svn commit: r352017 - head/sys/kern

[Konstantin Belousov]

Author: kib
Date: Sat Sep  7 16:10:57 2019
New Revision: 352017
URL: https://svnweb.freebsd.org/changeset/base/352017

Log:
  In do_execve(), use shared text vnode lock consistently.
  
  Reviewed by:	markj
  MFC after:	1 week
  Differential revision:	https://reviews.freebsd.org/D21560

Modified:
  head/sys/kern/kern_exec.c

Modified: head/sys/kern/kern_exec.c
==============================================================================
--- head/sys/kern/kern_exec.c	Sat Sep  7 16:05:17 2019	(r352016)
+++ head/sys/kern/kern_exec.c	Sat Sep  7 16:10:57 2019	(r352017)
@@ -526,7 +526,7 @@ interpret:
 			euip = uifind(attr.va_uid);
 			change_euid(imgp->newcred, euip);
 		}
-		vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY);
+		vn_lock(imgp->vp, LK_SHARED | LK_RETRY);
 		if (attr.va_mode & S_ISGID)
 			change_egid(imgp->newcred, attr.va_gid);
 		/*
@@ -555,7 +555,7 @@ interpret:
 		    oldcred->cr_svgid != oldcred->cr_gid) {
 			VOP_UNLOCK(imgp->vp, 0);
 			imgp->newcred = crdup(oldcred);
-			vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY);
+			vn_lock(imgp->vp, LK_SHARED | LK_RETRY);
 			change_svuid(imgp->newcred, imgp->newcred->cr_uid);
 			change_svgid(imgp->newcred, imgp->newcred->cr_gid);
 		}
@@ -572,7 +572,7 @@ interpret:
 		if (vn_fullpath(td, imgp->vp, &imgp->execpath,
 		    &imgp->freepath) != 0)
 			imgp->execpath = args->fname;
-		vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY);
+		vn_lock(imgp->vp, LK_SHARED | LK_RETRY);
 	}
 
 	/*