path: root/arch
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authorValerie Aurora <vaurora@redhat.com>2010-08-26 11:07:22 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2010-09-07 13:46:20 -0700
commit7a2e8a8faab76386d8eaae9ded739ee5615be174 (patch)
tree404b9c185f32e3e6ef871bb85c217314e4aff3e8 /arch
parent2bfc96a127bc1cc94d26bfaa40159966064f9c8c (diff)
VFS: Sanity check mount flags passed to change_mnt_propagation()
Sanity check the flags passed to change_mnt_propagation(). Exactly one flag should be set. Return EINVAL otherwise. Userspace can pass in arbitrary combinations of MS_* flags to mount(). do_change_type() is called if any of MS_SHARED, MS_PRIVATE, MS_SLAVE, or MS_UNBINDABLE is set. do_change_type() clears MS_REC and then calls change_mnt_propagation() with the rest of the user-supplied flags. change_mnt_propagation() clearly assumes only one flag is set but do_change_type() does not check that this is true. For example, mount() with flags MS_SHARED | MS_RDONLY does not actually make the mount shared or read-only but does clear MNT_UNBINDABLE. Signed-off-by: Valerie Aurora <vaurora@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch')
0 files changed, 0 insertions, 0 deletions

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