Date: Fri, 12 Jan 2007 16:24:23 +0000 (UTC) From: John Baldwin <jhb@FreeBSD.org> To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org, cvs-all@FreeBSD.org Subject: cvs commit: src/sys/kern uipc_usrreq.c Message-ID: <200701121624.l0CGON76022659@repoman.freebsd.org>
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jhb 2007-01-12 16:24:23 UTC
FreeBSD src repository
Modified files: (Branch: RELENG_6)
sys/kern uipc_usrreq.c
Log:
MFC: Close a race between enumerating UNIX domain socket pcb structures via
sysctl and socket teardown. Note that we engage in a bit of trickery to
preserve the ABI of 'struct unpcb' in 6.x. We change the UMA zone to hold
a 'struct unpcb_wrapper' which holds a 6.x 'struct unpcb' followed by the
new reference count needed for handling the race. We then cast 'struct
unpcb' pointers to 'struct unpcb_wrapper' pointers when we need to access
the reference count.
Submitted by: ups (including the ABI trickery)
Revision Changes Path
1.155.2.8 +36 -7 src/sys/kern/uipc_usrreq.c
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