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From: Masami Hiramatsu <mhiramat@kernel.org>
To: Steven Rostedt <rostedt@goodmis.org>, Ingo Molnar <mingo@kernel.org>
Cc: X86 ML <x86@kernel.org>, Masami Hiramatsu <mhiramat@kernel.org>,
	Daniel Xu <dxu@dxuuu.xyz>,
	linux-kernel@vger.kernel.org, bpf@vger.kernel.org,
	kuba@kernel.org, mingo@redhat.com, ast@kernel.org,
	tglx@linutronix.de, kernel-team@fb.com, yhs@fb.com,
	Josh Poimboeuf <jpoimboe@redhat.com>,
	linux-ia64@vger.kernel.org,
	Abhishek Sagar <sagar.abhishek@gmail.com>,
	Andrii Nakryiko <andrii.nakryiko@gmail.com>
Subject: [PATCH -tip v7 08/13] arm: kprobes: Make a space for regs->ARM_pc at kretprobe_trampoline
Date: Thu, 27 May 2021 15:40:20 +0900	[thread overview]
Message-ID: <162209761982.436794.14123705787131288439.stgit@devnote2> (raw)
In-Reply-To: <162209754288.436794.3904335049560916855.stgit@devnote2>

Change kretprobe_trampoline to make a space for regs->ARM_pc so that
kretprobe_trampoline_handler can call instruction_pointer_set()
safely.

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
---
 arch/arm/probes/kprobes/core.c |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm/probes/kprobes/core.c b/arch/arm/probes/kprobes/core.c
index 1782b41df095..5f3c2b42787f 100644
--- a/arch/arm/probes/kprobes/core.c
+++ b/arch/arm/probes/kprobes/core.c
@@ -397,11 +397,13 @@ int __kprobes kprobe_exceptions_notify(struct notifier_block *self,
 void __naked __kprobes kretprobe_trampoline(void)
 {
 	__asm__ __volatile__ (
+		"sub	sp, sp, #16		\n\t"
 		"stmdb	sp!, {r0 - r11}		\n\t"
 		"mov	r0, sp			\n\t"
 		"bl	trampoline_handler	\n\t"
 		"mov	lr, r0			\n\t"
 		"ldmia	sp!, {r0 - r11}		\n\t"
+		"add	sp, sp, #16		\n\t"
 #ifdef CONFIG_THUMB2_KERNEL
 		"bx	lr			\n\t"
 #else


  parent reply	other threads:[~2021-05-27  6:40 UTC|newest]

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-27  6:39 [PATCH -tip v7 00/13] kprobes: Fix stacktrace with kretprobes on x86 Masami Hiramatsu
2021-05-27  6:39 ` [PATCH -tip v7 01/13] ia64: kprobes: Fix to pass correct trampoline address to the handler Masami Hiramatsu
2021-05-27  6:39 ` [PATCH -tip v7 02/13] kprobes: treewide: Replace arch_deref_entry_point() with dereference_symbol_descriptor() Masami Hiramatsu
2021-05-27  6:39 ` [PATCH -tip v7 03/13] kprobes: treewide: Remove trampoline_address from kretprobe_trampoline_handler() Masami Hiramatsu
2021-06-14 15:46   ` Naveen N. Rao
2021-06-15  0:06     ` Masami Hiramatsu
2021-05-27  6:39 ` [PATCH -tip v7 04/13] kprobes: Add kretprobe_find_ret_addr() for searching return address Masami Hiramatsu
2021-05-27  6:39 ` [PATCH -tip v7 05/13] x86/kprobes: Add UNWIND_HINT_FUNC on kretprobe_trampoline code Masami Hiramatsu
2021-05-27  6:40 ` [PATCH -tip v7 06/13] ARC: Add instruction_pointer_set() API Masami Hiramatsu
2021-05-27  6:40 ` [PATCH -tip v7 07/13] ia64: " Masami Hiramatsu
2021-05-27  6:40 ` Masami Hiramatsu [this message]
2021-05-27  6:40 ` [PATCH -tip v7 09/13] kprobes: Setup instruction pointer in __kretprobe_trampoline_handler Masami Hiramatsu
2021-06-17  4:39   ` Josh Poimboeuf
2021-06-17  4:40     ` Josh Poimboeuf
2021-06-17 14:40       ` Masami Hiramatsu
2021-06-17 15:02         ` Masami Hiramatsu
2021-06-17 17:45           ` Andrii Nakryiko
2021-06-17 18:21             ` Josh Poimboeuf
2021-06-17 18:31               ` Andrii Nakryiko
2021-06-17 19:26                 ` Josh Poimboeuf
2021-06-17 19:46                   ` Andrii Nakryiko
2021-06-18  0:33                     ` Masami Hiramatsu
2021-06-18  1:03                       ` Josh Poimboeuf
2021-06-17 23:58               ` Masami Hiramatsu
2021-06-18  0:58                 ` Josh Poimboeuf
2021-05-27  6:40 ` [PATCH -tip v7 10/13] x86/kprobes: Push a fake return address at kretprobe_trampoline Masami Hiramatsu
2021-06-17  4:41   ` Josh Poimboeuf
2021-05-27  6:40 ` [PATCH -tip v7 11/13] x86/unwind: Recover kretprobe trampoline entry Masami Hiramatsu
2021-06-17  4:41   ` Josh Poimboeuf
2021-05-27  6:40 ` [PATCH -tip v7 12/13] tracing: Show kretprobe unknown indicator only for kretprobe_trampoline Masami Hiramatsu
2021-05-27  6:41 ` [PATCH -tip v7 13/13] x86/kprobes: Fixup return address in generic trampoline handler Masami Hiramatsu
2021-05-27 16:41 ` [PATCH -tip v7 00/13] kprobes: Fix stacktrace with kretprobes on x86 Andrii Nakryiko
2021-06-10  3:40 ` Masami Hiramatsu

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