ext4: check EA value offset when loading

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When loading extended attributes, check each entry's value offset to
make sure it doesn't collide with the entries.

Without this check it is easy to crash the kernel by mounting a
malicious FS containing a file with an EA wherein e_value_offs = 0 and
e_value_size > 0 and then deleting the EA, which corrupts the name
list.

(See the f_ea_value_crash test's FS image in e2fsprogs for an example.)

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@vger.kernel.org

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Darrick J. Wong 2014-09-16 14:34:59 -04:00 • committed by Theodore Ts'o

parent 684de57486

commit a0626e7595

1 changed files with 24 additions and 8 deletions

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fs/ext4/xattr.c

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