Date: Tue, 13 Aug 2002 01:47:19 -0700 (PDT) From: Alfred Perlstein <alfred@FreeBSD.org> To: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org Subject: cvs commit: src/sys/kern sysv_sem.c Message-ID: <200208130847.g7D8lKKQ036126@freefall.freebsd.org>
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alfred 2002/08/13 01:47:17 PDT
Modified files:
sys/kern sysv_sem.c
Log:
Make SYSVSEM mpsafe. Each semaphore set gets its own lock, however
there is a global lock over the undo structures because of the way
they are managed.
Switch to using SLIST instead of rolling our own linked list.
Fix several races where a permission check was done before a
copyin/copyout, if the copy happened to fault it may have been
possible to race for access to a semaphore set that one shouldn't
have access to.
Requested by: rwatson
Tested by: NetBSD regression suite.
Revision Changes Path
1.55 +172 -87 src/sys/kern/sysv_sem.c
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