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stress-handle.c
285 lines (247 loc) · 7.19 KB
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stress-handle.c
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/*
* Copyright (C) 2013-2021 Canonical, Ltd.
* Copyright (C) 2022-2024 Colin Ian King.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include "stress-ng.h"
#include "core-builtin.h"
#include "core-out-of-memory.h"
static const stress_help_t help[] = {
{ NULL, "handle N", "start N workers exercising name_to_handle_at" },
{ NULL, "handle-ops N", "stop after N handle bogo operations" },
{ NULL, NULL, NULL }
};
#if defined(HAVE_NAME_TO_HANDLE_AT) && \
defined(HAVE_OPEN_BY_HANDLE_AT) && \
defined(AT_FDCWD)
#define MAX_MOUNT_IDS (1024)
#define FILENAME "/dev/zero"
/* Stringification macros */
#define XSTR(s) STR(s)
#define STR(s) #s
typedef struct {
char *mount_path; /* mount full path, e.g. /boot */
int mount_id; /* unique mount id */
} stress_mount_info_t;
static stress_mount_info_t mount_info[MAX_MOUNT_IDS];
/*
* free_mount_info()
* free allocated mount information
*/
static void free_mount_info(const int mounts)
{
int i;
for (i = 0; i < mounts; i++)
free(mount_info[i].mount_path);
}
/*
* get_mount_info()
* parse mount information from /proc/self/mountinfo
*/
static int get_mount_info(stress_args_t *args)
{
FILE *fp;
int mounts = 0;
if ((fp = fopen("/proc/self/mountinfo", "r")) == NULL) {
pr_dbg("%s: cannot open /proc/self/mountinfo\n", args->name);
return -1;
}
(void)shim_memset(&mount_info, 0, sizeof(mount_info));
while (mounts < MAX_MOUNT_IDS) {
char mount_path[PATH_MAX + 1];
char *line = NULL;
size_t line_len = 0;
ssize_t nread;
nread = getline(&line, &line_len, fp);
if (nread == -1) {
free(line);
break;
}
nread = sscanf(line, "%12d %*d %*s %*s %" XSTR(PATH_MAX) "s",
&mount_info[mounts].mount_id,
mount_path);
free(line);
if (nread != 2)
continue;
mount_info[mounts].mount_path = strdup(mount_path);
if (mount_info[mounts].mount_path == NULL) {
pr_dbg("%s: cannot allocate mountinfo mount path\n", args->name);
free_mount_info(mounts);
mounts = -1;
break;
}
mounts++;
}
(void)fclose(fp);
return mounts;
}
/*
* stress_handle_child()
* exercise name_to_handle_at inside an oomble child
* wrapper because the allocations may cause memory
* failures on high memory pressure environments.
*/
static int stress_handle_child(stress_args_t *args, void *context)
{
const int mounts = *((int *)context);
const int bad_fd = stress_get_bad_fd();
int rc = EXIT_SUCCESS;
do {
struct file_handle *fhp, *tmp;
int mount_id, mount_fd, fd, i;
char *ptr;
fhp = malloc(sizeof(*fhp));
if (!fhp)
continue;
fhp->handle_bytes = 0;
if ((name_to_handle_at(AT_FDCWD, FILENAME, fhp, &mount_id, 0) != -1) &&
(errno != EOVERFLOW)) {
pr_fail("%s: name_to_handle_at failed to get file handle size, errno=%d (%s)\n",
args->name, errno, strerror(errno));
rc = EXIT_FAILURE;
free(fhp);
break;
}
tmp = realloc(fhp, sizeof(*tmp) + fhp->handle_bytes);
if (tmp == NULL) {
free(fhp);
continue;
}
fhp = tmp;
if (name_to_handle_at(AT_FDCWD, FILENAME, fhp, &mount_id, 0) < 0) {
pr_fail("%s: name_to_handle_at failed to get file handle, errno=%d (%s)\n",
args->name, errno, strerror(errno));
rc = EXIT_FAILURE;
free(fhp);
break;
}
mount_fd = -2;
for (i = 0; i < mounts; i++) {
if (mount_info[i].mount_id == mount_id) {
mount_fd = open(mount_info[i].mount_path, O_RDONLY);
break;
}
}
if (mount_fd == -2) {
pr_fail("%s: cannot find mount id %d\n", args->name, mount_id);
rc = EXIT_FAILURE;
free(fhp);
break;
}
if (mount_fd < 0) {
pr_fail("%s: failed to open mount path '%s': errno=%d (%s)\n",
args->name, mount_info[i].mount_path, errno, strerror(errno));
rc = EXIT_FAILURE;
free(fhp);
break;
}
fd = open_by_handle_at(mount_fd, fhp, O_RDONLY);
if (fd < 0) {
/* We don't abort if EPERM occurs, that's not a test failure */
if (errno != EPERM) {
pr_fail("%s: open_by_handle_at: failed to open: errno=%d (%s)\n",
args->name, errno, strerror(errno));
(void)close(mount_fd);
rc = EXIT_FAILURE;
free(fhp);
break;
}
} else {
(void)close(fd);
}
/* Exercise with large invalid size, EINVAL */
fhp->handle_bytes = 4096;
tmp = realloc(fhp, sizeof(*tmp) + fhp->handle_bytes);
if (!tmp) {
(void)close(mount_fd);
free(fhp);
continue;
}
fhp = tmp;
(void)name_to_handle_at(AT_FDCWD, FILENAME, fhp, &mount_id, 0);
/* Exercise with invalid flags, EINVAL */
fhp->handle_bytes = 0;
(void)name_to_handle_at(AT_FDCWD, FILENAME, fhp, &mount_id, ~0);
/* Exercise with invalid filename, ENOENT */
fhp->handle_bytes = 0;
(void)name_to_handle_at(AT_FDCWD, "", fhp, &mount_id, 0);
/* Exercise with invalid handle_bytes, EOVERFLOW */
fhp->handle_bytes = 1;
(void)name_to_handle_at(AT_FDCWD, FILENAME, fhp, &mount_id, AT_EMPTY_PATH);
/* Exercise with invalid mount_fd, part 1*/
fhp->handle_bytes = 32;
(void)name_to_handle_at(AT_FDCWD, FILENAME, fhp, &mount_id, 0);
fd = open_by_handle_at(-1, fhp, O_RDONLY);
if (fd >= 0)
(void)close(fd);
/* Exercise with invalid mount_fd, part 2 */
fhp->handle_bytes = 32;
(void)name_to_handle_at(AT_FDCWD, FILENAME, fhp, &mount_id, 0);
fd = open_by_handle_at(bad_fd, fhp, O_RDONLY);
if (fd >= 0)
(void)close(fd);
/*
* Exercise with bad handle, unconstify f_handle,
* fill it with random garbage and cause an ESTALE
* failure
*/
ptr = (char *)shim_unconstify_ptr(&fhp->f_handle);
stress_rndbuf(ptr, 32);
fd = open_by_handle_at(mount_fd, fhp, O_RDONLY);
if (fd >= 0)
(void)close(fd);
(void)close(mount_fd);
free(fhp);
stress_bogo_inc(args);
} while (stress_continue(args));
return rc;
}
/*
* stress_handle()
* stress system by rapid open/close calls via
* name_to_handle_at and open_by_handle_at
*/
static int stress_handle(stress_args_t *args)
{
int mounts, ret;
mounts = get_mount_info(args);
if (mounts < 0) {
pr_fail("%s: failed to parse /proc/self/mountinfo\n", args->name);
return EXIT_FAILURE;
}
stress_set_proc_state(args->name, STRESS_STATE_RUN);
ret = stress_oomable_child(args, &mounts,
stress_handle_child, STRESS_OOMABLE_NORMAL);
stress_set_proc_state(args->name, STRESS_STATE_DEINIT);
free_mount_info(mounts);
return ret;
}
stressor_info_t stress_handle_info = {
.stressor = stress_handle,
.class = CLASS_FILESYSTEM | CLASS_OS,
.verify = VERIFY_ALWAYS,
.help = help
};
#else
stressor_info_t stress_handle_info = {
.stressor = stress_unimplemented,
.class = CLASS_FILESYSTEM | CLASS_OS,
.verify = VERIFY_ALWAYS,
.help = help,
.unimplemented_reason = "built without name_to_handle_at(), open_by_handle_at() or AT_FDCWD"
};
#endif