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kprobes: treewide: Remove trampoline_address from kretprobe_trampoline_handler()

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The __kretprobe_trampoline_handler() callback, called from low level
arch kprobes methods, has the 'trampoline_address' parameter, which is
entirely superfluous as it basically just replicates:

  dereference_kernel_function_descriptor(kretprobe_trampoline)

In fact we had bugs in arch code where it wasn't replicated correctly.

So remove this superfluous parameter and use kretprobe_trampoline_addr()
instead.

Link: https://lkml.kernel.org/r/163163044546.489837.13505751885476015002.stgit@devnote2

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Tested-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Masami Hiramatsu
2021-09-14 23:40:45 +09:00
committed by Steven Rostedt (VMware)
parent f2ec8d9a3b
commit 96fed8ac2b
16 changed files with 29 additions and 27 deletions
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3
kernel/kprobes.c
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@@ -1864,7 +1864,6 @@ static struct notifier_block kprobe_exceptions_nb = {
#ifdef CONFIG_KRETPROBES
unsigned long __kretprobe_trampoline_handler(struct pt_regs *regs,
void *trampoline_address,
void *frame_pointer)
{
kprobe_opcode_t *correct_ret_addr = NULL;
@@ -1879,7 +1878,7 @@ unsigned long __kretprobe_trampoline_handler(struct pt_regs *regs,
BUG_ON(ri->fp != frame_pointer);
if (ri->ret_addr != trampoline_address) {
if (ri->ret_addr != kretprobe_trampoline_addr()) {
correct_ret_addr = ri->ret_addr;
/*
* This is the real return address. Any other