autofs/autofs-5.1.7-eliminate-buffer-usage-from-handle_mounts_cleanup.patch

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2023-06-13 02:51:59 +00:00
autofs-5.1.7 - eliminate buffer usage from handle_mounts_cleanup()
From: Ian Kent <raven@themaw.net>
This buffer was originally added because a SEGV was seen accessing
the ap->path field on shutdown.
But this was actually caused by calling master_remove_mapent() too
early which adds the map entry to the master map join list that leads
to freeing the autofs_point (ap in the code) which also frees ap->path.
But the master map join list is protected by the master map mutex which
is held until after all the accesses are completed. So whatever the
problem was it doesn't appear to be present any more.
Nevertheless, to be sure, delay the call to master_remove_mapent() until
after all accesses to ap->path are completed.
Signed-off-by: Ian Kent <raven@themaw.net>
---
CHANGELOG | 1 +
daemon/automount.c | 13 ++++++-------
2 files changed, 7 insertions(+), 7 deletions(-)
--- autofs-5.1.4.orig/CHANGELOG
+++ autofs-5.1.4/CHANGELOG
@@ -140,6 +140,7 @@
- change to use printf functions in amd parser.
- dont call umount_subtree_mounts() on parent at umount.
- dont take parent source lock at mount shutdown.
+- eliminate buffer usage from handle_mounts_cleanup().
xx/xx/2018 autofs-5.1.5
- fix flag file permission.
--- autofs-5.1.4.orig/daemon/automount.c
+++ autofs-5.1.4/daemon/automount.c
@@ -1720,7 +1720,6 @@ void handle_mounts_startup_cond_destroy(
static void handle_mounts_cleanup(void *arg)
{
struct autofs_point *ap;
- char path[PATH_MAX + 1];
char buf[MAX_ERR_BUF];
unsigned int clean = 0, submount, logopt;
unsigned int pending = 0;
@@ -1730,7 +1729,6 @@ static void handle_mounts_cleanup(void *
logopt = ap->logopt;
submount = ap->submount;
- strcpy(path, ap->path);
if (!submount && strcmp(ap->path, "/-") &&
ap->flags & MOUNT_FLAG_DIR_CREATED)
clean = 1;
@@ -1752,8 +1750,8 @@ static void handle_mounts_cleanup(void *
/* Don't signal the handler if we have already done so */
if (!list_empty(&master_list->completed))
pending = 1;
- master_remove_mapent(ap->entry);
- master_source_unlock(ap->entry);
+
+ info(logopt, "shut down path %s", ap->path);
/*
* Submounts are detached threads and don't belong to the
@@ -1766,14 +1764,15 @@ static void handle_mounts_cleanup(void *
}
if (clean) {
- if (rmdir(path) == -1) {
+ if (rmdir(ap->path) == -1) {
char *estr = strerror_r(errno, buf, MAX_ERR_BUF);
warn(logopt, "failed to remove dir %s: %s",
- path, estr);
+ ap->path, estr);
}
}
- info(logopt, "shut down path %s", path);
+ master_remove_mapent(ap->entry);
+ master_source_unlock(ap->entry);
/*
* If we are not a submount send a signal to the signal handler