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POFor arm Linux, could threads in user space access virtual address of Kernel space?
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11274030
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2012-06-30T12:20:05.933
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2
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2012-06-30T17:34:26.433
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Virtual memory is split two parts. In tradition, 0~3GB is for user space and 3GB~4GB for kernel space. My question: Could the thread in user space access memory of kernel space? For ARM datasheet, the access attribution is in the charge of domain access control register. But in kernel source code,the domain value in page table entry of user space virtual memory is same as kernel space's page table entry.
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<linux><linux-kernel><arm>
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For arm Linux, could threads in user space access virtual address of Kernel space?
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1. USHaifeng Li
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 POFor arm Linux, could threads in user space access virtual address of Kernel space?
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1. COI have got the **answer**.The access permission management is still rely on domain and AP field in Page table entry and Domain access control register. Before 2.6.38, the start-up code initialize the DOMAIN_USER by DOMAIN_MANAGER. But in early_trap_init, the system will modify DOMAIN_USER to DOMAIN_CLIENT. And when the domain attribute is DOMAIN_CLIENT, the AP field in Page table entry will be effective. Thanks the following answers.
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 POFor arm Linux, could threads in user space access virtual address of Kernel space?
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 USHaifeng Li

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