Follow @Openwall on Twitter for new release announcements and other news
[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Date: Thu, 31 Mar 2016 17:11:29 +0200
From: Johannes Segitz <>
Subject: ext4 data corruption due to punch hole races


Jan Kara fixed some issues in the Linux kernel with security implications.

"When punching holes into a file races with the page fault of the same
area, it is possible that freed blocks remain referenced from page cache
pages mapped to process' address space. Thus modification of these blocks
can corrupt data someone else is now storing in those blocks (which
obviously has security implications if you can trick filesystem into
storing some important file in those blocks).

This affects all the kernels where we support ext4 for writing. Relevant
fixes upstream are commits ea3d7209ca01da209cda6f0dea8be9cc4b7a933b,

Please assign CVE(s).

GPG Key E7C81FA0       EE16 6BCE AD56 E034 BFB3  3ADD 7BF7 29D5 E7C8 1FA0
Subkey fingerprint:    250F 43F5 F7CE 6F1E 9C59  4F95 BC27 DD9D 2CC4 FD66
SUSE Linux GmbH, GF: Felix Imend├Ârffer, Jane Smithard, Graham Norton
HRB 21284 (AG N├╝rnberg)

Download attachment "signature.asc" of type "application/pgp-signature" (802 bytes)

Powered by blists - more mailing lists

Please check out the Open Source Software Security Wiki, which is counterpart to this mailing list.

Confused about mailing lists and their use? Read about mailing lists on Wikipedia and check out these guidelines on proper formatting of your messages.