Re: Permission denied when chainbuilding packages with mock

[Julian Sikorski <belegdol@gmail.com>]

Am 09.11.21 um 09:10 schrieb Steve French:
> Yes - here is a trivial reproducer (excuse the ugly sample cut-n-paste)
> 
> #include <stdio.h>
> #include <stdlib.h>
> #include <unistd.h>
> #include <string.h>
> #include <fcntl.h>
> #include <sys/types.h>
> #include <sys/stat.h>
> 
> int main(int argc, char *argv[]) {
> char *str = "Text to be added";
> int fd, ret, fsyncrc, fsyncr_rc, openrc, closerc, close2rc;
> 
> fd = creat("test.txt", S_IWUSR | S_IRUSR);
> if (fd < 0) {
> perror("creat()");
> exit(1);
> }
> ret = write(fd, str, strlen(str));
> if (ret < 0) {
> perror("write()");
> exit(1);
> }
> openrc = open("test.txt", O_RDONLY);
>          if (openrc < 0) {
>                  perror("creat()");
>                  exit(1);
>          }
> fsyncr_rc = fsync(openrc);
> if (fsyncr_rc < 0)
> perror("fsync()");
> fsyncrc = fsync(fd);
> closerc = close(fd);
> close2rc = close(openrc);
> printf("read fsync rc=%d, write fsync rc=%d, close rc=%d, RO close
> rc=%d\n", fsyncr_rc, fsyncrc, closerc, close2rc);
> }
> 

I can confirm this fails on my machine without nostrictsync:

$ ./test

fsync(): Permission denied

read fsync rc=-1, write fsync rc=0, close rc=0, RO close rc=0

and works with nostrictsync:

$ ./test

read fsync rc=0, write fsync rc=0, close rc=0, RO close rc=0

So is the bug in the Linux kernel?

Best regards,
Julian