sys/kern/kern_exec.c, exec_*.c: Sprinkle SET_ERROR dtrace probes.

PR kern/58378: Kernel error code origination lacks dtrace probes

sys/kern/kern_exec.c, exec_*.c: Sort includes.

No functional change intended.

exec_elf: Sort auxv entries by value of types

No significant changes intended.
Just for slightly nicer output for gdb "info auxv".

kern/exec_elf.c: Get emul_netbsd from sys/proc.h.

Do not warn for ELF note for FDO packaging metadata
(https://systemd.io/COREDUMP_PACKAGE_METADATA/),
found in userland binaries of Fedora 36.

Remove a superfluous VOP_GETATTR() from elf_load_interp() and replace
the LK_EXCLUSIVE lock with a LK_SHARED lock.

The attributes requested were not used since Rev 1.25 of exec_elf32.c
from 1997/05/

Remove a superfluous VOP_GETATTR() from elf_load_interp() and replace
the LK_EXCLUSIVE lock with a LK_SHARED lock.

The attributes requested were not used since Rev 1.25 of exec_elf32.c
from 1997/05/08 when mycroft GCd the va_mode check.

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Tidy up the vnode locking around execve() on ELF images to acquire and
release the locks fewer times. Proposed on tech-kern a very long time go.

PR/54549: ng0: always initialize execname.

Don't set AT_SUN_EXECNAME if we don't have a fully resolved name.

deduplicate the elf auxv builder code, welcome to 8.99.43

ignore the ancient NetBSD emulation tag.

stsrt with an alignment of 1 (which means no alignment). From alnsn

Turn KASSERTS that check alignment which are user triggerable into errors.
From alnsn

CID/1427732: Don't dereference NULL execname if there is no emul_arg.
(there always is one in our emulations) from alnsn@

Store full executable path in p->p_path as discussed in tech-kern.
This means that the full executable path is always available.

- exec_elf.c: use p->path to set AT_SUN_EXECNAME, and since this is

Store full executable path in p->p_path as discussed in tech-kern.
This means that the full executable path is always available.

- exec_elf.c: use p->path to set AT_SUN_EXECNAME, and since this is
always set, do so unconditionally.
- kern_exec.c: simplify pathexec, use kmem_strfree where appropriate
and set p->p_path
- kern_exit.c: free p->p_path
- kern_fork.c: set p->p_path for the child.
- kern_proc.c: use p->p_path to return the executable pathname; the
NULL check for p->p_path, should be a KASSERT?
- exec.h: gc ep_path, it is not used anymore
- param.h: bump version, 'struct proc' size change

TODO:
1. reference count the path string, to save copy at fork and free
just before exec?
2. canonicalize the pathname by changing namei() to LOCKPARENT
vnode and then using getcwd() on the parent directory?

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Setting AT_BASE on static binaries breaks TLS because they assume that
it is 0, will fix it differently.

For static PIE set the interpreter address to be the entry offset so we
don't lose it.

Enhance verbosity of debug message for ELF magic mismatch

Print e_ident[EI_MAG3] (it was missed)
Print e_ident[EI_CLASS] as it is used do determine correct ELF magic.

No functional change for non-d

Enhance verbosity of debug message for ELF magic mismatch

Print e_ident[EI_MAG3] (it was missed)
Print e_ident[EI_CLASS] as it is used do determine correct ELF magic.

No functional change for non-debug (without option DEBUG_ELF) build.

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obey the executable's ELF alignment constraints for PIE.
this fixes gdb of PIE binaries on mac68k (and other platforms
which use an ELF alignment that is larger than PAGE_SIZE).

netbsd_elf_signature - look at note segments (phdrs) not note
sections. They point to the same data in the file, but sections are
for linkers and are not necessarily present in an executable.

The o

netbsd_elf_signature - look at note segments (phdrs) not note
sections. They point to the same data in the file, but sections are
for linkers and are not necessarily present in an executable.

The original switch from phdrs to shdrs seems to be just a cop-out to
avoid parsing multiple notes per segment, which doesn't really avoid
the problem b/c sections also can contain multiple notes.

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oops removed too much

Add debugging.

randomize the location of the rtld.

reduce #ifdef mess caused by PaX

Move all the randomization inside kern_pax.c so we can control it directly.
Add debugging flags to be able to set the random number externally.