Remove "All Rights Reserved" from FreeBSD Foundation copyrights

These ones were unambiguous cases where the Foundation was the only
listed copyright holder.

Sponsored by: The FreeBSD Foundation

tests: Automated cleanup of cdefs and other formatting

Apply the following automated changes to try to eliminate
no-longer-needed sys/cdefs.h includes as well as now-empty
blank lines in a row.

Rem

tests: Automated cleanup of cdefs and other formatting

Apply the following automated changes to try to eliminate
no-longer-needed sys/cdefs.h includes as well as now-empty
blank lines in a row.

Remove /^#if.*\n#endif.*\n#include\s+<sys/cdefs.h>.*\n/
Remove /\n+#include\s+<sys/cdefs.h>.*\n+#if.*\n#endif.*\n+/
Remove /\n+#if.*\n#endif.*\n+/
Remove /^#if.*\n#endif.*\n/
Remove /\n+#include\s+<sys/cdefs.h>\n#include\s+<sys/types.h>/
Remove /\n+#include\s+<sys/cdefs.h>\n#include\s+<sys/param.h>/
Remove /\n+#include\s+<sys/cdefs.h>\n#include\s+<sys/capsicum.h>/

Sponsored by: Netflix

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Remove $FreeBSD$: one-line .c pattern

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

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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copyin tests: Use the KERN_PROC_VM_LAYOUT sysctl to fetch layout info

... rather than using the KERN_PROC_PS_STRINGS value to derive the top
of the user address space.

Reviewed by: kib
MFC after: 1

copyin tests: Use the KERN_PROC_VM_LAYOUT sysctl to fetch layout info

... rather than using the KERN_PROC_PS_STRINGS value to derive the top
of the user address space.

Reviewed by: kib
MFC after: 1 month
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D33708

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riscv: fix VM_MAXUSER_ADDRESS checks in asm routines

There are two issues with the checks against VM_MAXUSER_ADDRESS. First,
the comparison should consider the values as unsigned, otherwise
addresse

riscv: fix VM_MAXUSER_ADDRESS checks in asm routines

There are two issues with the checks against VM_MAXUSER_ADDRESS. First,
the comparison should consider the values as unsigned, otherwise
addresses with the high bit set will fail to branch. Second, the value
of VM_MAXUSER_ADDRESS is, by convention, one larger than the maximum
mappable user address and invalid itself. Thus, use the bgeu instruction
for these comparisons.

Add a regression test case for copyin(9).

PR: 257193
Reported by: Robert Morris <rtm@lcs.mit.edu>
Reviewed by: markj
Differential Revision: https://reviews.freebsd.org/D31209

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Initialize len to avoid ENOMEM from sysctl(3).

PR: 248933
Sponsored by: The FreeBSD Foundation

Fix kern_copyin test.

Main part is that kern_copyin on amd64 after LA57 should query the top
of UVA for correct operations. In fact it should started doing that
after the workaround for AMD bug with

Fix kern_copyin test.

Main part is that kern_copyin on amd64 after LA57 should query the top
of UVA for correct operations. In fact it should started doing that
after the workaround for AMD bug with IRET in the last user page was
fixed by reducing UVA by a page.

Also since we started calculating top of UVA, fix MIPS according to
the comment.

Reported by: lwhsu
PR: 248933
Reviewed by: alc, markj
Sponsored by: The FreeBSD Foundation
Differential revision: https://reviews.freebsd.org/D26312

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Revert r337929

FreeBSD's mkstemp sets the temporary file's permissions to 600, and has ever
since mkstemp was added in 1987. Coverity's warning is still relevant for
portable programs since OpenGro

Revert r337929

FreeBSD's mkstemp sets the temporary file's permissions to 600, and has ever
since mkstemp was added in 1987. Coverity's warning is still relevant for
portable programs since OpenGroup does not require that behavior, and POSIX
didn't until 2008. But none of these programs are portable.

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Fix Coverity warnings about mkstemp in tests

umask(2) should always be used prior to mkstemp(3) so the temporary file
won't be created with insecure permissions.

Reported by: Coverity
CID: 1331605

Fix Coverity warnings about mkstemp in tests

umask(2) should always be used prior to mkstemp(3) so the temporary file
won't be created with insecure permissions.

Reported by: Coverity
CID: 1331605 1347173 1375366 1339800 1331604 1296056 1296060
CID: 1296057 1296062
MFC after: 2 weeks

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Merge ^/head r307383 through r307735.

Fix comment. We have different VM layout on MIPS, so test is skipped.

Requested by: kib
Sponsored by: DARPA, AFRL
Sponsored by: HEIF5

Merge ^/head r306906 through r307382.

Skip test on MIPS as we don't have shared page implemented yet.

Sponsored by: DARPA, AFRL
Sponsored by: HEIF5

MFH r289384-r293170

Sponsored by: The FreeBSD Foundation

Catch up with head (r291075).

Merge from head

Merge from head

Sponsored by: Gandi.net

Add tests for the copyin(9) handling of illegal buffers.

Reviewed by: emaste, ngie
Sponsored by: The FreeBSD Foundation
Differential revision: https://reviews.freebsd.org/D3925