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Date: Fri, 19 Jul 2019 07:03:43 -0700
From: Tavis Ormandy <>
Subject: stack buffer overflow in fbdev

Hello, during a conversation on twitter we noticed a stack buffer
overflow in fbdev with malicious edid data:

There is enough space to have 52 1-byte length values, which makes svd_n
52, then make the final value length 0x1f (the maximum), which makes
svd_n 83 and overflows the 64 byte stack buffer svd[] with controlled

This requires a malicious monitor / projector / etc, so pretty low impact.

I pulled out the code to make a demo (I removed the checksum, but it
doesnt prevent the bug):

This was discovered by Nico Waisman of Semmle.


------------------------------------- | finger me for my pgp key.

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