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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
Download Patch File Download Diff File Expand all files Collapse all files

18
include/linux/kprobes.h
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@@ -188,15 +188,23 @@ extern void arch_prepare_kretprobe(struct kretprobe_instance *ri,
struct pt_regs *regs);
extern int arch_trampoline_kprobe(struct kprobe *p);
void kretprobe_trampoline(void);
/*
* Since some architecture uses structured function pointer,
* use dereference_function_descriptor() to get real function address.
*/
static nokprobe_inline void *kretprobe_trampoline_addr(void)
{
return dereference_kernel_function_descriptor(kretprobe_trampoline);
}
/* If the trampoline handler called from a kprobe, use this version */
unsigned long __kretprobe_trampoline_handler(struct pt_regs *regs,
void *trampoline_address,
void *frame_pointer);
void *frame_pointer);
static nokprobe_inline
unsigned long kretprobe_trampoline_handler(struct pt_regs *regs,
void *trampoline_address,
void *frame_pointer)
void *frame_pointer)
{
unsigned long ret;
/*
@@ -205,7 +213,7 @@ unsigned long kretprobe_trampoline_handler(struct pt_regs *regs,
* be running at this point.
*/
kprobe_busy_begin();
ret = __kretprobe_trampoline_handler(regs, trampoline_address, frame_pointer);
ret = __kretprobe_trampoline_handler(regs, frame_pointer);
kprobe_busy_end();
return ret;