musl - Out-of-bounds reads in DNS response parsing

Message-ID: <cfeb02d2e770c48c5a1963f30b63644b@ispras.ru>
Date: Thu, 23 Feb 2023 23:34:01 +0300
From: Alexey Izbyshev <izbyshev@...ras.ru>
To: musl@...ts.openwall.com
Subject: Out-of-bounds reads in DNS response parsing

Hi,

I've found several issues with DNS response parsing that can result in 
getaddrinfo/getnameinfo reading unininitialized or (nearby) 
out-of-bounds data on stack and returning garbage. The issues are 
described in the attached patches.

Alexey
View attachment "0001-fix-out-of-bounds-reads-in-__dns_parse.patch" of type "text/x-diff" (2247 bytes)

View attachment "0002-prevent-CNAME-PTR-parsing-from-reading-data-past-the.patch" of type "text/x-diff" (3783 bytes)

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