2 * Check decoding of "old mmap" edition of mmap syscall.
4 * Copyright (c) 2016 Dmitry V. Levin <ldv@altlinux.org>
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31 #include <asm/unistd.h>
34 * On s390x and m68k, this is the mmap syscall used by glibc, so,
35 * from one side, it's already covered by another test, and, from another side,
36 * it would require additional efforts to filter out mmap calls made by glibc.
39 #if defined __NR_mmap && \
42 || (defined __s390__ && !defined __s390x__) \
47 # include <sys/mman.h>
53 long rc = syscall(__NR_mmap, 0);
54 printf("mmap(NULL) = %ld %s (%m)\n", rc, errno2name());
56 const unsigned int args1_c[6] = {
57 0xdeadbeef, /* addr */
59 PROT_READ|PROT_EXEC, /* prot */
60 MAP_FILE|MAP_FIXED, /* flags */
62 0xbadc0ded /* offset */
64 const unsigned int page_size = get_page_size();
65 const unsigned int args2_c[6] = {
69 MAP_PRIVATE|MAP_ANONYMOUS,
71 0xfaced000 & -page_size
73 void *args = tail_memdup(args1_c, sizeof(args1_c));
75 rc = syscall(__NR_mmap, args);
76 printf("mmap(%#x, %u, PROT_READ|PROT_EXEC, MAP_FILE|MAP_FIXED"
77 ", %d, %#x) = %ld %s (%m)\n",
78 args1_c[0], args1_c[1], args1_c[4], args1_c[5],
81 memcpy(args, args2_c, sizeof(args2_c));
82 rc = syscall(__NR_mmap, args);
83 printf("mmap(NULL, %u, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS"
84 ", %d, %#x) = %#lx\n",
85 args2_c[1], args2_c[4], args2_c[5], rc);
87 void *addr = (void *) rc;
88 if (mprotect(addr, page_size, PROT_NONE))
89 perror_msg_and_fail("mprotect(%p, %u, PROT_NONE)",
92 puts("+++ exited with 0 +++");
98 SKIP_MAIN_UNDEFINED("__NR_mmap && (__arm__ || __i386__"
99 " || (__s390__ && !__s390x__))")