#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 "uml-config.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 len);
+extern int create_tmp_file(unsigned long long len);
static void check_tmpexec(void)
{
" 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
int have_devanon = 0;
+/* Runs on boot kernel stack - already safe to use printk. */
+
void check_devanon(void)
{
int fd;