| From | Jiri Slaby <> | Subject | [PATCH 3.12 040/113] ARM: 8643/3: arm/ptrace: Preserve previous registers for short regset write | Date | Mon, 6 Mar 2017 10:11:04 +0100 |
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From: Dave Martin <Dave.Martin@arm.com>
3.12-stable review patch. If anyone has any objections, please let me know.
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commit 228dbbfb5d77f8e047b2a1d78da14b7158433027 upstream.
Ensure that if userspace supplies insufficient data to PTRACE_SETREGSET to fill all the registers, the thread's old registers are preserved.
Fixes: 5be6f62b0059 ("ARM: 6883/1: ptrace: Migrate to regsets framework") Signed-off-by: Dave Martin <Dave.Martin@arm.com> Acked-by: Russell King <rmk+kernel@armlinux.org.uk> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Signed-off-by: Jiri Slaby <jslaby@suse.cz> --- arch/arm/kernel/ptrace.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/arm/kernel/ptrace.c b/arch/arm/kernel/ptrace.c index ec33df500f86..93e6b7ea81b9 100644 --- a/arch/arm/kernel/ptrace.c +++ b/arch/arm/kernel/ptrace.c @@ -600,7 +600,7 @@ static int gpr_set(struct task_struct *target, const void *kbuf, const void __user *ubuf) { int ret; - struct pt_regs newregs; + struct pt_regs newregs = *task_pt_regs(target); ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &newregs, -- 2.12.0
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