Patch "arm64: ptrace: fix empty registers set in prstatus of aarch32 process core" has been added to the 3.14-stable tree

[<gregkh@xxxxxxxxxxxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    arm64: ptrace: fix empty registers set in prstatus of aarch32 process core

to the 3.14-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     arm64-ptrace-fix-empty-registers-set-in-prstatus-of-aarch32-process-core.patch
and it can be found in the queue-3.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From 2227901a0230d8fde81ba9c602d649839390f56b Mon Sep 17 00:00:00 2001
From: Victor Kamensky <victor.kamensky@xxxxxxxxxx>
Date: Tue, 3 Jun 2014 19:21:30 +0100
Subject: arm64: ptrace: fix empty registers set in prstatus of aarch32 process core

From: Victor Kamensky <victor.kamensky@xxxxxxxxxx>

commit 2227901a0230d8fde81ba9c602d649839390f56b upstream.

Currently core file of aarch32 process prstatus note has empty
registers set. As result aarch32 core files create by V8 kernel are
not very useful.

It happens because compat_gpr_get and compat_gpr_set functions can
copy registers values to/from either kbuf or ubuf. ELF core file
collection function fill_thread_core_info calls compat_gpr_get
with kbuf set and ubuf set to 0. But current compat_gpr_get and
compat_gpr_set function handle copy to/from only ubuf case.

Fix is to handle kbuf and ubuf as two separate cases in similar
way as other functions like user_regset_copyout, user_regset_copyin do.

Signed-off-by: Victor Kamensky <victor.kamensky@xxxxxxxxxx>
Acked-by: Will Deacon <will.deacon@xxxxxxx>
Signed-off-by: Catalin Marinas <catalin.marinas@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 arch/arm64/kernel/ptrace.c |   26 ++++++++++++++++++--------
 1 file changed, 18 insertions(+), 8 deletions(-)

--- a/arch/arm64/kernel/ptrace.c
+++ b/arch/arm64/kernel/ptrace.c
@@ -650,11 +650,16 @@ static int compat_gpr_get(struct task_st
 			reg = task_pt_regs(target)->regs[idx];
 		}
 
-		ret = copy_to_user(ubuf, &reg, sizeof(reg));
-		if (ret)
-			break;
+		if (kbuf) {
+			memcpy(kbuf, &reg, sizeof(reg));
+			kbuf += sizeof(reg);
+		} else {
+			ret = copy_to_user(ubuf, &reg, sizeof(reg));
+			if (ret)
+				break;
 
-		ubuf += sizeof(reg);
+			ubuf += sizeof(reg);
+		}
 	}
 
 	return ret;
@@ -684,11 +689,16 @@ static int compat_gpr_set(struct task_st
 		unsigned int idx = start + i;
 		compat_ulong_t reg;
 
-		ret = copy_from_user(&reg, ubuf, sizeof(reg));
-		if (ret)
-			return ret;
+		if (kbuf) {
+			memcpy(&reg, kbuf, sizeof(reg));
+			kbuf += sizeof(reg);
+		} else {
+			ret = copy_from_user(&reg, ubuf, sizeof(reg));
+			if (ret)
+				return ret;
 
-		ubuf += sizeof(reg);
+			ubuf += sizeof(reg);
+		}
 
 		switch (idx) {
 		case 15:


Patches currently in stable-queue which might be from victor.kamensky@xxxxxxxxxx are

queue-3.14/arm64-ptrace-fix-empty-registers-set-in-prstatus-of-aarch32-process-core.patch
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