Date: Thu, 9 Feb 2012 10:30:45 +0000 (UTC) From: Konstantin Belousov <kib@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-9@freebsd.org Subject: svn commit: r231268 - stable/9/sys/kern Message-ID: <201202091030.q19AUjVW094185@svn.freebsd.org>
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Author: kib Date: Thu Feb 9 10:30:45 2012 New Revision: 231268 URL: http://svn.freebsd.org/changeset/base/231268 Log: MFC r230341: Use shared lock for the executable vnode in the exec path after the VV_TEXT changes are handled. Assert that vnode is exclusively locked at the places that modify VV_TEXT. Modified: stable/9/sys/kern/kern_exec.c Directory Properties: stable/9/sys/ (props changed) Modified: stable/9/sys/kern/kern_exec.c ============================================================================== --- stable/9/sys/kern/kern_exec.c Thu Feb 9 10:22:08 2012 (r231267) +++ stable/9/sys/kern/kern_exec.c Thu Feb 9 10:30:45 2012 (r231268) @@ -471,6 +471,7 @@ interpret: * actually an executable image. */ textset = imgp->vp->v_vflag & VV_TEXT; + ASSERT_VOP_ELOCKED(imgp->vp, "vv_text"); imgp->vp->v_vflag |= VV_TEXT; error = exec_map_first_page(imgp); @@ -502,8 +503,10 @@ interpret: if (error) { if (error == -1) { - if (textset == 0) + if (textset == 0) { + ASSERT_VOP_ELOCKED(imgp->vp, "vv_text"); imgp->vp->v_vflag &= ~VV_TEXT; + } error = ENOEXEC; } goto exec_fail_dealloc; @@ -596,7 +599,7 @@ interpret: /* close files on exec */ fdcloseexec(td); - vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY); + vn_lock(imgp->vp, LK_SHARED | LK_RETRY); /* Get a reference to the vnode prior to locking the proc */ VREF(binvp); @@ -701,7 +704,7 @@ interpret: VOP_UNLOCK(imgp->vp, 0); setugidsafety(td); error = fdcheckstd(td); - vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY); + vn_lock(imgp->vp, LK_SHARED | LK_RETRY); if (error != 0) goto done1; PROC_LOCK(p); @@ -805,7 +808,7 @@ interpret: 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); + vn_lock(imgp->vp, LK_SHARED | LK_RETRY); } else PROC_UNLOCK(p); #else /* !HWPMC_HOOKS */ @@ -857,7 +860,7 @@ done1: if (tracecred != NULL) crfree(tracecred); #endif - vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY); + vn_lock(imgp->vp, LK_SHARED | LK_RETRY); pargs_drop(oldargs); pargs_drop(newargs); if (oldsigacts != NULL)
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