[PATCH] uml: add mode=skas0 as a synonym of skas0

[linux-2.6-microblaze.git] / arch / um / os-Linux / start_up.c

diff --git a/arch/um/os-Linux/start_up.c b/arch/um/os-Linux/start_up.c
index 040cc14..b99ab41 100644 (file)
--- 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);
+}
+