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[PATCH] disable unshare(CLONE_VM) for now

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sys_unshare() does mmput(new_mm).  This is not enough if we have
mm->core_waiters.

This patch is a temporary fix for soon to be released 2.6.16.

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
[ Checked with Uli: "I'm not planning to use unshare(CLONE_VM).  It's
  not needed for any functionality planned so far.  What we (as in Red
  Hat) need unshare() for now is the filesystem side." ]
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Oleg Nesterov 2006-03-18 20:41:10 +03:00 committed by Linus Torvalds
parent 265a92856b
commit 2d61b86775
1 changed files with 1 additions and 3 deletions
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4
kernel/fork.c
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@ -1478,9 +1478,7 @@ static int unshare_vm(unsigned long unshare_flags, struct mm_struct **new_mmp)
if ((unshare_flags & CLONE_VM) && if ((unshare_flags & CLONE_VM) &&
(mm && atomic_read(&mm->mm_users) > 1)) { (mm && atomic_read(&mm->mm_users) > 1)) {
*new_mmp = dup_mm(current); return -EINVAL;
if (!*new_mmp)
return -ENOMEM;
} }
return 0; return 0;