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Index: libexec/rtld-elf/map_object.c
===================================================================
--- libexec/rtld-elf/map_object.c
+++ libexec/rtld-elf/map_object.c
@@ -193,6 +193,8 @@
base_flags = MAP_PRIVATE | MAP_ANON | MAP_NOCORE;
if (npagesizes > 1 && round_page(segs[0]->p_filesz) >= pagesizes[1])
base_flags |= MAP_ALIGNED_SUPER;
+ if (base_vaddr != 0)
+ base_flags |= MAP_FIXED | MAP_EXCL;
mapbase = mmap(base_addr, mapsize, PROT_NONE, base_flags, -1, 0);
if (mapbase == (caddr_t) -1) {
Index: libexec/rtld-elf/rtld.c
===================================================================
--- libexec/rtld-elf/rtld.c
+++ libexec/rtld-elf/rtld.c
@@ -345,7 +345,8 @@
const Elf_Phdr *phdr;
Objlist initlist;
RtldLockState lockstate;
- char **argv, *argv0, **env, *kexecpath, *library_path_rpath;
+ Elf_Addr *argcp;
+ char **argv, *argv0, **env, **envp, *kexecpath, *library_path_rpath;
caddr_t imgentry;
char buf[MAXPATHLEN];
int argc, fd, i, mib[2], phnum;
@@ -359,6 +360,7 @@
*/
/* Find the auxiliary vector on the stack. */
+ argcp = sp;
argc = *sp++;
argv = (char **) sp;
sp += argc + 1; /* Skip over arguments and NULL terminator */
@@ -466,12 +468,60 @@
dbg("initializing thread locks");
lockdflt_init();
+ fd = -1;
+
/*
* Load the main program, or process its program header if it is
* already loaded.
*/
- if (aux_info[AT_EXECFD] != NULL) { /* Load the main program. */
+ if (aux_info[AT_EXECFD] != NULL) {
fd = aux_info[AT_EXECFD]->a_un.a_val;
+ } else {
+ assert(aux_info[AT_PHDR] != NULL);
+ phdr = (const Elf_Phdr *)aux_info[AT_PHDR]->a_un.a_ptr;
+ if (phdr == obj_rtld.phdr) {
+ dbg("opening main program in direct exec mode");
+ if (argc >= 2) {
+ argv0 = argv[1];
+ fd = open(argv0, O_RDONLY | O_CLOEXEC | O_VERIFY);
+ if (fd == -1) {
+ rtld_printf("Opening %s: %s\n", argv0,
+ rtld_strerror(errno));
+ rtld_die();
+ }
+
+ /*
+ * For direct exec mode, argv[0] is the interpreter
+ * name, we must remove it and shift arguments left by
+ * 1 before invoking binary main. Since stack layout
+ * places environment pointers and aux vectors right
+ * after the terminating NULL, we must shift
+ * environment and aux as well.
+ * XXX Shift will be > 1 when options are implemented.
+ */
+ do {
+ *argv = *(argv + 1);
+ argv++;
+ } while (*argv != 0);
+ *argcp -= 1;
+ main_argc = argc - 1;
+ envp = argv;
+ do {
+ *envp = *(envp + 1);
+ envp++;
+ } while (*envp != 0);
+ auxp = (Elf_Auxinfo *)(envp + 1);
+ do {
+ *auxp = *(auxp + 1);
+ auxp++;
+ } while (auxp->a_type != AT_NULL);
+ } else {
+ rtld_printf("no binary\n");
+ rtld_die();
+ }
+ }
+ }
+ if (fd != -1) { /* Load the main program. */
dbg("loading main program");
obj_main = map_object(fd, argv0, NULL);
close(fd);
@@ -492,7 +542,7 @@
rtld_die();
}
- if (aux_info[AT_EXECPATH] != NULL) {
+ if (aux_info[AT_EXECPATH] != NULL && fd == -1) {
kexecpath = aux_info[AT_EXECPATH]->a_un.a_ptr;
dbg("AT_EXECPATH %p %s", kexecpath, kexecpath);
if (kexecpath[0] == '/')
@@ -504,7 +554,7 @@
else
obj_main->path = xstrdup(buf);
} else {
- dbg("No AT_EXECPATH");
+ dbg("No AT_EXECPATH or direct exec");
obj_main->path = xstrdup(argv0);
}
dbg("obj_main path %s", obj_main->path);

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