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| author | Masami Hiramatsu <mhiramat@kernel.org> | 2021-09-14 17:41:04 +0300 |
|---|---|---|
| committer | Steven Rostedt (VMware) <rostedt@goodmis.org> | 2021-10-01 04:24:06 +0300 |
| commit | 03bac0df2886882c43e6d0bfff9dee84a184fc7e (patch) | |
| tree | d0c76f97fdbde14a6a8a755c50c50111a03bd335 /include/linux/kprobes.h | |
| parent | adf8a61a940c49fea6fab9c3865f2b69b8ceef28 (diff) | |
| download | linux-03bac0df2886882c43e6d0bfff9dee84a184fc7e.tar.xz | |
kprobes: Add kretprobe_find_ret_addr() for searching return address
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>
Diffstat (limited to 'include/linux/kprobes.h')
| -rw-r--r-- | include/linux/kprobes.h | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/include/linux/kprobes.h b/include/linux/kprobes.h index b6b2370f4a4c..6d47a9da1e0a 100644 --- a/include/linux/kprobes.h +++ b/include/linux/kprobes.h @@ -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) |