Comments (1)
kevindevos
commented on June 12, 2024
{
"bytes": 4,
"type": "int",
"name": "control",
"address": "rbp-0x4"
},
{
"bytes": 64,
"type": "buffer",
"name": "buf1",
"address": "rbp-0x70"
},
{
"bytes": 32,
"type": "buffer",
"name": "buf2",
"address": "rbp-0x30"
}
],
int control;
char buf2[32];
char buf1[64];
control = 3;
fgets(buf1, 45, stdin);
strcpy(buf2, buf1);
Se vires, são lidos 45 bytes para buf1, tudo bem. Agora em strcpy, estás a copiar 45 bytes para um buffer de 32, que começa em rbp-0x30 ou seja , escreves desde rbp-0x30 sobre rbp-0x10, até rbp-0x03 inclusivé, causando overflow de control, e invalid access no primeiro endereço não alocado a nenhuma var local que é rbp-0x10 como esperado.
Se olhares para o assembly, é o que esta a ser feito. É isto ou estás te a referir ao código objeto mesmo ou a compiilar e a correr? Porque isso também variava por maquina
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Related Issues (8)
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