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于 2014/12/19 13:37, Li Bin 写道:
> The execution flow redirection related implemention in the livepatch
> ftrace handler is depended on the specific architecture. This patch
> introduces klp_arch_set_pc(like kgdb_arch_set_pc) interface to change
> the pt_regs.
>
> Signed-off-by: Li Bin <huawei.libin@xxxxxxxxxx>
> ---
> arch/x86/include/asm/livepatch.h | 5 +++++
> kernel/livepatch/core.c | 2 +-
> 2 files changed, 6 insertions(+), 1 deletions(-)
>
> diff --git a/arch/x86/include/asm/livepatch.h b/arch/x86/include/asm/livepatch.h
> index c2ae592..4cdec4e 100644
> --- a/arch/x86/include/asm/livepatch.h
> +++ b/arch/x86/include/asm/livepatch.h
> @@ -21,6 +21,7 @@
> #define _ASM_X86_LIVEPATCH_H
>
> #include <linux/module.h>
> +#include <linux/ftrace.h>
>
> #ifdef CONFIG_LIVE_PATCHING
> #ifndef CC_USING_FENTRY
> @@ -29,6 +30,10 @@
> extern int klp_write_module_reloc(struct module *mod, unsigned long type,
> unsigned long loc, unsigned long value);
>
> +static inline void klp_arch_set_pc(struct pt_regs *regs, unsigned long ip)
> +{
> + regs->ip = ip;
> +}
> #else
> #error Live patching support is disabled; check CONFIG_LIVE_PATCHING
> #endif
> diff --git a/kernel/livepatch/core.c b/kernel/livepatch/core.c
> index 0004a71..c4c04fd 100644
> --- a/kernel/livepatch/core.c
> +++ b/kernel/livepatch/core.c
> @@ -271,7 +271,7 @@ static void notrace klp_ftrace_handler(unsigned long ip,
> {
> struct klp_func *func = ops->private;
>
> - regs->ip = (unsigned long)func->new_func;
> + klp_arch_set_pc(regs, (unsigned long)func->new_func);
> }
>
> static int klp_disable_func(struct klp_func *func)
>
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