257 lines
6.8 KiB
C
257 lines
6.8 KiB
C
/* $NetBSD: netbsd32_execve.c,v 1.44 2021/11/11 17:32:46 martin Exp $ */
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/*
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* Copyright (c) 1998, 2001 Matthew R. Green
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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 ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* 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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__KERNEL_RCSID(0, "$NetBSD: netbsd32_execve.c,v 1.44 2021/11/11 17:32:46 martin Exp $");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/atomic.h>
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#include <sys/mount.h>
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#include <sys/namei.h>
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#include <sys/stat.h>
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#include <sys/spawn.h>
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#include <sys/uidinfo.h>
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#include <sys/vnode.h>
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#include <sys/file.h>
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#include <sys/filedesc.h>
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#include <sys/syscallargs.h>
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#include <sys/proc.h>
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#include <sys/exec.h>
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#include <compat/netbsd32/netbsd32.h>
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#include <compat/netbsd32/netbsd32_syscall.h>
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#include <compat/netbsd32/netbsd32_syscallargs.h>
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static int
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netbsd32_execve_fetch_element(char * const *array, size_t index, char **value)
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{
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int error;
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netbsd32_charp const *a32 = (void const *)array;
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netbsd32_charp e;
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error = copyin(a32 + index, &e, sizeof(e));
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if (error)
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return error;
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*value = (char *)NETBSD32PTR64(e);
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return 0;
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}
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int
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netbsd32_execve(struct lwp *l, const struct netbsd32_execve_args *uap, register_t *retval)
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{
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/* {
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syscallarg(const netbsd32_charp) path;
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syscallarg(netbsd32_charpp) argp;
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syscallarg(netbsd32_charpp) envp;
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} */
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return execve1(l, true, SCARG_P32(uap, path), -1, SCARG_P32(uap, argp),
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SCARG_P32(uap, envp), netbsd32_execve_fetch_element);
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}
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int
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netbsd32_fexecve(struct lwp *l, const struct netbsd32_fexecve_args *uap,
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register_t *retval)
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{
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/* {
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syscallarg(int) fd;
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syscallarg(netbsd32_charpp) argp;
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syscallarg(netbsd32_charpp) envp;
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} */
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return execve1(l, false, NULL, SCARG(uap, fd), SCARG_P32(uap, argp),
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SCARG_P32(uap, envp), netbsd32_execve_fetch_element);
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}
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static __inline bool
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netbsd32_posix_spawn_fae_path(
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struct posix_spawn_file_actions_entry *fae,
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struct netbsd32_posix_spawn_file_actions_entry *fae32,
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char ***pathp, char **pathp32)
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{
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switch (fae->fae_action) {
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case FAE_OPEN:
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*pathp = &fae->fae_path;
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*pathp32 = NETBSD32PTR64(fae32->fae_data.open.path);
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return true;
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case FAE_CHDIR:
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*pathp = &fae->fae_chdir_path;
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*pathp32 = NETBSD32PTR64(fae32->fae_data.chdir.path);
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return true;
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default:
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return false;
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}
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}
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static int
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netbsd32_posix_spawn_fa_alloc(struct posix_spawn_file_actions **fap,
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const struct netbsd32_posix_spawn_file_actions *ufa, rlim_t lim)
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{
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struct posix_spawn_file_actions *fa;
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struct netbsd32_posix_spawn_file_actions fa32;
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struct netbsd32_posix_spawn_file_actions_entry *fae32 = NULL, *f32 = NULL;
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struct posix_spawn_file_actions_entry *fae;
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char *pbuf = NULL, **pathp = NULL, *pathp32 = NULL;
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int error;
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size_t fal, fal32, slen, i = 0;
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error = copyin(ufa, &fa32, sizeof(fa32));
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if (error)
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return error;
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if (fa32.len == 0)
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return 0;
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fa = kmem_alloc(sizeof(*fa), KM_SLEEP);
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fa->len = fa->size = fa32.len;
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if (fa->len > lim) {
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kmem_free(fa, sizeof(*fa));
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return EINVAL;
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}
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fal = fa->len * sizeof(*fae);
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fal32 = fa->len * sizeof(*fae32);
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fa->fae = kmem_alloc(fal, KM_SLEEP);
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fae32 = kmem_alloc(fal32, KM_SLEEP);
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error = copyin(NETBSD32PTR64(fa32.fae), fae32, fal32);
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if (error)
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goto out;
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pbuf = PNBUF_GET();
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for (; i < fa->len; i++) {
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fae = &fa->fae[i];
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f32 = &fae32[i];
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fae->fae_action = (unsigned)f32->fae_action;
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fae->fae_fildes = f32->fae_fildes;
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if (fae->fae_action == FAE_DUP2)
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fae->fae_data.dup2.newfildes =
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f32->fae_data.dup2.newfildes;
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if (!netbsd32_posix_spawn_fae_path(fae, f32, &pathp, &pathp32)
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|| pathp == NULL || pathp32 == NULL)
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continue;
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error = copyinstr(pathp32, pbuf, MAXPATHLEN, &slen);
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if (error)
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goto out;
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*pathp = kmem_alloc(slen, KM_SLEEP);
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memcpy(*pathp, pbuf, slen);
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fae->fae_oflag = f32->fae_oflag;
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fae->fae_mode = f32->fae_mode;
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}
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PNBUF_PUT(pbuf);
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kmem_free(fae32, fal32);
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*fap = fa;
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return 0;
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out:
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kmem_free(fae32, fal32);
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if (pbuf)
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PNBUF_PUT(pbuf);
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posix_spawn_fa_free(fa, i);
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return error;
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}
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int
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netbsd32_posix_spawn(struct lwp *l,
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const struct netbsd32_posix_spawn_args *uap, register_t *retval)
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{
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/* {
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syscallarg(netbsd32_pid_tp) pid;
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syscallarg(const netbsd32_charp) path;
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syscallarg(const netbsd32_posix_spawn_file_actionsp) file_actions;
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syscallarg(const netbsd32_posix_spawnattrp) attrp;
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syscallarg(netbsd32_charpp) argv;
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syscallarg(netbsd32_charpp) envp;
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} */
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int error;
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struct posix_spawn_file_actions *fa = NULL;
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struct posix_spawnattr *sa = NULL;
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pid_t pid;
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bool child_ok = false;
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rlim_t max_fileactions;
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proc_t *p = l->l_proc;
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/* check_posix_spawn() increments nprocs for us. */
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error = check_posix_spawn(l);
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if (error) {
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*retval = error;
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return 0;
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}
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/* copy in file_actions struct */
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if (SCARG_P32(uap, file_actions) != NULL) {
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max_fileactions = 2 * uimin(p->p_rlimit[RLIMIT_NOFILE].rlim_cur,
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maxfiles);
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error = netbsd32_posix_spawn_fa_alloc(&fa,
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SCARG_P32(uap, file_actions), max_fileactions);
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if (error)
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goto error_exit;
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}
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/* copyin posix_spawnattr struct */
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if (SCARG_P32(uap, attrp) != NULL) {
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sa = kmem_alloc(sizeof(*sa), KM_SLEEP);
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error = copyin(SCARG_P32(uap, attrp), sa, sizeof(*sa));
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if (error)
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goto error_exit;
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}
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/*
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* Do the spawn
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*/
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error = do_posix_spawn(l, &pid, &child_ok, SCARG_P32(uap, path), fa,
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sa, SCARG_P32(uap, argv), SCARG_P32(uap, envp),
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netbsd32_execve_fetch_element);
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if (error)
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goto error_exit;
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if (error == 0 && SCARG_P32(uap, pid) != NULL)
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error = copyout(&pid, SCARG_P32(uap, pid), sizeof(pid));
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*retval = error;
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return 0;
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error_exit:
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if (!child_ok) {
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(void)chgproccnt(kauth_cred_getuid(l->l_cred), -1);
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atomic_dec_uint(&nprocs);
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if (sa)
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kmem_free(sa, sizeof(*sa));
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if (fa)
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posix_spawn_fa_free(fa, fa->len);
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}
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*retval = error;
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return 0;
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}
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