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author | Martin Hundebøll <martin@geanix.com> | 2019-10-08 20:44:40 +0200 |
---|---|---|
committer | Denis Kenzior <denkenz@gmail.com> | 2019-10-08 14:45:42 -0500 |
commit | 1b4ee8dbb8e44e7dbd1f389f878fc3a26f4ce543 (patch) | |
tree | 302d5559ec6c157401e628a8b4572fed0c757399 | |
parent | 78a5b4b735b24db342914042a1e7847a3913fa24 (diff) | |
download | ofono-1b4ee8dbb8e44e7dbd1f389f878fc3a26f4ce543.tar.gz |
gatmux: take reference to mux object while processing incoming data
When closing down a cmux object, the address sanitizer detects a
use-after-free in gatmux.c (see below).
Avoid this by taking a reference to the mux object during the processing
in received_data().
ofonod[3640549]: ../git/plugins/quectel.c:cfun_disable() 0x610000000b40
ofonod[3640549]: ../git/plugins/quectel.c:close_serial() 0x610000000b40
ofonod[3640549]: ../git/plugins/quectel.c:close_mux() 0x610000000b40
ofonod[3640549]: ../git/examples/emulator.c:powered_watch() Removing modem 0x610000000b40 from the list
ofonod[3640549]: ../git/examples/emulator.c:powered_watch() Removing server watch: 106
ofonod[3640549]: ../git/src/modem.c:modem_change_state() old state: 0, new state: 0
=================================================================
==3640549==ERROR: AddressSanitizer: heap-use-after-free on address 0x62100073dd28 at pc 0x5566b6402a21 bp 0x7ffe7a2db0e0 sp 0x7ffe7a2db0d0
READ of size 8 at 0x62100073dd28 thread T0
#0 0x5566b6402a20 in debug ../git/gatchat/gatmux.c:109
#1 0x5566b6404bd7 in channel_close ../git/gatchat/gatmux.c:525
#2 0x7fa0516e44a6 in g_io_channel_shutdown (/usr/lib/libglib-2.0.so.0+0x774a6)
#3 0x7fa0516e4644 in g_io_channel_unref (/usr/lib/libglib-2.0.so.0+0x77644)
#4 0x5566b64048a4 in watch_finalize ../git/gatchat/gatmux.c:474
#5 0x7fa0516d6f6f (/usr/lib/libglib-2.0.so.0+0x69f6f)
#6 0x7fa0516ac6a7 in g_slist_foreach (/usr/lib/libglib-2.0.so.0+0x3f6a7)
#7 0x7fa0516b277b in g_slist_free_full (/usr/lib/libglib-2.0.so.0+0x4577b)
#8 0x5566b6403413 in dispatch_sources ../git/gatchat/gatmux.c:224
#9 0x5566b64039ea in received_data ../git/gatchat/gatmux.c:268
#10 0x7fa0516d727e in g_main_context_dispatch (/usr/lib/libglib-2.0.so.0+0x6a27e)
#11 0x7fa0516d91c0 (/usr/lib/libglib-2.0.so.0+0x6c1c0)
#12 0x7fa0516da0d2 in g_main_loop_run (/usr/lib/libglib-2.0.so.0+0x6d0d2)
#13 0x5566b6429b1b in main ../git/src/main.c:286
#14 0x7fa05147fee2 in __libc_start_main (/usr/lib/libc.so.6+0x26ee2)
#15 0x5566b62531ad in _start (/home/martin/projects/ofono/x86/src/ofonod+0xfc1ad)
0x62100073dd28 is located 40 bytes inside of 4672-byte region [0x62100073dd00,0x62100073ef40)
freed by thread T0 here:
#0 0x7fa0519256c0 in __interceptor_free /build/gcc/src/gcc/libsanitizer/asan/asan_malloc_linux.cc:122
#1 0x5566b64052d7 in g_at_mux_unref ../git/gatchat/gatmux.c:645
#2 0x5566b63d6d19 in close_mux ../git/plugins/quectel.c:199
#3 0x5566b63d7047 in close_serial ../git/plugins/quectel.c:223
#4 0x5566b63db62a in cfun_disable ../git/plugins/quectel.c:1056
#5 0x5566b63f6ae1 in at_chat_finish_command ../git/gatchat/gatchat.c:459
#6 0x5566b63f701b in at_chat_handle_command_response ../git/gatchat/gatchat.c:521
#7 0x5566b63f785b in have_line ../git/gatchat/gatchat.c:600
#8 0x5566b63f87f1 in new_bytes ../git/gatchat/gatchat.c:759
#9 0x5566b640174c in received_data ../git/gatchat/gatio.c:122
#10 0x5566b64047b4 in watch_dispatch ../git/gatchat/gatmux.c:464
#11 0x5566b640313b in dispatch_sources ../git/gatchat/gatmux.c:183
#12 0x5566b64039ea in received_data ../git/gatchat/gatmux.c:268
#13 0x7fa0516d727e in g_main_context_dispatch (/usr/lib/libglib-2.0.so.0+0x6a27e)
previously allocated by thread T0 here:
#0 0x7fa051925ce8 in __interceptor_calloc /build/gcc/src/gcc/libsanitizer/asan/asan_malloc_linux.cc:153
#1 0x5566b6405009 in g_at_mux_new ../git/gatchat/gatmux.c:606
#2 0x5566b6407f6b in g_at_mux_new_gsm0710_basic ../git/gatchat/gatmux.c:1165
#3 0x5566b63da9ba in cmux_cb ../git/plugins/quectel.c:882
#4 0x5566b63f6ae1 in at_chat_finish_command ../git/gatchat/gatchat.c:459
#5 0x5566b63f701b in at_chat_handle_command_response ../git/gatchat/gatchat.c:521
#6 0x5566b63f785b in have_line ../git/gatchat/gatchat.c:600
#7 0x5566b63f87f1 in new_bytes ../git/gatchat/gatchat.c:759
#8 0x5566b640174c in received_data ../git/gatchat/gatio.c:122
#9 0x7fa0516d727e in g_main_context_dispatch (/usr/lib/libglib-2.0.so.0+0x6a27e)
SUMMARY: AddressSanitizer: heap-use-after-free ../git/gatchat/gatmux.c:109 in debug
Shadow bytes around the buggy address:
0x0c42800dfb50: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c42800dfb60: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c42800dfb70: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c42800dfb80: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c42800dfb90: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
=>0x0c42800dfba0: fd fd fd fd fd[fd]fd fd fd fd fd fd fd fd fd fd
0x0c42800dfbb0: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
0x0c42800dfbc0: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
0x0c42800dfbd0: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
0x0c42800dfbe0: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
0x0c42800dfbf0: 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
==3640549==ABORTING
-rw-r--r-- | gatchat/gatmux.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/gatchat/gatmux.c b/gatchat/gatmux.c index 757a5123..d50e5361 100644 --- a/gatchat/gatmux.c +++ b/gatchat/gatmux.c @@ -231,6 +231,7 @@ static gboolean received_data(GIOChannel *channel, GIOCondition cond, int i; GIOStatus status; gsize bytes_read; + gboolean buffer_full = FALSE; if (cond & G_IO_NVAL) return FALSE; @@ -255,6 +256,8 @@ static gboolean received_data(GIOChannel *channel, GIOCondition cond, if (mux->buf_used > 0) memmove(mux->buf, mux->buf + nread, mux->buf_used); + g_at_mux_ref(mux); + for (i = 1; i <= MAX_CHANNELS; i++) { int offset = i / 8; int bit = i % 8; @@ -267,6 +270,10 @@ static gboolean received_data(GIOChannel *channel, GIOCondition cond, dispatch_sources(mux->dlcs[i-1], G_IO_IN); } + + buffer_full = mux->buf_used == sizeof(mux->buf); + + g_at_mux_unref(mux); } if (cond & (G_IO_HUP | G_IO_ERR)) @@ -275,7 +282,7 @@ static gboolean received_data(GIOChannel *channel, GIOCondition cond, if (status != G_IO_STATUS_NORMAL && status != G_IO_STATUS_AGAIN) return FALSE; - if (mux->buf_used == sizeof(mux->buf)) + if (buffer_full) return FALSE; return TRUE; |