ext4: add ext4_iget_normal() which is to be used for dir tree lookups

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commit f4bb298102 upstream.

If there is a corrupted file system which has directory entries that
point at reserved, metadata inodes, prohibit them from being used by
treating them the same way we treat Boot Loader inodes --- that is,
mark them to be bad inodes.  This prohibits them from being opened,
deleted, or modified via chmod, chown, utimes, etc.

In particular, this prevents a corrupted file system which has a
directory entry which points at the journal inode from being deleted
and its blocks released, after which point Much Hilarity Ensues.

Reported-by: Sami Liedes <sami.liedes@iki.fi>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>

...

This commit is contained in:

Theodore Ts'o 2014-10-05 22:56:00 -04:00 • committed by Luis Henriques

parent e1956e85e5

commit ba55c5e8a3

4 changed files with 11 additions and 3 deletions

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1

fs/ext4/ext4.h

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7

fs/ext4/inode.c

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4

fs/ext4/namei.c

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2

fs/ext4/super.c

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