From: Ze Gao <zegao2021@gmail.com>
Date: Wed, 17 May 2023 11:45:09 +0800
Subject: [PATCH] rethook, fprobe: do not trace rethook related functions
References: bsc#1012628
Patch-mainline: 6.3.4
Git-commit: 571a2a50a8fc546145ffd3bf673547e9fe128ed2

commit 571a2a50a8fc546145ffd3bf673547e9fe128ed2 upstream.

These functions are already marked as NOKPROBE to prevent recursion and
we have the same reason to blacklist them if rethook is used with fprobe,
since they are beyond the recursion-free region ftrace can guard.

Link: https://lore.kernel.org/all/20230517034510.15639-5-zegao@tencent.com/

Fixes: f3a112c0c40d ("x86,rethook,kprobes: Replace kretprobe with rethook on x86")
Signed-off-by: Ze Gao <zegao@tencent.com>
Reviewed-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Acked-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Cc: stable@vger.kernel.org
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
 arch/riscv/kernel/probes/Makefile | 2 ++
 arch/s390/kernel/Makefile         | 1 +
 arch/x86/kernel/Makefile          | 1 +
 3 files changed, 4 insertions(+)

diff --git a/arch/riscv/kernel/probes/Makefile b/arch/riscv/kernel/probes/Makefile
index c40139e9..8265ff49 100644
--- a/arch/riscv/kernel/probes/Makefile
+++ b/arch/riscv/kernel/probes/Makefile
@@ -4,3 +4,5 @@ obj-$(CONFIG_RETHOOK)		+= rethook.o rethook_trampoline.o
 obj-$(CONFIG_KPROBES_ON_FTRACE)	+= ftrace.o
 obj-$(CONFIG_UPROBES)		+= uprobes.o decode-insn.o simulate-insn.o
 CFLAGS_REMOVE_simulate-insn.o = $(CC_FLAGS_FTRACE)
+CFLAGS_REMOVE_rethook.o = $(CC_FLAGS_FTRACE)
+CFLAGS_REMOVE_rethook_trampoline.o = $(CC_FLAGS_FTRACE)
diff --git a/arch/s390/kernel/Makefile b/arch/s390/kernel/Makefile
index 8983837b..6b2a051e 100644
--- a/arch/s390/kernel/Makefile
+++ b/arch/s390/kernel/Makefile
@@ -10,6 +10,7 @@ CFLAGS_REMOVE_ftrace.o		= $(CC_FLAGS_FTRACE)
 
 # Do not trace early setup code
 CFLAGS_REMOVE_early.o		= $(CC_FLAGS_FTRACE)
+CFLAGS_REMOVE_rethook.o		= $(CC_FLAGS_FTRACE)
 
 endif
 
diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile
index dd61752f..4070a01c 100644
--- a/arch/x86/kernel/Makefile
+++ b/arch/x86/kernel/Makefile
@@ -17,6 +17,7 @@ CFLAGS_REMOVE_ftrace.o = -pg
 CFLAGS_REMOVE_early_printk.o = -pg
 CFLAGS_REMOVE_head64.o = -pg
 CFLAGS_REMOVE_sev.o = -pg
+CFLAGS_REMOVE_rethook.o = -pg
 endif
 
 KASAN_SANITIZE_head$(BITS).o				:= n
-- 
2.35.3