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Subject[tip:perf/urgent] kprobes/x86: Blacklist non-attachable interrupt functions
Commit-ID:  a50480cb6d61d5c5fc13308479407b628b6bc1c5
Gitweb: https://git.kernel.org/tip/a50480cb6d61d5c5fc13308479407b628b6bc1c5
Author: Andrea Righi <righi.andrea@gmail.com>
AuthorDate: Thu, 6 Dec 2018 10:56:48 +0100
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Thu, 6 Dec 2018 16:52:03 +0100

kprobes/x86: Blacklist non-attachable interrupt functions

These interrupt functions are already non-attachable by kprobes.
Blacklist them explicitly so that they can show up in
/sys/kernel/debug/kprobes/blacklist and tools like BCC can use this
additional information.

Signed-off-by: Andrea Righi <righi.andrea@gmail.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: David S. Miller <davem@davemloft.net>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Yonghong Song <yhs@fb.com>
Link: http://lkml.kernel.org/r/20181206095648.GA8249@Dell
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
arch/x86/entry/entry_64.S | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S
index ce25d84023c0..1f0efdb7b629 100644
--- a/arch/x86/entry/entry_64.S
+++ b/arch/x86/entry/entry_64.S
@@ -566,6 +566,7 @@ ENTRY(interrupt_entry)

ret
END(interrupt_entry)
+_ASM_NOKPROBE(interrupt_entry)


/* Interrupt entry/exit. */
@@ -766,6 +767,7 @@ native_irq_return_ldt:
jmp native_irq_return_iret
#endif
END(common_interrupt)
+_ASM_NOKPROBE(common_interrupt)

/*
* APIC interrupts.
@@ -780,6 +782,7 @@ ENTRY(\sym)
call \do_sym /* rdi points to pt_regs */
jmp ret_from_intr
END(\sym)
+_ASM_NOKPROBE(\sym)
.endm

/* Make sure APIC interrupt handlers end up in the irqentry section: */
@@ -960,6 +963,7 @@ ENTRY(\sym)

jmp error_exit
.endif
+_ASM_NOKPROBE(\sym)
END(\sym)
.endm

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