[Bug libc/11611] statvfs sign-extends lower 32 bits of f_fsid field, loses upper 32 bits

[Bug libc/11611] statvfs sign-extends lower 32 bits of f_fsid field, loses upper 32 bits

[fweimer at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=11611

Florian Weimer <fweimer at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
              Flags|                            |security-

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[Bug libc/11611] statvfs sign-extends lower 32 bits of f_fsid field, loses upper 32 bits

[drepper dot fsp at gmail dot com]

------- Additional Comments From drepper dot fsp at gmail dot com  2010-09-28 02:37 -------
Fixed in git.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED


http://sourceware.org/bugzilla/show_bug.cgi?id=11611

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[Bug libc/11611] statvfs sign-extends lower 32 bits of f_fsid field, loses upper 32 bits

[rang at me dot com]

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
  GCC build triplet|                            |x86_64-unknown-linux-gnu
                   |                            |(CentOS 5.4)
   GCC host triplet|x86_64, Linux (CentOS 5.4)  |x86_64-unknown-linux-gnu
                   |                            |(CentOS 5.4)
 GCC target triplet|                            |x86_64-unknown-linux-gnu
                   |                            |(CentOS 5.4)


http://sourceware.org/bugzilla/show_bug.cgi?id=11611

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[Bug libc/11611] statvfs sign-extends lower 32 bits of f_fsid field, loses upper 32 bits

[rang at me dot com]

------- Additional Comments From rang at me dot com  2010-05-19 18:04 -------
For better correctness, the test program should probably do something like

  unsigned long id;
  memcpy(&id, &suck.f_fsid, sizeof(id));
  printf("%016lx\n", id);

rather than just passing the structure to printf and expecting the right thing to happen, but either shows 
the correct FSID on x86_64.


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http://sourceware.org/bugzilla/show_bug.cgi?id=11611

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[Bug libc/11611] statvfs sign-extends lower 32 bits of f_fsid field, loses upper 32 bits

[rang at me dot com]

------- Additional Comments From rang at me dot com  2010-05-19 17:47 -------
A really simple test program, if you happen to have a file system around that delivers these FSIDs....

#include <stdio.h>
#include <sys/statfs.h>
#include <sys/statvfs.h>
#include <fcntl.h>

void main(int argc, char *argv[])
{
  int fd;
  struct statvfs v;
  struct statfs suck;

  if (argc != 2) { printf("need mountpoint\n"); return; }

  fd = open(argv[1], O_RDONLY);
  if (fd < 0) perror("open");

  if (fstatvfs(fd, &v) < 0) perror("fstatvfs");

  printf("%016lx\n", v.f_fsid);

  if (fstatfs(fd, &suck) < 0) perror("fstatfs");

  printf("%016lx\n", suck.f_fsid);
}


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