997e84"},
nit: we usually use shorter hash 7edc8b0ac16c (as used in Fixes: in git
commits).
> + {}
> + }
> +};
> +
> +#else /* TST_ABI32 */
> + TST_TEST_TCONF("Test doesn't supports 32bits architecture");
s/supports/support/
But we can use .skip_in_compat = 1, flag instead.
Kind regards,
Petr
> +#endif