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Bug#637528: marked as done (certain %fs values are not accepted in i386_set_fsbase())

Your message dated Tue, 16 Aug 2011 00:26:14 +0200 (CEST)
with message-id <alpine.LRH.2.02.1108160016150.9147@sci.felk.cvut.cz>
and subject line Re: certain %fs values are not accepted in i386_set_fsbase()
has caused the Debian Bug report #637528,
regarding certain %fs values are not accepted in i386_set_fsbase()
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

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-- 
637528: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=637528
Debian Bug Tracking System
Contact owner@bugs.debian.org with problems
--- Begin Message --- 
Package: kfreebsd-image-8.1-1-amd64
Version: 8.1+dfsg-9
Severity: normal

This test case shows how i386_set_fsbase() works fine when its argument is a
pointer to the BSS, but doesn't when its argument is a pointer to the heap:

$ gcc i386_set_fsbase_test.c -o test -m32 && ./test
0x80496cc, 0x80496cc
0x8049720, 0x0

(first line is for BSS, output matches with input; second line is for heap,
output is 0x0 and doesn't match)

I initially suspected this is a re-incarnation of upstram bug 130526:

  http://www.freebsd.org/cgi/query-pr.cgi?pr=130526

but response from upstream indicates they can't reproduce it anymore.  I've
been able to reproduce this with different combinations of kFreeBSD 8.1, 8.2
and 9.0~svn224698 with i386 and amd64, with GNU userland and with FreeBSD
userland.

Any help would be appreciated.

-- System Information:
Debian Release: 6.0.2
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable')
Architecture: kfreebsd-amd64 (x86_64)

Kernel: kFreeBSD 8.2-1-amd64
Locale: LANG=ca_AD.utf8, LC_CTYPE=ca_AD.utf8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages kfreebsd-image-8.1-1-amd64 depends on:
ii  freebsd-utils                 8.1-5      FreeBSD utilities needed for GNU/k
ii  kldutils                      8.1-4+b1   tools for managing kFreeBSD module

kfreebsd-image-8.1-1-amd64 recommends no packages.

kfreebsd-image-8.1-1-amd64 suggests no packages.

-- no debconf information

#include <stdio.h>
#include <machine/sysarch.h>
#include <stdlib.h>
#include <unistd.h>

#ifndef __i386__
#error "this test is for ia32 mode only"
#endif

void *p;
void *check = NULL;

main()
{
  p = &p;
  sysarch(I386_SET_FSBASE, p);
  sysarch(I386_GET_FSBASE, &check);
  printf ("0x%x, 0x%x\n", p, check);

  p = malloc (1);
  sysarch(I386_SET_FSBASE, p);
  sysarch(I386_GET_FSBASE, &check);
  printf ("0x%x, 0x%x\n", p, check);
}

--- End Message ---
--- Begin Message --- 
Hi,

the problem is not in the kernel, but in test program.
It's main() should be as bellow.

Petr

main()
{
  void *val[1];

  p = &p;
  val[0] = p;
  sysarch(I386_SET_FSBASE, val);
  sysarch(I386_GET_FSBASE, &check);
  printf ("0x%x, 0x%x\n", *val, check);

  p = malloc (1);
  val[0] = p;
  sysarch(I386_SET_FSBASE, val);
  sysarch(I386_GET_FSBASE, &check);
  printf ("0x%x, 0x%x\n", *val, check);

  val[0] = 0x12345678;
  sysarch(I386_SET_FSBASE, val);
  sysarch(I386_GET_FSBASE, &check);
  printf ("0x%x, 0x%x\n", *val, check);


  val[0] = 0xFEDCBA90;
  sysarch(I386_SET_FSBASE, val);
  sysarch(I386_GET_FSBASE, &check);
  printf ("0x%x, 0x%x\n", *val, check);

}

--- End Message ---
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