جزئیات آسیب‌پذیری

In the Linux kernel, the following vulnerability has been resolved: af_unix: Set gc_in_progress to true in unix_gc(). Igor Ushakov reported that unix_gc() could run with gc_in_progress being false if the work is scheduled while running: Thread 1 Thread 2 Thread 3 -------- -------- -------- unix_schedule_gc() unix_schedule_gc() `- if (!gc_in_progress) `- if (!gc_in_progress) |- gc_in_progress = true | `- queue_work() | unix_gc() <----------------/ | | |- gc_in_progress = true ... `- queue_work() | | `- gc_in_progress = false | | unix_gc() <---------------------------------------------' | ... /* gc_in_progress == false */ | `- gc_in_progress = false unix_peek_fpl() relies on gc_in_progress not to confuse GC by MSG_PEEK. Let's set gc_in_progress to true in unix_gc().

• https://git.kernel.org/stable/c/20aa894d475bd8086b25c1113ec4ca70f70c7a98
• https://git.kernel.org/stable/c/82c17e13d404f686e164590483fd6c1abaa675d0
• https://git.kernel.org/stable/c/591f1ac217428a6d2b32a8ac14aac0fab44f155a
• https://git.kernel.org/stable/c/0cfa78c050662784fc8e3ab26dbfd1dc632b2082
• https://git.kernel.org/stable/c/d82ba05263c69fa2437fe93e4e561cc40f4c03af