Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/cmarinas/linux-aarch64

Pull arm64 fixes from Catalin Marinas:
 "Main changes:
   - AArch64 Linux compilation fixes following 3.7-rc1 changes
     (MODULES_USE_ELF_RELA, update_vsyscall() prototype)
   - Unnecessary register setting in start_thread() (thanks to Al Viro)
   - ptrace fixes"

* tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/cmarinas/linux-aarch64:
  arm64: fix alignment padding in assembly code
  arm64: ptrace: use HW_BREAKPOINT_EMPTY type for disabled breakpoints
  arm64: ptrace: make structure padding explicit for debug registers
  arm64: No need to set the x0-x2 registers in start_thread()
  arm64: Ignore memory blocks below PHYS_OFFSET
  arm64: Fix the update_vsyscall() prototype
  arm64: Select MODULES_USE_ELF_RELA
  arm64: Remove duplicate inclusion of mmu_context.h in smp.c

1 files changed, 51 insertions, 22 deletions

diff --git a/arch/arm64/kernel/ptrace.c b/arch/arm64/kernel/ptrace.c
index 2ea3968367c2..6e1e77f1831c 100644
--- a/arch/arm64/kernel/ptrace.c
+++ b/arch/arm64/kernel/ptrace.c
@@ -234,28 +234,33 @@ static int ptrace_hbp_fill_attr_ctrl(unsigned int note_type,
 				     struct arch_hw_breakpoint_ctrl ctrl,
 				     struct perf_event_attr *attr)
 {
-	int err, len, type;
+	int err, len, type, disabled = !ctrl.enabled;
 
-	err = arch_bp_generic_fields(ctrl, &len, &type);
-	if (err)
-		return err;
-
-	switch (note_type) {
-	case NT_ARM_HW_BREAK:
-		if ((type & HW_BREAKPOINT_X) != type)
-			return -EINVAL;
-		break;
-	case NT_ARM_HW_WATCH:
-		if ((type & HW_BREAKPOINT_RW) != type)
+	if (disabled) {
+		len = 0;
+		type = HW_BREAKPOINT_EMPTY;
+	} else {
+		err = arch_bp_generic_fields(ctrl, &len, &type);
+		if (err)
+			return err;
+
+		switch (note_type) {
+		case NT_ARM_HW_BREAK:
+			if ((type & HW_BREAKPOINT_X) != type)
+				return -EINVAL;
+			break;
+		case NT_ARM_HW_WATCH:
+			if ((type & HW_BREAKPOINT_RW) != type)
+				return -EINVAL;
+			break;
+		default:
 			return -EINVAL;
-		break;
-	default:
-		return -EINVAL;
+		}
 	}
 
 	attr->bp_len	= len;
 	attr->bp_type	= type;
-	attr->disabled	= !ctrl.enabled;
+	attr->disabled	= disabled;
 
 	return 0;
 }
@@ -372,7 +377,7 @@ static int ptrace_hbp_set_addr(unsigned int note_type,
 
 #define PTRACE_HBP_ADDR_SZ	sizeof(u64)
 #define PTRACE_HBP_CTRL_SZ	sizeof(u32)
-#define PTRACE_HBP_REG_OFF	sizeof(u32)
+#define PTRACE_HBP_PAD_SZ	sizeof(u32)
 
 static int hw_break_get(struct task_struct *target,
 			const struct user_regset *regset,
@@ -380,7 +385,7 @@ static int hw_break_get(struct task_struct *target,
 			void *kbuf, void __user *ubuf)
 {
 	unsigned int note_type = regset->core_note_type;
-	int ret, idx = 0, offset = PTRACE_HBP_REG_OFF, limit;
+	int ret, idx = 0, offset, limit;
 	u32 info, ctrl;
 	u64 addr;
 
@@ -389,11 +394,20 @@ static int hw_break_get(struct task_struct *target,
 	if (ret)
 		return ret;
 
-	ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, &info, 0, 4);
+	ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, &info, 0,
+				  sizeof(info));
+	if (ret)
+		return ret;
+
+	/* Pad */
+	offset = offsetof(struct user_hwdebug_state, pad);
+	ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf, offset,
+				       offset + PTRACE_HBP_PAD_SZ);
 	if (ret)
 		return ret;
 
 	/* (address, ctrl) registers */
+	offset = offsetof(struct user_hwdebug_state, dbg_regs);
 	limit = regset->n * regset->size;
 	while (count && offset < limit) {
 		ret = ptrace_hbp_get_addr(note_type, target, idx, &addr);
@@ -413,6 +427,13 @@ static int hw_break_get(struct task_struct *target,
 		if (ret)
 			return ret;
 		offset += PTRACE_HBP_CTRL_SZ;
+
+		ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
+					       offset,
+					       offset + PTRACE_HBP_PAD_SZ);
+		if (ret)
+			return ret;
+		offset += PTRACE_HBP_PAD_SZ;
 		idx++;
 	}
 
@@ -425,12 +446,13 @@ static int hw_break_set(struct task_struct *target,
 			const void *kbuf, const void __user *ubuf)
 {
 	unsigned int note_type = regset->core_note_type;
-	int ret, idx = 0, offset = PTRACE_HBP_REG_OFF, limit;
+	int ret, idx = 0, offset, limit;
 	u32 ctrl;
 	u64 addr;
 
-	/* Resource info */
-	ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, 0, 4);
+	/* Resource info and pad */
+	offset = offsetof(struct user_hwdebug_state, dbg_regs);
+	ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, 0, offset);
 	if (ret)
 		return ret;
 
@@ -454,6 +476,13 @@ static int hw_break_set(struct task_struct *target,
 		if (ret)
 			return ret;
 		offset += PTRACE_HBP_CTRL_SZ;
+
+		ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
+						offset,
+						offset + PTRACE_HBP_PAD_SZ);
+		if (ret)
+			return ret;
+		offset += PTRACE_HBP_PAD_SZ;
 		idx++;
 	}