Author: kib
Date: Wed Sep 9 10:52:36 2009
New Revision: 197031
URL: http://svn.freebsd.org/changeset/base/197031
Log:
Unlock the image vnode around the call of pmc PMC_FN_PROCESS_EXEC hook.
The hook calls vn_fullpath(9), that should not be executed with a vnode
lock held.
Reported by: Bruce Cran <bruce cran org uk>
Tested by: pho
MFC after: 3 days
Modified:
head/sys/kern/kern_exec.c
Modified: head/sys/kern/kern_exec.c
==============================================================================
--- head/sys/kern/kern_exec.c Wed Sep 9 10:51:50 2009 (r197030)
+++ head/sys/kern/kern_exec.c Wed Sep 9 10:52:36 2009 (r197031)
@@ -786,10 +786,12 @@ interpret:
*/
if (PMC_SYSTEM_SAMPLING_ACTIVE() || PMC_PROC_IS_USING_PMCS(p)) {
PROC_UNLOCK(p);
+ VOP_UNLOCK(imgp->vp, 0);
pe.pm_credentialschanged = credential_changing;
pe.pm_entryaddr = imgp->entry_addr;
PMC_CALL_HOOK_X(td, PMC_FN_PROCESS_EXEC, (void *) &pe);
+ vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY);
} else
PROC_UNLOCK(p);
#else /* !HWPMC_HOOKS */
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