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arm64: Better native ptrace support for compat tasks
The compat ptrace interface allows access to the TLS register, hardware breakpoints and watchpoints, syscall number. However, a native task using the native ptrace interface to debug compat tasks (e.g. multi-arch gdb) only has access to the general and VFP register sets. The compat ptrace interface cannot be accessed from a native task. This patch adds a new user_aarch32_ptrace_view which contains the TLS, hardware breakpoint/watchpoint and syscall number regsets in addition to the existing GPR and VFP regsets. This view is backwards compatible with the previous kernels. Core dumping of 32-bit tasks and compat ptrace are not affected since the original user_aarch32_view is preserved. Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Reported-by: Yao Qi <yao.qi@arm.com> Cc: Will Deacon <will.deacon@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
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0723c05fb7
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1 changed files with 91 additions and 1 deletions
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@ -826,6 +826,30 @@ static int compat_vfp_set(struct task_struct *target,
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return ret;
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}
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static int compat_tls_get(struct task_struct *target,
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const struct user_regset *regset, unsigned int pos,
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unsigned int count, void *kbuf, void __user *ubuf)
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{
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compat_ulong_t tls = (compat_ulong_t)target->thread.tp_value;
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return user_regset_copyout(&pos, &count, &kbuf, &ubuf, &tls, 0, -1);
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}
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static int compat_tls_set(struct task_struct *target,
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const struct user_regset *regset, unsigned int pos,
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unsigned int count, const void *kbuf,
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const void __user *ubuf)
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{
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int ret;
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compat_ulong_t tls;
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ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &tls, 0, -1);
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if (ret)
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return ret;
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target->thread.tp_value = tls;
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return ret;
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}
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static const struct user_regset aarch32_regsets[] = {
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[REGSET_COMPAT_GPR] = {
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.core_note_type = NT_PRSTATUS,
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@ -850,6 +874,64 @@ static const struct user_regset_view user_aarch32_view = {
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.regsets = aarch32_regsets, .n = ARRAY_SIZE(aarch32_regsets)
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};
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static const struct user_regset aarch32_ptrace_regsets[] = {
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[REGSET_GPR] = {
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.core_note_type = NT_PRSTATUS,
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.n = COMPAT_ELF_NGREG,
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.size = sizeof(compat_elf_greg_t),
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.align = sizeof(compat_elf_greg_t),
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.get = compat_gpr_get,
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.set = compat_gpr_set
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},
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[REGSET_FPR] = {
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.core_note_type = NT_ARM_VFP,
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.n = VFP_STATE_SIZE / sizeof(compat_ulong_t),
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.size = sizeof(compat_ulong_t),
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.align = sizeof(compat_ulong_t),
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.get = compat_vfp_get,
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.set = compat_vfp_set
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},
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[REGSET_TLS] = {
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.core_note_type = NT_ARM_TLS,
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.n = 1,
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.size = sizeof(compat_ulong_t),
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.align = sizeof(compat_ulong_t),
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.get = compat_tls_get,
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.set = compat_tls_set,
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},
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#ifdef CONFIG_HAVE_HW_BREAKPOINT
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[REGSET_HW_BREAK] = {
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.core_note_type = NT_ARM_HW_BREAK,
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.n = sizeof(struct user_hwdebug_state) / sizeof(u32),
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.size = sizeof(u32),
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.align = sizeof(u32),
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.get = hw_break_get,
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.set = hw_break_set,
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},
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[REGSET_HW_WATCH] = {
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.core_note_type = NT_ARM_HW_WATCH,
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.n = sizeof(struct user_hwdebug_state) / sizeof(u32),
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.size = sizeof(u32),
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.align = sizeof(u32),
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.get = hw_break_get,
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.set = hw_break_set,
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},
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#endif
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[REGSET_SYSTEM_CALL] = {
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.core_note_type = NT_ARM_SYSTEM_CALL,
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.n = 1,
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.size = sizeof(int),
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.align = sizeof(int),
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.get = system_call_get,
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.set = system_call_set,
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},
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};
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static const struct user_regset_view user_aarch32_ptrace_view = {
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.name = "aarch32", .e_machine = EM_ARM,
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.regsets = aarch32_ptrace_regsets, .n = ARRAY_SIZE(aarch32_ptrace_regsets)
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};
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static int compat_ptrace_read_user(struct task_struct *tsk, compat_ulong_t off,
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compat_ulong_t __user *ret)
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{
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@ -1109,8 +1191,16 @@ long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
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const struct user_regset_view *task_user_regset_view(struct task_struct *task)
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{
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#ifdef CONFIG_COMPAT
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if (is_compat_thread(task_thread_info(task)))
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/*
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* Core dumping of 32-bit tasks or compat ptrace requests must use the
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* user_aarch32_view compatible with arm32. Native ptrace requests on
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* 32-bit children use an extended user_aarch32_ptrace_view to allow
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* access to the TLS register.
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*/
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if (is_compat_task())
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return &user_aarch32_view;
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else if (is_compat_thread(task_thread_info(task)))
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return &user_aarch32_ptrace_view;
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#endif
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return &user_aarch64_view;
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}
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