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metag/ptrace: Reject partial NT_METAG_RPIPE writes

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It's not clear what behaviour is sensible when doing partial write of
NT_METAG_RPIPE, so just don't bother.

This patch assumes that userspace will never rely on a partial SETREGSET
in this case, since it's not clear what should happen anyway.

Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Acked-by: James Hogan <james.hogan@imgtec.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Dave Martin 2017-03-27 15:10:57 +01:00 committed by Linus Torvalds
parent 5fe81fe981
commit 7195ee3120
1 changed files with 2 additions and 0 deletions
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arch/metag/kernel/ptrace.c
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@ -253,6 +253,8 @@ int metag_rp_state_copyin(struct pt_regs *regs,
unsigned long long *ptr; unsigned long long *ptr;
int ret, i; int ret, i;
if (count < 4*13)
return -EINVAL;
/* Read the entire pipeline before making any changes */ /* Read the entire pipeline before making any changes */
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
&rp, 0, 4*13); &rp, 0, 4*13);