| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.4 32/42] arm64/ptrace: Preserve previous registers for short regset write - 3 | Date | Tue, 24 Jan 2017 08:55:42 +0100 |
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4.4-stable review patch. If anyone has any objections, please let me know.
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From: Dave Martin <Dave.Martin@arm.com>
commit a672401c00f82e4e19704aff361d9bad18003714 upstream.
Ensure that if userspace supplies insufficient data to PTRACE_SETREGSET to fill all the registers, the thread's old registers are preserved.
Fixes: 5d220ff9420f ("arm64: Better native ptrace support for compat tasks") 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> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- arch/arm64/kernel/ptrace.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/arm64/kernel/ptrace.c +++ b/arch/arm64/kernel/ptrace.c @@ -849,7 +849,7 @@ static int compat_tls_set(struct task_st const void __user *ubuf) { 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); if (ret)
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