https://bugs.kde.org/show_bug.cgi?id=525637
Bug ID: 525637
Summary: ioctl(UFFDIO_API) complains about uninitialized out
parameter
Classification: Developer tools
Product: valgrind
Version First 3.27 GIT
Reported In:
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: memcheck
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
#include <stdio.h>
#include <unistd.h>
#include <linux/userfaultfd.h>
#include <linux/fs.h>
#include <sys/syscall.h>
#include <sys/ioctl.h>
#include <fcntl.h>
int main() {
struct uffdio_api uffdio_api;
int uffd_fd = syscall(__NR_userfaultfd, O_CLOEXEC | O_NONBLOCK |
UFFD_USER_MODE_ONLY);
if (uffd_fd == -1)
{
puts("fail.");
return 1;
}
uffdio_api.api = UFFD_API;
uffdio_api.features = UFFD_FEATURE_WP_ASYNC | UFFD_FEATURE_WP_UNPOPULATED;
if (ioctl(uffd_fd, UFFDIO_API, &uffdio_api) || uffdio_api.api != UFFD_API)
{
close(uffd_fd);
puts("fail.");
return 1;
}
puts("success.");
}
No particular flags needed, gcc's and valgrind's defaults are fine. Tested on
3.27.1 (not 3.27-git - the version field doesn't have a 3.27.1 option).
Expected: Print the usual Valgrind header/footer, and the success message.
Actual: Also prints a warning about uninitialized ioctl argument, the ioctls
field. https://www.man7.org/linux/man-pages/man2/UFFDIO_API.2const.html says
that field is out only, so the warning is unnecessary.
--
You are receiving this mail because:
You are watching all bug changes.
