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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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kernel/trace/fprobe.c
+9 -5
View File
@@ -27,7 +27,7 @@ static void fprobe_handler(unsigned long ip, unsigned long parent_ip,
struct rethook_node *rh = NULL;
struct fprobe *fp;
void *entry_data = NULL;
int bit;
int bit, ret;
fp = container_of(ops, struct fprobe, ops);
if (fprobe_disabled(fp))
@@ -52,11 +52,15 @@ static void fprobe_handler(unsigned long ip, unsigned long parent_ip,
}
if (fp->entry_handler)
fp->entry_handler(fp, ip, ftrace_get_regs(fregs), entry_data);
if (rh)
rethook_hook(rh, ftrace_get_regs(fregs), true);
ret = fp->entry_handler(fp, ip, ftrace_get_regs(fregs), entry_data);
/* If entry_handler returns !0, nmissed is not counted. */
if (rh) {
if (ret)
rethook_recycle(rh);
else
rethook_hook(rh, ftrace_get_regs(fregs), true);
}
out:
ftrace_test_recursion_unlock(bit);
}