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583d0fef75
The following bit in ceph_msg_revoke_incoming() is unsafe:
struct ceph_connection *con = msg->con;
if (!con)
return;
mutex_lock(&con->mutex);
<more msg->con use>
There is nothing preventing con from getting destroyed right after
msg->con test. One easy way to reproduce this is to disable message
signing only on the server side and try to map an image. The system
will go into a
libceph: read_partial_message ffff880073f0ab68 signature check failed
libceph: osd0 192.168.255.155:6801 bad crc/signature
libceph: read_partial_message ffff880073f0ab68 signature check failed
libceph: osd0 192.168.255.155:6801 bad crc/signature
loop which has to be interrupted with Ctrl-C. Hit Ctrl-C and you are
likely to end up with a random GP fault if the reset handler executes
"within" ceph_msg_revoke_incoming():
<yet another reply w/o a signature>
...
<Ctrl-C>
rbd_obj_request_end
ceph_osdc_cancel_request
__unregister_request
ceph_osdc_put_request
ceph_msg_revoke_incoming
...
osd_reset
__kick_osd_requests
__reset_osd
remove_osd
ceph_con_close
reset_connection
<clear con->in_msg->con>
<put con ref>
put_osd
<free osd/con>
<msg->con use> <-- !!!
If ceph_msg_revoke_incoming() executes "before" the reset handler,
osd/con will be leaked because ceph_msg_revoke_incoming() clears
con->in_msg but doesn't put con ref, while reset_connection() only puts
con ref if con->in_msg != NULL.
The current msg->con scheme was introduced by commits
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| 802 | ||
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| appletalk | ||
| atm | ||
| ax25 | ||
| batman-adv | ||
| bluetooth | ||
| bridge | ||
| caif | ||
| can | ||
| ceph | ||
| core | ||
| dcb | ||
| dccp | ||
| decnet | ||
| dns_resolver | ||
| dsa | ||
| ethernet | ||
| hsr | ||
| ieee802154 | ||
| ipv4 | ||
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| iucv | ||
| key | ||
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| lapb | ||
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| mpls | ||
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| netrom | ||
| nfc | ||
| openvswitch | ||
| packet | ||
| phonet | ||
| rds | ||
| rfkill | ||
| rose | ||
| rxrpc | ||
| sched | ||
| sctp | ||
| sunrpc | ||
| switchdev | ||
| tipc | ||
| unix | ||
| vmw_vsock | ||
| wimax | ||
| wireless | ||
| x25 | ||
| xfrm | ||
| compat.c | ||
| Kconfig | ||
| Makefile | ||
| socket.c | ||
| sysctl_net.c | ||