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data/bypassing-stack-protector: Fix canary overwrite #208

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data/bypassing-stack-protector: Fix canary overwrite #208

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9 changes: 6 additions & 3 deletions ...ata/memory-security/drills/tasks/bypassing-stack-protector/solution/src/stack_protector.c
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Original file line number Diff line number Diff line change
Expand Up @@ -19,12 +19,15 @@ void fun1(char *p)
}

printf("overwrite canary:\n");
/* TODO 1: Add code that overwrites the canary. */
addr[6] = 0;
/* TODO 1: Add code that overwrites the canary.
* Note: You should get a stack smashing detected error.
* Remove the overwrite after getting the error in order to proceed to the next step.
*/
addr[1] = 0;

printf("overwrite return address:\n");
/* TODO 2: Add code that overwrites the return address with the address of pawned. */
addr[7] = &pawned;
addr[3] = &pawned;

(void) p;
}
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