diff options
Diffstat (limited to 'arch/sparc64')
| -rw-r--r-- | arch/sparc64/kernel/ptrace.c | 148 |
1 files changed, 97 insertions, 51 deletions
diff --git a/arch/sparc64/kernel/ptrace.c b/arch/sparc64/kernel/ptrace.c index 7963595c77cc..e9fc0aa2da38 100644 --- a/arch/sparc64/kernel/ptrace.c +++ b/arch/sparc64/kernel/ptrace.c @@ -114,6 +114,85 @@ void flush_ptrace_access(struct vm_area_struct *vma, struct page *page, preempt_enable(); } +static int get_from_target(struct task_struct *target, unsigned long uaddr, + void *kbuf, int len) +{ + if (target == current) { + if (copy_from_user(kbuf, (void __user *) uaddr, len)) + return -EFAULT; + } else { + int len2 = access_process_vm(target, uaddr, kbuf, len, 0); + if (len2 != len) + return -EFAULT; + } + return 0; +} + +static int set_to_target(struct task_struct *target, unsigned long uaddr, + void *kbuf, int len) +{ + if (target == current) { + if (copy_to_user((void __user *) uaddr, kbuf, len)) + return -EFAULT; + } else { + int len2 = access_process_vm(target, uaddr, kbuf, len, 1); + if (len2 != len) + return -EFAULT; + } + return 0; +} + +static int regwindow64_get(struct task_struct *target, + const struct pt_regs *regs, + struct reg_window *wbuf) +{ + unsigned long rw_addr = regs->u_regs[UREG_I6]; + + if (test_tsk_thread_flag(current, TIF_32BIT)) { + struct reg_window32 win32; + int i; + + if (get_from_target(target, rw_addr, &win32, sizeof(win32))) + return -EFAULT; + for (i = 0; i < 8; i++) + wbuf->locals[i] = win32.locals[i]; + for (i = 0; i < 8; i++) + wbuf->ins[i] = win32.ins[i]; + } else { + rw_addr += STACK_BIAS; + if (get_from_target(target, rw_addr, wbuf, sizeof(*wbuf))) + return -EFAULT; + } + + return 0; +} + +static int regwindow64_set(struct task_struct *target, + const struct pt_regs *regs, + struct reg_window *wbuf) +{ + unsigned long rw_addr = regs->u_regs[UREG_I6]; + + if (test_tsk_thread_flag(current, TIF_32BIT)) { + struct reg_window32 win32; + int i; + + for (i = 0; i < 8; i++) + win32.locals[i] = wbuf->locals[i]; + for (i = 0; i < 8; i++) + win32.ins[i] = wbuf->ins[i]; + + if (set_to_target(target, rw_addr, &win32, sizeof(win32))) + return -EFAULT; + } else { + rw_addr += STACK_BIAS; + if (set_to_target(target, rw_addr, wbuf, sizeof(*wbuf))) + return -EFAULT; + } + + return 0; +} + enum sparc_regset { REGSET_GENERAL, REGSET_FP, @@ -133,25 +212,13 @@ static int genregs64_get(struct task_struct *target, ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, regs->u_regs, 0, 16 * sizeof(u64)); - if (!ret) { - unsigned long __user *reg_window = (unsigned long __user *) - (regs->u_regs[UREG_I6] + STACK_BIAS); - unsigned long window[16]; - - if (target == current) { - if (copy_from_user(window, reg_window, sizeof(window))) - return -EFAULT; - } else { - if (access_process_vm(target, - (unsigned long) reg_window, - window, - sizeof(window), 0) != - sizeof(window)) - return -EFAULT; - } + if (!ret && count && pos < (32 * sizeof(u64))) { + struct reg_window window; + if (regwindow64_get(target, regs, &window)) + return -EFAULT; ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, - window, + &window, 16 * sizeof(u64), 32 * sizeof(u64)); } @@ -173,10 +240,11 @@ static int genregs64_get(struct task_struct *target, 36 * sizeof(u64)); } - if (!ret) + if (!ret) { ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf, 36 * sizeof(u64), -1); + } return ret; } @@ -194,42 +262,20 @@ static int genregs64_set(struct task_struct *target, ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, regs->u_regs, 0, 16 * sizeof(u64)); - if (!ret && count > 0) { - unsigned long __user *reg_window = (unsigned long __user *) - (regs->u_regs[UREG_I6] + STACK_BIAS); - unsigned long window[16]; + if (!ret && count && pos < (32 * sizeof(u64))) { + struct reg_window window; - if (target == current) { - if (copy_from_user(window, reg_window, sizeof(window))) - return -EFAULT; - } else { - if (access_process_vm(target, - (unsigned long) reg_window, - window, - sizeof(window), 0) != - sizeof(window)) - return -EFAULT; - } + if (regwindow64_get(target, regs, &window)) + return -EFAULT; ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, - window, + &window, 16 * sizeof(u64), 32 * sizeof(u64)); - if (!ret) { - if (target == current) { - if (copy_to_user(reg_window, window, - sizeof(window))) - return -EFAULT; - } else { - if (access_process_vm(target, - (unsigned long) - reg_window, - window, - sizeof(window), 1) != - sizeof(window)) - return -EFAULT; - } - } + + if (!ret && + regwindow64_set(target, regs, &window)) + return -EFAULT; } if (!ret && count > 0) { @@ -805,7 +851,7 @@ struct compat_fps { long compat_arch_ptrace(struct task_struct *child, compat_long_t request, compat_ulong_t caddr, compat_ulong_t cdata) { - const struct user_regset_view *view = task_user_regset_view(child); + const struct user_regset_view *view = task_user_regset_view(current); compat_ulong_t caddr2 = task_pt_regs(current)->u_regs[UREG_I4]; struct pt_regs32 __user *pregs; struct compat_fps __user *fps; @@ -913,7 +959,7 @@ struct fps { long arch_ptrace(struct task_struct *child, long request, long addr, long data) { - const struct user_regset_view *view = task_user_regset_view(child); + const struct user_regset_view *view = task_user_regset_view(current); unsigned long addr2 = task_pt_regs(current)->u_regs[UREG_I4]; struct pt_regs __user *pregs; struct fps __user *fps; |