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lib/: set O_CLOEXEC on all fds

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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
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lib/libzfs/libzfs_diff.c
+2 -2
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@@ -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));