Vulnerability CVE-2024-26606
Published: 2024-02-26

Description:
In the Linux kernel, the following vulnerability has been resolved:

binder: signal epoll threads of self-work

In (e)poll mode, threads often depend on I/O events to determine when
data is ready for consumption. Within binder, a thread may initiate a
command via BINDER_WRITE_READ without a read buffer and then make use
of epoll_wait() or similar to consume any responses afterwards.

It is then crucial that epoll threads are signaled via wakeup when they
queue their own work. Otherwise, they risk waiting indefinitely for an
event leaving their work unhandled. What is worse, subsequent commands
won't trigger a wakeup either as the thread has pending work.

 References:
https://git.kernel.org/stable/c/dd64bb8329ce0ea27bc557e4160c2688835402ac
https://git.kernel.org/stable/c/42beab162dcee1e691ee4934292d51581c29df61
https://git.kernel.org/stable/c/a423042052ec2bdbf1e552e621e6a768922363cc
https://git.kernel.org/stable/c/82722b453dc2f967b172603e389ee7dc1b3137cc
https://git.kernel.org/stable/c/90e09c016d72b91e76de25f71c7b93d94cc3c769
https://git.kernel.org/stable/c/a7ae586f6f6024f490b8546c8c84670f96bb9b68
https://git.kernel.org/stable/c/93b372c39c40cbf179e56621e6bc48240943af69
https://git.kernel.org/stable/c/97830f3c3088638ff90b20dfba2eb4d487bf14d7
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