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freebsd-dev/sys/vm
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Konstantin Belousov 79e9552ebb Check for wrap-around in vm_phys_alloc_seg_contig(). 
It is possible to provide insane values for size in contigmalloc(9)
request, which usually not reaches the phys allocator due to failing
KVA allocation.  But with the forthcoming 4/4 i386, where 32bit
architecture has almost 4G KVA, contigmalloc(1G) is not unreasonable
outright and KVA might be available sometimes.

Then, the calculation of pa_end could wrap around, depending on the
physical address, and the checks in vm_phys_alloc_seg_contig() would
pass while the iteration in the loop after the 'done' label goes out
of the vm_page_array bounds.

Fix it by detecting the wrap.

Reported and tested by:	pho
Reviewed by:	alc, markj
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Differential revision:	https://reviews.freebsd.org/D14767
2018-03-20 16:17:55 +00:00
..
_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 sys: further adoption of SPDX licensing ID tags. 2017-11-20 19:43:44 +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 sys: further adoption of SPDX licensing ID tags. 2017-11-20 19:43:44 +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 sys: general adoption of SPDX licensing ID tags. 2017-11-27 15:23:17 +00:00
swap_pager.c Use the conventional name for an array of pages. 2018-02-16 15:38:22 +00:00
swap_pager.h sys: further adoption of SPDX licensing ID tags. 2017-11-20 19:43:44 +00:00
uma_core.c Fix boot_pages exhaustion on machines with many domains and cores, where 2018-02-09 04:45:39 +00:00
uma_dbg.c sys: general adoption of SPDX licensing ID tags. 2017-11-27 15:23:17 +00:00
uma_dbg.h sys: general adoption of SPDX licensing ID tags. 2017-11-27 15:23:17 +00:00
uma_int.h Fix three miscalculations in amount of boot pages: 2018-02-07 18:32:51 +00:00
uma.h Followup on r302393 by cperciva, improving calculation of boot pages required 2018-02-06 04:16:00 +00:00
vm_domainset.c Move VM_NUMA_ALLOC and DEVICE_NUMA under the single global config option NUMA. 2018-01-14 03:36:03 +00:00
vm_domainset.h Add files for r327895 2018-01-12 22:57:57 +00:00
vm_extern.h Use per-domain locks for vm page queue free. Move paging control from 2018-02-06 22:10:07 +00:00
vm_fault.c Avoid dequeuing the fault page during a soft fault. 2018-03-18 16:49:30 +00:00
vm_glue.c Make v_wire_count a per-cpu counter(9) counter. This eliminates a 2018-02-12 22:53:00 +00:00
vm_init.c Fix boot_pages exhaustion on machines with many domains and cores, where 2018-02-09 04:45:39 +00:00
vm_kern.c Use per-domain locks for vm page queue free. Move paging control from 2018-02-06 22:10:07 +00:00
vm_kern.h SPDX: Consider code from Carnegie-Mellon University. 2017-11-30 15:48:35 +00:00
vm_map.c Use per-domain locks for vm page queue free. Move paging control from 2018-02-06 22:10:07 +00:00
vm_map.h Assign map->header values to avoid boundary checks. 2018-01-20 12:19:02 +00:00
vm_meter.c Add a generic Proportional Integral Derivative (PID) controller algorithm and 2018-02-23 22:51:51 +00:00
vm_mmap.c Make v_wire_count a per-cpu counter(9) counter. This eliminates a 2018-02-12 22:53:00 +00:00
vm_object.c Dequeue wired pages lazily. 2018-02-07 16:57:10 +00:00
vm_object.h Use per-domain locks for vm page queue free. Move paging control from 2018-02-06 22:10:07 +00:00
vm_page.c Have vm_page_{deactivate,launder}() requeue already-queued pages. 2018-03-18 16:40:56 +00:00
vm_page.h Unify bulk free operations in several pmaps. 2018-03-04 20:53:20 +00:00
vm_pageout.c Eliminate pageout wakeup races. Take another step towards lockless 2018-03-15 19:23:07 +00:00
vm_pageout.h Fix GCC build: Remove redundant pagedaemon_wakeup declaration 2018-03-16 07:05:09 +00:00
vm_pagequeue.h Eliminate pageout wakeup races. Take another step towards lockless 2018-03-15 19:23:07 +00:00
vm_pager.c SPDX: Consider code from Carnegie-Mellon University. 2017-11-30 15:48:35 +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 Check for wrap-around in vm_phys_alloc_seg_contig(). 2018-03-20 16:17:55 +00:00
vm_phys.h Use per-domain locks for vm page queue free. Move paging control from 2018-02-06 22:10:07 +00:00
vm_radix.c Fix boot_pages calculation for machines that don't have UMA_MD_SMALL_ALLOC. 2018-02-06 22:06:59 +00:00
vm_radix.h sys: general adoption of SPDX licensing ID tags. 2017-11-27 15:23:17 +00:00
vm_reserv.c Eliminate pageout wakeup races. Take another step towards lockless 2018-03-15 19:23:07 +00:00
vm_reserv.h Use per-domain locks for vm page queue free. Move paging control from 2018-02-06 22:10:07 +00:00
vm_swapout_dummy.c SPDX: Consider code from Carnegie-Mellon University. 2017-11-30 15:48:35 +00:00
vm_swapout.c Dequeue wired pages lazily. 2018-02-07 16:57:10 +00:00
vm_unix.c ANSIfy function definitions in sys/vm/ 2018-01-12 03:50:44 +00:00
vm.h SPDX: Consider code from Carnegie-Mellon University. 2017-11-30 15:48:35 +00:00
vnode_pager.c Use per-domain locks for vm page queue free. Move paging control from 2018-02-06 22:10:07 +00:00
vnode_pager.h sys: further adoption of SPDX licensing ID tags. 2017-11-20 19:43:44 +00:00