Lab 3 - IDA

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A non-terminated string • In this program, the beginning of the string is valid • Just checking the pointer is not enough #define PGS 4096 /* page size */ #define PMASK 0xfffff000 static char inbss; int main (int argc, char ** argv) { char * bss_page = (char*) ((uint)(&inbss) & PMASK); memset (bss_page, 'a', PGS ); create (bss_page+PGS5, 1024); } exit(0); 30
<strong>Lab</strong> 3 : Pointer paranoia Memory validation (simple method) Kernel VM Physical Memory PHYS_BASE 0 Kernel User Page directory • A valid pointer into a syscall: – is below PHYS_BASE in VM – is associated with a page of physical memory: use pagedir_get_page() • Kill the user program if there is an error! – exit code -1 31
Page 1 and 2: TDDB68 2011 Lesson 2 Pintos Assignm
Page 3 and 4: Instead of Motivation • Some of y
Page 5 and 6: Lab 3: overview • Part A - Multip
Page 7 and 8: Exec & wait example: src/examples/s
Page 9 and 10: Part A Lab 3: Exec • pid_t exec (
Page 11 and 12: Lab 3: Exec Starting the child Pare
Page 13 and 14: Lab 3: Situations with Wait • Chi
Page 15 and 16: Lab 3: Situations with Wait • Chi
Page 17 and 18: Reference counting “poor man's ga
Page 19 and 20: Lab 3: Part B • Sometimes we want
Page 21 and 22: Lab 3: Part B • Every time you do
Page 23 and 24: Lab 3 (B): Program arguments • ST
Page 25 and 26: Address Name Data Type 0xbffffffd a
Page 27 and 28: Lab 3 : Part C • Part C: Making t
Page 29: Bad string argument • User progra
Page 33 and 34: Lab 4: General Description • Lab
Page 35 and 36: Lab 4: Files (2) • devices/disk.[
Page 37 and 38: Lab 4: Additional System Calls •
Page 39 and 40: Lab 4: Final Tests • For testing

Lab 3 - IDA

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