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arm64/ptrace: Preserve previous registers for short regset write

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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> # 3.7.x-
Fixes: 478fcb2cdb ("arm64: Debugging support")
Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Acked-by: Will Deacon <Will.Deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Dave Martin 2017-01-18 16:25:20 +00:00 committed by Catalin Marinas
parent 1c8a946bf3
commit 9a17b876b5
1 changed files with 4 additions and 3 deletions
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7
arch/arm64/kernel/ptrace.c
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@ -596,7 +596,7 @@ 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)
@ -626,7 +626,8 @@ 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)
@ -650,7 +651,7 @@ 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)