783 lines
20 KiB
C
783 lines
20 KiB
C
/*-
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* Copyright (c) 2013-16, Stacey D. Son
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#include <sys/param.h>
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#include <sys/ctype.h>
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#include <sys/exec.h>
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#include <sys/fcntl.h>
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#include <sys/imgact.h>
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#include <sys/imgact_binmisc.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/mutex.h>
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#include <sys/namei.h>
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#include <sys/sbuf.h>
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#include <sys/sysctl.h>
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#include <sys/sx.h>
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#include <sys/vnode.h>
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#include <machine/atomic.h>
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/**
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* Miscellaneous binary interpreter image activator.
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*
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* If the given target executable's header matches 'xbe_magic' field in the
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* 'interpreter_list' then it will use the user-level interpreter specified in
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* the 'xbe_interpreter' field to execute the binary. The 'xbe_magic' field may
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* be adjusted to a given offset using the value in the 'xbe_moffset' field
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* and bits of the header may be masked using the 'xbe_mask' field. The
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* 'interpreter_list' entries are managed using sysctl(3) as described in the
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* <sys/imgact_binmisc.h> file.
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*/
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/*
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* Node of the interpreter list.
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*/
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typedef struct imgact_binmisc_entry {
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SLIST_ENTRY(imgact_binmisc_entry) link;
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char *ibe_name;
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uint8_t *ibe_magic;
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uint8_t *ibe_mask;
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uint8_t *ibe_interpreter;
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struct vnode *ibe_interpreter_vnode;
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ssize_t ibe_interp_offset;
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uint32_t ibe_interp_argcnt;
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uint32_t ibe_interp_length;
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uint32_t ibe_argv0_cnt;
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uint32_t ibe_flags;
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uint32_t ibe_moffset;
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uint32_t ibe_msize;
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} imgact_binmisc_entry_t;
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/*
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* sysctl() commands.
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*/
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#define IBC_ADD 1 /* Add given entry. */
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#define IBC_REMOVE 2 /* Remove entry for a given name. */
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#define IBC_DISABLE 3 /* Disable entry for a given name. */
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#define IBC_ENABLE 4 /* Enable entry for a given name. */
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#define IBC_LOOKUP 5 /* Lookup and return entry for given name. */
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#define IBC_LIST 6 /* Get a snapshot of the interpretor list. */
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/*
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* Interpreter string macros.
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*
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* They all start with '#' followed by a single letter:
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*/
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#define ISM_POUND '#' /* "##" is the escape sequence for single #. */
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#define ISM_OLD_ARGV0 'a' /* "#a" is replaced with the old argv0. */
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MALLOC_DEFINE(M_BINMISC, KMOD_NAME, "misc binary image activator");
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/* The interpreter list. */
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static SLIST_HEAD(, imgact_binmisc_entry) interpreter_list =
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SLIST_HEAD_INITIALIZER(interpreter_list);
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static int interp_list_entry_count;
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static struct sx interp_list_sx;
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#define INTERP_LIST_WLOCK() sx_xlock(&interp_list_sx)
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#define INTERP_LIST_RLOCK() sx_slock(&interp_list_sx)
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#define INTERP_LIST_WUNLOCK() sx_xunlock(&interp_list_sx)
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#define INTERP_LIST_RUNLOCK() sx_sunlock(&interp_list_sx)
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#define INTERP_LIST_LOCK_INIT() sx_init(&interp_list_sx, KMOD_NAME)
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#define INTERP_LIST_LOCK_DESTROY() sx_destroy(&interp_list_sx)
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#define INTERP_LIST_ASSERT_LOCKED() sx_assert(&interp_list_sx, SA_LOCKED)
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/*
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* Populate the entry with the information about the interpreter.
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*/
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static void
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imgact_binmisc_populate_interp(char *str, imgact_binmisc_entry_t *ibe, int flags)
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{
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uint32_t len = 0, argc = 1;
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char t[IBE_INTERP_LEN_MAX];
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char *sp, *tp;
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memset(t, 0, sizeof(t));
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/*
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* Normalize interpreter string. Replace white space between args with
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* single space.
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*/
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sp = str; tp = t;
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while (*sp != '\0') {
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if (*sp == ' ' || *sp == '\t') {
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if (++len >= IBE_INTERP_LEN_MAX)
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break;
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*tp++ = ' ';
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argc++;
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while (*sp == ' ' || *sp == '\t')
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sp++;
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continue;
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} else {
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*tp++ = *sp++;
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len++;
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}
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}
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*tp = '\0';
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len++;
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ibe->ibe_interpreter = malloc(len, M_BINMISC, M_WAITOK|M_ZERO);
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/* Populate all the ibe fields for the interpreter. */
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memcpy(ibe->ibe_interpreter, t, len);
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ibe->ibe_interp_argcnt = argc;
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ibe->ibe_interp_length = len;
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ibe->ibe_interpreter_vnode = NULL;
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if (flags & IBF_PRE_OPEN) {
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struct nameidata nd;
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int error;
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tp = t;
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while (*tp != '\0' && *tp != ' ') {
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tp++;
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}
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*tp = '\0';
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NDINIT(&nd, LOOKUP, FOLLOW | ISOPEN, UIO_SYSSPACE, t);
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/*
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* If there is an error, just stop now and fall back
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* to the non pre-open case where we lookup during
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* exec.
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*/
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error = namei(&nd);
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if (error)
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return;
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ibe->ibe_interpreter_vnode = nd.ni_vp;
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}
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}
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/*
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* Allocate memory and populate a new entry for the interpreter table.
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*/
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static imgact_binmisc_entry_t *
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imgact_binmisc_new_entry(ximgact_binmisc_entry_t *xbe, ssize_t interp_offset,
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int argv0_cnt)
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{
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imgact_binmisc_entry_t *ibe = NULL;
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size_t namesz = min(strlen(xbe->xbe_name) + 1, IBE_NAME_MAX);
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ibe = malloc(sizeof(*ibe), M_BINMISC, M_WAITOK|M_ZERO);
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ibe->ibe_name = malloc(namesz, M_BINMISC, M_WAITOK|M_ZERO);
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strlcpy(ibe->ibe_name, xbe->xbe_name, namesz);
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imgact_binmisc_populate_interp(xbe->xbe_interpreter, ibe, xbe->xbe_flags);
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ibe->ibe_magic = malloc(xbe->xbe_msize, M_BINMISC, M_WAITOK|M_ZERO);
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memcpy(ibe->ibe_magic, xbe->xbe_magic, xbe->xbe_msize);
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ibe->ibe_mask = malloc(xbe->xbe_msize, M_BINMISC, M_WAITOK|M_ZERO);
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memcpy(ibe->ibe_mask, xbe->xbe_mask, xbe->xbe_msize);
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ibe->ibe_moffset = xbe->xbe_moffset;
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ibe->ibe_msize = xbe->xbe_msize;
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ibe->ibe_flags = xbe->xbe_flags;
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ibe->ibe_interp_offset = interp_offset;
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ibe->ibe_argv0_cnt = argv0_cnt;
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return (ibe);
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}
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/*
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* Free the allocated memory for a given list item.
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*/
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static void
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imgact_binmisc_destroy_entry(imgact_binmisc_entry_t *ibe)
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{
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if (!ibe)
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return;
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if (ibe->ibe_magic)
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free(ibe->ibe_magic, M_BINMISC);
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if (ibe->ibe_mask)
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free(ibe->ibe_mask, M_BINMISC);
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if (ibe->ibe_interpreter)
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free(ibe->ibe_interpreter, M_BINMISC);
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if (ibe->ibe_name)
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free(ibe->ibe_name, M_BINMISC);
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if (ibe->ibe_interpreter_vnode)
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vrele(ibe->ibe_interpreter_vnode);
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if (ibe)
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free(ibe, M_BINMISC);
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}
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/*
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* Find the interpreter in the list by the given name. Return NULL if not
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* found.
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*/
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static imgact_binmisc_entry_t *
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imgact_binmisc_find_entry(char *name)
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{
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imgact_binmisc_entry_t *ibe;
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INTERP_LIST_ASSERT_LOCKED();
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SLIST_FOREACH(ibe, &interpreter_list, link) {
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if (strncmp(name, ibe->ibe_name, IBE_NAME_MAX) == 0)
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return (ibe);
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}
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return (NULL);
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}
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/*
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* Add the given interpreter if it doesn't already exist. Return EEXIST
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* if the name already exist in the interpreter list.
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*/
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static int
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imgact_binmisc_add_entry(ximgact_binmisc_entry_t *xbe)
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{
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imgact_binmisc_entry_t *ibe;
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char *p;
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ssize_t interp_offset;
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int argv0_cnt, cnt;
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if (xbe->xbe_msize > IBE_MAGIC_MAX)
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return (EINVAL);
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if (xbe->xbe_moffset + xbe->xbe_msize > IBE_MATCH_MAX)
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return (EINVAL);
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for(cnt = 0, p = xbe->xbe_name; *p != 0; cnt++, p++)
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if (cnt >= IBE_NAME_MAX || !isascii((int)*p))
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return (EINVAL);
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for(cnt = 0, p = xbe->xbe_interpreter; *p != 0; cnt++, p++)
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if (cnt >= IBE_INTERP_LEN_MAX || !isascii((int)*p))
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return (EINVAL);
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/* Make sure we don't have any invalid #'s. */
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p = xbe->xbe_interpreter;
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interp_offset = 0;
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argv0_cnt = 0;
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while ((p = strchr(p, '#')) != NULL) {
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p++;
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switch(*p) {
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case ISM_POUND:
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/* "##" */
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p++;
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interp_offset--;
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break;
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case ISM_OLD_ARGV0:
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/* "#a" */
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p++;
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argv0_cnt++;
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break;
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case 0:
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default:
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/* Anything besides the above is invalid. */
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return (EINVAL);
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}
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}
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/*
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* Preallocate a new entry. We do this without holding the
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* lock to avoid lock-order problems if IBF_PRE_OPEN is
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* set.
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*/
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ibe = imgact_binmisc_new_entry(xbe, interp_offset, argv0_cnt);
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INTERP_LIST_WLOCK();
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if (imgact_binmisc_find_entry(xbe->xbe_name) != NULL) {
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INTERP_LIST_WUNLOCK();
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imgact_binmisc_destroy_entry(ibe);
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return (EEXIST);
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}
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SLIST_INSERT_HEAD(&interpreter_list, ibe, link);
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interp_list_entry_count++;
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INTERP_LIST_WUNLOCK();
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return (0);
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}
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/*
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* Remove the interpreter in the list with the given name. Return ENOENT
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* if not found.
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*/
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static int
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imgact_binmisc_remove_entry(char *name)
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{
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imgact_binmisc_entry_t *ibe;
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INTERP_LIST_WLOCK();
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if ((ibe = imgact_binmisc_find_entry(name)) == NULL) {
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INTERP_LIST_WUNLOCK();
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return (ENOENT);
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}
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SLIST_REMOVE(&interpreter_list, ibe, imgact_binmisc_entry, link);
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interp_list_entry_count--;
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INTERP_LIST_WUNLOCK();
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imgact_binmisc_destroy_entry(ibe);
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return (0);
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}
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/*
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* Disable the interpreter in the list with the given name. Return ENOENT
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* if not found.
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*/
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static int
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imgact_binmisc_disable_entry(char *name)
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{
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imgact_binmisc_entry_t *ibe;
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INTERP_LIST_WLOCK();
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if ((ibe = imgact_binmisc_find_entry(name)) == NULL) {
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INTERP_LIST_WUNLOCK();
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return (ENOENT);
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}
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ibe->ibe_flags &= ~IBF_ENABLED;
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INTERP_LIST_WUNLOCK();
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return (0);
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}
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/*
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* Enable the interpreter in the list with the given name. Return ENOENT
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* if not found.
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*/
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static int
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imgact_binmisc_enable_entry(char *name)
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{
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imgact_binmisc_entry_t *ibe;
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INTERP_LIST_WLOCK();
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if ((ibe = imgact_binmisc_find_entry(name)) == NULL) {
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INTERP_LIST_WUNLOCK();
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return (ENOENT);
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}
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ibe->ibe_flags |= IBF_ENABLED;
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INTERP_LIST_WUNLOCK();
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return (0);
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}
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static int
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imgact_binmisc_populate_xbe(ximgact_binmisc_entry_t *xbe,
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imgact_binmisc_entry_t *ibe)
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{
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uint32_t i;
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INTERP_LIST_ASSERT_LOCKED();
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memset(xbe, 0, sizeof(*xbe));
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strlcpy(xbe->xbe_name, ibe->ibe_name, IBE_NAME_MAX);
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/* Copy interpreter string. Replace NULL breaks with space. */
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memcpy(xbe->xbe_interpreter, ibe->ibe_interpreter,
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ibe->ibe_interp_length);
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for(i = 0; i < (ibe->ibe_interp_length - 1); i++)
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if (xbe->xbe_interpreter[i] == '\0')
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xbe->xbe_interpreter[i] = ' ';
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memcpy(xbe->xbe_magic, ibe->ibe_magic, ibe->ibe_msize);
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memcpy(xbe->xbe_mask, ibe->ibe_mask, ibe->ibe_msize);
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xbe->xbe_version = IBE_VERSION;
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xbe->xbe_flags = ibe->ibe_flags;
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xbe->xbe_moffset = ibe->ibe_moffset;
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xbe->xbe_msize = ibe->ibe_msize;
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return (0);
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}
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/*
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* Retrieve the interpreter with the give name and populate the
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* ximgact_binmisc_entry structure. Return ENOENT if not found.
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*/
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static int
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imgact_binmisc_lookup_entry(char *name, ximgact_binmisc_entry_t *xbe)
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{
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imgact_binmisc_entry_t *ibe;
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int error = 0;
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INTERP_LIST_RLOCK();
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if ((ibe = imgact_binmisc_find_entry(name)) == NULL) {
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INTERP_LIST_RUNLOCK();
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return (ENOENT);
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}
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error = imgact_binmisc_populate_xbe(xbe, ibe);
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INTERP_LIST_RUNLOCK();
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return (error);
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}
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/*
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* Get a snapshot of all the interpreter entries in the list.
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*/
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static int
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imgact_binmisc_get_all_entries(struct sysctl_req *req)
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{
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ximgact_binmisc_entry_t *xbe, *xbep;
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imgact_binmisc_entry_t *ibe;
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int error = 0, count;
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INTERP_LIST_RLOCK();
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count = interp_list_entry_count;
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xbe = malloc(sizeof(*xbe) * count, M_BINMISC, M_WAITOK|M_ZERO);
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xbep = xbe;
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SLIST_FOREACH(ibe, &interpreter_list, link) {
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error = imgact_binmisc_populate_xbe(xbep++, ibe);
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if (error)
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break;
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}
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INTERP_LIST_RUNLOCK();
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if (!error)
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error = SYSCTL_OUT(req, xbe, sizeof(*xbe) * count);
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free(xbe, M_BINMISC);
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return (error);
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}
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/*
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* sysctl() handler for munipulating interpretor table.
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* Not MP safe (locked by sysctl).
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*/
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static int
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sysctl_kern_binmisc(SYSCTL_HANDLER_ARGS)
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{
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ximgact_binmisc_entry_t xbe;
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int error = 0;
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switch(arg2) {
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case IBC_ADD:
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/* Add an entry. Limited to IBE_MAX_ENTRIES. */
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error = SYSCTL_IN(req, &xbe, sizeof(xbe));
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if (error)
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return (error);
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if (IBE_VERSION != xbe.xbe_version)
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return (EINVAL);
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if ((xbe.xbe_flags & ~IBF_VALID_UFLAGS) != 0)
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return (EINVAL);
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if (interp_list_entry_count == IBE_MAX_ENTRIES)
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return (ENOSPC);
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error = imgact_binmisc_add_entry(&xbe);
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break;
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case IBC_REMOVE:
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/* Remove an entry. */
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error = SYSCTL_IN(req, &xbe, sizeof(xbe));
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if (error)
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return (error);
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if (IBE_VERSION != xbe.xbe_version)
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return (EINVAL);
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error = imgact_binmisc_remove_entry(xbe.xbe_name);
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break;
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case IBC_DISABLE:
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/* Disable an entry. */
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error = SYSCTL_IN(req, &xbe, sizeof(xbe));
|
|
if (error)
|
|
return (error);
|
|
if (IBE_VERSION != xbe.xbe_version)
|
|
return (EINVAL);
|
|
error = imgact_binmisc_disable_entry(xbe.xbe_name);
|
|
break;
|
|
|
|
case IBC_ENABLE:
|
|
/* Enable an entry. */
|
|
error = SYSCTL_IN(req, &xbe, sizeof(xbe));
|
|
if (error)
|
|
return (error);
|
|
if (IBE_VERSION != xbe.xbe_version)
|
|
return (EINVAL);
|
|
error = imgact_binmisc_enable_entry(xbe.xbe_name);
|
|
break;
|
|
|
|
case IBC_LOOKUP:
|
|
/* Lookup an entry. */
|
|
error = SYSCTL_IN(req, &xbe, sizeof(xbe));
|
|
if (error)
|
|
return (error);
|
|
if (IBE_VERSION != xbe.xbe_version)
|
|
return (EINVAL);
|
|
error = imgact_binmisc_lookup_entry(xbe.xbe_name, &xbe);
|
|
if (!error)
|
|
error = SYSCTL_OUT(req, &xbe, sizeof(xbe));
|
|
break;
|
|
|
|
case IBC_LIST:
|
|
/* Return a snapshot of the interpretor list. */
|
|
|
|
if (!req->oldptr) {
|
|
/* No pointer then just return the list size. */
|
|
error = SYSCTL_OUT(req, 0, interp_list_entry_count *
|
|
sizeof(ximgact_binmisc_entry_t));
|
|
return (error);
|
|
} else
|
|
if (!req->oldlen)
|
|
return (EINVAL);
|
|
|
|
error = imgact_binmisc_get_all_entries(req);
|
|
break;
|
|
|
|
default:
|
|
return (EINVAL);
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
|
|
SYSCTL_NODE(_kern, OID_AUTO, binmisc, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
|
|
"Image activator for miscellaneous binaries");
|
|
|
|
SYSCTL_PROC(_kern_binmisc, OID_AUTO, add,
|
|
CTLFLAG_MPSAFE|CTLTYPE_STRUCT|CTLFLAG_WR, NULL, IBC_ADD,
|
|
sysctl_kern_binmisc, "S,ximgact_binmisc_entry",
|
|
"Add an activator entry");
|
|
|
|
SYSCTL_PROC(_kern_binmisc, OID_AUTO, remove,
|
|
CTLFLAG_MPSAFE|CTLTYPE_STRUCT|CTLFLAG_WR, NULL, IBC_REMOVE,
|
|
sysctl_kern_binmisc, "S,ximgact_binmisc_entry",
|
|
"Remove an activator entry");
|
|
|
|
SYSCTL_PROC(_kern_binmisc, OID_AUTO, disable,
|
|
CTLFLAG_MPSAFE|CTLTYPE_STRUCT|CTLFLAG_WR, NULL, IBC_DISABLE,
|
|
sysctl_kern_binmisc, "S,ximgact_binmisc_entry",
|
|
"Disable an activator entry");
|
|
|
|
SYSCTL_PROC(_kern_binmisc, OID_AUTO, enable,
|
|
CTLFLAG_MPSAFE|CTLTYPE_STRUCT|CTLFLAG_WR, NULL, IBC_ENABLE,
|
|
sysctl_kern_binmisc, "S,ximgact_binmisc_entry",
|
|
"Enable an activator entry");
|
|
|
|
SYSCTL_PROC(_kern_binmisc, OID_AUTO, lookup,
|
|
CTLFLAG_MPSAFE|CTLTYPE_STRUCT|CTLFLAG_RW|CTLFLAG_ANYBODY, NULL, IBC_LOOKUP,
|
|
sysctl_kern_binmisc, "S,ximgact_binmisc_entry",
|
|
"Lookup an activator entry");
|
|
|
|
SYSCTL_PROC(_kern_binmisc, OID_AUTO, list,
|
|
CTLFLAG_MPSAFE|CTLTYPE_STRUCT|CTLFLAG_RD|CTLFLAG_ANYBODY, NULL, IBC_LIST,
|
|
sysctl_kern_binmisc, "S,ximgact_binmisc_entry",
|
|
"Get snapshot of all the activator entries");
|
|
|
|
static imgact_binmisc_entry_t *
|
|
imgact_binmisc_find_interpreter(const char *image_header)
|
|
{
|
|
imgact_binmisc_entry_t *ibe;
|
|
const char *p;
|
|
int i;
|
|
size_t sz;
|
|
|
|
INTERP_LIST_ASSERT_LOCKED();
|
|
|
|
SLIST_FOREACH(ibe, &interpreter_list, link) {
|
|
if (!(IBF_ENABLED & ibe->ibe_flags))
|
|
continue;
|
|
|
|
p = image_header + ibe->ibe_moffset;
|
|
sz = ibe->ibe_msize;
|
|
if (IBF_USE_MASK & ibe->ibe_flags) {
|
|
/* Compare using mask. */
|
|
for (i = 0; i < sz; i++)
|
|
if ((*p++ ^ ibe->ibe_magic[i]) &
|
|
ibe->ibe_mask[i])
|
|
break;
|
|
} else {
|
|
for (i = 0; i < sz; i++)
|
|
if (*p++ ^ ibe->ibe_magic[i])
|
|
break;
|
|
}
|
|
if (i == ibe->ibe_msize)
|
|
return (ibe);
|
|
}
|
|
return (NULL);
|
|
}
|
|
|
|
static int
|
|
imgact_binmisc_exec(struct image_params *imgp)
|
|
{
|
|
const char *image_header = imgp->image_header;
|
|
const char *fname = NULL;
|
|
int error = 0;
|
|
#ifdef INVARIANTS
|
|
int argv0_cnt = 0;
|
|
#endif
|
|
size_t namelen, offset;
|
|
imgact_binmisc_entry_t *ibe;
|
|
struct sbuf *sname;
|
|
char *s, *d;
|
|
|
|
sname = NULL;
|
|
namelen = 0;
|
|
/* Do we have an interpreter for the given image header? */
|
|
INTERP_LIST_RLOCK();
|
|
if ((ibe = imgact_binmisc_find_interpreter(image_header)) == NULL) {
|
|
error = -1;
|
|
goto done;
|
|
}
|
|
|
|
/* No interpreter nesting allowed. */
|
|
if (imgp->interpreted & IMGACT_BINMISC) {
|
|
error = ENOEXEC;
|
|
goto done;
|
|
}
|
|
|
|
imgp->interpreted |= IMGACT_BINMISC;
|
|
|
|
/*
|
|
* Don't bother with the overhead of putting fname together if we're not
|
|
* using #a.
|
|
*/
|
|
if (ibe->ibe_argv0_cnt != 0) {
|
|
if (imgp->args->fname != NULL) {
|
|
fname = imgp->args->fname;
|
|
} else {
|
|
/* Use the fdescfs(5) path for fexecve(2). */
|
|
sname = sbuf_new_auto();
|
|
sbuf_printf(sname, "/dev/fd/%d", imgp->args->fd);
|
|
sbuf_finish(sname);
|
|
fname = sbuf_data(sname);
|
|
}
|
|
|
|
namelen = strlen(fname);
|
|
}
|
|
|
|
/*
|
|
* We need to "push" the interpreter in the arg[] list. To do this,
|
|
* we first shift all the other values in the `begin_argv' area to
|
|
* provide the exact amount of room for the values added. Set up
|
|
* `offset' as the number of bytes to be added to the `begin_argv'
|
|
* area. ibe_interp_offset is the fixed offset from macros present in
|
|
* the interpreter string.
|
|
*/
|
|
offset = ibe->ibe_interp_length + ibe->ibe_interp_offset;
|
|
|
|
/* Variable offset to be added from macros to the interpreter string. */
|
|
MPASS(ibe->ibe_argv0_cnt == 0 || namelen > 0);
|
|
offset += ibe->ibe_argv0_cnt * (namelen - 2);
|
|
|
|
/* Make room for the interpreter */
|
|
error = exec_args_adjust_args(imgp->args, 0, offset);
|
|
if (error != 0) {
|
|
goto done;
|
|
}
|
|
|
|
/* Add the new argument(s) in the count. */
|
|
imgp->args->argc += ibe->ibe_interp_argcnt;
|
|
|
|
/*
|
|
* The original arg[] list has been shifted appropriately. Copy in
|
|
* the interpreter path.
|
|
*/
|
|
s = ibe->ibe_interpreter;
|
|
d = imgp->args->begin_argv;
|
|
while(*s != '\0') {
|
|
switch (*s) {
|
|
case '#':
|
|
/* Handle "#" in interpreter string. */
|
|
s++;
|
|
switch(*s) {
|
|
case ISM_POUND:
|
|
/* "##": Replace with a single '#' */
|
|
*d++ = '#';
|
|
break;
|
|
case ISM_OLD_ARGV0:
|
|
/* "#a": Replace with old arg0 (fname). */
|
|
MPASS(ibe->ibe_argv0_cnt >= ++argv0_cnt);
|
|
memcpy(d, fname, namelen);
|
|
d += namelen;
|
|
break;
|
|
default:
|
|
__assert_unreachable();
|
|
}
|
|
break;
|
|
case ' ':
|
|
/* Replace space with NUL to separate arguments. */
|
|
*d++ = '\0';
|
|
break;
|
|
default:
|
|
*d++ = *s;
|
|
break;
|
|
}
|
|
s++;
|
|
}
|
|
*d = '\0';
|
|
|
|
/* Catch ibe->ibe_argv0_cnt counting more #a than we did. */
|
|
MPASS(ibe->ibe_argv0_cnt == argv0_cnt);
|
|
imgp->interpreter_name = imgp->args->begin_argv;
|
|
if (ibe->ibe_interpreter_vnode) {
|
|
imgp->interpreter_vp = ibe->ibe_interpreter_vnode;
|
|
vref(imgp->interpreter_vp);
|
|
}
|
|
|
|
done:
|
|
INTERP_LIST_RUNLOCK();
|
|
if (sname)
|
|
sbuf_delete(sname);
|
|
return (error);
|
|
}
|
|
|
|
static void
|
|
imgact_binmisc_init(void *arg)
|
|
{
|
|
|
|
INTERP_LIST_LOCK_INIT();
|
|
}
|
|
|
|
static void
|
|
imgact_binmisc_fini(void *arg)
|
|
{
|
|
imgact_binmisc_entry_t *ibe, *ibe_tmp;
|
|
|
|
/* Free all the interpreters. */
|
|
INTERP_LIST_WLOCK();
|
|
SLIST_FOREACH_SAFE(ibe, &interpreter_list, link, ibe_tmp) {
|
|
SLIST_REMOVE(&interpreter_list, ibe, imgact_binmisc_entry,
|
|
link);
|
|
imgact_binmisc_destroy_entry(ibe);
|
|
}
|
|
INTERP_LIST_WUNLOCK();
|
|
|
|
INTERP_LIST_LOCK_DESTROY();
|
|
}
|
|
|
|
SYSINIT(imgact_binmisc, SI_SUB_EXEC, SI_ORDER_MIDDLE, imgact_binmisc_init,
|
|
NULL);
|
|
SYSUNINIT(imgact_binmisc, SI_SUB_EXEC, SI_ORDER_MIDDLE, imgact_binmisc_fini,
|
|
NULL);
|
|
|
|
/*
|
|
* Tell kern_execve.c about it, with a little help from the linker.
|
|
*/
|
|
static struct execsw imgact_binmisc_execsw = {
|
|
.ex_imgact = imgact_binmisc_exec,
|
|
.ex_name = KMOD_NAME
|
|
};
|
|
EXEC_SET(imgact_binmisc, imgact_binmisc_execsw);
|