Date: Mon, 23 Feb 2015 11:11:26 +0100 From: Petr Matousek <pmatouse@...hat.com> To: oss-security@...ts.openwall.com Subject: CVE-2015-0275 -- Linux kernel: fs: ext4: fallocate zero range page size > block size BUG() Currently there is a bug in zero range code which causes zero range calls to only allocate block aligned portion of the range, while ignoring the rest in some cases. In some cases, namely if the end of the range is past isize, we do attempt to preallocate the last nonaligned block. However this might cause kernel to BUG() in some carefully designed zero range requests on setups where page size > block size. Proposed upstream patch: http://www.spinics.net/lists/linux-ext4/msg47193.html References: https://bugzilla.redhat.com/show_bug.cgi?id=1193907 Thanks, -- Petr Matousek / Red Hat Product Security PGP: 0xC44977CA 8107 AF16 A416 F9AF 18F3 D874 3E78 6F42 C449 77CA
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