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authorTheodore Ts'o2016-11-18 13:24:26 -0500
committerTheodore Ts'o2016-11-18 13:24:26 -0500
commit5aee0f8a3f42c94c5012f1673420aee96315925a (patch)
treef483dee5f756f7a60cb3e2dc62a6bec7a37933f6 /virt
parent9e47a4c9fc58032ee135bf76516809c7624b1551 (diff)
ext4: fix in-superblock mount options processing
Fix a large number of problems with how we handle mount options in the superblock. For one, if the string in the superblock is long enough that it is not null terminated, we could run off the end of the string and try to interpret superblocks fields as characters. It's unlikely this will cause a security problem, but it could result in an invalid parse. Also, parse_options is destructive to the string, so in some cases if there is a comma-separated string, it would be modified in the superblock. (Fortunately it only happens on file systems with a 1k block size.) Signed-off-by: Theodore Ts'o <tytso@mit.edu> Cc: stable@vger.kernel.org
Diffstat (limited to 'virt')
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