Mark Johnston 64087fd7f3 Disallow preemptive creation of wired superpage mappings. ... There are some unusual cases where a process may cause an mlock()ed range of memory to be unmapped. If the application subsequently faults on that region, the handler may attempt to create a superpage mapping backed by the resident, wired pages. However, the pmap code responsible for creating such a mapping (pmap_enter_pde() on i386 and amd64) does not ensure that a leaf page table page is available if the superpage is later demoted; the demotion operation must therefore perform a non-blocking page allocation and must unmap the entire superpage if the allocation fails. The pmap layer ensures that this can never happen for wired mappings, and so the case described above breaks that invariant. For now, simply ensure that the MI fault handler never attempts to create a wired superpage except via promotion. Reviewed by: kib Reported by: syzbot+292d3b0416c27c131505@syzkaller.appspotmail.com MFC after: 2 weeks Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D19670		2019-03-21 19:52:50 +00:00
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_vm_radix.h	sys: general adoption of SPDX licensing ID tags.	2017-11-27 15:23:17 +00:00
default_pager.c	SPDX: wrong license.	2017-11-30 15:45:42 +00:00
device_pager.c	Change the vm_ooffset_t type to unsigned.	2018-12-02 13:16:46 +00:00
memguard.c	Eliminate kmem_arena and kmem_object in preparation for further NUMA commits.	2017-11-28 23:40:54 +00:00
memguard.h	sys: general adoption of SPDX licensing ID tags.	2017-11-27 15:23:17 +00:00
phys_pager.c	sys: general adoption of SPDX licensing ID tags.	2017-11-27 15:23:17 +00:00
pmap.h	Add pmap_is_valid_memattr(9).	2018-08-01 18:45:51 +00:00
redzone.c	sys: general adoption of SPDX licensing ID tags.	2017-11-27 15:23:17 +00:00
redzone.h	sys: general adoption of SPDX licensing ID tags.	2017-11-27 15:23:17 +00:00
sg_pager.c	Change the vm_ooffset_t type to unsigned.	2018-12-02 13:16:46 +00:00
swap_pager.c	struct xswdev on amd64 requires compat32 shims after ino64.	2019-02-10 19:01:05 +00:00
swap_pager.h	sys: further adoption of SPDX licensing ID tags.	2017-11-20 19:43:44 +00:00
uma.h	o Move zone limit from keg level up to zone level. This means that now	2019-01-15 00:02:06 +00:00
uma_core.c	UMA: unsign some variables related to allocation in hash_alloc().	2019-02-12 04:33:05 +00:00
uma_dbg.c	Fix compilation failures on different arches that have vm_machdep.c not	2019-01-15 19:33:47 +00:00
uma_dbg.h	sys: general adoption of SPDX licensing ID tags.	2017-11-27 15:23:17 +00:00
uma_int.h	UMA: unsign some variables related to allocation in hash_alloc().	2019-02-12 04:33:05 +00:00
vm.h	Move vm_ndomains to vm.h where it can be used with a single header include	2018-03-27 03:27:02 +00:00
vm_domainset.c	Add a !NUMA definition for vm_domainset_iter_policy_ref_init().	2018-10-24 17:09:20 +00:00
vm_domainset.h	Refactor domainset iterators for use by malloc(9) and UMA.	2018-10-23 16:35:58 +00:00
vm_extern.h	Add malloc_domainset(9) and _domainset variants to other allocator KPIs.	2018-10-30 18:26:34 +00:00
vm_fault.c	Disallow preemptive creation of wired superpage mappings.	2019-03-21 19:52:50 +00:00
vm_glue.c	Refactor domainset iterators for use by malloc(9) and UMA.	2018-10-23 16:35:58 +00:00
vm_init.c	Do not reserve KVA for paging bufs in vm_ksubmap_init(), since now	2019-01-16 20:14:16 +00:00
vm_kern.c	Improve vmem tuning for platforms without a direct map.	2019-02-25 19:22:13 +00:00
vm_kern.h	Do not reserve KVA for paging bufs in vm_ksubmap_init(), since now	2019-01-16 20:14:16 +00:00
vm_map.c	Add kernel support for Intel userspace protection keys feature on	2019-02-20 09:51:13 +00:00
vm_map.h	Implement Address Space Layout Randomization (ASLR)	2019-02-10 17:19:45 +00:00
vm_meter.c	Add a per-pagequeue pdpages counter.	2018-08-23 21:03:45 +00:00
vm_mmap.c	i386: honor kern.elf32.read_exec for ommap(2) and break(2), as already	2019-02-09 03:56:48 +00:00
vm_object.c	Include path for tmpfs objects in vm.objects sysctl	2018-11-30 04:59:43 +00:00
vm_object.h	Change the vm_ooffset_t type to unsigned.	2018-12-02 13:16:46 +00:00
vm_page.c	Implement minidump support for RISC-V.	2019-03-06 00:01:06 +00:00
vm_page.h	Allow vm_page_free_prep() to dequeue pages without the page lock.	2019-02-03 18:43:20 +00:00
vm_pageout.c	Clear pointers to indicate that the respective locks are released.	2019-02-21 15:44:32 +00:00
vm_pageout.h	linuxkpi: Use pageproc instead of vmproc	2018-11-21 04:34:18 +00:00
vm_pagequeue.h	Allow empty NUMA memory domains to support Threadripper2	2018-10-01 14:14:21 +00:00
vm_pager.c	Do not reserve KVA for paging bufs in vm_ksubmap_init(), since now	2019-01-16 20:14:16 +00:00
vm_pager.h	sys: further adoption of SPDX licensing ID tags.	2017-11-20 19:43:44 +00:00
vm_param.h	SPDX: Consider code from Carnegie-Mellon University.	2017-11-30 15:48:35 +00:00
vm_phys.c	vm: remove seq.h inclusion made obsolete by NUMA rewrite	2019-02-27 22:42:29 +00:00
vm_phys.h	MI VM: Make it possible to set size of superpage at boot instead of compile time.	2019-01-18 13:35:06 +00:00
vm_radix.c	vm: stop passing M_ZERO when allocating radix nodes	2018-06-24 13:08:05 +00:00
vm_radix.h	sys: general adoption of SPDX licensing ID tags.	2017-11-27 15:23:17 +00:00
vm_reserv.c	MI VM: Make it possible to set size of superpage at boot instead of compile time.	2019-01-18 13:35:06 +00:00
vm_reserv.h	Lock reservations with a dedicated lock in each reservation. Protect the	2018-03-22 19:21:11 +00:00
vm_swapout.c	linuxkpi: Use pageproc instead of vmproc	2018-11-21 04:34:18 +00:00
vm_swapout_dummy.c	SPDX: Consider code from Carnegie-Mellon University.	2017-11-30 15:48:35 +00:00
vm_unix.c	i386: honor kern.elf32.read_exec for ommap(2) and break(2), as already	2019-02-09 03:56:48 +00:00
vnode_pager.c	Fix incorrect assertion in vnode_pager_generic_getpages()	2019-02-26 04:50:46 +00:00
vnode_pager.h	sys: further adoption of SPDX licensing ID tags.	2017-11-20 19:43:44 +00:00