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arm64: ptrace: Flush FPSIMD regs back to thread_struct before reading 

When reading the FPSIMD state of current (which occurs when dumping
core), it is possible that userspace has modified the FPSIMD
registers since the time the task was last scheduled out.  Such
changes are not guaranteed to be reflected immedately in
thread_struct.

As a result, a coredump can contain stale values for these
registers.  Reading the registers of a stopped task via ptrace is
unaffected.

This patch explicitly flushes the CPU state back to thread_struct
before dumping when operating on current, thus ensuring that
coredump contents are up to date.

Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Dave Martin 2017-06-21 16:00:43 +01:00 committed by Will Deacon
parent af66b2d88a
commit e1d5a8fb73
1 changed files with 7 additions and 0 deletions
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7
arch/arm64/kernel/ptrace.c
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@ -623,6 +623,10 @@ static int fpr_get(struct task_struct *target, const struct user_regset *regset,
{
struct user_fpsimd_state *uregs;
uregs = &target->thread.fpsimd_state.user_fpsimd;
if (target == current)
fpsimd_preserve_current_state();
return user_regset_copyout(&pos, &count, &kbuf, &ubuf, uregs, 0, -1);
}
@ -898,6 +902,9 @@ static int compat_vfp_get(struct task_struct *target,
uregs = &target->thread.fpsimd_state.user_fpsimd;
if (target == current)
fpsimd_preserve_current_state();
/*
* The VFP registers are packed into the fpsimd_state, so they all sit
* nicely together for us. We just need to create the fpscr separately.