oss-security - CVE Request: Squashfs 4.2 Race Condition

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Message-Id: <EECDD1E6-9C66-47B4-AB55-D64951749EEB@member.fsf.org>
Date: Thu, 31 Dec 2015 02:09:43 +0900
From: Jihyeok Seo <limeburst@...ber.fsf.org>
To: oss-security@...ts.openwall.com
Subject: CVE Request: Squashfs 4.2 Race Condition

A malformed Squashfs filesystem can cause a race condition in unsquashfs. Versions below 4.3 are affected.

This is caused by the decompress thread attempting to access a shared queue, resulting in a SIGSEGV.

    struct cache_entry *entry = queue_get(to_deflate);

I have attached a sample filesystem image illustrating this case.

Download attachment "attachment" of type "application/octet-stream" (3042 bytes)

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