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/*-
* Copyright (c) 2015 Nuxi, https://nuxi.nl/
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/imgact.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/proc.h>
#include <sys/smp.h>
#include <sys/sysctl.h>
#include <sys/sysent.h>
#include <sys/systm.h>
#include <contrib/cloudabi/cloudabi64_types.h>
#include <compat/cloudabi/cloudabi_util.h>
#include <compat/cloudabi64/cloudabi64_util.h>
extern char _binary_cloudabi64_vdso_o_start[];
extern char _binary_cloudabi64_vdso_o_end[];
register_t *
cloudabi64_copyout_strings(struct image_params *imgp)
{
struct image_args *args;
uintptr_t begin;
size_t len;
/* Copy out program arguments. */
args = imgp->args;
len = exec_args_get_begin_envv(args) - args->begin_argv;
begin = rounddown2(imgp->sysent->sv_usrstack - len, sizeof(register_t));
copyout(args->begin_argv, (void *)begin, len);
return ((register_t *)begin);
}
int
cloudabi64_fixup(register_t **stack_base, struct image_params *imgp)
{
char canarybuf[64], pidbuf[16];
Elf64_Auxargs *args;
struct thread *td;
void *argdata, *canary, *pid;
size_t argdatalen;
int error;
/*
* CloudABI executables do not store the FreeBSD OS release
* number in their header. Set the OS release number to the
* latest version of FreeBSD, so that system calls behave as if
* called natively.
*/
td = curthread;
td->td_proc->p_osrel = __FreeBSD_version;
argdata = *stack_base;
/* Store canary for stack smashing protection. */
arc4rand(canarybuf, sizeof(canarybuf), 0);
*stack_base -= howmany(sizeof(canarybuf), sizeof(register_t));
canary = *stack_base;
error = copyout(canarybuf, canary, sizeof(canarybuf));
if (error != 0)
return (error);
/*
* Generate a random UUID that identifies the process. Right now
* we don't store this UUID in the kernel. Ideally, it should be
* exposed through ps(1).
*/
arc4rand(pidbuf, sizeof(pidbuf), 0);
pidbuf[6] = (pidbuf[6] & 0x0f) | 0x40;
pidbuf[8] = (pidbuf[8] & 0x3f) | 0x80;
*stack_base -= howmany(sizeof(pidbuf), sizeof(register_t));
pid = *stack_base;
error = copyout(pidbuf, pid, sizeof(pidbuf));
if (error != 0)
return (error);
/*
* Compute length of program arguments. As the argument data is
* binary safe, we had to add a trailing null byte in
* exec_copyin_data_fds(). Undo this by reducing the length.
*/
args = (Elf64_Auxargs *)imgp->auxargs;
argdatalen = exec_args_get_begin_envv(imgp->args) -
imgp->args->begin_argv;
if (argdatalen > 0)
--argdatalen;
/* Write out an auxiliary vector. */
cloudabi64_auxv_t auxv[] = {
#define VAL(type, val) { .a_type = (type), .a_val = (val) }
#define PTR(type, ptr) { .a_type = (type), .a_ptr = (uintptr_t)(ptr) }
PTR(CLOUDABI_AT_ARGDATA, argdata),
VAL(CLOUDABI_AT_ARGDATALEN, argdatalen),
VAL(CLOUDABI_AT_BASE, args->base),
PTR(CLOUDABI_AT_CANARY, canary),
VAL(CLOUDABI_AT_CANARYLEN, sizeof(canarybuf)),
VAL(CLOUDABI_AT_NCPUS, mp_ncpus),
VAL(CLOUDABI_AT_PAGESZ, args->pagesz),
PTR(CLOUDABI_AT_PHDR, args->phdr),
VAL(CLOUDABI_AT_PHNUM, args->phnum),
PTR(CLOUDABI_AT_PID, pid),
PTR(CLOUDABI_AT_SYSINFO_EHDR,
imgp->proc->p_sysent->sv_shared_page_base),
VAL(CLOUDABI_AT_TID, td->td_tid),
#undef VAL
#undef PTR
{ .a_type = CLOUDABI_AT_NULL },
};
*stack_base -= howmany(sizeof(auxv), sizeof(register_t));
error = copyout(auxv, *stack_base, sizeof(auxv));
if (error != 0)
return (error);
/* Reserve space for storing the TCB. */
*stack_base -= howmany(sizeof(cloudabi64_tcb_t), sizeof(register_t));
return (0);
}
static int
cloudabi64_modevent(module_t mod, int type, void *data)
{
switch (type) {
case MOD_LOAD:
cloudabi_vdso_init(cloudabi64_brand.sysvec,
_binary_cloudabi64_vdso_o_start,
_binary_cloudabi64_vdso_o_end);
if (elf64_insert_brand_entry(&cloudabi64_brand) < 0) {
printf("Failed to add CloudABI ELF brand handler\n");
return (EINVAL);
}
return (0);
case MOD_UNLOAD:
if (elf64_brand_inuse(&cloudabi64_brand))
return (EBUSY);
if (elf64_remove_brand_entry(&cloudabi64_brand) < 0) {
printf("Failed to remove CloudABI ELF brand handler\n");
return (EINVAL);
}
cloudabi_vdso_destroy(cloudabi64_brand.sysvec);
return (0);
default:
return (EOPNOTSUPP);
}
}
static moduledata_t cloudabi64_module = {
"cloudabi64",
cloudabi64_modevent,
NULL
};
DECLARE_MODULE_TIED(cloudabi64, cloudabi64_module, SI_SUB_EXEC, SI_ORDER_ANY);
MODULE_DEPEND(cloudabi64, cloudabi, 1, 1, 1);
FEATURE(cloudabi64, "CloudABI 64bit support");
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