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sparc/ptrace: Preserve previous registers for short regset write 

Ensure that if userspace supplies insufficient data to PTRACE_SETREGSET
to fill all the registers, the thread's old registers are preserved.

Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Dave Martin 2017-03-27 15:10:59 +01:00 committed by Linus Torvalds
parent d614fd58a2
commit d3805c546b
1 changed files with 1 additions and 1 deletions
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2
arch/sparc/kernel/ptrace_64.c
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@ -350,7 +350,7 @@ static int genregs64_set(struct task_struct *target,
} }
if (!ret) { if (!ret) {
unsigned long y; unsigned long y = regs->y;
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
&y, &y,