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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace

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Pull userns fix from Eric Biederman:
 "This contains just a single small patch that fixes a tiny hole in the
  logic of allowing unprivileged mounting of proc and sysfs.

  In practice I don't think anyone is affected because having MNT_RDONLY
  clear in mnt->mnt_flags but MS_RDONLY set in sb->s_flags is very weird
  for a filesystem, and weirder for proc and sysfs.  However if it
  happens let's handle it correctly and then no one has to to worry
  about this crazy case"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace:
  mnt: Account for MS_RDONLY in fs_fully_visible
This commit is contained in:
Linus Torvalds 2016-06-22 14:11:24 -07:00
commit f9020d1741
1 changed files with 4 additions and 0 deletions
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4
fs/namespace.c
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@ -3247,6 +3247,10 @@ static bool fs_fully_visible(struct file_system_type *type, int *new_mnt_flags)
if (mnt->mnt.mnt_sb->s_iflags & SB_I_NOEXEC) if (mnt->mnt.mnt_sb->s_iflags & SB_I_NOEXEC)
mnt_flags &= ~(MNT_LOCK_NOSUID | MNT_LOCK_NOEXEC); mnt_flags &= ~(MNT_LOCK_NOSUID | MNT_LOCK_NOEXEC);
/* Don't miss readonly hidden in the superblock flags */
if (mnt->mnt.mnt_sb->s_flags & MS_RDONLY)
mnt_flags |= MNT_LOCK_READONLY;
/* Verify the mount flags are equal to or more permissive /* Verify the mount flags are equal to or more permissive
* than the proposed new mount. * than the proposed new mount.
*/ */