4.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Dave Martin <Dave.Martin@xxxxxxx>
commit 9a17b876b573441bfb3387ad55d98bf7184daf9d upstream.
Ensure that if userspace supplies insufficient data to
PTRACE_SETREGSET to fill all the registers, the thread's old
registers are preserved.
Fixes: 478fcb2cdb23 ("arm64: Debugging support")
Signed-off-by: Dave Martin <Dave.Martin@xxxxxxx>
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 | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
--- a/arch/arm64/kernel/ptrace.c
+++ b/arch/arm64/kernel/ptrace.c
@@ -595,7 +595,7 @@ static int gpr_set(struct task_struct *t
const void *kbuf, const void __user *ubuf)
{
int ret;
- struct user_pt_regs newregs;
+ struct user_pt_regs newregs = task_pt_regs(target)->user_regs;
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &newregs, 0, -1);
if (ret)
@@ -625,7 +625,8 @@ static int fpr_set(struct task_struct *t
const void *kbuf, const void __user *ubuf)
{
int ret;
- struct user_fpsimd_state newstate;
+ struct user_fpsimd_state newstate =
+ target->thread.fpsimd_state.user_fpsimd;
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &newstate, 0, -1);
if (ret)
@@ -649,7 +650,7 @@ static int tls_set(struct task_struct *t
const void *kbuf, const void __user *ubuf)
{
int ret;
- unsigned long tls;
+ unsigned long tls = target->thread.tp_value;
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &tls, 0, -1);
if (ret)
--
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