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fprobe: Skip exit_handler if entry_handler returns !0

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Skip hooking function return and calling exit_handler if the
entry_handler() returns !0.

Link: https://lkml.kernel.org/r/167526699798.433354.10998365726830117303.stgit@mhiramat.roam.corp.google.com

Cc: Florent Revest <revest@chromium.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
This commit is contained in:
Masami Hiramatsu (Google)
2023-02-02 00:56:38 +09:00
committed by Steven Rostedt (Google)
parent 7e7ef1bfe5
commit 39d954200b
5 changed files with 32 additions and 13 deletions
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5
samples/fprobe/fprobe_example.c
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@@ -48,8 +48,8 @@ static void show_backtrace(void)
stack_trace_print(stacks, len, 24);
}
static void sample_entry_handler(struct fprobe *fp, unsigned long ip,
struct pt_regs *regs, void *data)
static int sample_entry_handler(struct fprobe *fp, unsigned long ip,
struct pt_regs *regs, void *data)
{
if (use_trace)
/*
@@ -62,6 +62,7 @@ static void sample_entry_handler(struct fprobe *fp, unsigned long ip,
nhit++;
if (stackdump)
show_backtrace();
return 0;
}
static void sample_exit_handler(struct fprobe *fp, unsigned long ip, struct pt_regs *regs,