1 #ifdef HAVE_CONFIG_H 2 # include "config.h" 3 #endif 4 5 #include <stdio.h> 6 #include <stdint.h> 7 #include <unistd.h> 8 #include <limits.h> 9 #include <sys/mman.h> 10 11 int 12 main(void) 13 { 14 const intmax_t pagesize = sysconf(_SC_PAGESIZE); 15 const unsigned long length = pagesize * 3; 16 const int fd = -1; 17 off_t offset; 18 void *addr, *p; 19 20 #if ULONG_MAX > 4294967295UL 21 offset = 0xcafedeadbeef000 & -pagesize; 22 addr = (void *) (uintmax_t) (0xfacefeed000 & -pagesize); 23 #else 24 offset = 0xdeadbeef000 & -pagesize; 25 addr = (void *) (unsigned int) (0xfaced000 & -pagesize); 26 #endif 27 28 p = mmap(addr, length, PROT_READ | PROT_WRITE, 29 MAP_PRIVATE | MAP_ANONYMOUS, fd, offset); 30 if (p == MAP_FAILED || 31 mprotect(p, length, PROT_NONE) || 32 munmap(p, length)) 33 return 77; 34 35 if (sizeof(offset) == sizeof(int)) 36 printf("(mmap2?|old_mmap)\\(%p, %lu, PROT_READ\\|PROT_WRITE, " 37 "MAP_PRIVATE\\|MAP_ANONYMOUS, %d, %#x\\) = %p\n", 38 addr, length, fd, (unsigned int) offset, p); 39 else 40 printf("(mmap2?|old_mmap)\\(%p, %lu, PROT_READ\\|PROT_WRITE, " 41 "MAP_PRIVATE\\|MAP_ANONYMOUS, %d, %#jx\\) = %p\n", 42 addr, length, fd, (uintmax_t) offset, p); 43 printf("mprotect\\(%p, %lu, PROT_NONE\\) += 0\n", p, length); 44 printf("munmap\\(%p, %lu\\) += 0\n", p, length); 45 return 0; 46 } 47
