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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:
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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_util.c
+3 -3
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@@ -1024,15 +1024,15 @@ libzfs_init(void)
return (NULL);
}
if ((hdl->libzfs_fd = open(ZFS_DEV, O_RDWR|O_EXCL)) < 0) {
if ((hdl->libzfs_fd = open(ZFS_DEV, O_RDWR|O_EXCL|O_CLOEXEC)) < 0) {
free(hdl);
return (NULL);
}
#ifdef HAVE_SETMNTENT
if ((hdl->libzfs_mnttab = setmntent(MNTTAB, "r")) == NULL) {
if ((hdl->libzfs_mnttab = setmntent(MNTTAB, "re")) == NULL) {
#else
if ((hdl->libzfs_mnttab = fopen(MNTTAB, "r")) == NULL) {
if ((hdl->libzfs_mnttab = fopen(MNTTAB, "re")) == NULL) {
#endif
(void) close(hdl->libzfs_fd);
free(hdl);