/* Code for loading Linux 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>
-
+#include "qemu/osdep.h"
#include "qemu.h"
+#include "user-internals.h"
+#include "user-mmap.h"
+#include "loader.h"
+#include "qapi/error.h"
#define NGROUPS 32
/* ??? This should really be somewhere else. */
-abi_long memcpy_to_target(abi_ulong dest, const void *src,
- unsigned long len)
+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;
+ 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)
{
- struct stat st;
+ struct stat st;
int mode;
- int retval, id_change;
+ int retval;
- if(fstat(bprm->fd, &st) < 0) {
- return(-errno);
+ if (fstat(bprm->src.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) {
- bprm->e_uid = st.st_uid;
- if(bprm->e_uid != geteuid()) {
- id_change = 1;
- }
+ if (mode & S_ISUID) {
+ bprm->e_uid = st.st_uid;
}
/* Set-gid? */
* executable.
*/
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;
- }
+ bprm->e_gid = st.st_gid;
}
- retval = read(bprm->fd, bprm->buf, BPRM_BUF_SIZE);
+ retval = read(bprm->src.fd, bprm->buf, BPRM_BUF_SIZE);
if (retval < 0) {
- perror("prepare_binprm");
- exit(-1);
+ perror("prepare_binprm");
+ exit(-1);
}
if (retval < BPRM_BUF_SIZE) {
/* Make sure the rest of the loader won't read garbage. */
memset(bprm->buf + retval, 0, BPRM_BUF_SIZE - retval);
}
+
+ bprm->src.cache = bprm->buf;
+ bprm->src.cache_size = retval;
+
return retval;
}
abi_ulong loader_build_argptr(int envc, int argc, abi_ulong sp,
abi_ulong stringp, int push_ptr)
{
- TaskState *ts = (TaskState *)thread_env->opaque;
+ TaskState *ts = (TaskState *)thread_cpu->opaque;
int n = sizeof(abi_ulong);
abi_ulong envp;
abi_ulong argv;
envp = sp;
sp -= (argc + 1) * n;
argv = sp;
+ ts->info->envp = envp;
+ ts->info->envc = envc;
+ ts->info->argv = argv;
+ ts->info->argc = argc;
+
if (push_ptr) {
/* FIXME - handle put_user() failures */
sp -= n;
sp -= n;
put_user_ual(argv, sp);
}
+
sp -= n;
/* FIXME - handle put_user() failures */
put_user_ual(argc, sp);
- ts->info->arg_start = stringp;
+
+ ts->info->arg_strings = stringp;
while (argc-- > 0) {
/* FIXME - handle put_user() failures */
put_user_ual(stringp, argv);
argv += n;
stringp += target_strlen(stringp) + 1;
}
- ts->info->arg_end = stringp;
/* FIXME - handle put_user() failures */
put_user_ual(0, argv);
+
+ ts->info->env_strings = stringp;
while (envc-- > 0) {
/* FIXME - handle put_user() failures */
put_user_ual(stringp, envp);
return sp;
}
-int loader_exec(const char * filename, char ** argv, char ** envp,
- struct target_pt_regs * regs, struct image_info *infop,
- struct linux_binprm *bprm)
+int loader_exec(int fdexec, const char *filename, char **argv, char **envp,
+ struct target_pt_regs *regs, struct image_info *infop,
+ struct linux_binprm *bprm)
{
int retval;
- int i;
- bprm->p = TARGET_PAGE_SIZE*MAX_ARG_PAGES-sizeof(unsigned int);
- memset(bprm->page, 0, sizeof(bprm->page));
- retval = open(filename, O_RDONLY);
- if (retval < 0)
- return retval;
- bprm->fd = retval;
+ bprm->src.fd = fdexec;
bprm->filename = (char *)filename;
bprm->argc = count(argv);
bprm->argv = argv;
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);
+ if (retval < 4) {
+ return -ENOEXEC;
+ }
+ if (bprm->buf[0] == 0x7f
+ && bprm->buf[1] == 'E'
+ && bprm->buf[2] == 'L'
+ && bprm->buf[3] == 'F') {
+ retval = load_elf_binary(bprm, infop);
#if defined(TARGET_HAS_BFLT)
- } else if (bprm->buf[0] == 'b'
- && bprm->buf[1] == 'F'
- && bprm->buf[2] == 'L'
- && bprm->buf[3] == 'T') {
- retval = load_flt_binary(bprm,regs,infop);
+ } else if (bprm->buf[0] == 'b'
+ && bprm->buf[1] == 'F'
+ && bprm->buf[2] == 'L'
+ && bprm->buf[3] == 'T') {
+ retval = load_flt_binary(bprm, infop);
#endif
- } else {
- fprintf(stderr, "Unknown binary format\n");
- return -1;
- }
+ } else {
+ return -ENOEXEC;
}
-
- if(retval>=0) {
- /* success. Initialize important registers */
- do_init_thread(regs, infop);
+ if (retval < 0) {
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]);
+ /* Success. Initialize important registers. */
+ do_init_thread(regs, infop);
+ return 0;
+}
+
+bool imgsrc_read(void *dst, off_t offset, size_t len,
+ const ImageSource *img, Error **errp)
+{
+ ssize_t ret;
+
+ if (offset + len <= img->cache_size) {
+ memcpy(dst, img->cache + offset, len);
+ return true;
+ }
+
+ if (img->fd < 0) {
+ error_setg(errp, "read past end of buffer");
+ return false;
+ }
+
+ ret = pread(img->fd, dst, len, offset);
+ if (ret == len) {
+ return true;
+ }
+ if (ret < 0) {
+ error_setg_errno(errp, errno, "Error reading file header");
+ } else {
+ error_setg(errp, "Incomplete read of file header");
+ }
+ return false;
+}
+
+void *imgsrc_read_alloc(off_t offset, size_t len,
+ const ImageSource *img, Error **errp)
+{
+ void *alloc = g_malloc(len);
+ bool ok = imgsrc_read(alloc, offset, len, img, errp);
+
+ if (!ok) {
+ g_free(alloc);
+ alloc = NULL;
}
- return(retval);
+ return alloc;
+}
+
+abi_long imgsrc_mmap(abi_ulong start, abi_ulong len, int prot,
+ int flags, const ImageSource *src, abi_ulong offset)
+{
+ const int prot_write = PROT_READ | PROT_WRITE;
+ abi_long ret;
+ void *haddr;
+
+ assert(flags == (MAP_PRIVATE | MAP_FIXED));
+
+ if (src->fd >= 0) {
+ return target_mmap(start, len, prot, flags, src->fd, offset);
+ }
+
+ /*
+ * This case is for the vdso; we don't expect bad images.
+ * The mmap may extend beyond the end of the image, especially
+ * to the end of the page. Zero fill.
+ */
+ assert(offset < src->cache_size);
+
+ ret = target_mmap(start, len, prot_write, flags | MAP_ANON, -1, 0);
+ if (ret == -1) {
+ return ret;
+ }
+
+ haddr = lock_user(VERIFY_WRITE, start, len, 0);
+ assert(haddr != NULL);
+ if (offset + len <= src->cache_size) {
+ memcpy(haddr, src->cache + offset, len);
+ } else {
+ size_t rest = src->cache_size - offset;
+ memcpy(haddr, src->cache + offset, rest);
+ memset(haddr + rest, 0, len - rest);
+ }
+ unlock_user(haddr, start, len);
+
+ if (prot != prot_write) {
+ target_mprotect(start, len, prot);
+ }
+
+ return ret;
}
projects / mirror_qemu.git / blobdiff