device_pager: Add cdev_pager_get_path to retrieve the "path" for an object

This wraps a new optional cdev_pg_path method in struct
cdev_pager_ops. If the method pointer is NULL, the function does
n

device_pager: Add cdev_pager_get_path to retrieve the "path" for an object

This wraps a new optional cdev_pg_path method in struct
cdev_pager_ops. If the method pointer is NULL, the function does
nothing. The old device pager reads the pathname of the cdev stored
in the object handle to match the existing code.

Retire the OBJ_CDEVH flag as it is no longer needed.

Reviewed by: kib
Differential Revision: https://reviews.freebsd.org/D49335

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Export the kernel API pgrp_calc_jobc

Summary: Export the kernel API pgrp_calc_jobc for use by other modules or functions.

Reviewed By: kib
Obtained from: Juniper Networks, Inc.
Differential Revisio

Export the kernel API pgrp_calc_jobc

Summary: Export the kernel API pgrp_calc_jobc for use by other modules or functions.

Reviewed By: kib
Obtained from: Juniper Networks, Inc.
Differential Revision: https://reviews.freebsd.org/D47539

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pfind: Fix coments

PR: 283093
Reviewed by: imp

sys/vm: remove support for growing-up stacks

Reviewed by: alc, dougm, markj
Sponsored by: The FreeBSD Foundation
Differential revision: https://reviews.freebsd.org/D47892

vm_object: do not assume that un_pager.devp.dev is cdev

It is subtype-specific handle. Mark OBJT_DEVICE that do fill cdev into
the handle, with a new object flag OBJ_CDEVH.

PR: 282533
Reviewed by:

vm_object: do not assume that un_pager.devp.dev is cdev

It is subtype-specific handle. Mark OBJT_DEVICE that do fill cdev into
the handle, with a new object flag OBJ_CDEVH.

PR: 282533
Reviewed by: markj
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D47443

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device_pager: rename the un_pager.devp.dev field to handle

because it is not neccessary struct cdev *.

Reviewed by: markj
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revisio

device_pager: rename the un_pager.devp.dev field to handle

because it is not neccessary struct cdev *.

Reviewed by: markj
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D47443

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kinfo_vmentry: report cdev name for device mappings

Reviewed by: emaste, markj
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D47038

sys/user.h: report posix shm mappings

Add flag KVME_FLAG_POSIXSHM. Fill kve_path with the path of the
segment.

Reviewed by: markj
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differentia

sys/user.h: report posix shm mappings

Add flag KVME_FLAG_POSIXSHM. Fill kve_path with the path of the
segment.

Reviewed by: markj
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D46970

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kinfo_{vmobject,vmentry}: move copy of pathes into the vnode handling scope

Reviewed by: markj
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.o

kinfo_{vmobject,vmentry}: move copy of pathes into the vnode handling scope

Reviewed by: markj
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D46970

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kinfo_vmentry: report max protection

Reviewed by: brooks, markj
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D46971

kinfo_vmentry: report mappings of the SysV shm segments

Mark such mappings with the new flag KVME_FLAG_SYSVSHM.
Provide segment key in kve_vn_fileid, vnode never can back shm mapping.
Provide sequen

kinfo_vmentry: report mappings of the SysV shm segments

Mark such mappings with the new flag KVME_FLAG_SYSVSHM.
Provide segment key in kve_vn_fileid, vnode never can back shm mapping.
Provide sequence number in kve_vn_fsid_freebsd11.

Reviewed by: markj (previous version)
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D46959

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proc: Remove kernel stack swapping support, part 6

- Remove most checks of the P_INMEM flag.
- Some uses remain since a few userspace tools, e.g., ps(1) and top(1)
expect the flag to be set. Thes

proc: Remove kernel stack swapping support, part 6

- Remove most checks of the P_INMEM flag.
- Some uses remain since a few userspace tools, e.g., ps(1) and top(1)
expect the flag to be set. These can be cleaned up but the code has
most likely been copy-pasted elsewhere and while linger for a long
time.

Tested by: pho
Reviewed by: alc, imp, kib
Differential Revision: https://reviews.freebsd.org/D46117

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thread: Remove kernel stack swapping support, part 4

- Remove the IS_SWAPPED thread inhibitor state.
- Remove all uses of TD_IS_SWAPPED() in the kernel.
- Remove the TDF_CANSWAP flag.
- Remove the P

thread: Remove kernel stack swapping support, part 4

- Remove the IS_SWAPPED thread inhibitor state.
- Remove all uses of TD_IS_SWAPPED() in the kernel.
- Remove the TDF_CANSWAP flag.
- Remove the P_SWAPPINGOUT and P_SWAPPINGIN flags.

Tested by: pho
Reviewed by: alc, imp, kib
Differential Revision: https://reviews.freebsd.org/D46115

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arm64: Support the L3 ATTR_CONTIGUOUS page size in pagesizes[]

Update pagesizes[] to include the L3 ATTR_CONTIGUOUS (L3C) page size,
which is 64KB when the base page size is 4KB and 2MB when the bas

arm64: Support the L3 ATTR_CONTIGUOUS page size in pagesizes[]

Update pagesizes[] to include the L3 ATTR_CONTIGUOUS (L3C) page size,
which is 64KB when the base page size is 4KB and 2MB when the base page
size is 16KB.

Add support for L3C pages to shm_create_largepage().

Add support for creating L3C page mappings to pmap_enter(psind=1).

Add support for reporting L3C page mappings to mincore(2) and
procstat(8).

Update vm_fault_soft_fast() and vm_fault_populate() to handle multiple
superpage sizes.

Declare arm64 as supporting two superpage reservation sizes, and
simulate two superpage reservation sizes, updating the vm_page's psind
field to reflect the correct page size from pagesizes[]. (The next
patch in this series will replace this simulation. This patch is
already big enough.)

Co-authored-by: Eliot Solomon <ehs3@rice.edu>
Reviewed by: kib
Differential Revision: https://reviews.freebsd.org/D45766

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stop_all_proc(): skip traced or signal-stoped processes

Since thread_single(SINGLE_ALLPROC) ignores them since 9241ebc796c,
and there is not much we can do for the debugger-controlled process.

Note

stop_all_proc(): skip traced or signal-stoped processes

Since thread_single(SINGLE_ALLPROC) ignores them since 9241ebc796c,
and there is not much we can do for the debugger-controlled process.

Noted by: olce
Reviewed by: markj, olce
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D44638

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EVFILT_TIMER: intialize stop timer list in type-stable proc init, instead of fork

Since kqueue timer may exist after the process that created it exited
(same scenario with rfork(2) as in PR 275286),

EVFILT_TIMER: intialize stop timer list in type-stable proc init, instead of fork

Since kqueue timer may exist after the process that created it exited
(same scenario with rfork(2) as in PR 275286), make the tailq
p_kqtim_stop accessed by filt_timerdetach() type-stable.

Noted and reviewed by: markj
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D42777

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sys: Remove ancient SCCS tags.

Remove ancient SCCS tags from the tree, automated scripting, with two
minor fixup to keep things compiling. All the common forms in the tree
were removed with a perl s

sys: Remove ancient SCCS tags.

Remove ancient SCCS tags from the tree, automated scripting, with two
minor fixup to keep things compiling. All the common forms in the tree
were removed with a perl script.

Sponsored by: Netflix

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proc: Add sysctl flag CTLFLAG_TUN to loader tunable

The sysctl variable 'kern.kstack_pages' is actually a loader tunable.
Add sysctl flag CTLFLAG_TUN to it so that `sysctl -T` will report it
correct

proc: Add sysctl flag CTLFLAG_TUN to loader tunable

The sysctl variable 'kern.kstack_pages' is actually a loader tunable.
Add sysctl flag CTLFLAG_TUN to it so that `sysctl -T` will report it
correctly.

No functional change intended.

Note that on arm64 the thread0 stack size can not be controlled with it,
kib@ suggested that arm64 maintainers can fix it eventually so let's
enable it also on arm64 right now.

Reviewed by: kib, imp
MFC after: 3 days
Differential Revision: https://reviews.freebsd.org/D42113

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sys: Remove $FreeBSD$: one-line .c pattern

Remove /^[\s*]*__FBSDID\("\$FreeBSD\$"\);?\s*\n/

killpg(): more carefully avoid LoR

otherwise we could end up with the livelock. When pg_killsx trylock
failed, ensure that we do wait for lock availability before retry.

Reported and tested by: ph

killpg(): more carefully avoid LoR

otherwise we could end up with the livelock. When pg_killsx trylock
failed, ensure that we do wait for lock availability before retry.

Reported and tested by: pho
Sponsored by: The FreeBSD Foundation
MFC after: 1 week

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KERN_PROC_VM_LAYOUT sysctl: fix bug in 32-bit-compatible path

vmspace_free() is called redundantly in the 32-bit-compatible
path in sysctl_kern_proc_vm_layout(), causing a premature free
(possibly f

KERN_PROC_VM_LAYOUT sysctl: fix bug in 32-bit-compatible path

vmspace_free() is called redundantly in the 32-bit-compatible
path in sysctl_kern_proc_vm_layout(), causing a premature free
(possibly for the current address space). Remove the extra call.

PR: 272401
Reported by: marklmi at yahoo.com
Reviewed by: markj
Differential Revision: https://reviews.freebsd.org/D40908

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killpg(2): close a race with fork(2), part1

If the process group member performs fork(), the child could escape
signalling from killpg(). Prevent it by introducing an sx process group
lock pg_killsx

killpg(2): close a race with fork(2), part1

If the process group member performs fork(), the child could escape
signalling from killpg(). Prevent it by introducing an sx process group
lock pg_killsx which is taken interruptibly shared around fork. If there
is a pending signal, do the trip through userspace with ERESTART to
handle signal ASTs. The lock is taken exclusively during killpg().

The lock is also locked exclusive when the process changes group
membership, to avoid escaping a signal by this means, by ensuring that
the process group is stable during fork.

Note that the new lock is before proctree lock, so in some situations we
could only do trylocking to obtain it.

This relatively simple approach cannot work for REAP_KILL, because
process potentially belongs to more than one reaper tree by having
sub-reapers.

Reported by: dchagin
Tested by: dchagin, pho
Reviewed by: markj
Sponsored by: The FreeBSD Foundation
MFC after: 2 weeks
Differential revision: https://reviews.freebsd.org/D40493

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AST: rework

Make most AST handlers dynamically registered. This allows to have
subsystem-specific handler source located in the subsystem files,
instead of making subr_trap.c aware of it. For inst

AST: rework

Make most AST handlers dynamically registered. This allows to have
subsystem-specific handler source located in the subsystem files,
instead of making subr_trap.c aware of it. For instance, signal
delivery code on return to userspace is now moved to kern_sig.c.

Also, it allows to have some handlers designated as the cleanup (kclear)
type, which are called both at AST and on thread/process exit. For
instance, ast(), exit1(), and NFS server no longer need to be aware
about UFS softdep processing.

The dynamic registration also allows third-party modules to register AST
handlers if needed. There is one caveat with loadable modules: the
code does not make any effort to ensure that the module is not unloaded
before all threads processed through AST handler in it. In fact, this
is already present behavior for hwpmc.ko and ufs.ko. I do not think it
is worth the efforts and the runtime overhead to try to fix it.

Reviewed by: markj
Tested by: emaste (arm64), pho
Discussed with: jhb
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D35888

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ddb: annotate some commands with DB_CMD_MEMSAFE

This is not completely exhaustive, but covers a large majority of
commands in the tree.

Reviewed by: markj
Sponsored by: Juniper Networks, Inc.
Spons

ddb: annotate some commands with DB_CMD_MEMSAFE

This is not completely exhaustive, but covers a large majority of
commands in the tree.

Reviewed by: markj
Sponsored by: Juniper Networks, Inc.
Sponsored by: Klara, Inc.
Differential Revision: https://reviews.freebsd.org/D35583

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Implement shared page address randomization

It used to be mapped at the top of the UVA.
If the randomization is enabled any address above .data section will be
randomly chosen and a guard page will

Implement shared page address randomization

It used to be mapped at the top of the UVA.
If the randomization is enabled any address above .data section will be
randomly chosen and a guard page will be inserted in the shared page
default location.
The shared page is now mapped in exec_map_stack, instead of
exec_new_vmspace. The latter function is called before image activator
has a chance to parse ASLR related flags.
The KERN_PROC_VM_LAYOUT sysctl was extended to provide shared page
address.
The feature is enabled by default for 64 bit applications on all
architectures.
It can be toggled kern.elf64.aslr.shared_page sysctl.

Approved by: mw(mentor)
Sponsored by: Stormshield
Obtained from: Semihalf
Reviewed by: kib
Differential Revision: https://reviews.freebsd.org/D35349

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