Commit 76e08d29 authored by Dave Martin's avatar Dave Martin Committed by Greg Kroah-Hartman

arm64/ptrace: Preserve previous registers for short regset write

commit 9a17b876 upstream.

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

Fixes: 478fcb2c ("arm64: Debugging support")
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>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 41a9abb0
...@@ -495,7 +495,7 @@ static int gpr_set(struct task_struct *target, const struct user_regset *regset, ...@@ -495,7 +495,7 @@ static int gpr_set(struct task_struct *target, const struct user_regset *regset,
const void *kbuf, const void __user *ubuf) const void *kbuf, const void __user *ubuf)
{ {
int ret; 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); ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &newregs, 0, -1);
if (ret) if (ret)
...@@ -525,7 +525,8 @@ static int fpr_set(struct task_struct *target, const struct user_regset *regset, ...@@ -525,7 +525,8 @@ static int fpr_set(struct task_struct *target, const struct user_regset *regset,
const void *kbuf, const void __user *ubuf) const void *kbuf, const void __user *ubuf)
{ {
int ret; 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); ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &newstate, 0, -1);
if (ret) if (ret)
...@@ -549,7 +550,7 @@ static int tls_set(struct task_struct *target, const struct user_regset *regset, ...@@ -549,7 +550,7 @@ static int tls_set(struct task_struct *target, const struct user_regset *regset,
const void *kbuf, const void __user *ubuf) const void *kbuf, const void __user *ubuf)
{ {
int ret; int ret;
unsigned long tls; unsigned long 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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