KNF consistency: No parentheses are needed around the return value.

The way the kernel tries to prevent a userland process from allocating page
zero is hugely flawed. It is easy to demonstrate that one can trick UVM
into chosing a NULL hint after the user_va0_disable

The way the kernel tries to prevent a userland process from allocating page
zero is hugely flawed. It is easy to demonstrate that one can trick UVM
into chosing a NULL hint after the user_va0_disable check from uvm_map.
Such a bypass allows kernel NULL pointer dereferences to be exploitable on
architectures with a shared userland<->kernel VA, like amd64.

Fix this by increasing the limit of the vm space made available for
userland processes. This way, UVM will never chose a NULL hint, since it
would be outside of the vm space.

The user_va0_disable sysctl still controls this feature.

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Add compatibility for pre MIDMAGIC a.out binaries (with COMPAT_NOMID)
Oldzmagic binaries need "sysctl -w vm.user_va0_disable=0"

remove unused prototypes

Clear the VM_TOPDOWN flag only when we succeed.

a.out binaries can't handle topdown.
Now 1.0 binaries work correctly on NetBSD-current.

Replace M_IOV and some malloc(9)s with kmem(9), and while there:
- Fix invalid free (M_TEMP vs M_IOV) in do_sys_recvmsg(), spotted by jakllsch@.
Also, same fix in osf1_sys_sendmsg_xopen().
- Fix at

Replace M_IOV and some malloc(9)s with kmem(9), and while there:
- Fix invalid free (M_TEMP vs M_IOV) in do_sys_recvmsg(), spotted by jakllsch@.
Also, same fix in osf1_sys_sendmsg_xopen().
- Fix attempt to free non-allocated memory in error path in netbsd32___getfh30().
- Plug a memory leak in compat_43_netbsd32_orecvmsg().

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remove clause #3 from my license where there are no other
copyright holders involved.

ANSIfy most of the function definitions in sys/compat (but not ndis).
All by the magic of sed ...

Remove all the __P

merge ktrace-lwp.

nuke trailing whitespace

did this ever work? The EXEC_32 flag must be set _before_
exec_aout_prep_*magic(), otherwise setup_stack() fails.

-MID_SPARC->NETBSD32_MID_MACHINE
-check for zero BSS size, as in kern/exec_aout.c rev. 1.23

Move Matt Green's code from a 4-clause to a 3-clause licence by removing
the advertising clause. Diffs provided in PR 22396 by Joel Baker, the changes
were confirmed to the board by Matt Green.

- GC all the setup_stack functions
- add one for linux/i386

Back out the lwp/ktrace changes. They contained a lot of colateral damage,
and need to be examined and discussed more.

Pass lwp pointers throughtout the kernel, as required, so that the lwpid can
be inserted into ktrace records. The general change has been to replace
"struct proc *" with "struct lwp *" in various fu

Pass lwp pointers throughtout the kernel, as required, so that the lwpid can
be inserted into ktrace records. The general change has been to replace
"struct proc *" with "struct lwp *" in various function prototypes, pass
the lwp through and use l_proc to get the process pointer when needed.

Bump the kernel rev up to 1.6V

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Use PAGE_SIZE rather than NBPG.

Rename __LDPGSZ to AOUT_LDPGSZ, to accurately reflect what it is.

Use __LDPGSZ (which must be == USRTEXT) as the text address for a.out
executables, and eliminate the USRTEXT constant, which was only used
by the a.out exec code.

count executable image pages as executable for vm-usage purposes.
also, always do the VTEXT vs. v_writecount mutual exclusion
(which we previously skipped if the text or data segment was empty).

remove trailing \n in panic(). approved perry.

add RCSIDs (including regeneration of files as appropriate)

- Add a new vnode flag VEXECMAP, which indicates that a vnode has
executable mappings. Stop overloading VTEXT for this purpose (VTEXT
also has another meaning).
- Rename vn_marktext() to vn_mark

- Add a new vnode flag VEXECMAP, which indicates that a vnode has
executable mappings. Stop overloading VTEXT for this purpose (VTEXT
also has another meaning).
- Rename vn_marktext() to vn_markexec(), and use it when executable
mappings of a vnode are established.
- In places where we want to set VTEXT, set it in v_flag directly, rather
than making a function call to do this (it no longer makes sense to
use a function call, since we no longer overload VTEXT with VEXECMAP's
meaning).

VEXECMAP suggested by Chuq Silvers.

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