[PATCHv2] PASN: fix ASAN error in ptksa_cache_add
michael-dev at fami-braun.de
michael-dev at fami-braun.de
Fri Apr 16 07:13:12 BST 2021
From: Michael Braun <michael-dev at fami-braun.de>
==19798==ERROR: AddressSanitizer: heap-use-after-free on address 0x6110000663f8 at pc 0x55a2c485a232 bp 0x7ffeb42dcaf0 sp 0x7ffeb42dcae0
READ of size 8 at 0x6110000663f8 thread T0
Connect STA wlan0 to AP
#0 0x55a2c485a231 in ptksa_cache_add ../src/common/ptksa_cache.c:310
#1 0x55a2c4398045 in hostapd_store_ptksa ../src/ap/wpa_auth_glue.c:943
#2 0x55a2c4430980 in wpa_auth_store_ptksa ../src/ap/wpa_auth.c:232
#3 0x55a2c44578e1 in sm_WPA_PTK_PTKINITDONE_Enter ../src/ap/wpa_auth.c:3650
#4 0x55a2c44578e1 in sm_WPA_PTK_Step ../src/ap/wpa_auth.c:3798
#5 0x55a2c44578e1 in wpa_sm_step ../src/ap/wpa_auth.c:4437
#6 0x55a2c445d99d in wpa_receive ../src/ap/wpa_auth.c:1411
#7 0x55a2c43e7747 in ieee802_1x_receive ../src/ap/ieee802_1x.c:1118
#8 0x55a2c43bbf73 in hostapd_event_eapol_rx ../src/ap/drv_callbacks.c:1542
#9 0x55a2c43bbf73 in wpa_supplicant_event ../src/ap/drv_callbacks.c:1932
#10 0x55a2c466cb2d in drv_event_eapol_rx ../src/drivers/driver.h:6074
#11 0x55a2c466cb2d in nl80211_control_port_frame ../src/drivers/driver_nl80211_event.c:2822
#12 0x55a2c466cb2d in process_bss_event ../src/drivers/driver_nl80211_event.c:3194
#13 0x7feed9e90b9b in nl_cb_call ./include/netlink-private/netlink.h:145
#14 0x7feed9e90b9b in recvmsgs ./lib/nl.c:1006
#15 0x7feed9e90b9b in nl_recvmsgs_report ./lib/nl.c:1057
#16 0x7feed9e91058 in nl_recvmsgs ./lib/nl.c:1081
#17 0x55a2c45f2e8c in wpa_driver_nl80211_event_receive ../src/drivers/driver_nl80211.c:1782
#18 0x55a2c44b9afa in eloop_sock_table_dispatch ../src/utils/eloop.c:603
#19 0x55a2c44be122 in eloop_run ../src/utils/eloop.c:1228
#20 0x55a2c43360bf in hostapd_global_run /home/mbr/hostapd/hostapd/main.c:451
#21 0x55a2c43360bf in main /home/mbr/hostapd/hostapd/main.c:898
#22 0x7feed8ce20b2 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x270b2)
#23 0x55a2c432f3fd in _start (/home/mbr/hostapd/hostapd/hostapd+0x9f23fd)
0x6110000663f8 is located 184 bytes inside of 216-byte region [0x611000066340,0x611000066418)
freed by thread T0 here:
#0 0x7feeda1477cf in __interceptor_free (/usr/lib/x86_64-linux-gnu/libasan.so.5+0x10d7cf)
#1 0x55a2c44ce56b in os_free ../src/utils/os_unix.c:773
#2 0x55a2c451a986 in radius_msg_free ../src/radius/radius.c:137
#3 0x55a2c4527104 in radius_client_msg_free ../src/radius/radius_client.c:261
#4 0x55a2c452f53c in radius_client_list_add ../src/radius/radius_client.c:715
#5 0x55a2c452f53c in radius_client_send ../src/radius/radius_client.c:807
#6 0x55a2c453b24c in accounting_sta_report ../src/ap/accounting.c:352
#7 0x55a2c453d6e9 in accounting_sta_stop ../src/ap/accounting.c:384
#8 0x55a2c44190fd in ap_free_sta ../src/ap/sta_info.c:194
#9 0x55a2c4934530 in handle_deauth ../src/ap/ieee802_11.c:6035
#10 0x55a2c4934530 in ieee802_11_mgmt ../src/ap/ieee802_11.c:6399
#11 0x55a2c43bf114 in hostapd_mgmt_rx ../src/ap/drv_callbacks.c:1468
#12 0x55a2c43bf114 in wpa_supplicant_event ../src/ap/drv_callbacks.c:1912
#13 0x55a2c465faf7 in mlme_event_mgmt ../src/drivers/driver_nl80211_event.c:823
#14 0x55a2c4661774 in mlme_event ../src/drivers/driver_nl80211_event.c:1135
#15 0x55a2c466c43b in process_bss_event ../src/drivers/driver_nl80211_event.c:3177
#16 0x7feed9e90b9b in nl_cb_call ./include/netlink-private/netlink.h:145
#17 0x7feed9e90b9b in recvmsgs ./lib/nl.c:1006
#18 0x7feed9e90b9b in nl_recvmsgs_report ./lib/nl.c:1057
previously allocated by thread T0 here:
#0 0x7feeda147bc8 in malloc (/usr/lib/x86_64-linux-gnu/libasan.so.5+0x10dbc8)
#1 0x55a2c44cd387 in os_malloc ../src/utils/os_unix.c:715
#2 0x55a2c44ceb7f in os_zalloc ../src/utils/os_unix.c:779
#3 0x55a2c451a9f2 in radius_msg_new ../src/radius/radius.c:109
#4 0x55a2c4539a6e in accounting_msg ../src/ap/accounting.c:46
#5 0x55a2c453be15 in accounting_report_state ../src/ap/accounting.c:439
#6 0x55a2c453d91d in accounting_init ../src/ap/accounting.c:534
#7 0x55a2c4378952 in hostapd_setup_bss ../src/ap/hostapd.c:1333
#8 0x55a2c4382530 in hostapd_setup_interface_complete_sync ../src/ap/hostapd.c:2094
#9 0x55a2c4382815 in hostapd_setup_interface_complete ../src/ap/hostapd.c:2229
#10 0x55a2c4384100 in setup_interface2 ../src/ap/hostapd.c:1726
#11 0x55a2c4386b58 in setup_interface ../src/ap/hostapd.c:1628
#12 0x55a2c4386b58 in hostapd_setup_interface ../src/ap/hostapd.c:2318
#13 0x55a2c4387a57 in hostapd_enable_iface ../src/ap/hostapd.c:2730
#14 0x55a2c455d723 in hostapd_ctrl_iface_enable /home/mbr/hostapd/hostapd/ctrl_iface.c:1606
#15 0x55a2c455d723 in hostapd_ctrl_iface_receive_process /home/mbr/hostapd/hostapd/ctrl_iface.c:3607
#16 0x55a2c456821e in hostapd_ctrl_iface_receive /home/mbr/hostapd/hostapd/ctrl_iface.c:4018
#17 0x55a2c44b9afa in eloop_sock_table_dispatch ../src/utils/eloop.c:603
#18 0x55a2c44be122 in eloop_run ../src/utils/eloop.c:1228
#19 0x55a2c43360bf in hostapd_global_run /home/mbr/hostapd/hostapd/main.c:451
#20 0x55a2c43360bf in main /home/mbr/hostapd/hostapd/main.c:898
#21 0x7feed8ce20b2 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x270b2)
SUMMARY: AddressSanitizer: heap-use-after-free ../src/common/ptksa_cache.c:310 in ptksa_cache_add
Shadow bytes around the buggy address:
0x0c2280004c20: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c2280004c30: 00 00 fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c2280004c40: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c2280004c50: 00 00 00 00 00 00 00 00 00 fa fa fa fa fa fa fa
0x0c2280004c60: fa fa fa fa fa fa fa fa fd fd fd fd fd fd fd fd
=>0x0c2280004c70: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd[fd]
0x0c2280004c80: fd fd fd fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c2280004c90: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
0x0c2280004ca0: fd fd fd fd fd fd fd fd fd fd fd fd fa fa fa fa
0x0c2280004cb0: fa fa fa fa fa fa fa fa fd fd fd fd fd fd fd fd
0x0c2280004cc0: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
Shadow byte legend (one shadow byte represents 8 application bytes):
Addressable: 00
Partially addressable: 01 02 03 04 05 06 07
Heap left redzone: fa
Freed heap region: fd
Stack left redzone: f1
Stack mid redzone: f2
Stack right redzone: f3
Stack after return: f5
Stack use after scope: f8
Global redzone: f9
Global init order: f6
Poisoned by user: f7
Container overflow: fc
Array cookie: ac
Intra object redzone: bb
ASan internal: fe
Left alloca redzone: ca
Right alloca redzone: cb
Shadow gap: cc
==19798==ABORTING
Signed-off-by: Michael Braun <michael-dev at fami-braun.de>
---
src/common/ptksa_cache.c | 18 +++++++++---------
1 file changed, 9 insertions(+), 9 deletions(-)
diff --git a/src/common/ptksa_cache.c b/src/common/ptksa_cache.c
index 6a053d650..8fcb13507 100644
--- a/src/common/ptksa_cache.c
+++ b/src/common/ptksa_cache.c
@@ -269,7 +269,7 @@ struct ptksa_cache_entry * ptksa_cache_add(struct ptksa_cache *ptksa,
u32 life_time,
const struct wpa_ptk *ptk)
{
- struct ptksa_cache_entry *entry, *tmp;
+ struct ptksa_cache_entry *entry, *tmp, *tmp2 = NULL;
struct os_reltime now;
if (!ptksa || !ptk || !addr || !life_time || cipher == WPA_CIPHER_NONE)
@@ -296,21 +296,21 @@ struct ptksa_cache_entry * ptksa_cache_add(struct ptksa_cache *ptksa,
entry->expiration = now.sec + life_time;
dl_list_for_each(tmp, &ptksa->ptksa, struct ptksa_cache_entry, list) {
- if (tmp->expiration > entry->expiration)
+ if (tmp->expiration > entry->expiration) {
+ tmp2 = tmp;
break;
+ }
}
/*
- * If the list was empty add to the head; otherwise if the expiration is
- * later then all other entries, add it to the end of the list;
+ * If the expiration is later then all other or the list is empty
+ * entries, add it to the end of the list;
* otherwise add it before the relevant entry.
*/
- if (!tmp)
- dl_list_add(&ptksa->ptksa, &entry->list);
- else if (tmp->expiration < entry->expiration)
- dl_list_add(&tmp->list, &entry->list);
+ if (tmp2)
+ dl_list_add(&tmp2->list, &entry->list);
else
- dl_list_add_tail(&tmp->list, &entry->list);
+ dl_list_add_tail(&ptksa->ptksa, &entry->list);
ptksa->n_ptksa++;
wpa_printf(MSG_DEBUG,
--
2.20.1
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