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lib/: set O_CLOEXEC on all fds

Browse Source 
As found by
  git grep -E '(open|setmntent|pipe2?)\(' |
    grep -vE '((zfs|zpool)_|fd|dl|lzc_re|pidfile_|g_)open\('

FreeBSD's pidfile_open() says nothing about the flags of the files it
opens, but we can't do anything about it anyway; the implementation does
open all files with O_CLOEXEC

Consider this output with zpool.d/media appended with
"pid=$$; (ls -l /proc/$pid/fd > /dev/tty)":
  $ /sbin/zpool iostat -vc media
  lrwx------ 0 -> /dev/pts/0
  l-wx------ 1 -> 'pipe:[3278500]'
  l-wx------ 2 -> /dev/null
  lrwx------ 3 -> /dev/zfs
  lr-x------ 4 -> /proc/31895/mounts
  lrwx------ 5 -> /dev/zfs
  lr-x------ 10 -> /usr/lib/zfs-linux/zpool.d/media
vs
  $ ./zpool iostat -vc vendor,upath,iostat,media
  lrwx------ 0 -> /dev/pts/0
  l-wx------ 1 -> 'pipe:[3279887]'
  l-wx------ 2 -> /dev/null
  lr-x------ 10 -> /usr/lib/zfs-linux/zpool.d/media

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Closes #11866
This commit is contained in:
наб 2021-04-08 22:17:38 +02:00 committed by Brian Behlendorf
parent 92ffd87aaf
commit 10b575d04c
22 changed files with 51 additions and 62 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
include/sys/zfs_context.h
View File

@ -638,8 +638,8 @@ extern void delay(clock_t ticks);
#define NN_NUMBUF_SZ (6)
extern uint64_t physmem;
extern char *random_path;
extern char *urandom_path;
extern const char *random_path;
extern const char *urandom_path;
extern int highbit64(uint64_t i);
extern int lowbit64(uint64_t i);

10
lib/libshare/os/freebsd/nfs.c
View File

@ -66,7 +66,7 @@ static int
nfs_exports_lock(void)
{
nfs_lock_fd = open(ZFS_EXPORTS_LOCK,
O_RDWR | O_CREAT, 0600);
O_RDWR | O_CREAT | O_CLOEXEC, 0600);
if (nfs_lock_fd == -1) {
fprintf(stderr, "failed to lock %s: %s\n",
ZFS_EXPORTS_LOCK, strerror(errno));
@ -228,8 +228,8 @@ nfs_copy_entries(char *filename, const char *mountpoint)
int error = SA_OK;
char *line;
FILE *oldfp = fopen(ZFS_EXPORTS_FILE, "r");
FILE *newfp = fopen(filename, "w+");
FILE *oldfp = fopen(ZFS_EXPORTS_FILE, "re");
FILE *newfp = fopen(filename, "w+e");
if (newfp == NULL) {
fprintf(stderr, "failed to open %s file: %s", filename,
strerror(errno));
@ -291,7 +291,7 @@ nfs_enable_share(sa_share_impl_t impl_share)
return (error);
}
FILE *fp = fopen(filename, "a+");
FILE *fp = fopen(filename, "a+e");
if (fp == NULL) {
fprintf(stderr, "failed to open %s file: %s", filename,
strerror(errno));
@ -368,7 +368,7 @@ nfs_is_shared(sa_share_impl_t impl_share)
char *mntpoint = impl_share->sa_mountpoint;
size_t mntlen = strlen(mntpoint);
FILE *fp = fopen(ZFS_EXPORTS_FILE, "r");
FILE *fp = fopen(ZFS_EXPORTS_FILE, "re");
if (fp == NULL)
return (B_FALSE);

10
lib/libshare/os/linux/nfs.c
View File

@ -66,7 +66,7 @@ static int
nfs_exports_lock(void)
{
nfs_lock_fd = open(ZFS_EXPORTS_LOCK,
O_RDWR | O_CREAT, 0600);
O_RDWR | O_CREAT | O_CLOEXEC, 0600);
if (nfs_lock_fd == -1) {
fprintf(stderr, "failed to lock %s: %s\n",
ZFS_EXPORTS_LOCK, strerror(errno));
@ -453,7 +453,7 @@ nfs_add_entry(const char *filename, const char *sharepath,
if (linux_opts == NULL)
linux_opts = "";
FILE *fp = fopen(filename, "a+");
FILE *fp = fopen(filename, "a+e");
if (fp == NULL) {
fprintf(stderr, "failed to open %s file: %s", filename,
strerror(errno));
@ -489,8 +489,8 @@ nfs_copy_entries(char *filename, const char *mountpoint)
size_t buflen = 0;
int error = SA_OK;
FILE *oldfp = fopen(ZFS_EXPORTS_FILE, "r");
FILE *newfp = fopen(filename, "w+");
FILE *oldfp = fopen(ZFS_EXPORTS_FILE, "re");
FILE *newfp = fopen(filename, "w+e");
if (newfp == NULL) {
fprintf(stderr, "failed to open %s file: %s", filename,
strerror(errno));
@ -632,7 +632,7 @@ nfs_is_shared(sa_share_impl_t impl_share)
size_t buflen = 0;
char *buf = NULL;
FILE *fp = fopen(ZFS_EXPORTS_FILE, "r");
FILE *fp = fopen(ZFS_EXPORTS_FILE, "re");
if (fp == NULL) {
return (B_FALSE);
}

2
lib/libshare/os/linux/smb.c
View File

@ -107,7 +107,7 @@ smb_retrieve_shares(void)
if (!S_ISREG(eStat.st_mode))
continue;
if ((share_file_fp = fopen(file_path, "r")) == NULL) {
if ((share_file_fp = fopen(file_path, "re")) == NULL) {
rc = SA_SYSTEM_ERR;
goto out;
}

4
lib/libspl/os/linux/gethostid.c
View File

@ -45,7 +45,7 @@ get_spl_hostid(void)
return (hostid & HOSTID_MASK);
}
f = fopen("/sys/module/spl/parameters/spl_hostid", "r");
f = fopen("/sys/module/spl/parameters/spl_hostid", "re");
if (!f)
return (0);
@ -74,7 +74,7 @@ get_system_hostid(void)
unsigned long hostid;
int hostid_size = 4; /* 4 bytes regardless of arch */
fd = open("/etc/hostid", O_RDONLY);
fd = open("/etc/hostid", O_RDONLY | O_CLOEXEC);
if (fd >= 0) {
rc = read(fd, &hostid, hostid_size);
if (rc > 0)

4
lib/libspl/os/linux/getmntany.c
View File

@ -128,9 +128,9 @@ getextmntent(const char *path, struct extmnttab *entry, struct stat64 *statbuf)
#ifdef HAVE_SETMNTENT
if ((fp = setmntent(MNTTAB, "r")) == NULL) {
if ((fp = setmntent(MNTTAB, "re")) == NULL) {
#else
if ((fp = fopen(MNTTAB, "r")) == NULL) {
if ((fp = fopen(MNTTAB, "re")) == NULL) {
#endif
(void) fprintf(stderr, "cannot open %s\n", MNTTAB);
return (-1);

8
lib/libuutil/uu_open.c
View File

@ -36,12 +36,6 @@
#include <stdio.h>
#include <unistd.h>
#ifdef _LP64
#define TMPPATHFMT "%s/uu%ld"
#else /* _LP64 */
#define TMPPATHFMT "%s/uu%lld"
#endif /* _LP64 */
/*ARGSUSED*/
int
uu_open_tmp(const char *dir, uint_t uflags)
@ -55,7 +49,7 @@ uu_open_tmp(const char *dir, uint_t uflags)
for (;;) {
(void) snprintf(fname, PATH_MAX, "%s/uu%lld", dir, gethrtime());
f = open(fname, O_CREAT | O_EXCL | O_RDWR, 0600);
f = open(fname, O_CREAT | O_EXCL | O_RDWR | O_CLOEXEC, 0600);
if (f >= 0 || errno != EEXIST)
break;

4
lib/libzfs/libzfs_crypto.c
View File

@ -71,7 +71,7 @@ pkcs11_get_urandom(uint8_t *buf, size_t bytes)
int rand;
ssize_t bytes_read = 0;
rand = open("/dev/urandom", O_RDONLY);
rand = open("/dev/urandom", O_RDONLY | O_CLOEXEC);
if (rand < 0)
return (rand);
@ -468,7 +468,7 @@ get_key_material_file(libzfs_handle_t *hdl, const char *uri,
if (strlen(uri) < 7)
return (EINVAL);
if ((f = fopen(uri + 7, "r")) == NULL) {
if ((f = fopen(uri + 7, "re")) == NULL) {
ret = errno;
errno = 0;
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,

4
lib/libzfs/libzfs_diff.c
View File

@ -697,7 +697,7 @@ setup_differ_info(zfs_handle_t *zhp, const char *fromsnap,
{
di->zhp = zhp;
di->cleanupfd = open(ZFS_DEV, O_RDWR);
di->cleanupfd = open(ZFS_DEV, O_RDWR | O_CLOEXEC);
VERIFY(di->cleanupfd >= 0);
if (get_snapshot_names(di, fromsnap, tosnap) != 0)
@ -731,7 +731,7 @@ zfs_show_diffs(zfs_handle_t *zhp, int outfd, const char *fromsnap,
return (-1);
}
if (pipe(pipefd)) {
if (pipe2(pipefd, O_CLOEXEC)) {
zfs_error_aux(zhp->zfs_hdl, strerror(errno));
teardown_differ_info(&di);
return (zfs_error(zhp->zfs_hdl, EZFS_PIPEFAILED, errbuf));

2
lib/libzfs/libzfs_iter.c
View File

@ -565,7 +565,7 @@ zfs_iter_mounted(zfs_handle_t *zhp, zfs_iter_f func, void *data)
FILE *mnttab;
int err = 0;
if ((mnttab = fopen(MNTTAB, "r")) == NULL)
if ((mnttab = fopen(MNTTAB, "re")) == NULL)
return (ENOENT);
while (err == 0 && getmntent(mnttab, &entry) == 0) {

10
lib/libzfs/libzfs_pool.c
View File

@ -4809,13 +4809,11 @@ zpool_load_compat(const char *compatibility,
* as they're only needed if the filename is relative
* which will be checked during the openat().
*/
#ifdef O_PATH
sdirfd = open(ZPOOL_SYSCONF_COMPAT_D, O_DIRECTORY | O_PATH);
ddirfd = open(ZPOOL_DATA_COMPAT_D, O_DIRECTORY | O_PATH);
#else
sdirfd = open(ZPOOL_SYSCONF_COMPAT_D, O_DIRECTORY | O_RDONLY);
ddirfd = open(ZPOOL_DATA_COMPAT_D, O_DIRECTORY | O_RDONLY);
#ifndef O_PATH
#define O_PATH O_RDONLY
#endif
sdirfd = open(ZPOOL_SYSCONF_COMPAT_D, O_DIRECTORY | O_PATH | O_CLOEXEC);
ddirfd = open(ZPOOL_DATA_COMPAT_D, O_DIRECTORY | O_PATH | O_CLOEXEC);
(void) strlcpy(filenames, compatibility, ZFS_MAXPROPLEN);
file = strtok_r(filenames, ",", &ps);

2
lib/libzfs/libzfs_sendrecv.c
View File

@ -2217,7 +2217,7 @@ zfs_send(zfs_handle_t *zhp, const char *fromsnap, const char *tosnap,
++holdseq;
(void) snprintf(sdd.holdtag, sizeof (sdd.holdtag),
".send-%d-%llu", getpid(), (u_longlong_t)holdseq);
sdd.cleanup_fd = open(ZFS_DEV, O_RDWR);
sdd.cleanup_fd = open(ZFS_DEV, O_RDWR | O_CLOEXEC);
if (sdd.cleanup_fd < 0) {
err = errno;
goto stderr_out;

10
lib/libzfs/libzfs_util.c
View File

@ -884,13 +884,13 @@ libzfs_run_process_impl(const char *path, char *argv[], char *env[], int flags,
* Setup a pipe between our child and parent process if we're
* reading stdout.
*/
if ((lines != NULL) && pipe(link) == -1)
if ((lines != NULL) && pipe2(link, O_CLOEXEC) == -1)
return (-EPIPE);
pid = vfork();
if (pid == 0) {
/* Child process */
devnull_fd = open("/dev/null", O_WRONLY);
devnull_fd = open("/dev/null", O_WRONLY | O_CLOEXEC);
if (devnull_fd < 0)
_exit(-1);
@ -900,15 +900,11 @@ libzfs_run_process_impl(const char *path, char *argv[], char *env[], int flags,
else if (lines != NULL) {
/* Save the output to lines[] */
dup2(link[1], STDOUT_FILENO);
close(link[0]);
close(link[1]);
}
if (!(flags & STDERR_VERBOSE))
(void) dup2(devnull_fd, STDERR_FILENO);
close(devnull_fd);
if (flags & NO_DEFAULT_PATH) {
if (env == NULL)
execv(path, argv);
@ -1144,7 +1140,7 @@ zfs_path_to_zhandle(libzfs_handle_t *hdl, const char *path, zfs_type_t argtype)
}
/* Reopen MNTTAB to prevent reading stale data from open file */
if (freopen(MNTTAB, "r", hdl->libzfs_mnttab) == NULL)
if (freopen(MNTTAB, "re", hdl->libzfs_mnttab) == NULL)
return (NULL);
if (getextmntent(path, &entry, &statbuf) != 0)

10
lib/libzfs/os/linux/libzfs_pool_os.c
View File

@ -62,7 +62,7 @@ zpool_relabel_disk(libzfs_handle_t *hdl, const char *path, const char *msg)
{
int fd, error;
if ((fd = open(path, O_RDWR|O_DIRECT)) < 0) {
if ((fd = open(path, O_RDWR|O_DIRECT|O_CLOEXEC)) < 0) {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "cannot "
"relabel '%s': unable to open device: %d"), path, errno);
return (zfs_error(hdl, EZFS_OPENFAILED, msg));
@ -107,7 +107,7 @@ read_efi_label(nvlist_t *config, diskaddr_t *sb)
(void) snprintf(diskname, sizeof (diskname), "%s%s", DISK_ROOT,
strrchr(path, '/'));
if ((fd = open(diskname, O_RDONLY|O_DIRECT)) >= 0) {
if ((fd = open(diskname, O_RDONLY|O_DIRECT|O_CLOEXEC)) >= 0) {
struct dk_gpt *vtoc;
if ((err = efi_alloc_and_read(fd, &vtoc)) >= 0) {
@ -159,7 +159,7 @@ zpool_label_disk_check(char *path)
struct dk_gpt *vtoc;
int fd, err;
if ((fd = open(path, O_RDONLY|O_DIRECT)) < 0)
if ((fd = open(path, O_RDONLY|O_DIRECT|O_CLOEXEC)) < 0)
return (errno);
if ((err = efi_alloc_and_read(fd, &vtoc)) != 0) {
@ -190,7 +190,7 @@ zpool_label_name(char *label_name, int label_size)
uint64_t id = 0;
int fd;
fd = open("/dev/urandom", O_RDONLY);
fd = open("/dev/urandom", O_RDONLY|O_CLOEXEC);
if (fd >= 0) {
if (read(fd, &id, sizeof (id)) != sizeof (id))
id = 0;
@ -241,7 +241,7 @@ zpool_label_disk(libzfs_handle_t *hdl, zpool_handle_t *zhp, const char *name)
(void) snprintf(path, sizeof (path), "%s/%s", DISK_ROOT, name);
if ((fd = open(path, O_RDWR|O_DIRECT|O_EXCL)) < 0) {
if ((fd = open(path, O_RDWR|O_DIRECT|O_EXCL|O_CLOEXEC)) < 0) {
/*
* This shouldn't happen. We've long since verified that this
* is a valid device.

2
lib/libzfs/os/linux/libzfs_sendrecv_os.c
View File

@ -35,7 +35,7 @@
void
libzfs_set_pipe_max(int infd)
{
FILE *procf = fopen("/proc/sys/fs/pipe-max-size", "r");
FILE *procf = fopen("/proc/sys/fs/pipe-max-size", "re");
if (procf != NULL) {
unsigned long max_psize;

4
lib/libzfs/os/linux/libzfs_util_os.c
View File

@ -143,7 +143,7 @@ libzfs_load_module_impl(const char *module)
start = gethrtime();
do {
fd = open(ZFS_DEV, O_RDWR);
fd = open(ZFS_DEV, O_RDWR | O_CLOEXEC);
if (fd >= 0) {
(void) close(fd);
return (0);
@ -195,7 +195,7 @@ zfs_version_kernel(char *version, int len)
int fd;
int rlen;
if ((fd = open(ZFS_SYSFS_DIR "/version", O_RDONLY)) == -1)
if ((fd = open(ZFS_SYSFS_DIR "/version", O_RDONLY | O_CLOEXEC)) == -1)
return (-1);
if ((rlen = read(fd, version, len)) == -1) {

8
lib/libzpool/kernel.c
View File

@ -723,15 +723,15 @@ lowbit64(uint64_t i)
return (__builtin_ffsll(i));
}
char *random_path = "/dev/random";
char *urandom_path = "/dev/urandom";
const char *random_path = "/dev/random";
const char *urandom_path = "/dev/urandom";
static int random_fd = -1, urandom_fd = -1;
void
random_init(void)
{
VERIFY((random_fd = open(random_path, O_RDONLY)) != -1);
VERIFY((urandom_fd = open(urandom_path, O_RDONLY)) != -1);
VERIFY((random_fd = open(random_path, O_RDONLY | O_CLOEXEC)) != -1);
VERIFY((urandom_fd = open(urandom_path, O_RDONLY | O_CLOEXEC)) != -1);
}
void

2
lib/libzpool/util.c
View File

@ -259,7 +259,7 @@ pool_active(void *unused, const char *name, uint64_t guid,
* Use ZFS_IOC_POOL_SYNC to confirm if a pool is active
*/
fd = open(ZFS_DEV, O_RDWR);
fd = open(ZFS_DEV, O_RDWR | O_CLOEXEC);
if (fd < 0)
return (-1);

2
lib/libzutil/os/freebsd/zutil_import_os.c
View File

@ -127,7 +127,7 @@ zpool_open_func(void *arg)
/*
* O_NONBLOCK so we don't hang trying to open things like serial ports.
*/
if ((fd = open(rn->rn_name, O_RDONLY|O_NONBLOCK)) < 0)
if ((fd = open(rn->rn_name, O_RDONLY|O_NONBLOCK|O_CLOEXEC)) < 0)
return;
/*

2
lib/libzutil/os/linux/zutil_device_path_os.c
View File

@ -390,7 +390,7 @@ zfs_dev_is_whole_disk(const char *dev_name)
struct dk_gpt *label;
int fd;
if ((fd = open(dev_name, O_RDONLY | O_DIRECT)) < 0)
if ((fd = open(dev_name, O_RDONLY | O_DIRECT | O_CLOEXEC)) < 0)
return (B_FALSE);
if (efi_alloc_and_init(fd, EFI_NUMPAR, &label) != 0) {

4
lib/libzutil/os/linux/zutil_import_os.c
View File

@ -136,9 +136,9 @@ zpool_open_func(void *arg)
* cache which may be stale for multipath devices. An EINVAL errno
* indicates O_DIRECT is unsupported so fallback to just O_RDONLY.
*/
fd = open(rn->rn_name, O_RDONLY | O_DIRECT);
fd = open(rn->rn_name, O_RDONLY | O_DIRECT | O_CLOEXEC);
if ((fd < 0) && (errno == EINVAL))
fd = open(rn->rn_name, O_RDONLY);
fd = open(rn->rn_name, O_RDONLY | O_CLOEXEC);
if ((fd < 0) && (errno == EACCES))
hdl->lpc_open_access_error = B_TRUE;
if (fd < 0)

5
lib/libzutil/zutil_import.c
View File

@ -1345,7 +1345,8 @@ zpool_find_import_impl(libpc_handle_t *hdl, importargs_t *iarg,
* would prevent a zdb -e of active pools with
* no cachefile.
*/
fd = open(slice->rn_name, O_RDONLY | O_EXCL);
fd = open(slice->rn_name,
O_RDONLY | O_EXCL | O_CLOEXEC);
if (fd >= 0 || iarg->can_be_active) {
if (fd >= 0)
close(fd);
@ -1437,7 +1438,7 @@ zpool_find_import_cached(libpc_handle_t *hdl, importargs_t *iarg)
verify(iarg->poolname == NULL || iarg->guid == 0);
if ((fd = open(iarg->cachefile, O_RDONLY)) < 0) {
if ((fd = open(iarg->cachefile, O_RDONLY | O_CLOEXEC)) < 0) {
zutil_error_aux(hdl, "%s", strerror(errno));
(void) zutil_error(hdl, EZFS_BADCACHE,
dgettext(TEXT_DOMAIN, "failed to open cache file"));