diff options
Diffstat (limited to 'meta-networking/recipes-daemons/autofs/autofs-5.0.7/autofs-5.0.7-fix-file-descriptor-leak-when-reloading-the-daemon.patch')
| -rw-r--r-- | meta-networking/recipes-daemons/autofs/autofs-5.0.7/autofs-5.0.7-fix-file-descriptor-leak-when-reloading-the-daemon.patch | 179 |
1 files changed, 179 insertions, 0 deletions
diff --git a/meta-networking/recipes-daemons/autofs/autofs-5.0.7/autofs-5.0.7-fix-file-descriptor-leak-when-reloading-the-daemon.patch b/meta-networking/recipes-daemons/autofs/autofs-5.0.7/autofs-5.0.7-fix-file-descriptor-leak-when-reloading-the-daemon.patch new file mode 100644 index 0000000000..8ce6c0f9e3 --- /dev/null +++ b/meta-networking/recipes-daemons/autofs/autofs-5.0.7/autofs-5.0.7-fix-file-descriptor-leak-when-reloading-the-daemon.patch @@ -0,0 +1,179 @@ +autofs-5.0.7 - fix file descriptor leak when reloading the daemon + +From: Leonardo Chiquitto <leonardo.lists@gmail.com> + +A customer reported that AutoFS may leak file descriptors when some +maps are modified and the daemon reloaded. I'm able to reproduce the +problem on 5.0.7 by following these steps: + +1. Configure a simple direct mount: + +# cat /etc/auto.master +/- /etc/auto.direct + +# cat /etc/auto.direct +/nfs server:/nfs + +2. Start the automounter and do NOT trigger the mount + +3. Replace /etc/auto.direct with: + +# cat /etc/auto.direct +/nfs/1 server:/nfs +/nfs/2 server:/nfs + +4. Reload: + +# kill -HUP $(pidof automount) + +>From now on, every reload will leak a file descriptor: + +# ls -la /proc/$(pidof automount)/fd | grep /nfs +lr-x------ 1 root root 64 Aug 14 22:08 11 -> /nfs +lr-x------ 1 root root 64 Aug 14 22:08 12 -> /nfs +lr-x------ 1 root root 64 Aug 14 22:08 13 -> /nfs +lr-x------ 1 root root 64 Aug 14 22:08 14 -> /nfs +lr-x------ 1 root root 64 Aug 14 22:08 5 -> /nfs + +I've investigated the problem and discovered that the leak happens in +do_umount_autofs_direct(): + +- edit imk +The same leak is present in umount_autofs_offset() also. +Updated patch to cover that too. +- end edit + +int do_umount_autofs_direct(struct autofs_point *ap, struct mnt_list +*mnts, struct mapent *me) +{ +(...) + if (me->ioctlfd != -1) { + if (tree_is_mounted(mnts, me->key, MNTS_REAL)) { + error(ap->logopt, + "attempt to umount busy direct mount %s", + me->key); + return 1; + } + ioctlfd = me->ioctlfd; + } else // ioctlfd == -1 + ops->open(ap->logopt, &ioctlfd, me->dev, me->key); <= we open it here + + if (ioctlfd >= 0) { + unsigned int status = 1; + + rv = ops->askumount(ap->logopt, ioctlfd, &status); + /// at this point, rv == 0 and status == 0 + if (rv) { + char *estr = strerror_r(errno, buf, MAX_ERR_BUF); + error(ap->logopt, "ioctl failed: %s", estr); + return 1; + } else if (!status) { + /// at this point, ap->state == ST_READMAP + if (ap->state != ST_SHUTDOWN_FORCE) { + error(ap->logopt, + "ask umount returned busy for %s", + me->key); + return 1; <= we return here, without closing the fd + } else { + me->ioctlfd = -1; + ops->catatonic(ap->logopt, ioctlfd); + ops->close(ap->logopt, ioctlfd); + goto force_umount; + } +(...) +--- + CHANGELOG | 1 + + daemon/direct.c | 19 ++++++++++++++++--- + 2 files changed, 17 insertions(+), 3 deletions(-) + +diff --git a/CHANGELOG b/CHANGELOG +index 46ef335..a7ed212 100644 +--- a/CHANGELOG ++++ b/CHANGELOG +@@ -30,6 +30,7 @@ + - workaround missing GNU versionsort extension. + - dont fail on master map self include. + - fix wildcard multi map regression. ++- fix file descriptor leak when reloading the daemon. + + 25/07/2012 autofs-5.0.7 + ======================= +diff --git a/daemon/direct.c b/daemon/direct.c +index 3e09c5d..228a666 100644 +--- a/daemon/direct.c ++++ b/daemon/direct.c +@@ -86,7 +86,8 @@ int do_umount_autofs_direct(struct autofs_point *ap, struct mnt_list *mnts, stru + { + struct ioctl_ops *ops = get_ioctl_ops(); + char buf[MAX_ERR_BUF]; +- int ioctlfd, rv, left, retries; ++ int ioctlfd = -1, rv, left, retries; ++ int opened = 0; + + left = umount_multi(ap, me->key, 0); + if (left) { +@@ -103,8 +104,10 @@ int do_umount_autofs_direct(struct autofs_point *ap, struct mnt_list *mnts, stru + return 1; + } + ioctlfd = me->ioctlfd; +- } else ++ } else { + ops->open(ap->logopt, &ioctlfd, me->dev, me->key); ++ opened = 1; ++ } + + if (ioctlfd >= 0) { + unsigned int status = 1; +@@ -113,12 +116,16 @@ int do_umount_autofs_direct(struct autofs_point *ap, struct mnt_list *mnts, stru + if (rv) { + char *estr = strerror_r(errno, buf, MAX_ERR_BUF); + error(ap->logopt, "ioctl failed: %s", estr); ++ if (opened && ioctlfd != -1) ++ ops->close(ap->logopt, ioctlfd); + return 1; + } else if (!status) { + if (ap->state != ST_SHUTDOWN_FORCE) { + error(ap->logopt, + "ask umount returned busy for %s", + me->key); ++ if (opened && ioctlfd != -1) ++ ops->close(ap->logopt, ioctlfd); + return 1; + } else { + me->ioctlfd = -1; +@@ -536,7 +543,8 @@ int umount_autofs_offset(struct autofs_point *ap, struct mapent *me) + { + struct ioctl_ops *ops = get_ioctl_ops(); + char buf[MAX_ERR_BUF]; +- int ioctlfd, rv = 1, retries; ++ int ioctlfd = -1, rv = 1, retries; ++ int opened = 0; + + if (me->ioctlfd != -1) { + if (is_mounted(_PATH_MOUNTED, me->key, MNTS_REAL)) { +@@ -554,6 +562,7 @@ int umount_autofs_offset(struct autofs_point *ap, struct mapent *me) + return 0; + } + ops->open(ap->logopt, &ioctlfd, me->dev, me->key); ++ opened = 1; + } + + if (ioctlfd >= 0) { +@@ -563,6 +572,8 @@ int umount_autofs_offset(struct autofs_point *ap, struct mapent *me) + if (rv) { + char *estr = strerror_r(errno, buf, MAX_ERR_BUF); + logerr("ioctl failed: %s", estr); ++ if (opened && ioctlfd != -1) ++ ops->close(ap->logopt, ioctlfd); + return 1; + } else if (!status) { + if (ap->state != ST_SHUTDOWN_FORCE) { +@@ -570,6 +581,8 @@ int umount_autofs_offset(struct autofs_point *ap, struct mapent *me) + error(ap->logopt, + "ask umount returned busy for %s", + me->key); ++ if (opened && ioctlfd != -1) ++ ops->close(ap->logopt, ioctlfd); + return 1; + } else { + me->ioctlfd = -1; |