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    Subject[PATCH] [2/11] Add a kernel_address() that works for data too
    Date

    Add a variant of kernel_text_address() that includes kernel data.

    Assumes kernel is _text ... _end - init section. True everywhere?

    Cc: linux-arch@vger.kernel.org
    Signed-off-by: Andi Kleen <ak@linux.intel.com>

    ---
    include/linux/kernel.h | 1 +
    kernel/extable.c | 18 ++++++++++++++++++
    2 files changed, 19 insertions(+)

    Index: linux-2.6.33-rc1-ak/include/linux/kernel.h
    ===================================================================
    --- linux-2.6.33-rc1-ak.orig/include/linux/kernel.h
    +++ linux-2.6.33-rc1-ak/include/linux/kernel.h
    @@ -205,6 +205,7 @@ extern unsigned long long memparse(const
    extern int core_kernel_text(unsigned long addr);
    extern int __kernel_text_address(unsigned long addr);
    extern int kernel_text_address(unsigned long addr);
    +extern int kernel_address(unsigned long addr);
    extern int func_ptr_is_kernel_text(void *ptr);

    struct pid;
    Index: linux-2.6.33-rc1-ak/kernel/extable.c
    ===================================================================
    --- linux-2.6.33-rc1-ak.orig/kernel/extable.c
    +++ linux-2.6.33-rc1-ak/kernel/extable.c
    @@ -72,6 +72,18 @@ int core_kernel_text(unsigned long addr)
    return 0;
    }

    +static int core_kernel_address(unsigned long addr)
    +{
    + if ((addr >= (unsigned long)_text &&
    + addr <= (unsigned long)_end)) {
    + if (addr >= (unsigned long)__init_begin &&
    + addr < (unsigned long)__init_end)
    + return system_state == SYSTEM_BOOTING;
    + return 1;
    + }
    + return 0;
    +}
    +
    int __kernel_text_address(unsigned long addr)
    {
    if (core_kernel_text(addr))
    @@ -98,6 +110,12 @@ int kernel_text_address(unsigned long ad
    return is_module_text_address(addr);
    }

    +/* text or data in core kernel or module */
    +int kernel_address(unsigned long addr)
    +{
    + return core_kernel_address(addr) || is_module_address(addr);
    +}
    +
    /*
    * On some architectures (PPC64, IA64) function pointers
    * are actually only tokens to some data that then holds the

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