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Message-ID: <5e9821061002040009t27fc5a81m5075508f3a6634a6@mail.gmail.com> Date: Thu, 4 Feb 2010 10:09:57 +0200 From: Oleg Kutkov <elenbert@...il.com> To: linux-kernel@...r.kernel.org Subject: Fwd: Problem with set_memory_rw set_memory_rw()'s 1st argument requires virtual address. So, you need virtual address of the page you want. - phys_to_virt() ... convert physical address to virtual address. - virt_to_phys() ... convert virtual address to physical. Anyway, RW is vitual address mapping's attribute and not for physical. Thanks, -Kame Thank for answer! But this is a very strange, because 0x0509940 - it a virtual memory address (i got it from System.map, this is a system call table, on my machine). set_memory_rw return zero, anyway. Maybe, system call table is much write protected, so i can't change attribute of memory page? One more interesting thing: struct page *pg; pg = virt_to_page(addr); unsigned long page_addr; page_addr = (unsigned long) page_address(pg); addr - this is my virtual address (provided by System.map) But page_addr got another value! What wrong? Sorry, if my questions is to stupid. P.S. I know, that overwriting system call table is very bad, i just experimenting with my own network drivers and i need to replace some network system calls.. Best regard, Oleg. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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