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ListFileLexer: fix heap-buffer-overflow on malicious input
In case a list file contains a null terminated string that is continued
until a later space, the lexer token information got inconsistent:
e.g. an argument "TEST\0FOOBAR" is passed by the lexer as a token
char* = "TEST\0FOOBAR" and length 11
^^ note: ascii 0x00
Using strdup in cmListFileLexer leads lexer->token.text to be allocated
with size 5 and lexer->token.length to be set to 11
A subsequent call to this function with an argument of 5 < length <= 11
wrongly assumed a sufficiently sized buffer and therefore corrupted the
heap buffer. The program might crash due to this corruption.
The case "NullTerminatedArgument" is intentionally using a quite large
'rest' to increase the chance to actually hit the issue. It will reliably
crash with address sanitizer enabled though.
This fix addresses all rules where arbitrary characters are matched to
ignore \0 in order to fall through to the rule that matches an arbitrary
character as BadCharacter.
Signed-off-by: Matthias Maennich <matthias@maennich.net>
This commit is contained in:
Matthias Maennich
Brad King
parent
f4aa346538
commit
14d9a11be9
@ -576,16 +576,16 @@ struct yy_trans_info
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flex_int32_t yy_verify;
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flex_int32_t yy_nxt;
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};
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static const flex_int16_t yy_accept[77] =
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static const flex_int16_t yy_accept[81] =
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{ 0,
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0, 0, 0, 0, 0, 0, 0, 0, 4, 4,
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25, 13, 22, 1, 16, 3, 13, 5, 6, 7,
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15, 23, 17, 19, 20, 21, 10, 11, 8, 12,
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9, 4, 13, 0, 13, 0, 22, 0, 0, 7,
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13, 0, 13, 0, 2, 0, 13, 17, 0, 18,
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10, 8, 4, 0, 14, 0, 0, 0, 0, 14,
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0, 0, 14, 0, 0, 0, 2, 14, 0, 0,
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0, 0, 0, 0, 0, 0
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15, 23, 23, 17, 19, 20, 21, 17, 10, 11,
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8, 10, 12, 9, 24, 4, 13, 0, 13, 0,
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22, 0, 0, 7, 13, 0, 13, 0, 2, 0,
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13, 17, 0, 18, 10, 8, 4, 0, 14, 0,
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0, 0, 0, 14, 0, 0, 14, 0, 0, 0,
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2, 14, 0, 0, 0, 0, 0, 0, 0, 0
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} ;
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static const YY_CHAR yy_ec[256] =
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@ -620,104 +620,122 @@ static const YY_CHAR yy_ec[256] =
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1, 1, 1, 1, 1
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} ;
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static const YY_CHAR yy_meta[16] =
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static const YY_CHAR yy_meta[17] =
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{ 0,
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1, 1, 2, 3, 4, 3, 1, 3, 5, 6,
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1, 6, 1, 1, 7
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1, 6, 1, 1, 7, 8
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} ;
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static const flex_int16_t yy_base[95] =
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static const flex_int16_t yy_base[99] =
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{ 0,
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0, 0, 13, 25, 14, 16, 17, 18, 90, 88,
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88, 39, 20, 237, 237, 74, 78, 237, 237, 13,
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54, 0, 71, 237, 237, 31, 0, 237, 73, 237,
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237, 0, 0, 65, 75, 0, 33, 30, 72, 0,
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0, 75, 70, 0, 74, 0, 0, 62, 70, 237,
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0, 63, 0, 85, 99, 65, 111, 62, 34, 0,
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54, 116, 0, 54, 127, 51, 237, 50, 0, 48,
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47, 39, 33, 29, 17, 237, 136, 143, 150, 157,
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164, 171, 178, 184, 191, 198, 201, 207, 214, 217,
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219, 225, 228, 230
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0, 0, 14, 28, 42, 56, 70, 84, 18, 19,
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69, 100, 16, 323, 323, 55, 59, 323, 323, 13,
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115, 0, 323, 52, 323, 323, 21, 51, 0, 323,
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53, 0, 323, 323, 323, 0, 0, 126, 55, 0,
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25, 25, 53, 0, 0, 136, 53, 0, 57, 0,
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0, 42, 50, 323, 0, 43, 0, 146, 160, 45,
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172, 43, 26, 0, 42, 184, 0, 42, 195, 40,
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323, 40, 0, 38, 37, 34, 32, 31, 23, 323,
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211, 219, 227, 235, 243, 251, 259, 267, 274, 281,
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285, 291, 298, 302, 304, 310, 314, 316
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} ;
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static const flex_int16_t yy_def[95] =
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static const flex_int16_t yy_def[99] =
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{ 0,
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76, 1, 77, 77, 78, 78, 79, 79, 80, 80,
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76, 76, 76, 76, 76, 76, 12, 76, 76, 12,
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76, 81, 82, 76, 76, 82, 83, 76, 76, 76,
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76, 84, 12, 85, 12, 86, 76, 76, 87, 20,
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12, 88, 12, 21, 76, 89, 12, 82, 82, 76,
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83, 76, 84, 85, 76, 54, 85, 90, 76, 55,
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87, 88, 55, 62, 88, 91, 76, 55, 92, 93,
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90, 94, 91, 93, 94, 0, 76, 76, 76, 76,
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76, 76, 76, 76, 76, 76, 76, 76, 76, 76,
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76, 76, 76, 76
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80, 1, 81, 81, 82, 82, 83, 83, 84, 84,
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80, 80, 80, 80, 80, 80, 12, 80, 80, 12,
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80, 85, 80, 86, 80, 80, 86, 86, 87, 80,
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80, 87, 80, 80, 80, 88, 12, 89, 12, 90,
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80, 80, 91, 20, 12, 92, 12, 21, 80, 93,
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12, 86, 86, 80, 87, 80, 88, 89, 80, 58,
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89, 94, 80, 59, 91, 92, 59, 66, 92, 95,
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80, 59, 96, 97, 94, 98, 95, 97, 98, 0,
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80, 80, 80, 80, 80, 80, 80, 80, 80, 80,
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80, 80, 80, 80, 80, 80, 80, 80
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} ;
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static const flex_int16_t yy_nxt[253] =
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static const flex_int16_t yy_nxt[340] =
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{ 0,
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12, 13, 14, 13, 15, 16, 17, 18, 19, 12,
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12, 20, 21, 22, 12, 24, 28, 25, 28, 28,
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28, 37, 40, 37, 40, 62, 26, 24, 29, 25,
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29, 31, 31, 50, 37, 48, 37, 54, 26, 33,
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59, 63, 45, 34, 59, 35, 45, 62, 33, 33,
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33, 33, 36, 33, 41, 55, 54, 58, 42, 63,
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43, 72, 60, 41, 44, 41, 45, 46, 41, 55,
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55, 56, 70, 52, 48, 49, 67, 66, 57, 63,
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60, 64, 58, 52, 49, 39, 38, 76, 65, 55,
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14, 56, 14, 76, 76, 76, 76, 76, 57, 55,
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12, 20, 21, 22, 12, 23, 25, 41, 26, 41,
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14, 14, 44, 54, 44, 52, 41, 27, 41, 28,
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25, 66, 26, 35, 35, 63, 63, 49, 49, 58,
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67, 27, 66, 28, 30, 59, 58, 62, 67, 76,
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64, 59, 74, 56, 52, 53, 31, 32, 30, 71,
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70, 64, 62, 56, 53, 53, 43, 42, 80, 80,
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31, 32, 30, 80, 80, 80, 80, 80, 80, 80,
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80, 80, 80, 80, 34, 35, 30, 80, 80, 80,
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80, 80, 80, 80, 80, 80, 80, 80, 34, 35,
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76, 76, 76, 34, 76, 68, 76, 76, 55, 55,
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55, 55, 69, 55, 54, 76, 54, 76, 54, 54,
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63, 76, 64, 76, 76, 76, 76, 76, 76, 65,
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62, 76, 62, 76, 62, 62, 23, 23, 23, 23,
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23, 23, 23, 27, 27, 27, 27, 27, 27, 27,
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30, 30, 30, 30, 30, 30, 30, 32, 32, 32,
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32, 32, 32, 32, 47, 76, 47, 47, 47, 47,
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47, 48, 76, 48, 76, 48, 48, 48, 51, 76,
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51, 51, 51, 51, 53, 76, 53, 53, 53, 53,
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53, 54, 76, 76, 54, 76, 54, 54, 33, 76,
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37, 80, 80, 80, 38, 80, 39, 80, 80, 37,
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37, 37, 37, 40, 37, 45, 80, 80, 80, 46,
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80, 47, 80, 80, 45, 48, 45, 49, 50, 45,
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59, 80, 60, 80, 80, 80, 80, 80, 80, 61,
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67, 80, 68, 80, 80, 80, 80, 80, 80, 69,
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59, 80, 60, 80, 80, 80, 80, 80, 80, 61,
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59, 80, 80, 80, 38, 80, 72, 80, 80, 59,
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59, 59, 59, 73, 59, 58, 80, 58, 80, 58,
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58, 80, 80, 80, 80, 80, 80, 58, 67, 80,
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68, 80, 80, 80, 80, 80, 80, 69, 66, 80,
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33, 33, 33, 33, 33, 61, 61, 62, 76, 76,
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62, 76, 62, 62, 41, 76, 41, 41, 41, 41,
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41, 71, 71, 73, 73, 55, 76, 55, 55, 55,
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55, 55, 74, 74, 75, 75, 11, 76, 76, 76,
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76, 76, 76, 76, 76, 76, 76, 76, 76, 76,
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76, 76
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66, 80, 66, 66, 80, 80, 80, 80, 80, 80,
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66, 24, 24, 24, 24, 24, 24, 24, 24, 29,
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29, 29, 29, 29, 29, 29, 29, 33, 33, 33,
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33, 33, 33, 33, 33, 36, 36, 36, 36, 36,
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36, 36, 36, 51, 80, 51, 51, 51, 51, 51,
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51, 52, 80, 52, 80, 52, 52, 52, 52, 55,
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80, 55, 55, 55, 55, 80, 55, 57, 80, 57,
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57, 57, 57, 57, 58, 80, 80, 58, 80, 58,
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58, 37, 80, 37, 37, 37, 37, 37, 37, 65,
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65, 66, 80, 80, 66, 80, 66, 66, 45, 80,
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45, 45, 45, 45, 45, 45, 75, 75, 77, 77,
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59, 80, 59, 59, 59, 59, 59, 59, 78, 78,
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79, 79, 11, 80, 80, 80, 80, 80, 80, 80,
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80, 80, 80, 80, 80, 80, 80, 80, 80
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} ;
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static const flex_int16_t yy_chk[253] =
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static const flex_int16_t yy_chk[340] =
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{ 0,
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 3, 5, 3, 6, 7,
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8, 13, 20, 13, 20, 75, 3, 4, 5, 4,
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6, 7, 8, 26, 37, 26, 37, 74, 4, 12,
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38, 73, 38, 12, 59, 12, 59, 72, 12, 12,
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12, 12, 12, 12, 21, 71, 70, 68, 21, 66,
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21, 64, 61, 21, 21, 21, 21, 21, 21, 34,
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58, 34, 56, 52, 49, 48, 45, 43, 34, 42,
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39, 42, 35, 29, 23, 17, 16, 11, 42, 54,
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10, 54, 9, 0, 0, 0, 0, 0, 54, 55,
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1, 1, 1, 1, 1, 1, 3, 13, 3, 13,
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9, 10, 20, 27, 20, 27, 41, 3, 41, 3,
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4, 79, 4, 9, 10, 42, 63, 42, 63, 78,
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77, 4, 76, 4, 5, 75, 74, 72, 70, 68,
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65, 62, 60, 56, 53, 52, 5, 5, 6, 49,
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47, 43, 39, 31, 28, 24, 17, 16, 11, 0,
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6, 6, 7, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 7, 7, 8, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 8, 8,
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0, 0, 0, 55, 0, 55, 0, 0, 55, 55,
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55, 55, 55, 55, 57, 0, 57, 0, 57, 57,
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62, 0, 62, 0, 0, 0, 0, 0, 0, 62,
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65, 0, 65, 0, 65, 65, 77, 77, 77, 77,
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77, 77, 77, 78, 78, 78, 78, 78, 78, 78,
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79, 79, 79, 79, 79, 79, 79, 80, 80, 80,
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80, 80, 80, 80, 81, 0, 81, 81, 81, 81,
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81, 82, 0, 82, 0, 82, 82, 82, 83, 0,
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83, 83, 83, 83, 84, 0, 84, 84, 84, 84,
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84, 85, 0, 0, 85, 0, 85, 85, 86, 0,
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12, 0, 0, 0, 12, 0, 12, 0, 0, 12,
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12, 12, 12, 12, 12, 21, 0, 0, 0, 21,
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0, 21, 0, 0, 21, 21, 21, 21, 21, 21,
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38, 0, 38, 0, 0, 0, 0, 0, 0, 38,
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46, 0, 46, 0, 0, 0, 0, 0, 0, 46,
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58, 0, 58, 0, 0, 0, 0, 0, 0, 58,
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59, 0, 0, 0, 59, 0, 59, 0, 0, 59,
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59, 59, 59, 59, 59, 61, 0, 61, 0, 61,
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61, 0, 0, 0, 0, 0, 0, 61, 66, 0,
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66, 0, 0, 0, 0, 0, 0, 66, 69, 0,
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86, 86, 86, 86, 86, 87, 87, 88, 0, 0,
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88, 0, 88, 88, 89, 0, 89, 89, 89, 89,
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89, 90, 90, 91, 91, 92, 0, 92, 92, 92,
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92, 92, 93, 93, 94, 94, 76, 76, 76, 76,
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76, 76, 76, 76, 76, 76, 76, 76, 76, 76,
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76, 76
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69, 0, 69, 69, 0, 0, 0, 0, 0, 0,
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69, 81, 81, 81, 81, 81, 81, 81, 81, 82,
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82, 82, 82, 82, 82, 82, 82, 83, 83, 83,
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83, 83, 83, 83, 83, 84, 84, 84, 84, 84,
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84, 84, 84, 85, 0, 85, 85, 85, 85, 85,
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85, 86, 0, 86, 0, 86, 86, 86, 86, 87,
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0, 87, 87, 87, 87, 0, 87, 88, 0, 88,
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88, 88, 88, 88, 89, 0, 0, 89, 0, 89,
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89, 90, 0, 90, 90, 90, 90, 90, 90, 91,
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91, 92, 0, 0, 92, 0, 92, 92, 93, 0,
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93, 93, 93, 93, 93, 93, 94, 94, 95, 95,
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96, 0, 96, 96, 96, 96, 96, 96, 97, 97,
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98, 98, 80, 80, 80, 80, 80, 80, 80, 80,
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80, 80, 80, 80, 80, 80, 80, 80, 80
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} ;
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/* Table of booleans, true if rule could match eol. */
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@ -1075,13 +1093,13 @@ yy_match:
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while ( yy_chk[yy_base[yy_current_state] + yy_c] != yy_current_state )
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{
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yy_current_state = (int) yy_def[yy_current_state];
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if ( yy_current_state >= 77 )
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if ( yy_current_state >= 81 )
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yy_c = yy_meta[yy_c];
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}
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yy_current_state = yy_nxt[yy_base[yy_current_state] + yy_c];
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++yy_cp;
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}
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while ( yy_base[yy_current_state] != 237 );
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while ( yy_base[yy_current_state] != 323 );
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yy_find_action:
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yy_act = yy_accept[yy_current_state];
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@ -1647,7 +1665,7 @@ static int yy_get_next_buffer (yyscan_t yyscanner)
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for ( yy_cp = yyg->yytext_ptr + YY_MORE_ADJ; yy_cp < yyg->yy_c_buf_p; ++yy_cp )
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{
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YY_CHAR yy_c = (*yy_cp ? yy_ec[YY_SC_TO_UI(*yy_cp)] : 1);
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YY_CHAR yy_c = (*yy_cp ? yy_ec[YY_SC_TO_UI(*yy_cp)] : 16);
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if ( yy_accept[yy_current_state] )
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{
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yyg->yy_last_accepting_state = yy_current_state;
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@ -1656,7 +1674,7 @@ static int yy_get_next_buffer (yyscan_t yyscanner)
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while ( yy_chk[yy_base[yy_current_state] + yy_c] != yy_current_state )
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{
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yy_current_state = (int) yy_def[yy_current_state];
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if ( yy_current_state >= 77 )
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if ( yy_current_state >= 81 )
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yy_c = yy_meta[yy_c];
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}
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yy_current_state = yy_nxt[yy_base[yy_current_state] + yy_c];
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@ -1676,7 +1694,7 @@ static int yy_get_next_buffer (yyscan_t yyscanner)
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struct yyguts_t * yyg = (struct yyguts_t*)yyscanner; /* This var may be unused depending upon options. */
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char *yy_cp = yyg->yy_c_buf_p;
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YY_CHAR yy_c = 1;
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YY_CHAR yy_c = 16;
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if ( yy_accept[yy_current_state] )
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{
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yyg->yy_last_accepting_state = yy_current_state;
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@ -1685,11 +1703,11 @@ static int yy_get_next_buffer (yyscan_t yyscanner)
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while ( yy_chk[yy_base[yy_current_state] + yy_c] != yy_current_state )
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{
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yy_current_state = (int) yy_def[yy_current_state];
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if ( yy_current_state >= 77 )
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if ( yy_current_state >= 81 )
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yy_c = yy_meta[yy_c];
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}
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yy_current_state = yy_nxt[yy_base[yy_current_state] + yy_c];
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yy_is_jam = (yy_current_state == 76);
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yy_is_jam = (yy_current_state == 80);
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(void)yyg;
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return yy_is_jam ? 0 : yy_current_state;
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@ -74,7 +74,7 @@ static void cmListFileLexerDestroy(cmListFileLexer* lexer);
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%x COMMENT
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MAKEVAR \$\([A-Za-z0-9_]*\)
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UNQUOTED ([^ \t\r\n\(\)#\\\"[=]|\\.)
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UNQUOTED ([^ \0\t\r\n\(\)#\\\"[=]|\\.)
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LEGACY {MAKEVAR}|{UNQUOTED}|\"({MAKEVAR}|{UNQUOTED}|[ \t[=])*\"
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%%
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@ -113,7 +113,7 @@ LEGACY {MAKEVAR}|{UNQUOTED}|\"({MAKEVAR}|{UNQUOTED}|[ \t[=])*\"
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BEGIN(COMMENT);
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}
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<COMMENT>.* {
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<COMMENT>[^\0\n]* {
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lexer->column += yyleng;
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}
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@ -168,7 +168,7 @@ LEGACY {MAKEVAR}|{UNQUOTED}|\"({MAKEVAR}|{UNQUOTED}|[ \t[=])*\"
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BEGIN(BRACKET);
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}
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<BRACKET,BRACKETEND>. {
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<BRACKET,BRACKETEND>[^\0\n] {
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cmListFileLexerAppend(lexer, yytext, yyleng);
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lexer->column += yyleng;
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BEGIN(BRACKET);
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@ -231,7 +231,7 @@ LEGACY {MAKEVAR}|{UNQUOTED}|\"({MAKEVAR}|{UNQUOTED}|[ \t[=])*\"
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return 1;
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}
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<STRING>. {
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<STRING>[^\0\n] {
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cmListFileLexerAppend(lexer, yytext, yyleng);
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lexer->column += yyleng;
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}
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1
Tests/RunCMake/Syntax/NullTerminatedArgument-result.txt
Normal file
1
Tests/RunCMake/Syntax/NullTerminatedArgument-result.txt
Normal file
@ -0,0 +1 @@
|
||||
1
|
||||
5
Tests/RunCMake/Syntax/NullTerminatedArgument-stderr.txt
Normal file
5
Tests/RunCMake/Syntax/NullTerminatedArgument-stderr.txt
Normal file
@ -0,0 +1,5 @@
|
||||
CMake Error at NullTerminatedArgument.cmake:1:
|
||||
Parse error. Function missing ending "\)". Instead found bad character
|
||||
with text "".
|
||||
Call Stack \(most recent call first\):
|
||||
CMakeLists.txt:3 \(include\)
|
||||
BIN
Tests/RunCMake/Syntax/NullTerminatedArgument.cmake
Normal file
BIN
Tests/RunCMake/Syntax/NullTerminatedArgument.cmake
Normal file
Binary file not shown.
@ -55,6 +55,7 @@ run_cmake(BracketNoSpace5)
|
||||
run_cmake(Escape1)
|
||||
run_cmake(Escape2)
|
||||
run_cmake(EscapeCharsAllowed)
|
||||
run_cmake(NullTerminatedArgument)
|
||||
include("${RunCMake_SOURCE_DIR}/EscapeCharsDisallowed.cmake")
|
||||
run_cmake(ParenNoSpace0)
|
||||
run_cmake(ParenNoSpace1)
|
||||
|
||||
Loading…
Reference in New Issue
Block a user