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>
Subject: [PATCH -tip v2 01/10] ia64: kprobes: Fix to pass correct trampoline address to the handler
Date: Fri, 12 Mar 2021 15:41:55 +0900 [thread overview]
Message-ID: <161553131501.1038734.10920079868916413943.stgit@devnote2> (raw)
In-Reply-To: <161553130371.1038734.7661319550287837734.stgit@devnote2>
Commit e792ff804f49 ("ia64: kprobes: Use generic kretprobe trampoline handler")
missed to pass the wrong trampoline address (it passes the descriptor address
instead of function entry address).
This fixes it to pass correct trampoline address to __kretprobe_trampoline_handler().
This also changes to use correct symbol dereference function to get the
function address from the kretprobe_trampoline.
Fixes: e792ff804f49 ("ia64: kprobes: Use generic kretprobe trampoline handler")
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
---
arch/ia64/kernel/kprobes.c | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)
diff --git a/arch/ia64/kernel/kprobes.c b/arch/ia64/kernel/kprobes.c
index fc1ff8a4d7de..006fbc1d7ae9 100644
--- a/arch/ia64/kernel/kprobes.c
+++ b/arch/ia64/kernel/kprobes.c
@@ -398,7 +398,8 @@ static void kretprobe_trampoline(void)
int __kprobes trampoline_probe_handler(struct kprobe *p, struct pt_regs *regs)
{
- regs->cr_iip = __kretprobe_trampoline_handler(regs, kretprobe_trampoline, NULL);
+ regs->cr_iip = __kretprobe_trampoline_handler(regs,
+ dereference_function_descriptor(kretprobe_trampoline), NULL);
/*
* By returning a non-zero value, we are telling
* kprobe_handler() that we don't want the post_handler
@@ -414,7 +415,7 @@ void __kprobes arch_prepare_kretprobe(struct kretprobe_instance *ri,
ri->fp = NULL;
/* Replace the return addr with trampoline addr */
- regs->b0 = ((struct fnptr *)kretprobe_trampoline)->ip;
+ regs->b0 = (unsigned long)dereference_function_descriptor(kretprobe_trampoline);
}
/* Check the instruction in the slot is break */
@@ -918,14 +919,14 @@ static struct kprobe trampoline_p = {
int __init arch_init_kprobes(void)
{
trampoline_p.addr =
- (kprobe_opcode_t *)((struct fnptr *)kretprobe_trampoline)->ip;
+ dereference_function_description(kretprobe_trampoline);
return register_kprobe(&trampoline_p);
}
int __kprobes arch_trampoline_kprobe(struct kprobe *p)
{
if (p->addr ==
- (kprobe_opcode_t *)((struct fnptr *)kretprobe_trampoline)->ip)
+ dereference_function_descriptor(kretprobe_trampoline))
return 1;
return 0;
next prev parent reply other threads:[~2021-03-12 6:42 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-12 6:41 [PATCH -tip v2 00/10] kprobes: Fix stacktrace with kretprobes Masami Hiramatsu
2021-03-12 6:41 ` Masami Hiramatsu [this message]
2021-03-12 6:42 ` [PATCH -tip v2 02/10] kprobes: treewide: Replace arch_deref_entry_point() with dereference_function_descriptor() Masami Hiramatsu
2021-05-24 9:26 ` Naveen N. Rao
2021-05-24 23:41 ` Masami Hiramatsu
2021-03-12 6:42 ` [PATCH -tip v2 03/10] kprobes: treewide: Remove trampoline_address from kretprobe_trampoline_handler() Masami Hiramatsu
2021-03-12 6:42 ` [PATCH -tip v2 04/10] kprobes: stacktrace: Recover the address changed by kretprobe Masami Hiramatsu
2021-03-17 0:27 ` Masami Hiramatsu
2021-03-12 6:42 ` [PATCH -tip v2 05/10] x86/kprobes: Add UNWIND_HINT_FUNC on kretprobe_trampoline code Masami Hiramatsu
2021-03-12 6:42 ` [PATCH -tip v2 06/10] ARC: Add instruction_pointer_set() API Masami Hiramatsu
2021-03-12 6:43 ` [PATCH -tip v2 07/10] ia64: " Masami Hiramatsu
2021-03-12 6:43 ` [PATCH -tip v2 08/10] kprobes: Setup instruction pointer in __kretprobe_trampoline_handler Masami Hiramatsu
2021-03-12 6:43 ` [PATCH -tip v2 09/10] x86/unwind/orc: Fixup kretprobe trampoline entry Masami Hiramatsu
2021-03-12 6:43 ` [PATCH -tip v2 10/10] tracing: Remove kretprobe unknown indicator from stacktrace Masami Hiramatsu
2021-03-12 18:56 ` [PATCH -tip v2 00/10] kprobes: Fix stacktrace with kretprobes Daniel Xu
2021-03-16 2:30 ` Josh Poimboeuf
2021-03-16 6:30 ` Masami Hiramatsu
2021-05-17 21:06 ` Andrii Nakryiko
2021-05-23 14:22 ` Masami Hiramatsu
2021-05-24 17:49 ` Andrii Nakryiko
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