ext4: don't fail GETFSUUID when the caller provides a long buffer

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commit a7e9d977e0 upstream.

If userspace provides a longer UUID buffer than is required, we
shouldn't fail the call with EINVAL -- rather, we can fill the caller's
buffer with the bytes we /can/ fill, and update the length field to
reflect what we copied.  This doesn't break the UAPI since we're
enabling a case that currently fails, and so far Ted hasn't released a
version of e2fsprogs that uses the new ext4 ioctl.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Catherine Hoang <catherine.hoang@oracle.com>
Link: https://lore.kernel.org/r/166811139478.327006.13879198441587445544.stgit@magnolia
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Darrick J. Wong 2022-11-10 12:16:34 -08:00 • committed by Greg Kroah-Hartman

parent 13271fbbe8

commit b753b0be45

1 changed files with 4 additions and 2 deletions

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fs/ext4/ioctl.c

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