Commit a672401c authored by Dave Martin's avatar Dave Martin Committed by Catalin Marinas

arm64/ptrace: Preserve previous registers for short regset write

Ensure that if userspace supplies insufficient data to
PTRACE_SETREGSET to fill all the registers, the thread's old
registers are preserved.

Cc: <stable@vger.kernel.org> # 4.3.x-
Fixes: 5d220ff9 ("arm64: Better native ptrace support for compat tasks")
Signed-off-by: default avatarDave Martin <Dave.Martin@arm.com>
Acked-by: default avatarWill Deacon <Will.Deacon@arm.com>
Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
parent 9dd73f72
...@@ -950,7 +950,7 @@ static int compat_tls_set(struct task_struct *target, ...@@ -950,7 +950,7 @@ static int compat_tls_set(struct task_struct *target,
const void __user *ubuf) const void __user *ubuf)
{ {
int ret; int ret;
compat_ulong_t tls; compat_ulong_t tls = target->thread.tp_value;
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &tls, 0, -1); ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &tls, 0, -1);
if (ret) if (ret)
......
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