Author: kib
Date: Fri May 23 11:56:32 2014
New Revision: 266585
URL: http://svnweb.freebsd.org/changeset/base/266585
Log:
MFC r266464:
In execve(2), postpone the free of old vmspace until the threads are resumed
and exited.
Approved by: re (marius)
Modified:
stable/9/sys/kern/kern_exec.c
stable/9/sys/sys/proc.h
stable/9/sys/vm/vm_map.c
Directory Properties:
stable/9/sys/ (props changed)
stable/9/sys/sys/ (props changed)
Modified: stable/9/sys/kern/kern_exec.c
==============================================================================
--- stable/9/sys/kern/kern_exec.c Fri May 23 11:22:44 2014
(r266584)
+++ stable/9/sys/kern/kern_exec.c Fri May 23 11:56:32 2014
(r266585)
@@ -282,6 +282,7 @@ kern_execve(td, args, mac_p)
struct mac *mac_p;
{
struct proc *p = td->td_proc;
+ struct vmspace *oldvmspace;
int error;
AUDIT_ARG_ARGV(args->begin_argv, args->argc,
@@ -298,6 +299,8 @@ kern_execve(td, args, mac_p)
PROC_UNLOCK(p);
}
+ KASSERT((td->td_pflags & TDP_EXECVMSPC) == 0, ("nested execve"));
+ oldvmspace = td->td_proc->p_vmspace;
error = do_execve(td, args, mac_p);
if (p->p_flag & P_HADTHREADS) {
@@ -312,6 +315,12 @@ kern_execve(td, args, mac_p)
thread_single_end();
PROC_UNLOCK(p);
}
+ if ((td->td_pflags & TDP_EXECVMSPC) != 0) {
+ KASSERT(td->td_proc->p_vmspace != oldvmspace,
+ ("oldvmspace still used"));
+ vmspace_free(oldvmspace);
+ td->td_pflags &= ~TDP_EXECVMSPC;
+ }
return (error);
}
Modified: stable/9/sys/sys/proc.h
==============================================================================
--- stable/9/sys/sys/proc.h Fri May 23 11:22:44 2014 (r266584)
+++ stable/9/sys/sys/proc.h Fri May 23 11:56:32 2014 (r266585)
@@ -426,6 +426,7 @@ do {
\
#define TDP_NERRNO 0x08000000 /* Last errno is already in td_errno
*/
#define TDP_UIOHELD 0x10000000 /* Current uio has pages held in
td_ma */
#define TDP_DEVMEMIO 0x20000000 /* Accessing memory for /dev/mem */
+#define TDP_EXECVMSPC 0x40000000 /* Execve destroyed old vmspace */
/*
* Reasons that the current thread can not be run yet.
Modified: stable/9/sys/vm/vm_map.c
==============================================================================
--- stable/9/sys/vm/vm_map.c Fri May 23 11:22:44 2014 (r266584)
+++ stable/9/sys/vm/vm_map.c Fri May 23 11:56:32 2014 (r266585)
@@ -3752,6 +3752,8 @@ vmspace_exec(struct proc *p, vm_offset_t
struct vmspace *oldvmspace = p->p_vmspace;
struct vmspace *newvmspace;
+ KASSERT((curthread->td_pflags & TDP_EXECVMSPC) == 0,
+ ("vmspace_exec recursed"));
newvmspace = vmspace_alloc(minuser, maxuser);
if (newvmspace == NULL)
return (ENOMEM);
@@ -3768,7 +3770,7 @@ vmspace_exec(struct proc *p, vm_offset_t
PROC_VMSPACE_UNLOCK(p);
if (p == curthread->td_proc)
pmap_activate(curthread);
- vmspace_free(oldvmspace);
+ curthread->td_pflags |= TDP_EXECVMSPC;
return (0);
}
_______________________________________________
svn-src-all@freebsd.org mailing list
http://lists.freebsd.org/mailman/listinfo/svn-src-all
To unsubscribe, send any mail to "svn-src-all-unsubscr...@freebsd.org"
