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arm: kprobes: Make space for instruction pointer on stack

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Since arm's __kretprobe_trampoline() saves partial 'pt_regs' on the
stack, 'regs->ARM_pc' (instruction pointer) is not accessible from
the kretprobe handler. This means if instruction_pointer_set() is
used from kretprobe handler, it will break the data on the stack.

Make space for instruction pointer (ARM_pc) on the stack in the
__kretprobe_trampoline() for fixing this problem.

Link: https://lkml.kernel.org/r/163163052262.489837.10327621053231461255.stgit@devnote2

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Masami Hiramatsu 2021-09-14 23:42:02 +09:00 committed by Steven Rostedt (VMware)
parent c1f76fe58f
commit 7391dd1902
1 changed files with 2 additions and 0 deletions
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2
arch/arm/probes/kprobes/core.c
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@ -376,11 +376,13 @@ 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