678 lines
17 KiB
C
678 lines
17 KiB
C
/* ptrace.c: Sparc process tracing support.
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*
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* Copyright (C) 1996 David S. Miller (davem@caipfs.rutgers.edu)
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* Copyright (C) 1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
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*
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* Based upon code written by Ross Biro, Linus Torvalds, Bob Manson,
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* and David Mosberger.
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*
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* Added Linux support -miguel (weird, eh?, the original code was meant
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* to emulate SunOS).
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*/
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include <linux/errno.h>
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#include <linux/ptrace.h>
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#include <linux/user.h>
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#include <linux/smp.h>
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#include <linux/smp_lock.h>
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#include <linux/security.h>
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#include <linux/seccomp.h>
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#include <linux/audit.h>
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#include <linux/signal.h>
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#include <asm/asi.h>
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#include <asm/pgtable.h>
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#include <asm/system.h>
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#include <asm/uaccess.h>
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#include <asm/psrcompat.h>
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#include <asm/visasm.h>
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#include <asm/spitfire.h>
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/* Returning from ptrace is a bit tricky because the syscall return
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* low level code assumes any value returned which is negative and
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* is a valid errno will mean setting the condition codes to indicate
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* an error return. This doesn't work, so we have this hook.
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*/
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static inline void pt_error_return(struct pt_regs *regs, unsigned long error)
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{
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regs->u_regs[UREG_I0] = error;
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regs->tstate |= (TSTATE_ICARRY | TSTATE_XCARRY);
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regs->tpc = regs->tnpc;
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regs->tnpc += 4;
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}
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static inline void pt_succ_return(struct pt_regs *regs, unsigned long value)
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{
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regs->u_regs[UREG_I0] = value;
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regs->tstate &= ~(TSTATE_ICARRY | TSTATE_XCARRY);
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regs->tpc = regs->tnpc;
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regs->tnpc += 4;
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}
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static inline void
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pt_succ_return_linux(struct pt_regs *regs, unsigned long value, void __user *addr)
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{
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if (test_thread_flag(TIF_32BIT)) {
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if (put_user(value, (unsigned int __user *) addr)) {
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pt_error_return(regs, EFAULT);
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return;
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}
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} else {
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if (put_user(value, (long __user *) addr)) {
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pt_error_return(regs, EFAULT);
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return;
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}
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}
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regs->u_regs[UREG_I0] = 0;
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regs->tstate &= ~(TSTATE_ICARRY | TSTATE_XCARRY);
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regs->tpc = regs->tnpc;
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regs->tnpc += 4;
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}
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static void
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pt_os_succ_return (struct pt_regs *regs, unsigned long val, void __user *addr)
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{
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if (current->personality == PER_SUNOS)
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pt_succ_return (regs, val);
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else
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pt_succ_return_linux (regs, val, addr);
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}
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/* #define ALLOW_INIT_TRACING */
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/* #define DEBUG_PTRACE */
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#ifdef DEBUG_PTRACE
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char *pt_rq [] = {
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/* 0 */ "TRACEME", "PEEKTEXT", "PEEKDATA", "PEEKUSR",
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/* 4 */ "POKETEXT", "POKEDATA", "POKEUSR", "CONT",
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/* 8 */ "KILL", "SINGLESTEP", "SUNATTACH", "SUNDETACH",
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/* 12 */ "GETREGS", "SETREGS", "GETFPREGS", "SETFPREGS",
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/* 16 */ "READDATA", "WRITEDATA", "READTEXT", "WRITETEXT",
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/* 20 */ "GETFPAREGS", "SETFPAREGS", "unknown", "unknown",
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/* 24 */ "SYSCALL", ""
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};
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#endif
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/*
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* Called by kernel/ptrace.c when detaching..
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*
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* Make sure single step bits etc are not set.
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*/
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void ptrace_disable(struct task_struct *child)
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{
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/* nothing to do */
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}
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/* To get the necessary page struct, access_process_vm() first calls
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* get_user_pages(). This has done a flush_dcache_page() on the
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* accessed page. Then our caller (copy_{to,from}_user_page()) did
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* to memcpy to read/write the data from that page.
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*
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* Now, the only thing we have to do is:
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* 1) flush the D-cache if it's possible than an illegal alias
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* has been created
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* 2) flush the I-cache if this is pre-cheetah and we did a write
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*/
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void flush_ptrace_access(struct vm_area_struct *vma, struct page *page,
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unsigned long uaddr, void *kaddr,
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unsigned long len, int write)
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{
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BUG_ON(len > PAGE_SIZE);
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#ifdef DCACHE_ALIASING_POSSIBLE
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/* If bit 13 of the kernel address we used to access the
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* user page is the same as the virtual address that page
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* is mapped to in the user's address space, we can skip the
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* D-cache flush.
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*/
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if ((uaddr ^ kaddr) & (1UL << 13)) {
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unsigned long start = __pa(kaddr);
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unsigned long end = start + len;
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if (tlb_type == spitfire) {
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for (; start < end; start += 32)
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spitfire_put_dcache_tag(va & 0x3fe0, 0x0);
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} else {
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for (; start < end; start += 32)
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__asm__ __volatile__(
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"stxa %%g0, [%0] %1\n\t"
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"membar #Sync"
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: /* no outputs */
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: "r" (va),
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"i" (ASI_DCACHE_INVALIDATE));
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}
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}
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#endif
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if (write && tlb_type == spitfire) {
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unsigned long start = (unsigned long) kaddr;
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unsigned long end = start + len;
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for (; start < end; start += 32)
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flushi(start);
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}
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}
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asmlinkage void do_ptrace(struct pt_regs *regs)
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{
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int request = regs->u_regs[UREG_I0];
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pid_t pid = regs->u_regs[UREG_I1];
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unsigned long addr = regs->u_regs[UREG_I2];
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unsigned long data = regs->u_regs[UREG_I3];
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unsigned long addr2 = regs->u_regs[UREG_I4];
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struct task_struct *child;
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int ret;
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if (test_thread_flag(TIF_32BIT)) {
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addr &= 0xffffffffUL;
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data &= 0xffffffffUL;
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addr2 &= 0xffffffffUL;
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}
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lock_kernel();
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#ifdef DEBUG_PTRACE
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{
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char *s;
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if ((request >= 0) && (request <= 24))
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s = pt_rq [request];
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else
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s = "unknown";
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if (request == PTRACE_POKEDATA && data == 0x91d02001){
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printk ("do_ptrace: breakpoint pid=%d, addr=%016lx addr2=%016lx\n",
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pid, addr, addr2);
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} else
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printk("do_ptrace: rq=%s(%d) pid=%d addr=%016lx data=%016lx addr2=%016lx\n",
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s, request, pid, addr, data, addr2);
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}
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#endif
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if (request == PTRACE_TRACEME) {
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int ret;
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/* are we already being traced? */
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if (current->ptrace & PT_PTRACED) {
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pt_error_return(regs, EPERM);
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goto out;
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}
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ret = security_ptrace(current->parent, current);
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if (ret) {
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pt_error_return(regs, -ret);
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goto out;
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}
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/* set the ptrace bit in the process flags. */
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current->ptrace |= PT_PTRACED;
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pt_succ_return(regs, 0);
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goto out;
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}
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#ifndef ALLOW_INIT_TRACING
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if (pid == 1) {
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/* Can't dork with init. */
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pt_error_return(regs, EPERM);
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goto out;
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}
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#endif
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read_lock(&tasklist_lock);
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child = find_task_by_pid(pid);
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if (child)
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get_task_struct(child);
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read_unlock(&tasklist_lock);
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if (!child) {
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pt_error_return(regs, ESRCH);
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goto out;
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}
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if ((current->personality == PER_SUNOS && request == PTRACE_SUNATTACH)
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|| (current->personality != PER_SUNOS && request == PTRACE_ATTACH)) {
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if (ptrace_attach(child)) {
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pt_error_return(regs, EPERM);
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goto out_tsk;
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}
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pt_succ_return(regs, 0);
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goto out_tsk;
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}
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ret = ptrace_check_attach(child, request == PTRACE_KILL);
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if (ret < 0) {
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pt_error_return(regs, -ret);
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goto out_tsk;
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}
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if (!(test_thread_flag(TIF_32BIT)) &&
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((request == PTRACE_READDATA64) ||
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(request == PTRACE_WRITEDATA64) ||
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(request == PTRACE_READTEXT64) ||
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(request == PTRACE_WRITETEXT64) ||
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(request == PTRACE_PEEKTEXT64) ||
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(request == PTRACE_POKETEXT64) ||
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(request == PTRACE_PEEKDATA64) ||
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(request == PTRACE_POKEDATA64))) {
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addr = regs->u_regs[UREG_G2];
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addr2 = regs->u_regs[UREG_G3];
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request -= 30; /* wheee... */
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}
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switch(request) {
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case PTRACE_PEEKTEXT: /* read word at location addr. */
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case PTRACE_PEEKDATA: {
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unsigned long tmp64;
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unsigned int tmp32;
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int res, copied;
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res = -EIO;
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if (test_thread_flag(TIF_32BIT)) {
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copied = access_process_vm(child, addr,
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&tmp32, sizeof(tmp32), 0);
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tmp64 = (unsigned long) tmp32;
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if (copied == sizeof(tmp32))
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res = 0;
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} else {
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copied = access_process_vm(child, addr,
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&tmp64, sizeof(tmp64), 0);
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if (copied == sizeof(tmp64))
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res = 0;
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}
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if (res < 0)
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pt_error_return(regs, -res);
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else
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pt_os_succ_return(regs, tmp64, (void __user *) data);
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goto out_tsk;
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}
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case PTRACE_POKETEXT: /* write the word at location addr. */
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case PTRACE_POKEDATA: {
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unsigned long tmp64;
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unsigned int tmp32;
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int copied, res = -EIO;
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if (test_thread_flag(TIF_32BIT)) {
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tmp32 = data;
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copied = access_process_vm(child, addr,
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&tmp32, sizeof(tmp32), 1);
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if (copied == sizeof(tmp32))
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res = 0;
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} else {
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tmp64 = data;
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copied = access_process_vm(child, addr,
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&tmp64, sizeof(tmp64), 1);
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if (copied == sizeof(tmp64))
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res = 0;
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}
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if (res < 0)
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pt_error_return(regs, -res);
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else
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pt_succ_return(regs, res);
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goto out_tsk;
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}
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case PTRACE_GETREGS: {
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struct pt_regs32 __user *pregs =
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(struct pt_regs32 __user *) addr;
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struct pt_regs *cregs = child->thread_info->kregs;
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int rval;
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if (__put_user(tstate_to_psr(cregs->tstate), (&pregs->psr)) ||
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__put_user(cregs->tpc, (&pregs->pc)) ||
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__put_user(cregs->tnpc, (&pregs->npc)) ||
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__put_user(cregs->y, (&pregs->y))) {
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pt_error_return(regs, EFAULT);
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goto out_tsk;
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}
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for (rval = 1; rval < 16; rval++)
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if (__put_user(cregs->u_regs[rval], (&pregs->u_regs[rval - 1]))) {
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pt_error_return(regs, EFAULT);
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goto out_tsk;
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}
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pt_succ_return(regs, 0);
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#ifdef DEBUG_PTRACE
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printk ("PC=%lx nPC=%lx o7=%lx\n", cregs->tpc, cregs->tnpc, cregs->u_regs [15]);
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#endif
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goto out_tsk;
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}
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case PTRACE_GETREGS64: {
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struct pt_regs __user *pregs = (struct pt_regs __user *) addr;
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struct pt_regs *cregs = child->thread_info->kregs;
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unsigned long tpc = cregs->tpc;
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int rval;
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if ((child->thread_info->flags & _TIF_32BIT) != 0)
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tpc &= 0xffffffff;
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if (__put_user(cregs->tstate, (&pregs->tstate)) ||
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__put_user(tpc, (&pregs->tpc)) ||
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__put_user(cregs->tnpc, (&pregs->tnpc)) ||
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__put_user(cregs->y, (&pregs->y))) {
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pt_error_return(regs, EFAULT);
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goto out_tsk;
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}
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for (rval = 1; rval < 16; rval++)
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if (__put_user(cregs->u_regs[rval], (&pregs->u_regs[rval - 1]))) {
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pt_error_return(regs, EFAULT);
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goto out_tsk;
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}
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pt_succ_return(regs, 0);
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#ifdef DEBUG_PTRACE
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printk ("PC=%lx nPC=%lx o7=%lx\n", cregs->tpc, cregs->tnpc, cregs->u_regs [15]);
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#endif
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goto out_tsk;
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}
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case PTRACE_SETREGS: {
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struct pt_regs32 __user *pregs =
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(struct pt_regs32 __user *) addr;
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struct pt_regs *cregs = child->thread_info->kregs;
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unsigned int psr, pc, npc, y;
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int i;
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/* Must be careful, tracing process can only set certain
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* bits in the psr.
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*/
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if (__get_user(psr, (&pregs->psr)) ||
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__get_user(pc, (&pregs->pc)) ||
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__get_user(npc, (&pregs->npc)) ||
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__get_user(y, (&pregs->y))) {
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pt_error_return(regs, EFAULT);
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goto out_tsk;
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}
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cregs->tstate &= ~(TSTATE_ICC);
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cregs->tstate |= psr_to_tstate_icc(psr);
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if (!((pc | npc) & 3)) {
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cregs->tpc = pc;
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cregs->tnpc = npc;
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}
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cregs->y = y;
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for (i = 1; i < 16; i++) {
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if (__get_user(cregs->u_regs[i], (&pregs->u_regs[i-1]))) {
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pt_error_return(regs, EFAULT);
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goto out_tsk;
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}
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}
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pt_succ_return(regs, 0);
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goto out_tsk;
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}
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case PTRACE_SETREGS64: {
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struct pt_regs __user *pregs = (struct pt_regs __user *) addr;
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struct pt_regs *cregs = child->thread_info->kregs;
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unsigned long tstate, tpc, tnpc, y;
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int i;
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/* Must be careful, tracing process can only set certain
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* bits in the psr.
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*/
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if (__get_user(tstate, (&pregs->tstate)) ||
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__get_user(tpc, (&pregs->tpc)) ||
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__get_user(tnpc, (&pregs->tnpc)) ||
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__get_user(y, (&pregs->y))) {
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pt_error_return(regs, EFAULT);
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goto out_tsk;
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}
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if ((child->thread_info->flags & _TIF_32BIT) != 0) {
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tpc &= 0xffffffff;
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tnpc &= 0xffffffff;
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}
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tstate &= (TSTATE_ICC | TSTATE_XCC);
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cregs->tstate &= ~(TSTATE_ICC | TSTATE_XCC);
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cregs->tstate |= tstate;
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if (!((tpc | tnpc) & 3)) {
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cregs->tpc = tpc;
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cregs->tnpc = tnpc;
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}
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cregs->y = y;
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for (i = 1; i < 16; i++) {
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if (__get_user(cregs->u_regs[i], (&pregs->u_regs[i-1]))) {
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pt_error_return(regs, EFAULT);
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goto out_tsk;
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}
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}
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pt_succ_return(regs, 0);
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goto out_tsk;
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}
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case PTRACE_GETFPREGS: {
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struct fps {
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unsigned int regs[32];
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unsigned int fsr;
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unsigned int flags;
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unsigned int extra;
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unsigned int fpqd;
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struct fq {
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unsigned int insnaddr;
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unsigned int insn;
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} fpq[16];
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};
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struct fps __user *fps = (struct fps __user *) addr;
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unsigned long *fpregs = child->thread_info->fpregs;
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if (copy_to_user(&fps->regs[0], fpregs,
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(32 * sizeof(unsigned int))) ||
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__put_user(child->thread_info->xfsr[0], (&fps->fsr)) ||
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__put_user(0, (&fps->fpqd)) ||
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__put_user(0, (&fps->flags)) ||
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__put_user(0, (&fps->extra)) ||
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clear_user(&fps->fpq[0], 32 * sizeof(unsigned int))) {
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pt_error_return(regs, EFAULT);
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goto out_tsk;
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}
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pt_succ_return(regs, 0);
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goto out_tsk;
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}
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case PTRACE_GETFPREGS64: {
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struct fps {
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unsigned int regs[64];
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unsigned long fsr;
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};
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struct fps __user *fps = (struct fps __user *) addr;
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unsigned long *fpregs = child->thread_info->fpregs;
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if (copy_to_user(&fps->regs[0], fpregs,
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(64 * sizeof(unsigned int))) ||
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__put_user(child->thread_info->xfsr[0], (&fps->fsr))) {
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pt_error_return(regs, EFAULT);
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goto out_tsk;
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}
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pt_succ_return(regs, 0);
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goto out_tsk;
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}
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case PTRACE_SETFPREGS: {
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struct fps {
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unsigned int regs[32];
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unsigned int fsr;
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unsigned int flags;
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unsigned int extra;
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unsigned int fpqd;
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struct fq {
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unsigned int insnaddr;
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unsigned int insn;
|
|
} fpq[16];
|
|
};
|
|
struct fps __user *fps = (struct fps __user *) addr;
|
|
unsigned long *fpregs = child->thread_info->fpregs;
|
|
unsigned fsr;
|
|
|
|
if (copy_from_user(fpregs, &fps->regs[0],
|
|
(32 * sizeof(unsigned int))) ||
|
|
__get_user(fsr, (&fps->fsr))) {
|
|
pt_error_return(regs, EFAULT);
|
|
goto out_tsk;
|
|
}
|
|
child->thread_info->xfsr[0] &= 0xffffffff00000000UL;
|
|
child->thread_info->xfsr[0] |= fsr;
|
|
if (!(child->thread_info->fpsaved[0] & FPRS_FEF))
|
|
child->thread_info->gsr[0] = 0;
|
|
child->thread_info->fpsaved[0] |= (FPRS_FEF | FPRS_DL);
|
|
pt_succ_return(regs, 0);
|
|
goto out_tsk;
|
|
}
|
|
|
|
case PTRACE_SETFPREGS64: {
|
|
struct fps {
|
|
unsigned int regs[64];
|
|
unsigned long fsr;
|
|
};
|
|
struct fps __user *fps = (struct fps __user *) addr;
|
|
unsigned long *fpregs = child->thread_info->fpregs;
|
|
|
|
if (copy_from_user(fpregs, &fps->regs[0],
|
|
(64 * sizeof(unsigned int))) ||
|
|
__get_user(child->thread_info->xfsr[0], (&fps->fsr))) {
|
|
pt_error_return(regs, EFAULT);
|
|
goto out_tsk;
|
|
}
|
|
if (!(child->thread_info->fpsaved[0] & FPRS_FEF))
|
|
child->thread_info->gsr[0] = 0;
|
|
child->thread_info->fpsaved[0] |= (FPRS_FEF | FPRS_DL | FPRS_DU);
|
|
pt_succ_return(regs, 0);
|
|
goto out_tsk;
|
|
}
|
|
|
|
case PTRACE_READTEXT:
|
|
case PTRACE_READDATA: {
|
|
int res = ptrace_readdata(child, addr,
|
|
(char __user *)addr2, data);
|
|
if (res == data) {
|
|
pt_succ_return(regs, 0);
|
|
goto out_tsk;
|
|
}
|
|
if (res >= 0)
|
|
res = -EIO;
|
|
pt_error_return(regs, -res);
|
|
goto out_tsk;
|
|
}
|
|
|
|
case PTRACE_WRITETEXT:
|
|
case PTRACE_WRITEDATA: {
|
|
int res = ptrace_writedata(child, (char __user *) addr2,
|
|
addr, data);
|
|
if (res == data) {
|
|
pt_succ_return(regs, 0);
|
|
goto out_tsk;
|
|
}
|
|
if (res >= 0)
|
|
res = -EIO;
|
|
pt_error_return(regs, -res);
|
|
goto out_tsk;
|
|
}
|
|
case PTRACE_SYSCALL: /* continue and stop at (return from) syscall */
|
|
addr = 1;
|
|
|
|
case PTRACE_CONT: { /* restart after signal. */
|
|
if (!valid_signal(data)) {
|
|
pt_error_return(regs, EIO);
|
|
goto out_tsk;
|
|
}
|
|
|
|
if (request == PTRACE_SYSCALL) {
|
|
set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
|
|
} else {
|
|
clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
|
|
}
|
|
|
|
child->exit_code = data;
|
|
#ifdef DEBUG_PTRACE
|
|
printk("CONT: %s [%d]: set exit_code = %x %lx %lx\n", child->comm,
|
|
child->pid, child->exit_code,
|
|
child->thread_info->kregs->tpc,
|
|
child->thread_info->kregs->tnpc);
|
|
|
|
#endif
|
|
wake_up_process(child);
|
|
pt_succ_return(regs, 0);
|
|
goto out_tsk;
|
|
}
|
|
|
|
/*
|
|
* make the child exit. Best I can do is send it a sigkill.
|
|
* perhaps it should be put in the status that it wants to
|
|
* exit.
|
|
*/
|
|
case PTRACE_KILL: {
|
|
if (child->exit_state == EXIT_ZOMBIE) { /* already dead */
|
|
pt_succ_return(regs, 0);
|
|
goto out_tsk;
|
|
}
|
|
child->exit_code = SIGKILL;
|
|
wake_up_process(child);
|
|
pt_succ_return(regs, 0);
|
|
goto out_tsk;
|
|
}
|
|
|
|
case PTRACE_SUNDETACH: { /* detach a process that was attached. */
|
|
int error = ptrace_detach(child, data);
|
|
if (error) {
|
|
pt_error_return(regs, EIO);
|
|
goto out_tsk;
|
|
}
|
|
pt_succ_return(regs, 0);
|
|
goto out_tsk;
|
|
}
|
|
|
|
/* PTRACE_DUMPCORE unsupported... */
|
|
|
|
default: {
|
|
int err = ptrace_request(child, request, addr, data);
|
|
if (err)
|
|
pt_error_return(regs, -err);
|
|
else
|
|
pt_succ_return(regs, 0);
|
|
goto out_tsk;
|
|
}
|
|
}
|
|
out_tsk:
|
|
if (child)
|
|
put_task_struct(child);
|
|
out:
|
|
unlock_kernel();
|
|
}
|
|
|
|
asmlinkage void syscall_trace(struct pt_regs *regs, int syscall_exit_p)
|
|
{
|
|
/* do the secure computing check first */
|
|
secure_computing(regs->u_regs[UREG_G1]);
|
|
|
|
if (unlikely(current->audit_context) && syscall_exit_p) {
|
|
unsigned long tstate = regs->tstate;
|
|
int result = AUDITSC_SUCCESS;
|
|
|
|
if (unlikely(tstate & (TSTATE_XCARRY | TSTATE_ICARRY)))
|
|
result = AUDITSC_FAILURE;
|
|
|
|
audit_syscall_exit(current, result, regs->u_regs[UREG_I0]);
|
|
}
|
|
|
|
if (!(current->ptrace & PT_PTRACED))
|
|
goto out;
|
|
|
|
if (!test_thread_flag(TIF_SYSCALL_TRACE))
|
|
goto out;
|
|
|
|
ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
|
|
? 0x80 : 0));
|
|
|
|
/*
|
|
* 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
|
|
*/
|
|
if (current->exit_code) {
|
|
send_sig(current->exit_code, current, 1);
|
|
current->exit_code = 0;
|
|
}
|
|
|
|
out:
|
|
if (unlikely(current->audit_context) && !syscall_exit_p)
|
|
audit_syscall_entry(current,
|
|
(test_thread_flag(TIF_32BIT) ?
|
|
AUDIT_ARCH_SPARC :
|
|
AUDIT_ARCH_SPARC64),
|
|
regs->u_regs[UREG_G1],
|
|
regs->u_regs[UREG_I0],
|
|
regs->u_regs[UREG_I1],
|
|
regs->u_regs[UREG_I2],
|
|
regs->u_regs[UREG_I3]);
|
|
}
|