1 files changed, 118 insertions, 2 deletions

diff --git a/arch/um/os-Linux/start_up.c b/arch/um/os-Linux/start_up.c
index 040cc1472bc..b99ab414542 100644
--- a/arch/um/os-Linux/start_up.c
+++ b/arch/um/os-Linux/start_up.c
@@ -4,18 +4,22 @@
  */
 
 #include <stdio.h>
+#include <stddef.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <string.h>
 #include <unistd.h>
 #include <signal.h>
 #include <sched.h>
+#include <fcntl.h>
 #include <errno.h>
-#include <stdarg.h>
-#include <stdlib.h>
 #include <setjmp.h>
 #include <sys/time.h>
 #include <sys/wait.h>
 #include <sys/mman.h>
 #include <asm/unistd.h>
 #include <asm/page.h>
+#include <sys/types.h>
 #include "user_util.h"
 #include "kern_util.h"
 #include "user.h"
@@ -25,6 +29,7 @@
 #include "sysdep/sigcontext.h"
 #include "irq_user.h"
 #include "ptrace_user.h"
+#include "mem_user.h"
 #include "time_user.h"
 #include "init.h"
 #include "os.h"
@@ -32,6 +37,8 @@
 #include "choose-mode.h"
 #include "mode.h"
 #include "tempfile.h"
+#include "kern_constants.h"
+
 #ifdef UML_CONFIG_MODE_SKAS
 #include "skas.h"
 #include "skas_ptrace.h"
@@ -136,11 +143,22 @@ static int __init skas0_cmd_param(char *str, int* add)
         return 0;
 }
 
+/* The two __uml_setup would conflict, without this stupid alias. */
+
+static int __init mode_skas0_cmd_param(char *str, int* add)
+        __attribute__((alias("skas0_cmd_param")));
+
 __uml_setup("skas0", skas0_cmd_param,
                 "skas0\n"
                 "    Disables SKAS3 usage, so that SKAS0 is used, unless \n"
                 "    you specify mode=tt.\n\n");
 
+__uml_setup("mode=skas0", mode_skas0_cmd_param,
+                "mode=skas0\n"
+                "    Disables SKAS3 usage, so that SKAS0 is used, unless you \n"
+                "    specify mode=tt. Note that this was recently added - on \n"
+                "    older kernels you must use simply \"skas0\".\n\n");
+
 static int force_sysemu_disabled = 0;
 
 static int __init nosysemu_cmd_param(char *str, int* add)
@@ -276,9 +294,38 @@ static void __init check_ptrace(void)
         check_sysemu();
 }
 
+extern int create_tmp_file(unsigned long len);
+
+static void check_tmpexec(void)
+{
+        void *addr;
+        int err, fd = create_tmp_file(UM_KERN_PAGE_SIZE);
+
+        addr = mmap(NULL, UM_KERN_PAGE_SIZE,
+                    PROT_READ | PROT_WRITE | PROT_EXEC, MAP_PRIVATE, fd, 0);
+        printf("Checking PROT_EXEC mmap in /tmp...");
+        fflush(stdout);
+        if(addr == MAP_FAILED){
+                err = errno;
+                perror("failed");
+                if(err == EPERM)
+                        printf("/tmp must be not mounted noexec\n");
+                exit(1);
+        }
+        printf("OK\n");
+        munmap(addr, UM_KERN_PAGE_SIZE);
+
+        close(fd);
+}
+
 void os_early_checks(void)
 {
         check_ptrace();
+
+        /* Need to check this early because mmapping happens before the
+         * kernel is running.
+         */
+        check_tmpexec();
 }
 
 static int __init noprocmm_cmd_param(char *str, int* add)
@@ -357,3 +404,72 @@ int can_do_skas(void)
         return(0);
 }
 #endif
+
+int have_devanon = 0;
+
+void check_devanon(void)
+{
+        int fd;
+
+        printk("Checking for /dev/anon on the host...");
+        fd = open("/dev/anon", O_RDWR);
+        if(fd < 0){
+                printk("Not available (open failed with errno %d)\n", errno);
+                return;
+        }
+
+        printk("OK\n");
+        have_devanon = 1;
+}
+
+int __init parse_iomem(char *str, int *add)
+{
+        struct iomem_region *new;
+        struct uml_stat buf;
+        char *file, *driver;
+        int fd, err, size;
+
+        driver = str;
+        file = strchr(str,',');
+        if(file == NULL){
+                printf("parse_iomem : failed to parse iomem\n");
+                goto out;
+        }
+        *file = '\0';
+        file++;
+        fd = os_open_file(file, of_rdwr(OPENFLAGS()), 0);
+        if(fd < 0){
+                os_print_error(fd, "parse_iomem - Couldn't open io file");
+                goto out;
+        }
+
+        err = os_stat_fd(fd, &buf);
+        if(err < 0){
+                os_print_error(err, "parse_iomem - cannot stat_fd file");
+                goto out_close;
+        }
+
+        new = malloc(sizeof(*new));
+        if(new == NULL){
+                perror("Couldn't allocate iomem_region struct");
+                goto out_close;
+        }
+
+        size = (buf.ust_size + UM_KERN_PAGE_SIZE) & ~(UM_KERN_PAGE_SIZE - 1);
+
+        *new = ((struct iomem_region) { .next           = iomem_regions,
+                                        .driver         = driver,
+                                        .fd             = fd,
+                                        .size           = size,
+                                        .phys           = 0,
+                                        .virt           = 0 });
+        iomem_regions = new;
+        iomem_size += new->size + UM_KERN_PAGE_SIZE;
+
+        return(0);
+ out_close:
+        os_close_file(fd);
+ out:
+        return(1);
+}
+