From: Masami Hiramatsu <mhiramat@kernel.org> To: Masami Hiramatsu <mhiramat@kernel.org> Cc: Steven Rostedt <rostedt@goodmis.org>, Ingo Molnar <mingo@kernel.org>, X86 ML <x86@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 Subject: Re: [PATCH -tip v3 05/11] x86/kprobes: Add UNWIND_HINT_FUNC on kretprobe_trampoline code Date: Sat, 20 Mar 2021 21:16:16 +0900 [thread overview] Message-ID: <20210320211616.a976fc66d0c51e13d3121e2f@kernel.org> (raw) In-Reply-To: <161615655969.306069.4545805781593088526.stgit@devnote2> On Fri, 19 Mar 2021 21:22:39 +0900 Masami Hiramatsu <mhiramat@kernel.org> wrote: > From: Josh Poimboeuf <jpoimboe@redhat.com> > > Add UNWIND_HINT_FUNC on kretporbe_trampoline code so that ORC > information is generated on the kretprobe_trampoline correctly. > Test bot also found a new warning for this. > >> arch/x86/kernel/kprobes/core.o: warning: objtool: kretprobe_trampoline()+0x25: call without frame pointer save/setup With CONFIG_FRAME_POINTER=y. Of course this can be fixed with additional "push %bp; mov %sp, %bp" before calling trampoline_handler. But actually we know that this function has a bit special stack frame too. Can I recover STACK_FRAME_NON_STANDARD(kretprobe_trampoline) when CONFIG_FRAME_POINTER=y ? Thank you, > Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com> > --- > [MH] Add patch description. > --- > arch/x86/include/asm/unwind_hints.h | 5 +++++ > arch/x86/kernel/kprobes/core.c | 3 ++- > 2 files changed, 7 insertions(+), 1 deletion(-) > > diff --git a/arch/x86/include/asm/unwind_hints.h b/arch/x86/include/asm/unwind_hints.h > index 8e574c0afef8..8b33674288ea 100644 > --- a/arch/x86/include/asm/unwind_hints.h > +++ b/arch/x86/include/asm/unwind_hints.h > @@ -52,6 +52,11 @@ > UNWIND_HINT sp_reg=ORC_REG_SP sp_offset=8 type=UNWIND_HINT_TYPE_FUNC > .endm > > +#else > + > +#define UNWIND_HINT_FUNC \ > + UNWIND_HINT(ORC_REG_SP, 8, UNWIND_HINT_TYPE_FUNC, 0) > + > #endif /* __ASSEMBLY__ */ > > #endif /* _ASM_X86_UNWIND_HINTS_H */ > diff --git a/arch/x86/kernel/kprobes/core.c b/arch/x86/kernel/kprobes/core.c > index 427d648fffcd..b31058a152b6 100644 > --- a/arch/x86/kernel/kprobes/core.c > +++ b/arch/x86/kernel/kprobes/core.c > @@ -772,6 +772,7 @@ asm( > /* We don't bother saving the ss register */ > #ifdef CONFIG_X86_64 > " pushq %rsp\n" > + UNWIND_HINT_FUNC > " pushfq\n" > SAVE_REGS_STRING > " movq %rsp, %rdi\n" > @@ -782,6 +783,7 @@ asm( > " popfq\n" > #else > " pushl %esp\n" > + UNWIND_HINT_FUNC > " pushfl\n" > SAVE_REGS_STRING > " movl %esp, %eax\n" > @@ -795,7 +797,6 @@ asm( > ".size kretprobe_trampoline, .-kretprobe_trampoline\n" > ); > NOKPROBE_SYMBOL(kretprobe_trampoline); > -STACK_FRAME_NON_STANDARD(kretprobe_trampoline); > > > /* > -- Masami Hiramatsu <mhiramat@kernel.org>
WARNING: multiple messages have this Message-ID (diff)
From: Masami Hiramatsu <mhiramat@kernel.org> To: Masami Hiramatsu <mhiramat@kernel.org> Cc: Steven Rostedt <rostedt@goodmis.org>, Ingo Molnar <mingo@kernel.org>, X86 ML <x86@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 Subject: Re: [PATCH -tip v3 05/11] x86/kprobes: Add UNWIND_HINT_FUNC on kretprobe_trampoline code Date: Sat, 20 Mar 2021 12:16:16 +0000 [thread overview] Message-ID: <20210320211616.a976fc66d0c51e13d3121e2f@kernel.org> (raw) In-Reply-To: <161615655969.306069.4545805781593088526.stgit@devnote2> On Fri, 19 Mar 2021 21:22:39 +0900 Masami Hiramatsu <mhiramat@kernel.org> wrote: > From: Josh Poimboeuf <jpoimboe@redhat.com> > > Add UNWIND_HINT_FUNC on kretporbe_trampoline code so that ORC > information is generated on the kretprobe_trampoline correctly. > Test bot also found a new warning for this. > >> arch/x86/kernel/kprobes/core.o: warning: objtool: kretprobe_trampoline()+0x25: call without frame pointer save/setup With CONFIG_FRAME_POINTER=y. Of course this can be fixed with additional "push %bp; mov %sp, %bp" before calling trampoline_handler. But actually we know that this function has a bit special stack frame too. Can I recover STACK_FRAME_NON_STANDARD(kretprobe_trampoline) when CONFIG_FRAME_POINTER=y ? Thank you, > Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com> > --- > [MH] Add patch description. > --- > arch/x86/include/asm/unwind_hints.h | 5 +++++ > arch/x86/kernel/kprobes/core.c | 3 ++- > 2 files changed, 7 insertions(+), 1 deletion(-) > > diff --git a/arch/x86/include/asm/unwind_hints.h b/arch/x86/include/asm/unwind_hints.h > index 8e574c0afef8..8b33674288ea 100644 > --- a/arch/x86/include/asm/unwind_hints.h > +++ b/arch/x86/include/asm/unwind_hints.h > @@ -52,6 +52,11 @@ > UNWIND_HINT sp_reg=ORC_REG_SP sp_offset=8 type=UNWIND_HINT_TYPE_FUNC > .endm > > +#else > + > +#define UNWIND_HINT_FUNC \ > + UNWIND_HINT(ORC_REG_SP, 8, UNWIND_HINT_TYPE_FUNC, 0) > + > #endif /* __ASSEMBLY__ */ > > #endif /* _ASM_X86_UNWIND_HINTS_H */ > diff --git a/arch/x86/kernel/kprobes/core.c b/arch/x86/kernel/kprobes/core.c > index 427d648fffcd..b31058a152b6 100644 > --- a/arch/x86/kernel/kprobes/core.c > +++ b/arch/x86/kernel/kprobes/core.c > @@ -772,6 +772,7 @@ asm( > /* We don't bother saving the ss register */ > #ifdef CONFIG_X86_64 > " pushq %rsp\n" > + UNWIND_HINT_FUNC > " pushfq\n" > SAVE_REGS_STRING > " movq %rsp, %rdi\n" > @@ -782,6 +783,7 @@ asm( > " popfq\n" > #else > " pushl %esp\n" > + UNWIND_HINT_FUNC > " pushfl\n" > SAVE_REGS_STRING > " movl %esp, %eax\n" > @@ -795,7 +797,6 @@ asm( > ".size kretprobe_trampoline, .-kretprobe_trampoline\n" > ); > NOKPROBE_SYMBOL(kretprobe_trampoline); > -STACK_FRAME_NON_STANDARD(kretprobe_trampoline); > > > /* > -- Masami Hiramatsu <mhiramat@kernel.org>
next prev parent reply other threads:[~2021-03-20 12:16 UTC|newest] Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-03-19 12:21 [PATCH -tip v3 00/11] kprobes: Fix stacktrace with kretprobes on x86 Masami Hiramatsu 2021-03-19 12:21 ` Masami Hiramatsu 2021-03-19 12:21 ` [PATCH -tip v3 01/11] ia64: kprobes: Fix to pass correct trampoline address to the handler Masami Hiramatsu 2021-03-19 12:21 ` Masami Hiramatsu 2021-03-19 12:22 ` [PATCH -tip v3 02/11] kprobes: treewide: Replace arch_deref_entry_point() with dereference_function_descriptor() Masami Hiramatsu 2021-03-19 12:22 ` [PATCH -tip v3 02/11] kprobes: treewide: Replace arch_deref_entry_point() with dereference_function_ Masami Hiramatsu 2021-03-19 12:22 ` [PATCH -tip v3 03/11] kprobes: treewide: Remove trampoline_address from kretprobe_trampoline_handler() Masami Hiramatsu 2021-03-19 12:22 ` [PATCH -tip v3 03/11] kprobes: treewide: Remove trampoline_address from kretprobe_trampoline_handler Masami Hiramatsu 2021-03-19 12:22 ` [PATCH -tip v3 04/11] kprobes: Add kretprobe_find_ret_addr() for searching return address Masami Hiramatsu 2021-03-19 12:22 ` Masami Hiramatsu 2021-03-19 12:22 ` [PATCH -tip v3 05/11] x86/kprobes: Add UNWIND_HINT_FUNC on kretprobe_trampoline code Masami Hiramatsu 2021-03-19 12:22 ` Masami Hiramatsu 2021-03-20 12:16 ` Masami Hiramatsu [this message] 2021-03-20 12:16 ` Masami Hiramatsu 2021-03-20 13:05 ` Masami Hiramatsu 2021-03-20 13:05 ` Masami Hiramatsu 2021-03-21 17:52 ` Josh Poimboeuf 2021-03-21 17:52 ` Josh Poimboeuf 2021-03-22 0:08 ` Masami Hiramatsu 2021-03-22 0:08 ` Masami Hiramatsu 2021-03-21 17:50 ` Josh Poimboeuf 2021-03-21 17:50 ` Josh Poimboeuf 2021-03-19 12:22 ` [PATCH -tip v3 06/11] ARC: Add instruction_pointer_set() API Masami Hiramatsu 2021-03-19 12:22 ` Masami Hiramatsu 2021-03-19 12:23 ` [PATCH -tip v3 07/11] ia64: " Masami Hiramatsu 2021-03-19 12:23 ` Masami Hiramatsu 2021-03-20 1:04 ` Masami Hiramatsu 2021-03-20 1:04 ` Masami Hiramatsu 2021-03-19 12:23 ` [PATCH -tip v3 08/11] kprobes: Setup instruction pointer in __kretprobe_trampoline_handler Masami Hiramatsu 2021-03-19 12:23 ` Masami Hiramatsu 2021-03-21 12:54 ` Masami Hiramatsu 2021-03-21 12:54 ` Masami Hiramatsu 2021-03-19 12:23 ` [PATCH -tip v3 09/11] x86/kprobes: Push a fake return address at kretprobe_trampoline Masami Hiramatsu 2021-03-19 12:23 ` Masami Hiramatsu 2021-03-19 12:23 ` [PATCH -tip v3 10/11] x86/unwind: Recover kretprobe trampoline entry Masami Hiramatsu 2021-03-19 12:23 ` Masami Hiramatsu 2021-03-19 12:23 ` [PATCH -tip v3 11/11] tracing: Show kretprobe unknown indicator only for kretprobe_trampoline Masami Hiramatsu 2021-03-19 12:23 ` Masami Hiramatsu
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