linux-toradex.git/fs/compat.c, branch v2.6.27.24

fs core fixes

2009-05-02T17:25:00+00:00

Please add the following 4 commits to 2.6.27-stable and 2.6.28-stable.
However, there has been a lot of change here between 2.6.28 and 2.6.29:
in particular, fs/exec.c's unsafe_exec() grew into the more complicated
check_unsafe_exec().  So applying the original patches gives too many
rejects: at the bottom is the diffstat and the combined patch required.

1
Commit: 53e9309e01277ec99c38e84e0ca16921287cf470
Author: Hugh Dickins 
Date: Sat, 28 Mar 2009 23:16:03 +0000 (+0000)
Subject: compat_do_execve should unshare_files

2
Commit: e426b64c412aaa3e9eb3e4b261dc5be0d5a83e78
Author: Hugh Dickins 
Date: Sat, 28 Mar 2009 23:20:19 +0000 (+0000)
Subject: fix setuid sometimes doesn't

3
Commit: 7c2c7d993044cddc5010f6f429b100c63bc7dffb
Author: Hugh Dickins 
Date: Sat, 28 Mar 2009 23:21:27 +0000 (+0000)
Subject: fix setuid sometimes wouldn't

4
Commit: f1191b50ec11c8e2ca766d6d99eb5bb9d2c084a3
Author: Al Viro 
Date: Mon, 30 Mar 2009 11:35:18 +0000 (-0400)
Subject: check_unsafe_exec() doesn't care about signal handlers sharing

Signed-off-by: Hugh Dickins 
Signed-off-by: Greg Kroah-Hartman

Make sys_pselect7 static

2009-01-18T18:35:33+00:00

commit c9da9f2129d6a421c32e334a83770a9e67f7feac upstream.

Not a single architecture has wired up sys_pselect7 plus it is the
only system call with seven parameters. Just make it static and
rename it to do_pselect which will do the work for sys_pselect6.

Signed-off-by: Heiko Carstens 
Signed-off-by: Greg Kroah-Hartman

[PATCH] fix regular readdir() and friends

2008-08-25T05:18:08+00:00

Handling of -EOVERFLOW.

Signed-off-by: Al Viro

[PATCH] sanitize __user_walk_fd() et.al.

2008-07-27T00:53:34+00:00

* do not pass nameidata; struct path is all the callers want.
* switch to new helpers:
	user_path_at(dfd, pathname, flags, &path)
	user_path(pathname, &path)
	user_lpath(pathname, &path)
	user_path_dir(pathname, &path)  (fail if not a directory)
  The last 3 are trivial macro wrappers for the first one.
* remove nameidata in callers.

Signed-off-by: Al Viro

flag parameters: signalfd

2008-07-24T17:47:27+00:00

This patch adds the new signalfd4 syscall.  It extends the old signalfd
syscall by one parameter which is meant to hold a flag value.  In this
patch the only flag support is SFD_CLOEXEC which causes the close-on-exec
flag for the returned file descriptor to be set.

A new name SFD_CLOEXEC is introduced which in this implementation must
have the same value as O_CLOEXEC.

The following test must be adjusted for architectures other than x86 and
x86-64 and in case the syscall numbers changed.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
#include 
#include 
#include 
#include 
#include 

#ifndef __NR_signalfd4
# ifdef __x86_64__
#  define __NR_signalfd4 289
# elif defined __i386__
#  define __NR_signalfd4 327
# else
#  error "need __NR_signalfd4"
# endif
#endif

#define SFD_CLOEXEC O_CLOEXEC

int
main (void)
{
  sigset_t ss;
  sigemptyset (&ss);
  sigaddset (&ss, SIGUSR1);
  int fd = syscall (__NR_signalfd4, -1, &ss, 8, 0);
  if (fd == -1)
    {
      puts ("signalfd4(0) failed");
      return 1;
    }
  int coe = fcntl (fd, F_GETFD);
  if (coe == -1)
    {
      puts ("fcntl failed");
      return 1;
    }
  if (coe & FD_CLOEXEC)
    {
      puts ("signalfd4(0) set close-on-exec flag");
      return 1;
    }
  close (fd);

  fd = syscall (__NR_signalfd4, -1, &ss, 8, SFD_CLOEXEC);
  if (fd == -1)
    {
      puts ("signalfd4(SFD_CLOEXEC) failed");
      return 1;
    }
  coe = fcntl (fd, F_GETFD);
  if (coe == -1)
    {
      puts ("fcntl failed");
      return 1;
    }
  if ((coe & FD_CLOEXEC) == 0)
    {
      puts ("signalfd4(SFD_CLOEXEC) does not set close-on-exec flag");
      return 1;
    }
  close (fd);

  puts ("OK");

  return 0;
}
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

[akpm@linux-foundation.org: add sys_ni stub]
Signed-off-by: Ulrich Drepper 
Acked-by: Davide Libenzi 
Cc: Michael Kerrisk 
Cc: 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

fs: check for statfs overflow

2008-07-24T17:47:19+00:00

Adds a check for an overflow in the filesystem size so if someone is
checking with statfs() on a 16G blocksize hugetlbfs in a 32bit binary that
it will report back EOVERFLOW instead of a size of 0.

Acked-by: Nishanth Aravamudan 
Signed-off-by: Jon Tollefson 
Signed-off-by: Nick Piggin 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] get rid of leak in compat_execve()

2008-05-16T21:23:05+00:00

Even though copy_compat_strings() doesn't cache the pages,
copy_strings_kernel() and stuff indirectly called by e.g.
->load_binary() is doing that, so we need to drop the
cache contents in the end.

[found by WANG Cong ]

Signed-off-by: Al Viro

[PATCH] split linux/file.h

2008-05-01T17:08:16+00:00

Initial splitoff of the low-level stuff; taken to fdtable.h

Signed-off-by: Al Viro

signals: use HAVE_SET_RESTORE_SIGMASK

2008-04-30T15:29:37+00:00

Change all the #ifdef TIF_RESTORE_SIGMASK conditionals in non-arch code to
#ifdef HAVE_SET_RESTORE_SIGMASK.  If arch code defines it first, the generic
set_restore_sigmask() using TIF_RESTORE_SIGMASK is not defined.

Signed-off-by: Roland McGrath 
Cc: Oleg Nesterov 
Cc: Ingo Molnar 
Cc: Thomas Gleixner 
Cc: Martin Schwidefsky 
Cc: Heiko Carstens 
Cc: "Luck, Tony" 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

signals: add set_restore_sigmask

2008-04-30T15:29:37+00:00

This adds the set_restore_sigmask() inline in  and
replaces every set_thread_flag(TIF_RESTORE_SIGMASK) with a call to it.  No
change, but abstracts the details of the flag protocol from all the calls.

Signed-off-by: Roland McGrath 
Cc: Oleg Nesterov 
Cc: Ingo Molnar 
Cc: Thomas Gleixner 
Cc: Martin Schwidefsky 
Cc: Heiko Carstens 
Cc: "Luck, Tony" 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds