freebsd-dev/sys/vm
Konstantin Belousov df08823d07 Improve MD page fault handlers.
Centralize calculation of signal and ucode delivered on unhandled page
fault in new function vm_fault_trap().  MD trap_pfault() now almost
always uses the signal numbers and error codes calculated in
consistent MI way.

This introduces the protection fault compatibility sysctls to all
non-x86 architectures which did not have that bug, but apparently they
were already much more wrong in selecting delivered signals on
protection violations.

Change the delivered signal for accesses to mapped area after the
backing object was truncated.  According to POSIX description for
mmap(2):
   The system shall always zero-fill any partial page at the end of an
   object. Further, the system shall never write out any modified
   portions of the last page of an object which are beyond its
   end. References within the address range starting at pa and
   continuing for len bytes to whole pages following the end of an
   object shall result in delivery of a SIGBUS signal.

   An implementation may generate SIGBUS signals when a reference
   would cause an error in the mapped object, such as out-of-space
   condition.
Adjust according to the description, keeping the existing
compatibility code for SIGSEGV/SIGBUS on protection failures.

For situations where kernel cannot handle page fault due to resource
limit enforcement, SIGBUS with a new error code BUS_OBJERR is
delivered.  Also, provide a new error code SEGV_PKUERR for SIGSEGV on
amd64 due to protection key access violation.

vm_fault_hold() is renamed to vm_fault().  Fixed some nits in
trap_pfault()s like mis-interpreting Mach errors as errnos.  Removed
unneeded truncations of the fault addresses reported by hardware.

PR:	211924
Reviewed by:	alc
Discussed with:	jilles, markj
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Differential revision:	https://reviews.freebsd.org/D21566
2019-09-27 18:43:36 +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 Change synchonization rules for vm_page reference counting. 2019-09-09 21:32:42 +00:00
memguard.c Add a vm_page_wired() predicate. 2019-06-02 01:00:17 +00:00
memguard.h sys: general adoption of SPDX licensing ID tags. 2017-11-27 15:23:17 +00:00
phys_pager.c Use the sleepq lock rather than the page lock to protect against wakeup 2019-09-10 18:27:45 +00:00
pmap.h correct pmap_ts_referenced return type 2019-07-03 19:59:56 +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 Revert r352406, which contained changes I didn't intend to commit. 2019-09-16 15:04:45 +00:00
swap_pager.h sys: further adoption of SPDX licensing ID tags. 2017-11-20 19:43:44 +00:00
uma_core.c Extend uma_reclaim() to permit different reclamation targets. 2019-09-01 22:22:43 +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 Extend uma_reclaim() to permit different reclamation targets. 2019-09-01 22:22:43 +00:00
uma.h vfs: manage mnt_ref with atomics 2019-09-16 21:31:02 +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 Improve MD page fault handlers. 2019-09-27 18:43:36 +00:00
vm_fault.c Improve MD page fault handlers. 2019-09-27 18:43:36 +00:00
vm_glue.c sys/vm/vm_glue.c: Incorrect function name in panic string 2019-09-19 07:28:24 +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 Map the vm_page array into KVA on amd64. 2019-09-03 13:18:51 +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 Improve MD page fault handlers. 2019-09-27 18:43:36 +00:00
vm_map.h vm pager: writemapping accounting for OBJT_SWAP 2019-09-03 20:31:48 +00:00
vm_meter.c Provide separate accounting for user-wired pages. 2019-05-13 16:38:48 +00:00
vm_mmap.c Revert r352406, which contained changes I didn't intend to commit. 2019-09-16 15:04:45 +00:00
vm_object.c Fix object locking in vm_object_unwire() after r352174. 2019-09-27 16:41:34 +00:00
vm_object.h vm pager: writemapping accounting for OBJT_SWAP 2019-09-03 20:31:48 +00:00
vm_page.c Fix a race in vm_page_swapqueue(). 2019-09-27 16:46:08 +00:00
vm_page.h Complete the removal of the "wire_count" field from struct vm_page. 2019-09-25 16:11:35 +00:00
vm_pageout.c Revert r352406, which contained changes I didn't intend to commit. 2019-09-16 15:04:45 +00:00
vm_pageout.h Fix OOM handling of some corner cases. 2019-08-16 09:43:49 +00:00
vm_pagequeue.h Revert r352406, which contained changes I didn't intend to commit. 2019-09-16 15:04:45 +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 vm pager: writemapping accounting for OBJT_SWAP 2019-09-03 20:31:48 +00:00
vm_param.h Improve MD page fault handlers. 2019-09-27 18:43:36 +00:00
vm_phys.c Remove unnecessary debugging from r351181 that caused powerpc build to fail. 2019-08-18 08:07:31 +00:00
vm_phys.h Encapsulate phys_avail manipulation in a set of simple routines. Add a 2019-08-18 07:06:31 +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 Allocate amd64's page array using pages and page directory pages from the 2019-08-18 23:07:56 +00:00
vm_reserv.h Allocate amd64's page array using pages and page directory pages from the 2019-08-18 23:07:56 +00:00
vm_swapout_dummy.c SPDX: Consider code from Carnegie-Mellon University. 2017-11-30 15:48:35 +00:00
vm_swapout.c Revert r352406, which contained changes I didn't intend to commit. 2019-09-16 15:04:45 +00:00
vm_unix.c Provide separate accounting for user-wired pages. 2019-05-13 16:38:48 +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
vnode_pager.c vm pager: writemapping accounting for OBJT_SWAP 2019-09-03 20:31:48 +00:00
vnode_pager.h vm pager: writemapping accounting for OBJT_SWAP 2019-09-03 20:31:48 +00:00