X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=src%2Fenv%2F__libc_start_main.c;h=8fbe526271d812cc467664e9a1c96fb813c528b7;hb=4554f155dd23a65fcdfd39f1d5af8af55ba37694;hp=ac37492298520cea05a4fcdcd7cd513dd91aa885;hpb=7e8b0761e57266f40b8d51105b84c50e504e89c5;p=musl

diff --git a/src/env/__libc_start_main.c b/src/env/__libc_start_main.c
index ac374922..8fbe5262 100644
--- a/src/env/__libc_start_main.c
+++ b/src/env/__libc_start_main.c
@@ -1,21 +1,25 @@
 #include <elf.h>
+#include <poll.h>
+#include <fcntl.h>
+#include <signal.h>
+#include <unistd.h>
+#include "syscall.h"
+#include "atomic.h"
 #include "libc.h"
 
-void __init_tls(size_t *);
-void __init_security(size_t *);
-
-#ifndef SHARED
-static void dummy() {}
+static void dummy(void) {}
 weak_alias(dummy, _init);
-extern void (*const __init_array_start)() __attribute__((weak));
-extern void (*const __init_array_end)() __attribute__((weak));
-#endif
 
-#define AUX_CNT 38
+extern weak hidden void (*const __init_array_start)(void), (*const __init_array_end)(void);
 
-extern size_t __hwcap, __sysinfo;
-extern char *__progname, *__progname_full;
+static void dummy1(void *p) {}
+weak_alias(dummy1, __init_ssp);
 
+#define AUX_CNT 38
+
+#ifdef __GNUC__
+__attribute__((__noinline__))
+#endif
 void __init_libc(char **envp, char *pn)
 {
 	size_t i, *auxv, aux[AUX_CNT] = { 0 };
@@ -24,31 +28,69 @@ void __init_libc(char **envp, char *pn)
 	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];
+	if (aux[AT_SYSINFO]) __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;
-	}
+	if (!pn) pn = (void*)aux[AT_EXECFN];
+	if (!pn) pn = "";
+	__progname = __progname_full = pn;
+	for (i=0; pn[i]; i++) if (pn[i]=='/') __progname = pn+i+1;
 
 	__init_tls(aux);
-	__init_security(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} };
+	int r =
+#ifdef SYS_poll
+	__syscall(SYS_poll, pfd, 3, 0);
+#else
+	__syscall(SYS_ppoll, pfd, 3, &(struct timespec){0}, 0, _NSIG/8);
+#endif
+	if (r<0) a_crash();
+	for (i=0; i<3; i++) if (pfd[i].revents&POLLNVAL)
+		if (__sys_open("/dev/null", O_RDWR)<0)
+			a_crash();
+	libc.secure = 1;
+}
+
+static void libc_start_init(void)
+{
+	_init();
+	uintptr_t a = (uintptr_t)&__init_array_start;
+	for (; a<(uintptr_t)&__init_array_end; a+=sizeof(void(*)()))
+		(*(void (**)(void))a)();
 }
 
+weak_alias(libc_start_init, __libc_start_init);
+
+typedef int lsm2_fn(int (*)(int,char **,char **), int, char **);
+static lsm2_fn libc_start_main_stage2;
+
 int __libc_start_main(int (*main)(int,char **,char **), int argc, char **argv)
 {
 	char **envp = argv+argc+1;
 
-#ifndef SHARED
+	/* External linkage, and explicit noinline attribute if available,
+	 * are used to prevent the stack frame used during init from
+	 * persisting for the entire process lifetime. */
 	__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 */
+	/* Barrier against hoisting application code or anything using ssp
+	 * or thread pointer prior to its initialization above. */
+	lsm2_fn *stage2 = libc_start_main_stage2;
+	__asm__ ( "" : "+r"(stage2) : : "memory" );
+	return stage2(main, argc, argv);
+}
+
+static int libc_start_main_stage2(int (*main)(int,char **,char **), int argc, char **argv)
+{
+	char **envp = argv+argc+1;
+	__libc_start_init();
+
+	/* Pass control to the application */
 	exit(main(argc, argv, envp));
 	return 0;
 }