forked from Minki/linux
mainlining shenanigans
99dc4a5dfe
Jason A. Donenfeld says: ==================== wireguard fixes for 5.9-rc5 Yesterday, Eric reported a race condition found by syzbot. This series contains two commits, one that fixes the direct issue, and another that addresses the more general issue, as a defense in depth. 1) The basic problem syzbot unearthed was that one particular mutation of handshake->entry was not protected by the handshake mutex like the other cases, so this patch basically just reorders a line to make sure the mutex is actually taken at the right point. Most of the work here went into making sure the race was fully understood and making a reproducer (which syzbot was unable to do itself, due to the rarity of the race). 2) Eric's initial suggestion for fixing this was taking a spinlock around the hash table replace function where the null ptr deref was happening. This doesn't address the main problem in the most precise possible way like (1) does, but it is a good suggestion for defense-in-depth, in case related issues come up in the future, and basically costs nothing from a performance perspective. I thought it aided in implementing a good general rule: all mutators of that hash table take the table lock. So that's part of this series as a companion. Both of these contain Fixes: tags and are good candidates for stable. ==================== Signed-off-by: David S. Miller <davem@davemloft.net> |
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| README | ||
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.