#include "linux/linkage.h"
#include "linux/slab.h"
#include "linux/shm.h"
+#include "linux/utsname.h"
+#include "linux/personality.h"
#include "asm/uaccess.h"
#define __FRAME_OFFSETS
#include "asm/ptrace.h"
#include "asm/unistd.h"
#include "asm/prctl.h" /* XXX This should get the constants from libc */
#include "choose-mode.h"
+#include "kern.h"
+#include "os.h"
-asmlinkage long wrap_sys_shmat(int shmid, char __user *shmaddr, int shmflg)
+asmlinkage long sys_uname64(struct new_utsname __user * name)
{
- unsigned long raddr;
-
- return do_shmat(shmid, shmaddr, shmflg, &raddr) ?: (long) raddr;
-}
-
-#ifdef CONFIG_MODE_TT
-extern int modify_ldt(int func, void *ptr, unsigned long bytecount);
-
-long sys_modify_ldt_tt(int func, void *ptr, unsigned long bytecount)
-{
- /* XXX This should check VERIFY_WRITE depending on func, check this
- * in i386 as well.
- */
- if(verify_area(VERIFY_READ, ptr, bytecount))
- return(-EFAULT);
- return(modify_ldt(func, ptr, bytecount));
-}
-#endif
-
-#ifdef CONFIG_MODE_SKAS
-extern int userspace_pid;
-
-#ifndef __NR_mm_indirect
-#define __NR_mm_indirect 241
-#endif
-
-long sys_modify_ldt_skas(int func, void *ptr, unsigned long bytecount)
-{
- unsigned long args[6];
- void *buf;
- int res, n;
-
- buf = kmalloc(bytecount, GFP_KERNEL);
- if(buf == NULL)
- return(-ENOMEM);
-
- res = 0;
-
- switch(func){
- case 1:
- case 0x11:
- res = copy_from_user(buf, ptr, bytecount);
- break;
- }
-
- if(res != 0){
- res = -EFAULT;
- goto out;
- }
-
- args[0] = func;
- args[1] = (unsigned long) buf;
- args[2] = bytecount;
- res = syscall(__NR_mm_indirect, ¤t->mm->context.u,
- __NR_modify_ldt, args);
-
- if(res < 0)
- goto out;
-
- switch(func){
- case 0:
- case 2:
- n = res;
- res = copy_to_user(ptr, buf, n);
- if(res != 0)
- res = -EFAULT;
- else
- res = n;
- break;
- }
-
- out:
- kfree(buf);
- return(res);
-}
-#endif
-
-long sys_modify_ldt(int func, void *ptr, unsigned long bytecount)
-{
- return(CHOOSE_MODE_PROC(sys_modify_ldt_tt, sys_modify_ldt_skas, func,
- ptr, bytecount));
+ int err;
+ down_read(&uts_sem);
+ err = copy_to_user(name, utsname(), sizeof (*name));
+ up_read(&uts_sem);
+ if (personality(current->personality) == PER_LINUX32)
+ err |= copy_to_user(&name->machine, "i686", 5);
+ return err ? -EFAULT : 0;
}
#ifdef CONFIG_MODE_TT
case ARCH_GET_GS:
ret = arch_prctl(code, (unsigned long) &tmp);
if(!ret)
- ret = put_user(tmp, &addr);
+ ret = put_user(tmp, (long __user *)addr);
break;
default:
ret = -EINVAL;
#ifdef CONFIG_MODE_SKAS
-static long arch_prctl_skas(int code, unsigned long addr)
+static long arch_prctl_skas(int code, unsigned long __user *addr)
{
- long ret = 0;
-
+ unsigned long *ptr = addr, tmp;
+ long ret;
+ int pid = current->mm->context.skas.id.u.pid;
+
+ /*
+ * With ARCH_SET_FS (and ARCH_SET_GS is treated similarly to
+ * be safe), we need to call arch_prctl on the host because
+ * setting %fs may result in something else happening (like a
+ * GDT being set instead). So, we let the host fiddle the
+ * registers and restore them afterwards.
+ *
+ * So, the saved registers are stored to the process (this
+ * needed because a stub may have been the last thing to run),
+ * arch_prctl is run on the host, then the registers are read
+ * back.
+ */
switch(code){
+ case ARCH_SET_FS:
case ARCH_SET_GS:
- current->thread.regs.regs.skas.regs[GS_BASE / sizeof(unsigned long)] = addr;
+ restore_registers(pid, ¤t->thread.regs.regs);
break;
+ case ARCH_GET_FS:
+ case ARCH_GET_GS:
+ /*
+ * With these two, we read to a local pointer and
+ * put_user it to the userspace pointer that we were
+ * given. If addr isn't valid (because it hasn't been
+ * faulted in or is just bogus), we want put_user to
+ * fault it in (or return -EFAULT) instead of having
+ * the host return -EFAULT.
+ */
+ ptr = &tmp;
+ }
+
+ ret = os_arch_prctl(pid, code, ptr);
+ if(ret)
+ return ret;
+
+ switch(code){
case ARCH_SET_FS:
- current->thread.regs.regs.skas.regs[FS_BASE / sizeof(unsigned long)] = addr;
+ current->thread.arch.fs = (unsigned long) ptr;
+ save_registers(pid, ¤t->thread.regs.regs);
+ break;
+ case ARCH_SET_GS:
+ save_registers(pid, ¤t->thread.regs.regs);
break;
case ARCH_GET_FS:
- ret = put_user(current->thread.regs.regs.skas.regs[GS / sizeof(unsigned long)], &addr);
- break;
+ ret = put_user(tmp, addr);
+ break;
case ARCH_GET_GS:
- ret = put_user(current->thread.regs.regs.skas.regs[FS / sizeof(unsigned \
-long)], &addr);
- break;
- default:
- ret = -EINVAL;
+ ret = put_user(tmp, addr);
break;
}
- return(ret);
+ return ret;
}
#endif
long sys_arch_prctl(int code, unsigned long addr)
{
- return(CHOOSE_MODE_PROC(arch_prctl_tt, arch_prctl_skas, code, addr));
+ return CHOOSE_MODE_PROC(arch_prctl_tt, arch_prctl_skas, code,
+ (unsigned long __user *) addr);
}
long sys_clone(unsigned long clone_flags, unsigned long newsp,
{
long ret;
- /* XXX: normal arch do here this pass, and also pass the regs to
- * do_fork, instead of NULL. Currently the arch-independent code
- * ignores these values, while the UML code (actually it's
- * copy_thread) does the right thing. But this should change,
- probably. */
- /*if (!newsp)
- newsp = UPT_SP(current->thread.regs);*/
+ if (!newsp)
+ newsp = UPT_SP(¤t->thread.regs.regs);
current->thread.forking = 1;
- ret = do_fork(clone_flags, newsp, NULL, 0, parent_tid, child_tid);
+ ret = do_fork(clone_flags, newsp, ¤t->thread.regs, 0, parent_tid,
+ child_tid);
current->thread.forking = 0;
- return(ret);
+ return ret;
+}
+
+void arch_switch_to_skas(struct task_struct *from, struct task_struct *to)
+{
+ if((to->thread.arch.fs == 0) || (to->mm == NULL))
+ return;
+
+ arch_prctl_skas(ARCH_SET_FS, (void __user *) to->thread.arch.fs);
}
-/*
- * Overrides for Emacs so that we follow Linus's tabbing style.
- * Emacs will notice this stuff at the end of the file and automatically
- * adjust the settings for this buffer only. This must remain at the end
- * of the file.
- * ---------------------------------------------------------------------------
- * Local variables:
- * c-file-style: "linux"
- * End:
- */
git://git.onelab.eu / linux-2.6.git / blobdiff