9 files changed, 46 insertions, 14 deletions

diff --git a/arch/um/os-Linux/Makefile b/arch/um/os-Linux/Makefile
index d66f0388f09..b33f4dfe7ae 100644
--- a/arch/um/os-Linux/Makefile
+++ b/arch/um/os-Linux/Makefile
@@ -3,10 +3,12 @@
 # Licensed under the GPL
 #
 
-obj-y = aio.o elf_aux.o execvp.o file.o helper.o irq.o main.o mem.o process.o \
+obj-y = aio.o execvp.o file.o helper.o irq.o main.o mem.o process.o \
         registers.o sigio.o signal.o start_up.o time.o tty.o uaccess.o \
         umid.o tls.o user_syms.o util.o drivers/ sys-$(SUBARCH)/ skas/
 
+obj-$(CONFIG_ARCH_REUSE_HOST_VSYSCALL_AREA) += elf_aux.o
+
 USER_OBJS := $(user-objs-y) aio.o elf_aux.o execvp.o file.o helper.o irq.o \
         main.o mem.o process.o registers.o sigio.o signal.o start_up.o time.o \
         tty.o tls.o uaccess.o umid.o util.o
diff --git a/arch/um/os-Linux/elf_aux.c b/arch/um/os-Linux/elf_aux.c
index 608784d4ec5..95332379938 100644
--- a/arch/um/os-Linux/elf_aux.c
+++ b/arch/um/os-Linux/elf_aux.c
@@ -14,16 +14,11 @@
 #include "mem_user.h"
 #include <kern_constants.h>
 
-/* Use the one from the kernel - the host may miss it, if having old headers. */
-#if UM_ELF_CLASS == UM_ELFCLASS32
 typedef Elf32_auxv_t elf_auxv_t;
-#else
-typedef Elf64_auxv_t elf_auxv_t;
-#endif
 
 /* These are initialized very early in boot and never changed */
 char * elf_aux_platform;
-long elf_aux_hwcap;
+extern long elf_aux_hwcap;
 unsigned long vsyscall_ehdr;
 unsigned long vsyscall_end;
 unsigned long __kernel_vsyscall;
diff --git a/arch/um/os-Linux/helper.c b/arch/um/os-Linux/helper.c
index b6b1096152a..feff22d6467 100644
--- a/arch/um/os-Linux/helper.c
+++ b/arch/um/os-Linux/helper.c
@@ -28,14 +28,14 @@ static int helper_child(void *arg)
 {
         struct helper_data *data = arg;
         char **argv = data->argv;
-        int err;
+        int err, ret;
 
         if (data->pre_exec != NULL)
                 (*data->pre_exec)(data->pre_data);
         err = execvp_noalloc(data->buf, argv[0], argv);
 
         /* If the exec succeeds, we don't get here */
-        write(data->fd, &err, sizeof(err));
+        CATCH_EINTR(ret = write(data->fd, &err, sizeof(err)));
 
         return 0;
 }
diff --git a/arch/um/os-Linux/main.c b/arch/um/os-Linux/main.c
index fb2a97a75fb..8471b817d94 100644
--- a/arch/um/os-Linux/main.c
+++ b/arch/um/os-Linux/main.c
@@ -21,6 +21,8 @@
 #define STACKSIZE (8 * 1024 * 1024)
 #define THREAD_NAME_LEN (256)
 
+long elf_aux_hwcap;
+
 static void set_stklim(void)
 {
         struct rlimit lim;
@@ -143,7 +145,9 @@ int __init main(int argc, char **argv, char **envp)
         install_fatal_handler(SIGINT);
         install_fatal_handler(SIGTERM);
 
+#ifdef CONFIG_ARCH_REUSE_HOST_VSYSCALL_AREA
         scan_elf_aux(envp);
+#endif
 
         do_uml_initcalls();
         ret = linux_main(argc, argv);
diff --git a/arch/um/os-Linux/mem.c b/arch/um/os-Linux/mem.c
index e696144d2be..62878cf1d33 100644
--- a/arch/um/os-Linux/mem.c
+++ b/arch/um/os-Linux/mem.c
@@ -176,7 +176,7 @@ static int __init make_tempfile(const char *template, char **out_tempname,
 
         find_tempdir();
         if ((tempdir == NULL) || (strlen(tempdir) >= MAXPATHLEN))
-                return -1;
+                goto out;
 
         if (template[0] != '/')
                 strcpy(tempname, tempdir);
@@ -191,13 +191,15 @@ static int __init make_tempfile(const char *template, char **out_tempname,
         }
         if (do_unlink && (unlink(tempname) < 0)) {
                 perror("unlink");
-                goto out;
+                goto close;
         }
         if (out_tempname) {
                 *out_tempname = tempname;
         } else
                 free(tempname);
         return fd;
+close:
+        close(fd);
 out:
         free(tempname);
         return -1;
diff --git a/arch/um/os-Linux/registers.c b/arch/um/os-Linux/registers.c
index 830fe6a1518..b866b9e3bef 100644
--- a/arch/um/os-Linux/registers.c
+++ b/arch/um/os-Linux/registers.c
@@ -8,6 +8,8 @@
 #include <string.h>
 #include <sys/ptrace.h>
 #include "sysdep/ptrace.h"
+#include "sysdep/ptrace_user.h"
+#include "registers.h"
 
 int save_registers(int pid, struct uml_pt_regs *regs)
 {
@@ -32,6 +34,7 @@ int restore_registers(int pid, struct uml_pt_regs *regs)
 /* This is set once at boot time and not changed thereafter */
 
 static unsigned long exec_regs[MAX_REG_NR];
+static unsigned long exec_fp_regs[FP_SIZE];
 
 int init_registers(int pid)
 {
@@ -42,10 +45,14 @@ int init_registers(int pid)
                 return -errno;
 
         arch_init_registers(pid);
+        get_fp_registers(pid, exec_fp_regs);
         return 0;
 }
 
-void get_safe_registers(unsigned long *regs)
+void get_safe_registers(unsigned long *regs, unsigned long *fp_regs)
 {
         memcpy(regs, exec_regs, sizeof(exec_regs));
+
+        if (fp_regs)
+                memcpy(fp_regs, exec_fp_regs, sizeof(exec_fp_regs));
 }
diff --git a/arch/um/os-Linux/skas/mem.c b/arch/um/os-Linux/skas/mem.c
index d261f170d12..e771398be5f 100644
--- a/arch/um/os-Linux/skas/mem.c
+++ b/arch/um/os-Linux/skas/mem.c
@@ -39,7 +39,7 @@ static unsigned long syscall_regs[MAX_REG_NR];
 
 static int __init init_syscall_regs(void)
 {
-        get_safe_registers(syscall_regs);
+        get_safe_registers(syscall_regs, NULL);
         syscall_regs[REGS_IP_INDEX] = STUB_CODE +
                 ((unsigned long) &batch_syscall_stub -
                  (unsigned long) &__syscall_stub_start);
diff --git a/arch/um/os-Linux/skas/process.c b/arch/um/os-Linux/skas/process.c
index d6e0a2234b8..dee0e8cf8ad 100644
--- a/arch/um/os-Linux/skas/process.c
+++ b/arch/um/os-Linux/skas/process.c
@@ -373,6 +373,9 @@ void userspace(struct uml_pt_regs *regs)
                 if (ptrace(PTRACE_SETREGS, pid, 0, regs->gp))
                         fatal_sigsegv();
 
+                if (put_fp_registers(pid, regs->fp))
+                        fatal_sigsegv();
+
                 /* Now we set local_using_sysemu to be used for one loop */
                 local_using_sysemu = get_using_sysemu();
 
@@ -399,6 +402,12 @@ void userspace(struct uml_pt_regs *regs)
                         fatal_sigsegv();
                 }
 
+                if (get_fp_registers(pid, regs->fp)) {
+                        printk(UM_KERN_ERR "userspace -  get_fp_registers failed, "
+                               "errno = %d\n", errno);
+                        fatal_sigsegv();
+                }
+
                 UPT_SYSCALL_NR(regs) = -1; /* Assume: It's not a syscall */
 
                 if (WIFSTOPPED(status)) {
@@ -457,10 +466,11 @@ void userspace(struct uml_pt_regs *regs)
 }
 
 static unsigned long thread_regs[MAX_REG_NR];
+static unsigned long thread_fp_regs[FP_SIZE];
 
 static int __init init_thread_regs(void)
 {
-        get_safe_registers(thread_regs);
+        get_safe_registers(thread_regs, thread_fp_regs);
         /* Set parent's instruction pointer to start of clone-stub */
         thread_regs[REGS_IP_INDEX] = STUB_CODE +
                                 (unsigned long) stub_clone_handler -
@@ -503,6 +513,13 @@ int copy_context_skas0(unsigned long new_stack, int pid)
                 return err;
         }
 
+        err = put_fp_registers(pid, thread_fp_regs);
+        if (err < 0) {
+                printk(UM_KERN_ERR "copy_context_skas0 : put_fp_registers "
+                       "failed, pid = %d, err = %d\n", pid, err);
+                return err;
+        }
+
         /* set a well known return code for detection of child write failure */
         child_data->err = 12345678;
 
diff --git a/arch/um/os-Linux/user_syms.c b/arch/um/os-Linux/user_syms.c
index 05f5ea8e83d..45ffe46871e 100644
--- a/arch/um/os-Linux/user_syms.c
+++ b/arch/um/os-Linux/user_syms.c
@@ -113,3 +113,8 @@ EXPORT_SYMBOL(__stack_smash_handler);
 
 extern long __guard __attribute__((weak));
 EXPORT_SYMBOL(__guard);
+
+#ifdef _FORTIFY_SOURCE
+extern int __sprintf_chk(char *str, int flag, size_t strlen, const char *format);
+EXPORT_SYMBOL(__sprintf_chk);
+#endif