Max Kellermann e4b168c64d ceph: give up on paths longer than PATH_MAX ... commit 550f7ca98ee028a606aa75705a7e77b1bd11720f upstream. If the full path to be built by ceph_mdsc_build_path() happens to be longer than PATH_MAX, then this function will enter an endless (retry) loop, effectively blocking the whole task. Most of the machine becomes unusable, making this a very simple and effective DoS vulnerability. I cannot imagine why this retry was ever implemented, but it seems rather useless and harmful to me. Let's remove it and fail with ENAMETOOLONG instead. Cc: stable@vger.kernel.org Reported-by: Dario Weißer <dario@cure53.de> Signed-off-by: Max Kellermann <max.kellermann@ionos.com> Reviewed-by: Alex Markuze <amarkuze@redhat.com> Signed-off-by: Ilya Dryomov <idryomov@gmail.com> [idryomov@gmail.com: backport to 6.1: pr_warn() is still in use] Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2025-01-17 13:34:36 +01:00
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acl.c
addr.c
cache.c
cache.h
caps.c
ceph_frag.c
debugfs.c
dir.c
export.c
file.c
inode.c
io.c
io.h
ioctl.c
ioctl.h
Kconfig
locks.c
Makefile
mds_client.c	ceph: give up on paths longer than PATH_MAX	2025-01-17 13:34:36 +01:00
mds_client.h
mdsmap.c
metric.c
metric.h
quota.c
snap.c
strings.c
super.c
super.h
util.c
xattr.c