-/* Code for loading BSD executables. Mostly linux kernel code. */
-
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <fcntl.h>
-#include <errno.h>
-#include <unistd.h>
-#include <stdio.h>
-#include <stdlib.h>
+/*
+ * Load BSD executables.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "qemu/osdep.h"
#include "qemu.h"
-#define NGROUPS 32
-
/* ??? This should really be somewhere else. */
abi_long memcpy_to_target(abi_ulong dest, const void *src,
unsigned long len)
void *host_ptr;
host_ptr = lock_user(VERIFY_WRITE, dest, len, 0);
- if (!host_ptr)
+ if (!host_ptr) {
return -TARGET_EFAULT;
+ }
memcpy(host_ptr, src, len);
unlock_user(host_ptr, dest, 1);
return 0;
}
-static int in_group_p(gid_t g)
-{
- /* return TRUE if we're in the specified group, FALSE otherwise */
- int ngroup;
- int i;
- gid_t grouplist[NGROUPS];
-
- ngroup = getgroups(NGROUPS, grouplist);
- for(i = 0; i < ngroup; i++) {
- if(grouplist[i] == g) {
- return 1;
- }
- }
- return 0;
-}
-
-static int count(char ** vec)
+static int count(char **vec)
{
int i;
- for(i = 0; *vec; i++) {
+ for (i = 0; *vec; i++) {
vec++;
}
- return(i);
+ return i;
}
-static int prepare_binprm(struct linux_binprm *bprm)
+static int prepare_binprm(struct bsd_binprm *bprm)
{
struct stat st;
int mode;
- int retval, id_change;
+ int retval;
- if(fstat(bprm->fd, &st) < 0) {
- return(-errno);
+ if (fstat(bprm->fd, &st) < 0) {
+ return -errno;
}
mode = st.st_mode;
- if(!S_ISREG(mode)) { /* Must be regular file */
- return(-EACCES);
+ if (!S_ISREG(mode)) { /* Must be regular file */
+ return -EACCES;
}
- if(!(mode & 0111)) { /* Must have at least one execute bit set */
- return(-EACCES);
+ if (!(mode & 0111)) { /* Must have at least one execute bit set */
+ return -EACCES;
}
bprm->e_uid = geteuid();
bprm->e_gid = getegid();
- id_change = 0;
/* Set-uid? */
- if(mode & S_ISUID) {
+ if (mode & S_ISUID) {
bprm->e_uid = st.st_uid;
- if(bprm->e_uid != geteuid()) {
- id_change = 1;
- }
}
/* Set-gid? */
*/
if ((mode & (S_ISGID | S_IXGRP)) == (S_ISGID | S_IXGRP)) {
bprm->e_gid = st.st_gid;
- if (!in_group_p(bprm->e_gid)) {
- id_change = 1;
- }
}
memset(bprm->buf, 0, sizeof(bprm->buf));
retval = lseek(bprm->fd, 0L, SEEK_SET);
- if(retval >= 0) {
+ if (retval >= 0) {
retval = read(bprm->fd, bprm->buf, 128);
}
- if(retval < 0) {
+ if (retval < 0) {
perror("prepare_binprm");
exit(-1);
- /* return(-errno); */
- }
- else {
- return(retval);
+ } else {
+ return retval;
}
}
/* Construct the envp and argv tables on the target stack. */
abi_ulong loader_build_argptr(int envc, int argc, abi_ulong sp,
- abi_ulong stringp, int push_ptr)
+ abi_ulong stringp)
{
int n = sizeof(abi_ulong);
abi_ulong envp;
envp = sp;
sp -= (argc + 1) * n;
argv = sp;
- if (push_ptr) {
- /* FIXME - handle put_user() failures */
- sp -= n;
- put_user_ual(envp, sp);
- sp -= n;
- put_user_ual(argv, sp);
- }
sp -= n;
/* FIXME - handle put_user() failures */
put_user_ual(argc, sp);
return sp;
}
-int loader_exec(const char * filename, char ** argv, char ** envp,
- struct target_pt_regs * regs, struct image_info *infop)
+static bool is_there(const char *candidate)
{
- struct linux_binprm bprm;
- int retval;
- int i;
+ struct stat fin;
- bprm.p = TARGET_PAGE_SIZE*MAX_ARG_PAGES-sizeof(unsigned int);
- for (i=0 ; i<MAX_ARG_PAGES ; i++) /* clear page-table */
- bprm.page[i] = 0;
- retval = open(filename, O_RDONLY);
- if (retval < 0)
+ /* XXX work around access(2) false positives for superuser */
+ if (access(candidate, X_OK) == 0 && stat(candidate, &fin) == 0 &&
+ S_ISREG(fin.st_mode) && (getuid() != 0 ||
+ (fin.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH)) != 0)) {
+ return true;
+ }
+
+ return false;
+}
+
+int loader_exec(const char *filename, char **argv, char **envp,
+ struct target_pt_regs *regs, struct image_info *infop,
+ struct bsd_binprm *bprm)
+{
+ char *path, fullpath[PATH_MAX];
+ int retval, i;
+
+ bprm->p = TARGET_PAGE_SIZE * MAX_ARG_PAGES;
+ for (i = 0; i < MAX_ARG_PAGES; i++) { /* clear page-table */
+ bprm->page[i] = NULL;
+ }
+
+ if (strchr(filename, '/') != NULL) {
+ path = realpath(filename, fullpath);
+ if (path == NULL) {
+ /* Failed to resolve. */
+ return -1;
+ }
+ if (!is_there(path)) {
+ return -1;
+ }
+ } else {
+ path = g_find_program_in_path(filename);
+ if (path == NULL) {
+ return -1;
+ }
+ }
+
+ retval = open(path, O_RDONLY);
+ if (retval < 0) {
+ g_free(path);
return retval;
- bprm.fd = retval;
- bprm.filename = (char *)filename;
- bprm.argc = count(argv);
- bprm.argv = argv;
- bprm.envc = count(envp);
- bprm.envp = envp;
-
- retval = prepare_binprm(&bprm);
-
- infop->host_argv = argv;
-
- if(retval>=0) {
- if (bprm.buf[0] == 0x7f
- && bprm.buf[1] == 'E'
- && bprm.buf[2] == 'L'
- && bprm.buf[3] == 'F') {
- retval = load_elf_binary(&bprm,regs,infop);
+ }
+
+ bprm->fullpath = path;
+ bprm->fd = retval;
+ bprm->filename = (char *)filename;
+ bprm->argc = count(argv);
+ bprm->argv = argv;
+ bprm->envc = count(envp);
+ bprm->envp = envp;
+
+ retval = prepare_binprm(bprm);
+
+ if (retval >= 0) {
+ if (bprm->buf[0] == 0x7f
+ && bprm->buf[1] == 'E'
+ && bprm->buf[2] == 'L'
+ && bprm->buf[3] == 'F') {
+ retval = load_elf_binary(bprm, regs, infop);
} else {
fprintf(stderr, "Unknown binary format\n");
return -1;
}
}
- if(retval>=0) {
+ if (retval >= 0) {
/* success. Initialize important registers */
do_init_thread(regs, infop);
return retval;
}
/* Something went wrong, return the inode and free the argument pages*/
- for (i=0 ; i<MAX_ARG_PAGES ; i++) {
- free(bprm.page[i]);
+ for (i = 0 ; i < MAX_ARG_PAGES ; i++) {
+ g_free(bprm->page[i]);
}
- return(retval);
+ return retval;
}
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