mirror of
https://git.soft.fish/val/MicroCorruption.git
synced 2024-11-22 09:45:59 +00:00
Changes from August 15
This commit is contained in:
parent
417ec16b59
commit
3532abb66e
@ -17,7 +17,7 @@ while True:
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h = hash(bytes.fromhex(line[1:]));
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else:
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h = hash(line.encode())
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print(f"hash: {h:x}, box: {h&7:x}");
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print(f"hash: {h:x}, box[3]: {h&7:x}, box[4]: {h&0xf:x}");
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except EOFError:
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break
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@ -8,12 +8,12 @@ u16 walk (u16 r15);
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u16 run ();
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u16 *create_hash_table (u16 r15, u16 r14);
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u16 add_to_table (u16 r15, u16 r14, u16 r13);
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u16 add_to_table (u16 *table, char *username, u16 pin);
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// Return address of a buffer from the table
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// r15 = buffer address. r14
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u16 get_from_table (void *r15, char *r14);
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u16 hash (char *str);
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u16 rehash (u16 r15, u16 r14);
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u16 rehash (u16 *table, u16 r14);
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// Strings, named after the position of the first character in memory
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// Strings associated with <walk>
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@ -108,8 +108,23 @@ u16 hash (char *addr) {
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return hash;
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}
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u16 add_to_table (u16 r15, u16 r14, u16 r13) {
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u16 add_to_table (u16 *table, char *username, u16 pin) {
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// todo: add_to_table
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u16 r14 = table[1]; // Box bitmask exponent? 3
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u16 r12 = table[2]; // Box bitmask mantissa? 5
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//! What the hell is going on here?
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r12 <<= r14; // 3 <<= 5
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if (r12 < 0) {
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r12 = r12 + 3;
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}
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r12 >>= 2;
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if (table[0] < r12) { // if there are more names in table than 10:
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rehash(*table, r14); // Make more boxes, and shuffle them around?
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}
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table[0]++;
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hash(r14);
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r12 = 1 << table[1];
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// Then do some boring stuff
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return 0;
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}
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@ -124,7 +139,8 @@ u16 get_from_table (void *r15, char *r14) {
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return 0;
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}
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u16 rehash (u16 r15, u16 r14) {
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// todo: this function is very long and performs dynalloc
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u16 rehash (u16 *table, u16 exponent) { // Now I see the problem
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// This function makes the hash table 2^exponent units long
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// and rehashes all the usernames stored in each box
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return 0;
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}
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@ -23,13 +23,39 @@ u16 get_w (u16 *addr) {
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}
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void *_malloc (u16 size) {
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// if heap not initialized, initialize the heap
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// if (get_w (HEAP_BASE + 4)) {
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// u16 heap_ptr = HEAP_BASE;
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// set_w (heap_ptr, HEAP_BASE);
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// set_w (heap_ptr + 2, HEAP_BASE);
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// }
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// create a new block on the heap
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/*
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4678: 0b12 push r11
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467a: c293 0424 tst.b &0x2404
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467e: 0f24 jz $+0x20 <malloc+0x26>
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4680: 1e42 0024 mov &0x2400, r14
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4684: 8e4e 0000 mov r14, 0x0(r14)
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4688: 8e4e 0200 mov r14, 0x2(r14)
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468c: 1d42 0224 mov &0x2402, r13
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4690: 3d50 faff add #0xfffa, r13
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4694: 0d5d add r13, r13
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4696: 8e4d 0400 mov r13, 0x4(r14)
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469a: c243 0424 mov.b #0x0, &0x2404
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; malloc+0x26:
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469e: 1b42 0024 mov &0x2400, r11
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46a2: 0e4b mov r11, r14
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46a4: 1d4e 0400 mov 0x4(r14), r13
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46a8: 1db3 bit #0x1, r13
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46aa: 2820 jnz $+0x52 <46fc>
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46fc: 0d4e mov r14, r13
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46fe: 1e4e 0200 mov 0x2(r14), r14
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4702: 0e9d cmp r13, r14
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4704: 0228 jnc $+0x6 <malloc+0x92>
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4706: 0e9b cmp r11, r14
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4708: cd23 jnz $-0x64 <malloc+0x2c>
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; puts("Heap exhausted. Aborting")
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470a: 3f40 5e46 mov #0x465e, r15
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470e: b012 504d call #0x4d50 <puts>
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4712: 3040 3e44 br #0x443e <__stop_progExec__>
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4716: 0f43 clr r15
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4718: 3b41 pop r11
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471a: 3041 ret
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*/
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// return the address of the new block
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return 0;
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@ -3,14 +3,14 @@ Hash Table, plus one full box:
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5000: 0050 1050 1500 0b00 0300 0500 1650 2c50 .P.P.........P,P
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5010: 0050 2650 2100 4250 a250 0251 6251 c251 .P&P!.BP.P.QbQ.Q
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5020: 2252 8252 e252 1050 3c50 2100 0a00 0000 "R.R.R.P<P!.....
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5020: 2252 8252 e252 1050 3c50 2100 0b00 0000 "R.R.R.P<P!.....
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5030: 0000 0000 0000 0000 0000 0000 2650 9c50 ............&P.P
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5040: b500 4141 4141 4141 4141 4141 4141 4141 ..AAAAAAAAAAAAAA
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5050: 4100 e004 4141 4141 4141 4141 4141 4141 A...AAAAAAAAAAAA
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5060: 4141 4100 e004 4141 4141 4141 4141 4141 AAA...AAAAAAAAAA
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5070: 4141 4141 4100 e004 4141 4141 4141 4141 AAAAA...AAAAAAAA
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5080: 4141 4141 4141 4100 e004 4141 4141 4141 AAAAAAA...AAAAAA
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5090: 4141 4141 4141 4141 4100 e004 4141 4141 AAAAAAAAA...AAAA
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5090: 4141 4141 4141 4141 4100 e004 4141 4141 AAAAAAAAA...AAAA ; wait a second
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50a0: 4141 4141 4141 4141 4141 4100 e004 4141 AAAAAAAAAAA...AA
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50b0: 4141 4141 4141 4141 4141 4141 4100 e004 AAAAAAAAAAAAA...
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50c0: 4141 4141 4141 4141 4141 4141 4141 4100 AAAAAAAAAAAAAAA.
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@ -19,7 +19,7 @@ Hash Table, plus one full box:
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50f0: 4141 4100 e004 4141 4141 4800 9c50 5c51 AAA...AAAAH..P\Q
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5100: b500 0000 0000 e004 0000 0000 0000 0000 ................
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Heap metadata @ 4d9e:
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Heap metadata @ 2400: 0050 0080 0000
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Heap start: 0x5000
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Heap size: 0x8000 (0x5000-0xD000)
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@ -31,7 +31,7 @@ Data: 0b00 0300 0500 1650 2c50
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02: 0003: Parameter 1 (Box bitmask = 2^(<3>+1) - 1)
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04: 0005: Parameter 2 (Rightshift?)
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06: 5016: & Box Pointer List
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08: 502c: & Other Data Section
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08: 502c: & Per-box User Count List
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Box Pointer List:
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Box list header metadata @ 5010: 0050 2650 2100
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@ -50,3 +50,11 @@ Other Data Section (?)
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Section header metadata @ 5026: 1050 3c50 2100
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[ Prev: 5010, Next: 503c, Size: 0010 ]
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Data: 0a00 0000 0000 0000 0000 0000 0000 0000
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The Exploit:
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When an 11th user is added, the software will attempt to double the size of the heap. Overwriting a heap Next pointer allows us toAAAA
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for c in ['1', '9', 'A', 'I', 'Q', '0', '8', '@', 'H', 'P', 'AAAAAAAAAAAAAAAA', '']:
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print(f'new {c} ;',end="")
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@ -304,6 +304,7 @@
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46a4: 1d4e 0400 mov 0x4(r14), r13
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46a8: 1db3 bit #0x1, r13
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46aa: 2820 jnz $+0x52 <malloc+0x84>
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; This is all initialization
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46ac: 0c4d mov r13, r12
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46ae: 12c3 clrc
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46b0: 0c10 rrc r12
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@ -339,6 +340,7 @@
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4704: 0228 jnc $+0x6 <malloc+0x92>
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4706: 0e9b cmp r11, r14
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4708: cd23 jnz $-0x64 <malloc+0x2c>
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; puts("Heap exhausted. Aborting")
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470a: 3f40 5e46 mov #0x465e, r15
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470e: b012 504d call #0x4d50 <puts>
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4712: 3040 3e44 br #0x443e <__stop_progExec__>
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@ -479,24 +481,33 @@ hash_loop_start:
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483e: 1e4f 0200 mov 0x2(r15), r14
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4842: 1c4f 0400 mov 0x4(r15), r12
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4846: 0f4e mov r14, r15
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; r12 << r15
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4848: 0f93 tst r15
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484a: 0324 jz $+0x8 <add_to_table+0x20>
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484c: 0c5c add r12, r12
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484c: 0c5c add r12, r12 ; RLA r12
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484e: 1f83 dec r15
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4850: fd23 jnz $-0x4 <add_to_table+0x1a>
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; if (r12 < 0):
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4852: 0c93 tst r12
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4854: 0234 jge $+0x6 <add_to_table+0x28>
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; r12 = (r12 + 3) >> 1
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4856: 3c50 0300 add #0x3, r12
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485a: 0c11 rra r12
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; r12 >>= 1
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485c: 0c11 rra r12
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; if (r11[0] < r12):
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485e: 2c9b cmp @r11, r12
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4860: 0434 jge $+0xa <add_to_table+0x38>
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; rehash(r14, r11)
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4862: 1e53 inc r14
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4864: 0f4b mov r11, r15
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4866: b012 d448 call #0x48d4 <rehash>
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; *r11++
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486a: 9b53 0000 inc 0x0(r11)
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; r15 = hash (r10)
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486e: 0f4a mov r10, r15
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4870: b012 0e48 call #0x480e <hash>
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; r12 = (1 << r11[2]) - 1
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4874: 1c43 mov #0x1, r12
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4876: 1e4b 0200 mov 0x2(r11), r14
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487a: 0e93 tst r14
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@ -505,6 +516,7 @@ hash_loop_start:
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4880: 1e83 dec r14
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4882: fd23 jnz $-0x4 <add_to_table+0x4c>
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4884: 3c53 add #-0x1, r12
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4886: 0cff and r15, r12
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4888: 0c5c add r12, r12
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488a: 1f4b 0800 mov 0x8(r11), r15
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@ -522,17 +534,20 @@ hash_loop_start:
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48a6: 1e53 inc r14
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48a8: 8f4e 0000 mov r14, 0x0(r15)
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48ac: 0f43 clr r15
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48ae: 093c jmp $+0x14 <add_to_table+0x90>
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48ae: 093c jmp $+0x14 <add_to_table+0x90> ; A
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; *C
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48b0: 0b4c mov r12, r11
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48b2: 0b5f add r15, r11
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48b4: cb4e 0000 mov.b r14, 0x0(r11)
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48b8: 1f53 inc r15
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48ba: 3f90 0f00 cmp #0xf, r15
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48be: 0424 jz $+0xa <add_to_table+0x96>
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48be: 0424 jz $+0xa <add_to_table+0x96> ; B
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48c0: 1a53 inc r10
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; *A
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48c2: 6e4a mov.b @r10, r14
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48c4: 4e93 tst.b r14
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48c6: f423 jnz $-0x16 <add_to_table+0x7e>
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48c6: f423 jnz $-0x16 <add_to_table+0x7e> ; C
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; *B
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48c8: 8c49 1000 mov r9, 0x10(r12)
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48cc: 3941 pop r9
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48ce: 3a41 pop r10
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