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libzfs{,_core}: set O_CLOEXEC on persistent (ZFS_DEV and MNTTAB) fds

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These were fd 3, 4, and 5 by the time zfs change-key hit
execute_key_fob()

glibc appends "e" to setmntent() mode, but musl's just returns fopen()

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Closes #11866
This commit is contained in:
наб
2021-03-10 00:00:43 +01:00
committed by Brian Behlendorf
parent 0fc401a7ef
commit 92ffd87aaf
4 changed files with 7 additions and 7 deletions
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lib/libzfs/libzfs_dataset.c
+2 -2
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@@ -811,7 +811,7 @@ libzfs_mnttab_update(libzfs_handle_t *hdl)
struct mnttab entry;
/* 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 (ENOENT);
while (getmntent(hdl->libzfs_mnttab, &entry) == 0) {
@@ -882,7 +882,7 @@ libzfs_mnttab_find(libzfs_handle_t *hdl, const char *fsname,
libzfs_mnttab_fini(hdl);
/* 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 (ENOENT);
srch.mnt_special = (char *)fsname;