+#include <elf.h>
+#include <poll.h>
+#include <fcntl.h>
+#include "syscall.h"
+#include "atomic.h"
#include "libc.h"
void __init_tls(size_t *);
-void __init_security(size_t *);
-int __libc_start_main(
- int (*main)(int, char **, char **), int argc, char **argv,
- int (*init)(int, char **, char **), void (*fini)(void),
- void (*ldso_fini)(void))
-{
- char **envp = argv+argc+1, **auxv = envp;
+#ifndef SHARED
+static void dummy() {}
+weak_alias(dummy, _init);
+extern void (*const __init_array_start)() __attribute__((weak));
+extern void (*const __init_array_end)() __attribute__((weak));
+#endif
+
+static void dummy1(void *p) {}
+weak_alias(dummy1, __init_ssp);
+
+#define AUX_CNT 38
+extern size_t __hwcap, __sysinfo;
+extern char *__progname, *__progname_full;
+
+#ifndef SHARED
+static
+#endif
+void __init_libc(char **envp, char *pn)
+{
+ size_t i, *auxv, aux[AUX_CNT] = { 0 };
__environ = envp;
- do auxv++; while (*auxv);
- libc.auxv = (void *)++auxv;
- libc.ldso_fini = ldso_fini;
- libc.fini = fini;
+ for (i=0; envp[i]; i++);
+ libc.auxv = auxv = (void *)(envp+i+1);
+ for (i=0; auxv[i]; i+=2) if (auxv[i]<AUX_CNT) aux[auxv[i]] = auxv[i+1];
+ __hwcap = aux[AT_HWCAP];
+ __sysinfo = aux[AT_SYSINFO];
+ libc.page_size = aux[AT_PAGESZ];
+
+ if (pn) {
+ __progname = __progname_full = pn;
+ for (i=0; pn[i]; i++) if (pn[i]=='/') __progname = pn+i+1;
+ }
- __init_tls((void *)auxv);
- __init_security((void *)auxv);
+ __init_tls(aux);
+ __init_ssp((void *)aux[AT_RANDOM]);
+
+ if (aux[AT_UID]==aux[AT_EUID] && aux[AT_GID]==aux[AT_EGID]
+ && !aux[AT_SECURE]) return;
+
+ struct pollfd pfd[3] = { {.fd=0}, {.fd=1}, {.fd=2} };
+ __syscall(SYS_poll, pfd, 3, 0);
+ for (i=0; i<3; i++) if (pfd[i].revents&POLLNVAL)
+ if (__sys_open("/dev/null", O_RDWR)<0)
+ a_crash();
+ libc.secure = 1;
+}
+
+int __libc_start_main(int (*main)(int,char **,char **), int argc, char **argv)
+{
+ char **envp = argv+argc+1;
- /* Execute constructors (static) linked into the application */
- if (init) init(argc, argv, envp);
+#ifndef SHARED
+ __init_libc(envp, argv[0]);
+ _init();
+ uintptr_t a = (uintptr_t)&__init_array_start;
+ for (; a<(uintptr_t)&__init_array_end; a+=sizeof(void(*)()))
+ (*(void (**)())a)();
+#endif
/* Pass control to to application */
exit(main(argc, argv, envp));