From: Dave Martin Date: Thu, 29 Jun 2017 14:25:48 +0000 (+0100) Subject: arm64: ptrace: Remove redundant overrun check from compat_vfp_set() X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=16d38acb12d065ebe3494e4e31e8b4438f3214da;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git arm64: ptrace: Remove redundant overrun check from compat_vfp_set() compat_vfp_set() checks for userspace trying to write an excessive amount of data to the regset. However this check is conspicuous for its absence from every other _set() in the arm64 ptrace implementation. In fact, the core ptrace_regset() already clamps userspace's iov_len to the regset size before the individual regset .{get,set}() methods get called. This patch removes the redundant check. Signed-off-by: Dave Martin Signed-off-by: Will Deacon --- diff --git a/arch/arm64/kernel/ptrace.c b/arch/arm64/kernel/ptrace.c index 4c068dcf1977..949ab6bdfbad 100644 --- a/arch/arm64/kernel/ptrace.c +++ b/arch/arm64/kernel/ptrace.c @@ -937,9 +937,6 @@ static int compat_vfp_set(struct task_struct *target, compat_ulong_t fpscr; int ret; - if (pos + count > VFP_STATE_SIZE) - return -EIO; - uregs = &target->thread.fpsimd_state.user_fpsimd; ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, uregs, 0,