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MIPS: Disallow outsized PTRACE_SETREGSET NT_PRFPREG regset accesses

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Complement commit c23b3d1a53 ("MIPS: ptrace: Change GP regset to use
correct core dump register layout") and also reject outsized
PTRACE_SETREGSET requests to the NT_PRFPREG regset, like with the
NT_PRSTATUS regset.

Signed-off-by: Maciej W. Rozycki <macro@mips.com>
Fixes: c23b3d1a53 ("MIPS: ptrace: Change GP regset to use correct core dump register layout")
Cc: James Hogan <james.hogan@mips.com>
Cc: Paul Burton <Paul.Burton@mips.com>
Cc: Alex Smith <alex@alex-smith.me.uk>
Cc: Dave Martin <Dave.Martin@arm.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Cc: stable@vger.kernel.org # v3.17+
Patchwork: https://patchwork.linux-mips.org/patch/17930/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Maciej W. Rozycki 2017-12-11 22:56:54 +00:00 committed by Ralf Baechle
parent 006501e039
commit c8c5a3a24d
1 changed files with 3 additions and 0 deletions
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3
arch/mips/kernel/ptrace.c
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@ -550,6 +550,9 @@ static int fpr_set(struct task_struct *target,
BUG_ON(count % sizeof(elf_fpreg_t));
if (pos + count > sizeof(elf_fpregset_t))
return -EIO;
init_fp_ctx(target);
if (sizeof(target->thread.fpu.fpr[0]) == sizeof(elf_fpreg_t))