linux-kernel - OOPS: how to hook system_call_table in redhat es5.1 on x86

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Message-ID: <4306ae870803011740k39d0769cy7fd6413b10146f74@mail.gmail.com>
Date:	Sun, 2 Mar 2008 09:40:14 +0800
From:	"Gang He" <hegang.linux@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: OOPS: how to hook system_call_table in redhat es5.1 on x86_64 platform

Hi,

as you know, Linux kernel (>2.6.18) set some pages read-only, we can
not hook system_call_table directly like before, the new source code
on i386 is

#ifdef CONFIG_DEBUG_RODATA
     // fix kernel perms
    change_page_attr(virt_to_page(syscall_table), 1, PAGE_KERNEL);
    global_flush_tlb();
#endif

    // hook syscall_table, change some system call to your function
   syscall_table[__NR_open] = my_sys_open;

#ifdef CONFIG_DEBUG_RODATA
     // fix kernel perms
    change_page_attr(virt_to_page(syscall_table), 1, PAGE_KERNEL_RO);
    global_flush_tlb();
#endif

but I use the source code above to redhat es5.1 on x86_64, this will
bring Linux crash, who can help me  to hook system_call_table in
redhat es5.1 on x86_64 platform.

Thanks
Gang
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