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SubjectRe: [RFC c/r 4/4] c/r: prctl: Extend PR_SET_MM to set up more mm_struct entries
>> +
>> + case PR_SET_MM_AUXV:
>> + if (arg4 > sizeof(mm->saved_auxv))
>> + goto out;
>> + up_read(&mm->mmap_sem);
>> +
>> + error = -EFAULT;
>> + if (!copy_from_user(mm->saved_auxv, (const void __user *)addr, arg4))
>> + error = 0;
>> +
>> + return error;
>
> Is the mmap_sem released here because of the copy_from_user()? Is it
> still safe to write to saved_auxv?

Sure. It's unsafe.



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