svn commit: r321230 - head/sys/vm
Konstantin Belousov
kib at FreeBSD.org
Wed Jul 19 19:00:34 UTC 2017
Author: kib
Date: Wed Jul 19 19:00:32 2017
New Revision: 321230
URL: https://svnweb.freebsd.org/changeset/base/321230
Log:
Disable stack growth when accessed by AIO daemons.
Commit message for r321173 incorrectly stated that the change disables
automatic stack growth from the AIO daemons contexts, with explanation
that this is currently prevents applying wrong resource limits. Fix
this by actually disabling the growth.
Noted by: alc
Reviewed by: alc, jhb
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Modified:
head/sys/vm/vm_map.c
Modified: head/sys/vm/vm_map.c
==============================================================================
--- head/sys/vm/vm_map.c Wed Jul 19 18:59:26 2017 (r321229)
+++ head/sys/vm/vm_map.c Wed Jul 19 19:00:32 2017 (r321230)
@@ -3698,8 +3698,15 @@ vm_map_growstack(vm_map_t map, vm_offset_t addr, vm_ma
p = curproc;
vm = p->p_vmspace;
- if (map != &p->p_vmspace->vm_map)
+
+ /*
+ * Disallow stack growth when the access is performed by a
+ * debugger or AIO daemon. The reason is that the wrong
+ * resource limits are applied.
+ */
+ if (map != &p->p_vmspace->vm_map || p->p_textvp == NULL)
return (KERN_FAILURE);
+
MPASS(!map->system_map);
guard = stack_guard_page * PAGE_SIZE;
More information about the svn-src-head
mailing list