jhb 2007-01-05 19:59:46 UTC
FreeBSD src repository
Modified files:
sys/kern kern_descrip.c uipc_usrreq.c
sys/sys file.h unpcb.h
Log:
- Close a race between enumerating UNIX domain socket pcb structures via
sysctl and socket teardown by adding a reference count to the UNIX domain
pcb object and fixing the sysctl that enumerates unpcbs to grab a
reference on each unpcb while it builds the list to copy out to userland.
- Close a race between UNIX domain pcb garbage collection (unp_gc()) and
file descriptor teardown (fdrop()) by adding a new garbage collection
flag FWAIT. unp_gc() sets FWAIT while it walks the message buffers
in a UNIX domain socket looking for nested file descriptor references
and clears the flag when it is finished. fdrop() checks to see if the
flag is set on a file descriptor whose refcount just dropped to 0 and
waits for unp_gc() to clear the flag before completely destroying the
file descriptor.
MFC after: 1 week
Reviewed by: rwatson
Submitted by: ups
Hopefully makes the panics go away: mx1
Revision Changes Path
1.300 +11 -0 src/sys/kern/kern_descrip.c
1.189 +51 -16 src/sys/kern/uipc_usrreq.c
1.73 +1 -0 src/sys/sys/file.h
1.21 +1 -0 src/sys/sys/unpcb.h
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