1 // RUN: %clangxx %s -o %t && %run %t %p
2
3 #include <assert.h>
4 #include <errno.h>
5 #include <stdint.h>
6 #include <sys/mman.h>
7 #include <sys/prctl.h>
8
9 #ifndef PR_SCHED_CORE
10 # define PR_SCHED_CORE 62
11 #endif
12
13 #ifndef PR_SCHED_CORE_CREATE
14 # define PR_SCHED_CORE_CREATE 1
15 #endif
16
17 #ifndef PR_SCHED_CORE_GET
18 # define PR_SCHED_CORE_GET 0
19 #endif
20
21 #ifndef PR_SET_VMA
22 # define PR_SET_VMA 0x53564d41
23 # define PR_SET_VMA_ANON_NAME 0
24 #endif
25
main()26 int main() {
27
28 int res;
29 res = prctl(PR_SCHED_CORE, PR_SCHED_CORE_CREATE, 0, 0, 0);
30 if (res < 0) {
31 assert(errno == EINVAL || errno == ENODEV);
32 return 0;
33 }
34
35 uint64_t cookie = 0;
36 res = prctl(PR_SCHED_CORE, PR_SCHED_CORE_GET, 0, 0, &cookie);
37 if (res < 0) {
38 assert(errno == EINVAL);
39 } else {
40 assert(cookie != 0);
41 }
42
43 char invname[81], vlname[] = "prctl";
44 for (auto i = 0; i < sizeof(invname); i++) {
45 invname[i] = 0x1e;
46 }
47 invname[80] = 0;
48 auto p =
49 mmap(nullptr, 128, PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE, -1, 0);
50 assert(p != MAP_FAILED);
51 // regardless of kernel support, the name is invalid
52 res = prctl(PR_SET_VMA, PR_SET_VMA_ANON_NAME, (uintptr_t)p, 128,
53 (uintptr_t)invname);
54 assert(res == -1);
55 assert(errno == EINVAL);
56 res = prctl(PR_SET_VMA, PR_SET_VMA_ANON_NAME, (uintptr_t)p, 128,
57 (uintptr_t)vlname);
58 if (res < 0) {
59 assert(errno == EINVAL);
60 }
61 munmap(p, 128);
62
63 return 0;
64 }
65