Mercurial > dropbear

annotate fuzzer-preauth.c @ 1384:ecdd4e8ae427 fuzz

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don't longjmp for fuzzer-preauth (temporary to debug asan)
author Matt Johnston <matt@ucc.asn.au>
date Tue, 30 May 2017 22:50:52 +0800
parents f03cfe9c76ac
children 6c92e97553f1
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 #include "fuzz.h"
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2 #include "session.h"
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3 #include "fuzz-wrapfd.h"
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4 #include "debug.h"
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5
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6 static void setup_fuzzer(void) {
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7 svr_setup_fuzzer();
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8 //debug_trace = 1;
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9 }
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10
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11 int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
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12 static int once = 0;
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13 if (!once) {
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14 setup_fuzzer();
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15 once = 1;
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16 }
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17
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18 if (fuzzer_set_input(Data, Size) == DROPBEAR_FAILURE) {
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19 return 0;
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20 }
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21
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22 // get prefix. input format is
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23 // string prefix
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24 // uint32 wrapfd seed
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25 // ... to be extended later
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26 // [bytes] ssh input stream
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27
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28 // be careful to avoid triggering buffer.c assertions
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29 if (fuzz.input->len < 8) {
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30 return 0;
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31 }
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32 size_t prefix_size = buf_getint(fuzz.input);
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33 if (prefix_size != 4) {
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34 return 0;
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35 }
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36 uint32_t wrapseed = buf_getint(fuzz.input);
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37 wrapfd_setseed(wrapseed);
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38
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39 int fakesock = 20;
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40 wrapfd_add(fakesock, fuzz.input, PLAIN);
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41
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42 m_malloc_set_epoch(1);
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43 // temporarily disable setjmp to debug asan segv
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44 svr_session(fakesock, fakesock);
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45 #if 0
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46 if (setjmp(fuzz.jmp) == 0) {
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47 svr_session(fakesock, fakesock);
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48 m_malloc_free_epoch(1, 0);
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49 } else {
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50 m_malloc_free_epoch(1, 1);
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51 TRACE(("dropbear_exit longjmped"))
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52 // dropbear_exit jumped here
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53 }
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54 #endif
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55
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56 return 0;
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57 }