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Disable stack growth when accessed by AIO daemons.

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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
This commit is contained in:
Konstantin Belousov 2017-07-19 19:00:32 +00:00
parent 5a3924b985
commit eb5ea8788f
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=321230
1 changed files with 8 additions and 1 deletions
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9
sys/vm/vm_map.c
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@ -3698,8 +3698,15 @@ vm_map_growstack(vm_map_t map, vm_offset_t addr, vm_map_entry_t gap_entry)
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;