*/
#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"
#include "signal_kern.h"
-#include "signal_user.h"
#include "sysdep/ptrace.h"
#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"
#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"
if(!WIFEXITED(status) || (WEXITSTATUS(status) != exitcode)) {
int exit_with = WEXITSTATUS(status);
if (exit_with == 2)
- printk("check_ptrace : child exited with status 2. "
+ printf("check_ptrace : child exited with status 2. "
"Serious trouble happening! Try updating your "
"host skas patch!\nDisabling SYSEMU support.");
- printk("check_ptrace : child exited with exitcode %d, while "
+ printf("check_ptrace : child exited with exitcode %d, while "
"expecting %d; status 0x%x", exit_with,
exitcode, status);
if (mustpanic)
panic("\n");
else
- printk("\n");
+ printf("\n");
ret = -1;
}
}
int ptrace_faultinfo = 1;
+int ptrace_ldt = 1;
int proc_mm = 1;
+int skas_needs_stub = 0;
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)
void *stack;
int pid, n, status, count=0;
- printk("Checking syscall emulation patch for ptrace...");
+ printf("Checking syscall emulation patch for ptrace...");
sysemu_supported = 0;
pid = start_ptraced_child(&stack);
goto fail_stopped;
sysemu_supported = 1;
- printk("OK\n");
+ printf("OK\n");
set_using_sysemu(!force_sysemu_disabled);
- printk("Checking advanced syscall emulation patch for ptrace...");
+ printf("Checking advanced syscall emulation patch for ptrace...");
pid = start_ptraced_child(&stack);
if(ptrace(PTRACE_OLDSETOPTIONS, pid, 0,
goto fail_stopped;
sysemu_supported = 2;
- printk("OK\n");
+ printf("OK\n");
if ( !force_sysemu_disabled )
set_using_sysemu(sysemu_supported);
fail:
stop_ptraced_child(pid, stack, 1, 0);
fail_stopped:
- printk("missing\n");
+ printf("missing\n");
}
static void __init check_ptrace(void)
void *stack;
int pid, syscall, n, status;
- printk("Checking that ptrace can change system call numbers...");
+ printf("Checking that ptrace can change system call numbers...");
pid = start_ptraced_child(&stack);
if(ptrace(PTRACE_OLDSETOPTIONS, pid, 0, (void *)PTRACE_O_TRACESYSGOOD) < 0)
}
}
stop_ptraced_child(pid, stack, 0, 1);
- printk("OK\n");
+ printf("OK\n");
check_sysemu();
}
+extern int create_tmp_file(unsigned long 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)
" it. To support PTRACE_FAULTINFO, the host needs to be patched\n"
" using the current skas3 patch.\n\n");
+static int __init noptraceldt_cmd_param(char *str, int* add)
+{
+ ptrace_ldt = 0;
+ return 0;
+}
+
+__uml_setup("noptraceldt", noptraceldt_cmd_param,
+"noptraceldt\n"
+" Turns off usage of PTRACE_LDT, even if host supports it.\n"
+" To support PTRACE_LDT, the host needs to be patched using\n"
+" the current skas3 patch.\n\n");
+
#ifdef UML_CONFIG_MODE_SKAS
-static inline void check_skas3_ptrace_support(void)
+static inline void check_skas3_ptrace_faultinfo(void)
{
struct ptrace_faultinfo fi;
void *stack;
int pid, n;
- printf("Checking for the skas3 patch in the host...");
+ printf(" - PTRACE_FAULTINFO...");
pid = start_ptraced_child(&stack);
n = ptrace(PTRACE_FAULTINFO, pid, 0, &fi);
stop_ptraced_child(pid, stack, 1, 1);
}
-int can_do_skas(void)
+static inline void check_skas3_ptrace_ldt(void)
+{
+#ifdef PTRACE_LDT
+ void *stack;
+ int pid, n;
+ unsigned char ldtbuf[40];
+ struct ptrace_ldt ldt_op = (struct ptrace_ldt) {
+ .func = 2, /* read default ldt */
+ .ptr = ldtbuf,
+ .bytecount = sizeof(ldtbuf)};
+
+ printf(" - PTRACE_LDT...");
+ pid = start_ptraced_child(&stack);
+
+ n = ptrace(PTRACE_LDT, pid, 0, (unsigned long) &ldt_op);
+ if (n < 0) {
+ if(errno == EIO)
+ printf("not found\n");
+ else {
+ perror("not found");
+ }
+ ptrace_ldt = 0;
+ }
+ else {
+ if(ptrace_ldt)
+ printf("found\n");
+ else
+ printf("found, but use is disabled\n");
+ }
+
+ stop_ptraced_child(pid, stack, 1, 1);
+#else
+ /* PTRACE_LDT might be disabled via cmdline option.
+ * We want to override this, else we might use the stub
+ * without real need
+ */
+ ptrace_ldt = 1;
+#endif
+}
+
+static inline void check_skas3_proc_mm(void)
{
- printf("Checking for /proc/mm...");
+ printf(" - /proc/mm...");
if (os_access("/proc/mm", OS_ACC_W_OK) < 0) {
proc_mm = 0;
printf("not found\n");
else
printf("found\n");
}
+}
+
+int can_do_skas(void)
+{
+ printf("Checking for the skas3 patch in the host:\n");
+
+ check_skas3_proc_mm();
+ check_skas3_ptrace_faultinfo();
+ check_skas3_ptrace_ldt();
+
+ if(!proc_mm || !ptrace_faultinfo || !ptrace_ldt)
+ skas_needs_stub = 1;
- check_skas3_ptrace_support();
return 1;
}
#else
return(0);
}
#endif
+
+int have_devanon = 0;
+
+/* Runs on boot kernel stack - already safe to use printk. */
+
+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);
+}
+
git.openpandora.org / pandora-kernel.git / blobdiff