mirror of
https://gitlab.com/qemu-project/qemu.git
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d8fcdad2d6
Signed-off-by: Warner Losh <imp@bsdimp.com> Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
215 lines
5.3 KiB
C
215 lines
5.3 KiB
C
/*
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* Load BSD executables.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "qemu/osdep.h"
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#include "qemu.h"
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/* ??? This should really be somewhere else. */
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abi_long memcpy_to_target(abi_ulong dest, const void *src,
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unsigned long len)
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{
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void *host_ptr;
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host_ptr = lock_user(VERIFY_WRITE, dest, len, 0);
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if (!host_ptr) {
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return -TARGET_EFAULT;
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}
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memcpy(host_ptr, src, len);
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unlock_user(host_ptr, dest, 1);
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return 0;
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}
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static int count(char **vec)
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{
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int i;
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for (i = 0; *vec; i++) {
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vec++;
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}
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return i;
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}
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static int prepare_binprm(struct bsd_binprm *bprm)
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{
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struct stat st;
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int mode;
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int retval;
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if (fstat(bprm->fd, &st) < 0) {
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return -errno;
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}
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mode = st.st_mode;
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if (!S_ISREG(mode)) { /* Must be regular file */
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return -EACCES;
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}
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if (!(mode & 0111)) { /* Must have at least one execute bit set */
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return -EACCES;
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}
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bprm->e_uid = geteuid();
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bprm->e_gid = getegid();
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/* Set-uid? */
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if (mode & S_ISUID) {
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bprm->e_uid = st.st_uid;
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}
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/* Set-gid? */
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/*
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* If setgid is set but no group execute bit then this
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* is a candidate for mandatory locking, not a setgid
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* executable.
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*/
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if ((mode & (S_ISGID | S_IXGRP)) == (S_ISGID | S_IXGRP)) {
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bprm->e_gid = st.st_gid;
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}
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memset(bprm->buf, 0, sizeof(bprm->buf));
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retval = lseek(bprm->fd, 0L, SEEK_SET);
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if (retval >= 0) {
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retval = read(bprm->fd, bprm->buf, 128);
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}
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if (retval < 0) {
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perror("prepare_binprm");
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exit(-1);
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} else {
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return retval;
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}
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}
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/* Construct the envp and argv tables on the target stack. */
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abi_ulong loader_build_argptr(int envc, int argc, abi_ulong sp,
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abi_ulong stringp)
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{
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int n = sizeof(abi_ulong);
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abi_ulong envp;
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abi_ulong argv;
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sp -= (envc + 1) * n;
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envp = sp;
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sp -= (argc + 1) * n;
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argv = sp;
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sp -= n;
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/* FIXME - handle put_user() failures */
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put_user_ual(argc, sp);
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while (argc-- > 0) {
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/* FIXME - handle put_user() failures */
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put_user_ual(stringp, argv);
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argv += n;
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stringp += target_strlen(stringp) + 1;
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}
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/* FIXME - handle put_user() failures */
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put_user_ual(0, argv);
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while (envc-- > 0) {
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/* FIXME - handle put_user() failures */
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put_user_ual(stringp, envp);
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envp += n;
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stringp += target_strlen(stringp) + 1;
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}
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/* FIXME - handle put_user() failures */
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put_user_ual(0, envp);
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return sp;
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}
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static bool is_there(const char *candidate)
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{
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struct stat fin;
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/* XXX work around access(2) false positives for superuser */
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if (access(candidate, X_OK) == 0 && stat(candidate, &fin) == 0 &&
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S_ISREG(fin.st_mode) && (getuid() != 0 ||
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(fin.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH)) != 0)) {
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return true;
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}
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return false;
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}
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int loader_exec(const char *filename, char **argv, char **envp,
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struct target_pt_regs *regs, struct image_info *infop,
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struct bsd_binprm *bprm)
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{
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char *path, fullpath[PATH_MAX];
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int retval, i;
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bprm->p = TARGET_PAGE_SIZE * MAX_ARG_PAGES;
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for (i = 0; i < MAX_ARG_PAGES; i++) { /* clear page-table */
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bprm->page[i] = NULL;
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}
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if (strchr(filename, '/') != NULL) {
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path = realpath(filename, fullpath);
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if (path == NULL) {
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/* Failed to resolve. */
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return -1;
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}
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if (!is_there(path)) {
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return -1;
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}
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} else {
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path = g_find_program_in_path(filename);
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if (path == NULL) {
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return -1;
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}
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}
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retval = open(path, O_RDONLY);
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if (retval < 0) {
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g_free(path);
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return retval;
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}
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bprm->fullpath = path;
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bprm->fd = retval;
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bprm->filename = (char *)filename;
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bprm->argc = count(argv);
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bprm->argv = argv;
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bprm->envc = count(envp);
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bprm->envp = envp;
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retval = prepare_binprm(bprm);
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if (retval >= 0) {
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if (bprm->buf[0] == 0x7f
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&& bprm->buf[1] == 'E'
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&& bprm->buf[2] == 'L'
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&& bprm->buf[3] == 'F') {
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retval = load_elf_binary(bprm, regs, infop);
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} else {
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fprintf(stderr, "Unknown binary format\n");
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return -1;
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}
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}
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if (retval >= 0) {
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/* success. Initialize important registers */
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do_init_thread(regs, infop);
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return retval;
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}
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/* Something went wrong, return the inode and free the argument pages*/
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for (i = 0 ; i < MAX_ARG_PAGES ; i++) {
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g_free(bprm->page[i]);
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}
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return retval;
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}
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