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/* SPDX-License-Identifier: MIT */
/*
* 6.10-rc merge window had a bug where the rewritten mmap support caused
* rings allocated with > 1 page, but asking for smaller mappings, would
* cause -EFAULT to be returned rather than a successful map. This hit
* applications either using an ancient liburing with IORING_FEAT_SINGLE_MMAP
* support, or application just ignoring that feature flag and still doing
* 3 mmap operations to map the ring.
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "../src/syscall.h"
#include "liburing.h"
#include "helpers.h"
#define ENTRIES 128
int main(int argc, char *argv[])
{
struct io_uring_params p = { };
void *ptr;
int fd;
if (argc > 1)
return T_EXIT_SKIP;
fd = __sys_io_uring_setup(ENTRIES, &p);
if (fd < 0)
return T_EXIT_SKIP;
if (!(p.features & IORING_FEAT_SINGLE_MMAP)) {
close(fd);
return T_EXIT_SKIP;
}
ptr = __sys_mmap(0, ENTRIES * sizeof(unsigned), PROT_READ | PROT_WRITE,
MAP_SHARED | MAP_POPULATE, fd,
IORING_OFF_SQ_RING);
if (!IS_ERR(ptr)) {
close(fd);
return T_EXIT_PASS;
}
fprintf(stderr, "ring sqe array mmap: %d\n", PTR_ERR(ptr));
return T_EXIT_FAIL;
}
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