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protect memcpy's in rx sdu reassembly with boundary checks

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master
Andre Puschmann 7 years ago
parent 5fe09666d7
commit a16aa291e3
1 changed files with 49 additions and 26 deletions
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75
lib/src/upper/rlc_am.cc
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@ -128,10 +128,10 @@ void rlc_am::reset()
reordering_timeout.reset();
if(tx_sdu) {
pool->deallocate(tx_sdu);
tx_sdu = NULL;
}
if(rx_sdu)
rx_sdu->reset();
if(rx_sdu) {
pool->deallocate(rx_sdu);
}
vt_a = 0;
vt_ms = RLC_AM_WINDOW_SIZE;
@ -827,6 +827,12 @@ int rlc_am::build_data_pdu(uint8_t *payload, uint32_t nof_bytes)
rrc->get_rb_name(lcid).c_str(), to_move, pdu_space, head_len);
}
// Make sure, at least one SDU (segment) has been added until this point
if (pdu->N_bytes == 0) {
log->error("Generated empty RLC PDU.\n");
return 0;
}
if(tx_sdu)
header.fi |= RLC_FI_FIELD_NOT_END_ALIGNED; // Last byte does not correspond to last byte of SDU
@ -848,7 +854,6 @@ int rlc_am::build_data_pdu(uint8_t *payload, uint32_t nof_bytes)
// Set SN
header.sn = vt_s;
vt_s = (vt_s + 1)%MOD;
log->info("%s PDU scheduled for tx. SN: %d (%d B)\n", rrc->get_rb_name(lcid).c_str(), header.sn, pdu->N_bytes);
// Place PDU in tx_window, write header and TX
tx_window[header.sn].buf = pdu;
@ -859,6 +864,7 @@ int rlc_am::build_data_pdu(uint8_t *payload, uint32_t nof_bytes)
uint8_t *ptr = payload;
rlc_am_write_data_pdu_header(&header, &ptr);
memcpy(ptr, pdu->msg, pdu->N_bytes);
log->info_hex(payload, pdu->N_bytes, "%s PDU scheduled for tx. SN: %d (%d B)\n", rrc->get_rb_name(lcid).c_str(), header.sn, pdu->N_bytes);
debug_state();
return (ptr-payload) + pdu->N_bytes;
@ -868,8 +874,8 @@ void rlc_am::handle_data_pdu(uint8_t *payload, uint32_t nof_bytes, rlc_amd_pdu_h
{
std::map<uint32_t, rlc_amd_rx_pdu_t>::iterator it;
log->info_hex(payload, nof_bytes, "%s Rx data PDU SN: %d",
rrc->get_rb_name(lcid).c_str(), header.sn);
log->info_hex(payload, nof_bytes, "%s Rx data PDU SN: %d (%d B), %s",
rrc->get_rb_name(lcid).c_str(), header.sn, nof_bytes, rlc_fi_field_text[header.fi]);
if(!inside_rx_window(header.sn)) {
if(header.p) {
@ -1157,38 +1163,55 @@ void rlc_am::reassemble_rx_sdus()
#endif
}
}
// Iterate through rx_window, assembling and delivering SDUs
while(rx_window.end() != rx_window.find(vr_r))
{
// Handle any SDU segments
for(uint32_t i=0; i<rx_window[vr_r].header.N_li; i++)
{
int len = rx_window[vr_r].header.li[i];
memcpy(&rx_sdu->msg[rx_sdu->N_bytes], rx_window[vr_r].buf->msg, len);
rx_sdu->N_bytes += len;
rx_window[vr_r].buf->msg += len;
rx_window[vr_r].buf->N_bytes -= len;
log->info_hex(rx_sdu->msg, rx_sdu->N_bytes, "%s Rx SDU", rrc->get_rb_name(lcid).c_str());
rx_sdu->set_timestamp();
pdcp->write_pdu(lcid, rx_sdu);
rx_sdu = pool_allocate;
if (!rx_sdu) {
uint32_t len = rx_window[vr_r].header.li[i];
if (rx_sdu->get_tailroom() >= len) {
memcpy(&rx_sdu->msg[rx_sdu->N_bytes], rx_window[vr_r].buf->msg, len);
rx_sdu->N_bytes += len;
rx_window[vr_r].buf->msg += len;
rx_window[vr_r].buf->N_bytes -= len;
log->info_hex(rx_sdu->msg, rx_sdu->N_bytes, "%s Rx SDU (%d B)", rrc->get_rb_name(lcid).c_str(), rx_sdu->N_bytes);
rx_sdu->set_timestamp();
pdcp->write_pdu(lcid, rx_sdu);
rx_sdu = pool_allocate;
if (!rx_sdu) {
#ifdef RLC_AM_BUFFER_DEBUG
log->console("Fatal Error: Could not allocate PDU in reassemble_rx_sdus() (2)\n");
exit(-1);
log->console("Fatal Error: Could not allocate PDU in reassemble_rx_sdus() (2)\n");
exit(-1);
#else
log->error("Fatal Error: Could not allocate PDU in reassemble_rx_sdus() (2)\n");
return;
log->error("Fatal Error: Could not allocate PDU in reassemble_rx_sdus() (2)\n");
return;
#endif
}
} else {
log->error("Cannot fit RLC PDU in SDU buffer, dropping both.\n");
pool->deallocate(rx_sdu);
pool->deallocate(rx_window[vr_r].buf);
rx_window.erase(vr_r);
}
}
// Handle last segment
memcpy(&rx_sdu->msg[rx_sdu->N_bytes], rx_window[vr_r].buf->msg, rx_window[vr_r].buf->N_bytes);
rx_sdu->N_bytes += rx_window[vr_r].buf->N_bytes;
if(rlc_am_end_aligned(rx_window[vr_r].header.fi))
{
log->info_hex(rx_sdu->msg, rx_sdu->N_bytes, "%s Rx SDU", rrc->get_rb_name(lcid).c_str());
uint32_t len = rx_window[vr_r].buf->N_bytes;
if (rx_sdu->get_tailroom() >= len) {
memcpy(&rx_sdu->msg[rx_sdu->N_bytes], rx_window[vr_r].buf->msg, len);
rx_sdu->N_bytes += rx_window[vr_r].buf->N_bytes;
} else {
log->error("Cannot fit RLC PDU in SDU buffer, dropping both.\n");
pool->deallocate(rx_sdu);
pool->deallocate(rx_window[vr_r].buf);
rx_window.erase(vr_r);
}
if(rlc_am_end_aligned(rx_window[vr_r].header.fi)) {
log->info_hex(rx_sdu->msg, rx_sdu->N_bytes, "%s Rx SDU (%d B)", rrc->get_rb_name(lcid).c_str(), rx_sdu->N_bytes);
rx_sdu->set_timestamp();
pdcp->write_pdu(lcid, rx_sdu);
rx_sdu = pool_allocate;
@ -1250,7 +1273,7 @@ void rlc_am::print_rx_segments()
for(it=rx_segments.begin();it!=rx_segments.end();it++) {
std::list<rlc_amd_rx_pdu_t>::iterator segit;
for(segit = it->second.segments.begin(); segit != it->second.segments.end(); segit++) {
ss << " SN:" << segit->header.sn << " SO:" << segit->header.so << " N:" << segit->buf->N_bytes << std::endl;
ss << " SN:" << segit->header.sn << " SO:" << segit->header.so << " N:" << segit->buf->N_bytes << " N_li: " << segit->header.N_li << std::endl;
}
}
log->debug("%s\n", ss.str().c_str());

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