| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.9 054/130] powerpc/ptrace: Preserve previous fprs/vsrs on short regset write | Date | Tue, 24 Jan 2017 08:54:54 +0100 |
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4.9-stable review patch. If anyone has any objections, please let me know.
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From: Dave Martin <Dave.Martin@arm.com>
commit 99dfe80a2a246c600440a815741fd2e74a8b4977 upstream.
Ensure that if userspace supplies insufficient data to PTRACE_SETREGSET to fill all the registers, the thread's old registers are preserved.
Fixes: c6e6771b87d4 ("powerpc: Introduce VSX thread_struct and CONFIG_VSX") Signed-off-by: Dave Martin <Dave.Martin@arm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- arch/powerpc/kernel/ptrace.c | 7 +++++++ 1 file changed, 7 insertions(+)
--- a/arch/powerpc/kernel/ptrace.c +++ b/arch/powerpc/kernel/ptrace.c @@ -463,6 +463,10 @@ static int fpr_set(struct task_struct *t flush_fp_to_thread(target); + for (i = 0; i < 32 ; i++) + buf[i] = target->thread.TS_FPR(i); + buf[32] = target->thread.fp_state.fpscr; + /* copy to local buffer then write that out */ i = user_regset_copyin(&pos, &count, &kbuf, &ubuf, buf, 0, -1); if (i) @@ -672,6 +676,9 @@ static int vsr_set(struct task_struct *t flush_altivec_to_thread(target); flush_vsx_to_thread(target); + for (i = 0; i < 32 ; i++) + buf[i] = target->thread.fp_state.fpr[i][TS_VSRLOWOFFSET]; + ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, buf, 0, 32 * sizeof(double)); if (!ret)
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