Added code to handle T3460 timer as part of stateless MME #5
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Signed-off-by: rashmi <[email protected]>
rsarwad
pushed a commit
that referenced
this pull request
Nov 30, 2020
* Add T3489 tests
Introduce a new test to validate T3489 expiry.
Credit to ulaskozat for the diff
Testing done:
Verified that an ASAN use after free occurs on timer expiry
=7031==ERROR: AddressSanitizer: heap-use-after-free on address 0x603000093460 at pc 0x555807545462 bp 0x7f87093fd2b0 sp 0x7f87093fd2a8
WRITE of size 8 at 0x603000093460 thread T16
#0 0x555807545461 in nas_stop_T3489 /home/vagrant/magma/lte/gateway/c/oai/tasks/nas/esm/esm_data_context.c:101
#1 0x5558075c47c5 in esm_proc_esm_information_response /home/vagrant/magma/lte/gateway/c/oai/tasks/nas/esm/esm_information.c:119
#2 0x55580759339b in esm_recv_information_response /home/vagrant/magma/lte/gateway/c/oai/tasks/nas/esm/sap/esm_recv.c:575
#3 0x555807551fba in _esm_sap_recv /home/vagrant/magma/lte/gateway/c/oai/tasks/nas/esm/sap/esm_sap.c:679
#4 0x555807550f33 in esm_sap_send /home/vagrant/magma/lte/gateway/c/oai/tasks/nas/esm/sap/esm_sap.c:283
#5 0x5558075195a0 in lowerlayer_data_ind /home/vagrant/magma/lte/gateway/c/oai/tasks/nas/emm/LowerLayer.c:276
#6 0x55580757848f in _emm_as_data_ind /home/vagrant/magma/lte/gateway/c/oai/tasks/nas/emm/sap/emm_as.c:688
#7 0x555807574ec4 in emm_as_send /home/vagrant/magma/lte/gateway/c/oai/tasks/nas/emm/sap/emm_as.c:180
#8 0x55580753147f in emm_sap_send /home/vagrant/magma/lte/gateway/c/oai/tasks/nas/emm/sap/emm_sap.c:105
#9 0x5558074d74fc in nas_proc_ul_transfer_ind /home/vagrant/magma/lte/gateway/c/oai/tasks/nas/nas_proc.c:326
#10 0x5558071bd634 in handle_message /home/vagrant/magma/lte/gateway/c/oai/tasks/mme_app/mme_app_main.c:97
#11 0x7f871bb277bd in zloop_start (/usr/lib/x86_64-linux-gnu/libczmq.so.4+0x287bd)
#12 0x5558071bf169 in mme_app_thread /home/vagrant/magma/lte/gateway/c/oai/tasks/mme_app/mme_app_main.c:447
#13 0x7f871e11f4a3 in start_thread (/lib/x86_64-linux-gnu/libpthread.so.0+0x74a3)
#14 0x7f871a494d0e in __clone (/lib/x86_64-linux-gnu/libc.so.6+0xe8d0e)
0x603000093460 is located 0 bytes inside of 32-byte region [0x603000093460,0x603000093480)
freed by thread T16 here:
#0 0x7f871e602a10 in free (/usr/lib/x86_64-linux-gnu/libasan.so.3+0xc1a10)
#1 0x5558070dc054 in free_wrapper /home/vagrant/magma/lte/gateway/c/oai/common/dynamic_memory_check.c:47
#2 0x555807545496 in nas_stop_T3489 /home/vagrant/magma/lte/gateway/c/oai/tasks/nas/esm/esm_data_context.c:103
#3 0x5558075c517a in _esm_information /home/vagrant/magma/lte/gateway/c/oai/tasks/nas/esm/esm_information.c:269
#4 0x5558075c4e15 in _esm_information_t3489_handler /home/vagrant/magma/lte/gateway/c/oai/tasks/nas/esm/esm_information.c:199
#5 0x5558074e2e8a in mme_app_nas_timer_handle_signal_expiry /home/vagrant/magma/lte/gateway/c/oai/tasks/nas/util/nas_timer.c:100
#6 0x5558071be2d2 in handle_message /home/vagrant/magma/lte/gateway/c/oai/tasks/mme_app/mme_app_main.c:235
#7 0x7f871bb277bd in zloop_start (/usr/lib/x86_64-linux-gnu/libczmq.so.4+0x287bd)
Signed-off-by: Amar Padmanabhan <[email protected]>
* Invalidate the T3849 timer id while processing esm information retransmit
The _esm_information function stops the existing T3849 timer as referenced
by the esm_ctxt datastructure timer before rescheduling a new T3849 timer
when it requests for the esm info from a UE.
Stopping the timer has a side effect of freeing up the UE related
retransmission data associated with it. This causes issues during
the T3849 timer expiry handling as the cancelled timer and the rescheduled
one reuse the same retransmission data datastructure.
Fix this by unsetting the T3849 timer in the handling of the timer expiry
as the esm_ctxt is not associated with any valid timers anymore. Further
as the timer is a oneshot timer it will be cleaned up after the processing
of the timer callback.
Signed-off-by: Amar Padmanabhan <[email protected]>
rsarwad
pushed a commit
that referenced
this pull request
Apr 19, 2021
* Add T3489 tests
Introduce a new test to validate T3489 expiry.
Credit to ulaskozat for the diff
Testing done:
Verified that an ASAN use after free occurs on timer expiry
=7031==ERROR: AddressSanitizer: heap-use-after-free on address 0x603000093460 at pc 0x555807545462 bp 0x7f87093fd2b0 sp 0x7f87093fd2a8
WRITE of size 8 at 0x603000093460 thread T16
#0 0x555807545461 in nas_stop_T3489 /home/vagrant/magma/lte/gateway/c/oai/tasks/nas/esm/esm_data_context.c:101
#1 0x5558075c47c5 in esm_proc_esm_information_response /home/vagrant/magma/lte/gateway/c/oai/tasks/nas/esm/esm_information.c:119
#2 0x55580759339b in esm_recv_information_response /home/vagrant/magma/lte/gateway/c/oai/tasks/nas/esm/sap/esm_recv.c:575
#3 0x555807551fba in _esm_sap_recv /home/vagrant/magma/lte/gateway/c/oai/tasks/nas/esm/sap/esm_sap.c:679
#4 0x555807550f33 in esm_sap_send /home/vagrant/magma/lte/gateway/c/oai/tasks/nas/esm/sap/esm_sap.c:283
#5 0x5558075195a0 in lowerlayer_data_ind /home/vagrant/magma/lte/gateway/c/oai/tasks/nas/emm/LowerLayer.c:276
#6 0x55580757848f in _emm_as_data_ind /home/vagrant/magma/lte/gateway/c/oai/tasks/nas/emm/sap/emm_as.c:688
#7 0x555807574ec4 in emm_as_send /home/vagrant/magma/lte/gateway/c/oai/tasks/nas/emm/sap/emm_as.c:180
#8 0x55580753147f in emm_sap_send /home/vagrant/magma/lte/gateway/c/oai/tasks/nas/emm/sap/emm_sap.c:105
#9 0x5558074d74fc in nas_proc_ul_transfer_ind /home/vagrant/magma/lte/gateway/c/oai/tasks/nas/nas_proc.c:326
#10 0x5558071bd634 in handle_message /home/vagrant/magma/lte/gateway/c/oai/tasks/mme_app/mme_app_main.c:97
#11 0x7f871bb277bd in zloop_start (/usr/lib/x86_64-linux-gnu/libczmq.so.4+0x287bd)
#12 0x5558071bf169 in mme_app_thread /home/vagrant/magma/lte/gateway/c/oai/tasks/mme_app/mme_app_main.c:447
#13 0x7f871e11f4a3 in start_thread (/lib/x86_64-linux-gnu/libpthread.so.0+0x74a3)
#14 0x7f871a494d0e in __clone (/lib/x86_64-linux-gnu/libc.so.6+0xe8d0e)
0x603000093460 is located 0 bytes inside of 32-byte region [0x603000093460,0x603000093480)
freed by thread T16 here:
#0 0x7f871e602a10 in free (/usr/lib/x86_64-linux-gnu/libasan.so.3+0xc1a10)
#1 0x5558070dc054 in free_wrapper /home/vagrant/magma/lte/gateway/c/oai/common/dynamic_memory_check.c:47
#2 0x555807545496 in nas_stop_T3489 /home/vagrant/magma/lte/gateway/c/oai/tasks/nas/esm/esm_data_context.c:103
#3 0x5558075c517a in _esm_information /home/vagrant/magma/lte/gateway/c/oai/tasks/nas/esm/esm_information.c:269
#4 0x5558075c4e15 in _esm_information_t3489_handler /home/vagrant/magma/lte/gateway/c/oai/tasks/nas/esm/esm_information.c:199
#5 0x5558074e2e8a in mme_app_nas_timer_handle_signal_expiry /home/vagrant/magma/lte/gateway/c/oai/tasks/nas/util/nas_timer.c:100
#6 0x5558071be2d2 in handle_message /home/vagrant/magma/lte/gateway/c/oai/tasks/mme_app/mme_app_main.c:235
#7 0x7f871bb277bd in zloop_start (/usr/lib/x86_64-linux-gnu/libczmq.so.4+0x287bd)
Signed-off-by: Amar Padmanabhan <[email protected]>
* Invalidate the T3849 timer id while processing esm information retransmit
The _esm_information function stops the existing T3849 timer as referenced
by the esm_ctxt datastructure timer before rescheduling a new T3849 timer
when it requests for the esm info from a UE.
Stopping the timer has a side effect of freeing up the UE related
retransmission data associated with it. This causes issues during
the T3849 timer expiry handling as the cancelled timer and the rescheduled
one reuse the same retransmission data datastructure.
Fix this by unsetting the T3849 timer in the handling of the timer expiry
as the esm_ctxt is not associated with any valid timers anymore. Further
as the timer is a oneshot timer it will be cleaned up after the processing
of the timer callback.
Signed-off-by: Amar Padmanabhan <[email protected]>
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Signed-off-by: rashmi [email protected]
Added code to handle T3460 timer as part of stateless MME