1 /* SPDX-License-Identifier: MIT */
2 /*
3 * 6.10-rc merge window had a bug where the rewritten mmap support caused
4 * rings allocated with > 1 page, but asking for smaller mappings, would
5 * cause -EFAULT to be returned rather than a successful map. This hit
6 * applications either using an ancient liburing with IORING_FEAT_SINGLE_MMAP
7 * support, or application just ignoring that feature flag and still doing
8 * 3 mmap operations to map the ring.
9 */
10 #include <stdio.h>
11 #include <stdlib.h>
12 #include <unistd.h>
13
14 #include "../src/syscall.h"
15 #include "liburing.h"
16 #include "helpers.h"
17
18 #define ENTRIES 128
19
main(int argc,char * argv[])20 int main(int argc, char *argv[])
21 {
22 struct io_uring_params p = { };
23 void *ptr;
24 int fd;
25
26 if (argc > 1)
27 return T_EXIT_SKIP;
28
29 fd = __sys_io_uring_setup(ENTRIES, &p);
30 if (fd < 0)
31 return T_EXIT_SKIP;
32
33 if (!(p.features & IORING_FEAT_SINGLE_MMAP)) {
34 close(fd);
35 return T_EXIT_SKIP;
36 }
37
38 ptr = __sys_mmap(0, ENTRIES * sizeof(unsigned), PROT_READ | PROT_WRITE,
39 MAP_SHARED | MAP_POPULATE, fd,
40 IORING_OFF_SQ_RING);
41 if (!IS_ERR(ptr)) {
42 close(fd);
43 return T_EXIT_PASS;
44 }
45
46 fprintf(stderr, "ring sqe array mmap: %d\n", PTR_ERR(ptr));
47 return T_EXIT_FAIL;
48 }
49