Oss-sec: Linux kernel futex local privilege escalation (CVE-2014-3153)

http://seclists.org/oss-sec/2014/q2/467

by zekers • 12 years ago

71 6 12 years ago

seclists.org

scott_s• 12 years ago

A follow-up comment describes how it works: http://seclists.org/oss-sec/2014/q2/469

haberman• 12 years ago

Nice. I didn't quite understand though:

Specifically, the futex syscall can leave a queued kernel waiter hanging on the stack. By manipulating the stack with further syscalls, the waiter structure can be altered.

Is the bug that the waiter is left on the stack, or that other syscalls can alter the stack?

Allowing syscalls to alter the stack seems like a vulnerability regardless of what happens to be on the stack when it's altered.

angersock• 12 years ago

See, this is what happens when (presumably white, male) programmers don't check their privilege.

figglesonrails• 12 years ago

That made my day brighter. Sorry you're getting so many downvotes for that. :(

voltagex_• 12 years ago

Isn't BPF a virtual machine inside the kernel? Does this have any impact on the likelihood of exploits?

dalias• 12 years ago

Is there any proper information on this issue? The patches do not apply cleanly against the latest stable kernel (3.14.5) and there's no indication I can find as to what version they're intended to be applied to.

Oss-sec: Linux kernel futex local privilege escalation (CVE-2014-3153)

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