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CMU CS 15213 - Recitation

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213 Recitation Exam 2 review Elie Krevat and Jiri SimsaExam coverage  Lectures 8-17, Buf lab, Shell lab:  Buffer overflow  Main Memory and Caches  Exceptions & Logical control flow  Sys-level I/O  Virtual Memory  Malloc  Disk StorageWhat’s NOT covered  Linking  Garbage Collection (not in depth)  VM access permissions (not in depth)  2-level Page TablesBuffer overflow  Understand layout of a stack frame  Be able to read assembly code  Frame ptr, stack ptr, instruction ptr  Given: unsafe code in C and assembly  Output: exploit string that calls a functionBuffer overflow push %rbp!mov %rsp,%rbp!sub $0x10,%rsp!lea 0xfffffffffffffff0(%rbp),%rdi!mov $0x0,%eax!! callq 4003a8 <gets@plt>!mov $0x0,%eax!leaveq !retq !Caches  Understand operation of caches  Bits for tag, set index, block offset  Direct-mapped, fully associative, or N-way set associative  Coding for locality & replacement policies  Given: Cache description and sequence of memory accesses  Output: Identify hits and missesCaches char sum_matrix(char matrix[3][3]) { "" int row, col; "" char sum = 0; "" for (col = 0; col < 3; col++) { """ for (row = 0; row < 3; row++) { "" " " sum += matrix[row][col]; """ } "" } "! return sum; "}! chars are 8 bits  cache is direct-mapped with 4 sets of 4 bytesControl flow & signals  Know fork(), wait(), kill(), signal(), ...  Given: C source code with printf()  Output: All possible outputsControl flow & signals void handler(int sig) {!! printf(“Whoops.\n”);!! exit(0);!}!int main() {!! int pid;!! signal(SIGUSR1,handler);!! if (pid = fork()) {!! ! printf(“Hi!\n”);!! ! kill(pid,SIGUSR1);!! } !! printf(“Peace\n”);!}"Sys-level I/O  File descriptors!  I/O redirection  Descriptor table per-process  Open file/vnode table all processes  Know open(), dup2(), fork(), ...  Given: C sources with printf()  Output: Correct outputFile descriptors int main() {!! int fd1, fd2;!! char c;!! int fd1 = open(“test.txt”,RD_ONLY);!! fd2 = dup(fd1);!! read(fd2,&c,1);!! printf(“1 = %c.\n”,c);!! fork();!! read(fd1,&c,1);! !! printf(“2 = %c.\n”,c);!}" test.txt contains “15213 rocks!”!Virtual memory  How memory request is handled  Translation look-aside buffer  Virtual vs. physical address  Page table  Page hit vs. Page miss  Given: VM description and requests  Output: Sequence of eventsVirtual memory  See exam 2, fall ‘06, problem 4Malloc()  Know malloc()  Implicit/explicit list (free blocks)  Types of errors, e.g.:  mem leaks  wrong allocation amounts  Initialization  Input: C code  Output: Identify errorMalloc() int **p; !p = malloc(N*sizeof(int)); !for (i=0; i<N; i++) { !! p[i] = malloc(M*sizeof(int));!}!Disk Storage  Know physical construction of disk  Disk heads, platters, etc.  How data is read  Speed and performance characteristicsQuestions?  Good


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CMU CS 15213 - Recitation

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