#include "linux/smp_lock.h"
#include "linux/security.h"
#include "linux/ptrace.h"
+#include "linux/audit.h"
#ifdef CONFIG_PROC_MM
#include "linux/proc_mm.h"
#endif
#include "asm/ptrace.h"
#include "asm/uaccess.h"
#include "kern_util.h"
-#include "ptrace_user.h"
+#include "skas_ptrace.h"
+#include "sysdep/ptrace.h"
+
+static inline void set_singlestepping(struct task_struct *child, int on)
+{
+ if (on)
+ child->ptrace |= PT_DTRACE;
+ else
+ child->ptrace &= ~PT_DTRACE;
+ child->thread.singlestep_syscall = 0;
+
+#ifdef SUBARCH_SET_SINGLESTEPPING
+ SUBARCH_SET_SINGLESTEPPING(child, on);
+#endif
+}
/*
* Called by kernel/ptrace.c when detaching..
*/
void ptrace_disable(struct task_struct *child)
{
+ set_singlestepping(child,0);
}
-int sys_ptrace(long request, long pid, long addr, long data)
+extern int peek_user(struct task_struct * child, long addr, long data);
+extern int poke_user(struct task_struct * child, long addr, long data);
+
+long arch_ptrace(struct task_struct *child, long request, long addr, long data)
{
- struct task_struct *child;
int i, ret;
-
- lock_kernel();
- ret = -EPERM;
- if (request == PTRACE_TRACEME) {
- /* are we already being traced? */
- if (current->ptrace & PT_PTRACED)
- goto out;
-
- ret = security_ptrace(current->parent, current);
- if (ret)
- goto out;
-
- /* set the ptrace bit in the process flags. */
- current->ptrace |= PT_PTRACED;
- ret = 0;
- goto out;
- }
- ret = -ESRCH;
- read_lock(&tasklist_lock);
- child = find_task_by_pid(pid);
- if (child)
- get_task_struct(child);
- read_unlock(&tasklist_lock);
- if (!child)
- goto out;
- if (!vx_check(vx_task_xid(child), VX_WATCH|VX_IDENT))
- goto out_tsk;
-
- ret = -EPERM;
- if (pid == 1) /* you may not mess with init */
- goto out_tsk;
-
- if (request == PTRACE_ATTACH) {
- ret = ptrace_attach(child);
- goto out_tsk;
- }
-
- ret = ptrace_check_attach(child, request == PTRACE_KILL);
- if (ret < 0)
- goto out_tsk;
+ unsigned long __user *p = (void __user *)(unsigned long)data;
switch (request) {
/* when I and D space are separate, these will need to be fixed. */
copied = access_process_vm(child, addr, &tmp, sizeof(tmp), 0);
if (copied != sizeof(tmp))
break;
- ret = put_user(tmp,(unsigned long *) data);
+ ret = put_user(tmp, p);
break;
}
/* read the word at location addr in the USER area. */
- case PTRACE_PEEKUSR: {
- unsigned long tmp;
-
- ret = -EIO;
- if ((addr & 3) || addr < 0)
- break;
-
- tmp = 0; /* Default return condition */
- if(addr < FRAME_SIZE_OFFSET){
- tmp = getreg(child, addr);
- }
- else if((addr >= offsetof(struct user, u_debugreg[0])) &&
- (addr <= offsetof(struct user, u_debugreg[7]))){
- addr -= offsetof(struct user, u_debugreg[0]);
- addr = addr >> 2;
- tmp = child->thread.arch.debugregs[addr];
- }
- ret = put_user(tmp, (unsigned long *) data);
- break;
- }
+ case PTRACE_PEEKUSR:
+ ret = peek_user(child, addr, data);
+ break;
/* when I and D space are separate, this will have to be fixed. */
case PTRACE_POKETEXT: /* write the word at location addr. */
break;
case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
- ret = -EIO;
- if ((addr & 3) || addr < 0)
- break;
-
- if (addr < FRAME_SIZE_OFFSET) {
- ret = putreg(child, addr, data);
- break;
- }
- else if((addr >= offsetof(struct user, u_debugreg[0])) &&
- (addr <= offsetof(struct user, u_debugreg[7]))){
- addr -= offsetof(struct user, u_debugreg[0]);
- addr = addr >> 2;
- if((addr == 4) || (addr == 5)) break;
- child->thread.arch.debugregs[addr] = data;
- ret = 0;
- }
-
- break;
+ ret = poke_user(child, addr, data);
+ break;
case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */
case PTRACE_CONT: { /* restart after signal. */
ret = -EIO;
- if ((unsigned long) data > _NSIG)
+ if (!valid_signal(data))
break;
+
+ set_singlestepping(child, 0);
if (request == PTRACE_SYSCALL) {
set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
}
*/
case PTRACE_KILL: {
ret = 0;
- if (child->state == TASK_ZOMBIE) /* already dead */
+ if (child->exit_state == EXIT_ZOMBIE) /* already dead */
break;
+
+ set_singlestepping(child, 0);
child->exit_code = SIGKILL;
wake_up_process(child);
break;
case PTRACE_SINGLESTEP: { /* set the trap flag. */
ret = -EIO;
- if ((unsigned long) data > _NSIG)
+ if (!valid_signal(data))
break;
clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
- child->ptrace |= PT_DTRACE;
+ set_singlestepping(child, 1);
child->exit_code = data;
/* give it a chance to run. */
wake_up_process(child);
#ifdef PTRACE_GETREGS
case PTRACE_GETREGS: { /* Get all gp regs from the child. */
- if (!access_ok(VERIFY_WRITE, (unsigned long *)data,
- FRAME_SIZE_OFFSET)) {
+ if (!access_ok(VERIFY_WRITE, p, MAX_REG_OFFSET)) {
ret = -EIO;
break;
}
- for ( i = 0; i < FRAME_SIZE_OFFSET; i += sizeof(long) ) {
- __put_user(getreg(child, i), (unsigned long *) data);
- data += sizeof(long);
+ for ( i = 0; i < MAX_REG_OFFSET; i += sizeof(long) ) {
+ __put_user(getreg(child, i), p);
+ p++;
}
ret = 0;
break;
#ifdef PTRACE_SETREGS
case PTRACE_SETREGS: { /* Set all gp regs in the child. */
unsigned long tmp = 0;
- if (!access_ok(VERIFY_READ, (unsigned *)data,
- FRAME_SIZE_OFFSET)) {
+ if (!access_ok(VERIFY_READ, p, MAX_REG_OFFSET)) {
ret = -EIO;
break;
}
- for ( i = 0; i < FRAME_SIZE_OFFSET; i += sizeof(long) ) {
- __get_user(tmp, (unsigned long *) data);
+ for ( i = 0; i < MAX_REG_OFFSET; i += sizeof(long) ) {
+ __get_user(tmp, p);
putreg(child, i, tmp);
- data += sizeof(long);
+ p++;
}
ret = 0;
break;
ret = set_fpxregs(data, child);
break;
#endif
- case PTRACE_FAULTINFO: {
- struct ptrace_faultinfo fault;
+ case PTRACE_GET_THREAD_AREA:
+ ret = ptrace_get_thread_area(child, addr,
+ (struct user_desc __user *) data);
+ break;
+
+ case PTRACE_SET_THREAD_AREA:
+ ret = ptrace_set_thread_area(child, addr,
+ (struct user_desc __user *) data);
+ break;
- fault = ((struct ptrace_faultinfo)
- { .is_write = child->thread.err,
- .addr = child->thread.cr2 });
- ret = copy_to_user((unsigned long *) data, &fault,
- sizeof(fault));
+ case PTRACE_FAULTINFO: {
+ /* Take the info from thread->arch->faultinfo,
+ * but transfer max. sizeof(struct ptrace_faultinfo).
+ * On i386, ptrace_faultinfo is smaller!
+ */
+ ret = copy_to_user(p, &child->thread.arch.faultinfo,
+ sizeof(struct ptrace_faultinfo));
if(ret)
break;
break;
}
- case PTRACE_SIGPENDING:
- ret = copy_to_user((unsigned long *) data,
- &child->pending.signal,
- sizeof(child->pending.signal));
- break;
+#ifdef PTRACE_LDT
case PTRACE_LDT: {
struct ptrace_ldt ldt;
- if(copy_from_user(&ldt, (unsigned long *) data,
- sizeof(ldt))){
+ if(copy_from_user(&ldt, p, sizeof(ldt))){
ret = -EIO;
break;
}
ret = -EIO;
break;
}
+#endif
#ifdef CONFIG_PROC_MM
case PTRACE_SWITCH_MM: {
struct mm_struct *old = child->mm;
ret = ptrace_request(child, request, addr, data);
break;
}
- out_tsk:
- put_task_struct(child);
- out:
- unlock_kernel();
+
return ret;
}
+void send_sigtrap(struct task_struct *tsk, union uml_pt_regs *regs,
+ int error_code)
+{
+ struct siginfo info;
+
+ memset(&info, 0, sizeof(info));
+ info.si_signo = SIGTRAP;
+ info.si_code = TRAP_BRKPT;
+
+ /* User-mode eip? */
+ info.si_addr = UPT_IS_USER(regs) ? (void __user *) UPT_IP(regs) : NULL;
+
+ /* Send us the fakey SIGTRAP */
+ force_sig_info(SIGTRAP, &info, tsk);
+}
+
+/* XXX Check PT_DTRACE vs TIF_SINGLESTEP for singlestepping check and
+ * PT_PTRACED vs TIF_SYSCALL_TRACE for syscall tracing check
+ */
void syscall_trace(union uml_pt_regs *regs, int entryexit)
{
+ int is_singlestep = (current->ptrace & PT_DTRACE) && entryexit;
+ int tracesysgood;
+
if (unlikely(current->audit_context)) {
if (!entryexit)
- audit_syscall_entry(current, regs->orig_eax,
- regs->ebx, regs->ecx,
- regs->edx, regs->esi);
- else
- audit_syscall_exit(current, regs->eax);
+ audit_syscall_entry(HOST_AUDIT_ARCH,
+ UPT_SYSCALL_NR(regs),
+ UPT_SYSCALL_ARG1(regs),
+ UPT_SYSCALL_ARG2(regs),
+ UPT_SYSCALL_ARG3(regs),
+ UPT_SYSCALL_ARG4(regs));
+ else audit_syscall_exit(AUDITSC_RESULT(UPT_SYSCALL_RET(regs)),
+ UPT_SYSCALL_RET(regs));
}
+ /* Fake a debug trap */
+ if (is_singlestep)
+ send_sigtrap(current, regs, 0);
+
if (!test_thread_flag(TIF_SYSCALL_TRACE))
return;
+
if (!(current->ptrace & PT_PTRACED))
return;
/* the 0x80 provides a way for the tracing parent to distinguish
between a syscall stop and SIGTRAP delivery */
- ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
- ? 0x80 : 0));
+ tracesysgood = (current->ptrace & PT_TRACESYSGOOD);
+ ptrace_notify(SIGTRAP | (tracesysgood ? 0x80 : 0));
+
+ if (entryexit) /* force do_signal() --> is_syscall() */
+ set_thread_flag(TIF_SIGPENDING);
- /*
- * this isn't the same as continuing with a signal, but it will do
+ /* this isn't the same as continuing with a signal, but it will do
* for normal use. strace only continues with a signal if the
* stopping signal is not SIGTRAP. -brl
*/
current->exit_code = 0;
}
}
-
-/*
- * 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:
- */
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