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- Log -----------------------------------------------------------------
http://cgit.osmocom.org/osmo-bts/commit/?id=5f17e6138ebbac8d2a504429ae464d078c702b52
commit 5f17e6138ebbac8d2a504429ae464d078c702b52
Author: Pau Espin Pedrol <pespin at sysmocom.de>
Date: Wed Mar 21 19:51:46 2018 +0100
l1sap: Avoid assumption that l1sap is at head of msgb
This assumption used while sending the rx data to gsmtap in l1sap_up was
making osmo-bts-virtual crash, since that bts model is allocating the
l1sap in the stack rather than inside the msgb.
Instead, let's use the assumption that l2h is set correctly in msgb by
the bts model lower layer.
crash report:
Program received signal SIGSEGV, Segmentation fault.
0x00007ffff6234ec3 in __memmove_sse2_unaligned_erms () from /usr/lib/libc.so.6
(gdb) bt
0 0x00007ffff6234ec3 in __memmove_sse2_unaligned_erms () from /usr/lib/libc.so.6
1 0x00007ffff6dbf4c8 in gsmtap_makemsg_ex (type=<optimized out>, arfcn=arfcn at entry=17255, ts=ts at entry=6 '\006',
chan_type=<optimized out>, ss=ss at entry=0 '\000', fn=fn at entry=11249, signal_dbm=0 '\000', snr=0 '\000',
data=0x5555557d5b50 "", len=4294967263) at libosmocore/src/gsmtap_util.c:179
2 0x00007ffff6dbf6d8 in gsmtap_send_ex (gti=0x555555877f10, type=type at entry=1 '\001', arfcn=arfcn at entry=17255,
ts=ts at entry=6 '\006', chan_type=<optimized out>, ss=<optimized out>, fn=11249, signal_dbm=0 '\000', snr=0 '\000',
data=0x5555557d5b50 "", len=4294967263) at libosmocore/src/gsmtap_util.c:311
3 0x00007ffff6dbf765 in gsmtap_send (gti=<optimized out>, arfcn=arfcn at entry=17255, ts=ts at entry=6 '\006',
chan_type=<optimized out>, ss=<optimized out>, fn=fn at entry=11249, signal_dbm=0 '\000', snr=0 '\000',
data=0x5555557d5b50 "", len=4294967263) at libosmocore/src/gsmtap_util.c:330
4 0x0000555555573571 in to_gsmtap (trx=0x7ffff7ef8070, l1sap=0x7fffffffde80)
at osmo-bts/src/common/l1sap.c:397
5 0x0000555555573b9c in l1sap_up (trx=0x7ffff7ef8070, l1sap=l1sap at entry=0x7fffffffde80)
at osmo-bts/src/common/l1sap.c:1285
6 0x000055555555ec06 in virt_um_rcv_cb (vui=<optimized out>, msg=<optimized out>)
at osmo-bts/src/osmo-bts-virtual/l1_if.c:170
7 0x000055555555f5c6 in virt_um_fd_cb (ofd=0x55555587cc30, what=<optimized out>)
at osmo-bts/src/osmo-bts-virtual/virtual_um.c:50
8 0x00007ffff6db6991 in osmo_fd_disp_fds (_eset=0x7fffffffe090, _wset=0x7fffffffe010, _rset=0x7fffffffdf90)
at libosmocore/src/select.c:216
9 osmo_select_main (polling=polling at entry=0) at libosmocore/src/select.c:256
10 0x0000555555576fbc in bts_main (argc=5, argv=0x7fffffffe288)
at osmo-bts/src/common/main.c:364
11 0x00007ffff61b5f4a in __libc_start_main () from /usr/lib/libc.so.6
12 0x000055555555c4ca in _start ()
In the old code when the sizeof(osmo_phsap_prim) was being substracted
it resulted on a negative len which later was casted to unsigned int and
became a really big number.
Fixes: OS#3092
Change-Id: I51a880328497673a06d153bfb76c428265b8cbb8
-----------------------------------------------------------------------
Summary of changes:
src/common/l1sap.c | 26 +++++++++++++++-----------
1 file changed, 15 insertions(+), 11 deletions(-)
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Osmocom BTS-side code (Abis, scheduling, ...)