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kprobes: Add kretprobe_find_ret_addr() for searching return address

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Introduce kretprobe_find_ret_addr() and is_kretprobe_trampoline().
These APIs will be used by the ORC stack unwinder and ftrace, so that
they can check whether the given address points kretprobe trampoline
code and query the correct return address in that case.

Link: https://lkml.kernel.org/r/163163046461.489837.1044778356430293962.stgit@devnote2

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Tested-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Masami Hiramatsu
2021-09-14 23:41:04 +09:00
committed by Steven Rostedt (VMware)
parent adf8a61a94
commit 03bac0df28
2 changed files with 107 additions and 28 deletions
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22
include/linux/kprobes.h
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@@ -505,6 +505,28 @@ static inline bool is_kprobe_optinsn_slot(unsigned long addr)
}
#endif /* !CONFIG_OPTPROBES */
#ifdef CONFIG_KRETPROBES
static nokprobe_inline bool is_kretprobe_trampoline(unsigned long addr)
{
return (void *)addr == kretprobe_trampoline_addr();
}
unsigned long kretprobe_find_ret_addr(struct task_struct *tsk, void *fp,
struct llist_node **cur);
#else
static nokprobe_inline bool is_kretprobe_trampoline(unsigned long addr)
{
return false;
}
static nokprobe_inline
unsigned long kretprobe_find_ret_addr(struct task_struct *tsk, void *fp,
struct llist_node **cur)
{
return 0;
}
#endif
/* Returns true if kprobes handled the fault */
static nokprobe_inline bool kprobe_page_fault(struct pt_regs *regs,
unsigned int trap)