commit a7fe2378454cf46cd5e2776d05e72bbe8f0a468c upstream.
The following commit:
Commit e792ff804f49 ("ia64: kprobes: Use generic kretprobe trampoline handler")
Passed the wrong trampoline address to __kretprobe_trampoline_handler(): it passes the descriptor address instead of function entry address.
Pass the right parameter.
Also use correct symbol dereference function to get the function address from 'kretprobe_trampoline' - an IA64 special.
Link: https://lkml.kernel.org/r/163163042696.489837.12551102356265354730.stgit@dev...
Fixes: e792ff804f49 ("ia64: kprobes: Use generic kretprobe trampoline handler") Cc: Josh Poimboeuf jpoimboe@redhat.com Cc: Ingo Molnar mingo@kernel.org Cc: X86 ML x86@kernel.org Cc: Daniel Xu dxu@dxuuu.xyz Cc: Thomas Gleixner tglx@linutronix.de Cc: Borislav Petkov bp@alien8.de Cc: Peter Zijlstra peterz@infradead.org Cc: Abhishek Sagar sagar.abhishek@gmail.com Cc: Andrii Nakryiko andrii.nakryiko@gmail.com Cc: Paul McKenney paulmck@kernel.org Cc: stable@vger.kernel.org Signed-off-by: Masami Hiramatsu mhiramat@kernel.org Signed-off-by: Steven Rostedt (VMware) rostedt@goodmis.org --- arch/ia64/kernel/kprobes.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/arch/ia64/kernel/kprobes.c b/arch/ia64/kernel/kprobes.c index aa41bd5cf9b7..7fc0806bbdc9 100644 --- a/arch/ia64/kernel/kprobes.c +++ b/arch/ia64/kernel/kprobes.c @@ -424,7 +424,7 @@ int __kprobes trampoline_probe_handler(struct kprobe *p, struct pt_regs *regs) struct hlist_node *tmp; unsigned long flags, orig_ret_address = 0; unsigned long trampoline_address = - ((struct fnptr *)kretprobe_trampoline)->ip; + (unsigned long)dereference_function_descriptor(kretprobe_trampoline);
INIT_HLIST_HEAD(&empty_rp); kretprobe_hash_lock(current, &head, &flags); @@ -500,7 +500,7 @@ void __kprobes arch_prepare_kretprobe(struct kretprobe_instance *ri, ri->ret_addr = (kprobe_opcode_t *)regs->b0;
/* 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 */ @@ -1030,14 +1030,14 @@ static struct kprobe trampoline_p = { int __init arch_init_kprobes(void) { trampoline_p.addr = - (kprobe_opcode_t *)((struct fnptr *)kretprobe_trampoline)->ip; + dereference_function_descriptor(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;