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NetBSD replaced the macro with a sizeof(), which returns an unsigned result.
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In the initial PF code a particular macro was used as an alias to a number. The PF Signedness Bug: A bug was found in NetBSD’s implementation of the PF firewall, that did not affect the other BSDs. Returning IPPROTO_NONE was entirely wrong: it caused the kernel to keep iterating on the IPv6 packet chain, while the packet storage was already freed. The IPPROTO Typo: While looking at the IPv6 Multicast code, I stumbled across a pretty simple yet pretty bad mistake: at one point the Pim6 entry point would return IPPROTO_NONE instead of IPPROTO_DONE. In addition this flaw allowed a limited buffer overflow - where the data being written was however not controllable by the attacker. As a result, a specially-crafted IPv6 packet could trigger an infinite loop in the kernel (making it unresponsive). The IPsec Infinite Loop: When receiving an IPv6-AH packet, the IPsec entry point was not correctly computing the length of the IPv6 suboptions, and this, before authentication. This allowed at least a pretty bad remote DoS/Crash The IPv6 Buffer Overflow: The overflow allowed an attacker to write one byte of packet-controlled data into ‘packet_storage+off’, where ‘off’ could be approximately controlled too. A lot of code is shared between the BSDs, so it is especially helpful when one finds a bug, to check the other BSDs and share the fix.In the course of investigating several bugs discovered in NetBSD, I happened to look at the network stacks of other operating systems, to see whether they had already fixed the issues, and if so how. This was done in several layers of the NetBSD kernel, from device drivers to L4 handlers. Dozens of bugs were fixed, among which a good number of actual, remotely-triggerable vulnerabilities.Ĭhanges were made to strengthen the networking subsystems and improve code quality: reinforce the mbuf API, add many KASSERTs to enforce assumptions, simplify packet handling, and verify compliance with RFCs. Over the last five months, hundreds of patches were committed to the source tree as a result of this work. Maxime Villard has been working on an audit of the NetBSD network stack, a project sponsored by The NetBSD Foundation, which has served all users of BSD-derived operating systems.This brings NetBSD 10 years forward, and they should be able to catch the rest of the way up fairly quickly.dtrace FBT probes can now be placed in kernel modules.In addition to the 10 years of improvements from upstream, this version also has these NetBSD-specific enhancements: r315983 is from March 2017 (14 months ago), so there is still more work to do.This changes the upstream vendor from OpenSolaris to FreeBSD, and this version is based on FreeBSD svn r315983. Merge a new version of the CDDL dtrace and ZFS code.
#Mbox 3 drivers mac windows#
OpenZFS and DTrace updates in NetBSD, NetBSD network security stack audit, Performance of MySQL on ZFS, OpenSMTP results from p2k18, legacy Windows backup to FreeNAS, ZFS block size importance, and NetBSD as router on a stick.