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Diffstat (limited to 'arch/x86/kernel/ptrace.c')
-rw-r--r--arch/x86/kernel/ptrace.c204
1 files changed, 117 insertions, 87 deletions
diff --git a/arch/x86/kernel/ptrace.c b/arch/x86/kernel/ptrace.c
index 702c33efea8..eb92ccbb350 100644
--- a/arch/x86/kernel/ptrace.c
+++ b/arch/x86/kernel/ptrace.c
@@ -323,6 +323,16 @@ static int putreg(struct task_struct *child,
return set_flags(child, value);
#ifdef CONFIG_X86_64
+ /*
+ * Orig_ax is really just a flag with small positive and
+ * negative values, so make sure to always sign-extend it
+ * from 32 bits so that it works correctly regardless of
+ * whether we come from a 32-bit environment or not.
+ */
+ case offsetof(struct user_regs_struct, orig_ax):
+ value = (long) (s32) value;
+ break;
+
case offsetof(struct user_regs_struct,fs_base):
if (value >= TASK_SIZE_OF(child))
return -EIO;
@@ -544,6 +554,8 @@ static int ptrace_set_debugreg(struct task_struct *child,
return 0;
}
+#ifdef X86_BTS
+
static int ptrace_bts_get_size(struct task_struct *child)
{
if (!child->thread.ds_area_msr)
@@ -588,21 +600,6 @@ static int ptrace_bts_read_record(struct task_struct *child,
return sizeof(ret);
}
-static int ptrace_bts_write_record(struct task_struct *child,
- const struct bts_struct *in)
-{
- int retval;
-
- if (!child->thread.ds_area_msr)
- return -ENXIO;
-
- retval = ds_write_bts((void *)child->thread.ds_area_msr, in);
- if (retval)
- return retval;
-
- return sizeof(*in);
-}
-
static int ptrace_bts_clear(struct task_struct *child)
{
if (!child->thread.ds_area_msr)
@@ -645,75 +642,6 @@ static int ptrace_bts_drain(struct task_struct *child,
return end;
}
-static int ptrace_bts_realloc(struct task_struct *child,
- int size, int reduce_size)
-{
- unsigned long rlim, vm;
- int ret, old_size;
-
- if (size < 0)
- return -EINVAL;
-
- old_size = ds_get_bts_size((void *)child->thread.ds_area_msr);
- if (old_size < 0)
- return old_size;
-
- ret = ds_free((void **)&child->thread.ds_area_msr);
- if (ret < 0)
- goto out;
-
- size >>= PAGE_SHIFT;
- old_size >>= PAGE_SHIFT;
-
- current->mm->total_vm -= old_size;
- current->mm->locked_vm -= old_size;
-
- if (size == 0)
- goto out;
-
- rlim = current->signal->rlim[RLIMIT_AS].rlim_cur >> PAGE_SHIFT;
- vm = current->mm->total_vm + size;
- if (rlim < vm) {
- ret = -ENOMEM;
-
- if (!reduce_size)
- goto out;
-
- size = rlim - current->mm->total_vm;
- if (size <= 0)
- goto out;
- }
-
- rlim = current->signal->rlim[RLIMIT_MEMLOCK].rlim_cur >> PAGE_SHIFT;
- vm = current->mm->locked_vm + size;
- if (rlim < vm) {
- ret = -ENOMEM;
-
- if (!reduce_size)
- goto out;
-
- size = rlim - current->mm->locked_vm;
- if (size <= 0)
- goto out;
- }
-
- ret = ds_allocate((void **)&child->thread.ds_area_msr,
- size << PAGE_SHIFT);
- if (ret < 0)
- goto out;
-
- current->mm->total_vm += size;
- current->mm->locked_vm += size;
-
-out:
- if (child->thread.ds_area_msr)
- set_tsk_thread_flag(child, TIF_DS_AREA_MSR);
- else
- clear_tsk_thread_flag(child, TIF_DS_AREA_MSR);
-
- return ret;
-}
-
static int ptrace_bts_config(struct task_struct *child,
long cfg_size,
const struct ptrace_bts_config __user *ucfg)
@@ -816,6 +744,91 @@ static int ptrace_bts_status(struct task_struct *child,
return sizeof(cfg);
}
+
+static int ptrace_bts_write_record(struct task_struct *child,
+ const struct bts_struct *in)
+{
+ int retval;
+
+ if (!child->thread.ds_area_msr)
+ return -ENXIO;
+
+ retval = ds_write_bts((void *)child->thread.ds_area_msr, in);
+ if (retval)
+ return retval;
+
+ return sizeof(*in);
+}
+
+static int ptrace_bts_realloc(struct task_struct *child,
+ int size, int reduce_size)
+{
+ unsigned long rlim, vm;
+ int ret, old_size;
+
+ if (size < 0)
+ return -EINVAL;
+
+ old_size = ds_get_bts_size((void *)child->thread.ds_area_msr);
+ if (old_size < 0)
+ return old_size;
+
+ ret = ds_free((void **)&child->thread.ds_area_msr);
+ if (ret < 0)
+ goto out;
+
+ size >>= PAGE_SHIFT;
+ old_size >>= PAGE_SHIFT;
+
+ current->mm->total_vm -= old_size;
+ current->mm->locked_vm -= old_size;
+
+ if (size == 0)
+ goto out;
+
+ rlim = current->signal->rlim[RLIMIT_AS].rlim_cur >> PAGE_SHIFT;
+ vm = current->mm->total_vm + size;
+ if (rlim < vm) {
+ ret = -ENOMEM;
+
+ if (!reduce_size)
+ goto out;
+
+ size = rlim - current->mm->total_vm;
+ if (size <= 0)
+ goto out;
+ }
+
+ rlim = current->signal->rlim[RLIMIT_MEMLOCK].rlim_cur >> PAGE_SHIFT;
+ vm = current->mm->locked_vm + size;
+ if (rlim < vm) {
+ ret = -ENOMEM;
+
+ if (!reduce_size)
+ goto out;
+
+ size = rlim - current->mm->locked_vm;
+ if (size <= 0)
+ goto out;
+ }
+
+ ret = ds_allocate((void **)&child->thread.ds_area_msr,
+ size << PAGE_SHIFT);
+ if (ret < 0)
+ goto out;
+
+ current->mm->total_vm += size;
+ current->mm->locked_vm += size;
+
+out:
+ if (child->thread.ds_area_msr)
+ set_tsk_thread_flag(child, TIF_DS_AREA_MSR);
+ else
+ clear_tsk_thread_flag(child, TIF_DS_AREA_MSR);
+
+ return ret;
+}
+
void ptrace_bts_take_timestamp(struct task_struct *tsk,
enum bts_qualifier qualifier)
{
@@ -826,6 +839,7 @@ void ptrace_bts_take_timestamp(struct task_struct *tsk,
ptrace_bts_write_record(tsk, &rec);
}
+#endif /* X86_BTS */
/*
* Called by kernel/ptrace.c when detaching..
@@ -839,7 +853,9 @@ void ptrace_disable(struct task_struct *child)
clear_tsk_thread_flag(child, TIF_SYSCALL_EMU);
#endif
if (child->thread.ds_area_msr) {
+#ifdef X86_BTS
ptrace_bts_realloc(child, 0, 0);
+#endif
child->thread.debugctlmsr &= ~ds_debugctl_mask();
if (!child->thread.debugctlmsr)
clear_tsk_thread_flag(child, TIF_DEBUGCTLMSR);
@@ -961,6 +977,10 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
break;
#endif
+ /*
+ * These bits need more cooking - not enabled yet:
+ */
+#ifdef X86_BTS
case PTRACE_BTS_CONFIG:
ret = ptrace_bts_config
(child, data, (struct ptrace_bts_config __user *)addr);
@@ -988,6 +1008,7 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
ret = ptrace_bts_drain
(child, data, (struct bts_struct __user *) addr);
break;
+#endif
default:
ret = ptrace_request(child, request, addr, data);
@@ -1035,10 +1056,17 @@ static int putreg32(struct task_struct *child, unsigned regno, u32 value)
R32(esi, si);
R32(ebp, bp);
R32(eax, ax);
- R32(orig_eax, orig_ax);
R32(eip, ip);
R32(esp, sp);
+ case offsetof(struct user32, regs.orig_eax):
+ /*
+ * Sign-extend the value so that orig_eax = -1
+ * causes (long)orig_ax < 0 tests to fire correctly.
+ */
+ regs->orig_ax = (long) (s32) value;
+ break;
+
case offsetof(struct user32, regs.eflags):
return set_flags(child, value);
@@ -1160,7 +1188,7 @@ static int genregs32_set(struct task_struct *target,
if (kbuf) {
const compat_ulong_t *k = kbuf;
while (count > 0 && !ret) {
- ret = putreg(target, pos, *k++);
+ ret = putreg32(target, pos, *k++);
count -= sizeof(*k);
pos += sizeof(*k);
}
@@ -1171,7 +1199,7 @@ static int genregs32_set(struct task_struct *target,
ret = __get_user(word, u++);
if (ret)
break;
- ret = putreg(target, pos, word);
+ ret = putreg32(target, pos, word);
count -= sizeof(*u);
pos += sizeof(*u);
}
@@ -1226,12 +1254,14 @@ asmlinkage long sys32_ptrace(long request, u32 pid, u32 addr, u32 data)
case PTRACE_SETOPTIONS:
case PTRACE_SET_THREAD_AREA:
case PTRACE_GET_THREAD_AREA:
+#ifdef X86_BTS
case PTRACE_BTS_CONFIG:
case PTRACE_BTS_STATUS:
case PTRACE_BTS_SIZE:
case PTRACE_BTS_GET:
case PTRACE_BTS_CLEAR:
case PTRACE_BTS_DRAIN:
+#endif
return sys_ptrace(request, pid, addr, data);
default:
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-03-27 12:53:12 +0000