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Date: Mon, 26 May 2014 20:48:03 +0900
From: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To: "Suzuki K. Poulose" <suzuki@...ibm.com>
Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>,
Paul Mackerras <paulus@...ba.org>,
Tony Luck <tony.luck@...il.com>,
Jeremy Fitzhardinge <jeremy@...p.org>,
linux-ia64@...r.kernel.org, sparse@...isli.org,
"H. Peter Anvin" <hpa@...or.com>,
Thomas Gleixner <tglx@...utronix.de>,
linux-tip-commits@...r.kernel.org, anil.s.keshavamurthy@...el.com,
Ingo Molnar <mingo@...nel.org>,
Fenghua Yu <fenghua.yu@...el.com>,
Arnd Bergmann <arnd@...db.de>,
Rusty Russell <rusty@...tcorp.com.au>,
Chris Wright <chrisw@...s-sol.org>,
yrl.pp-manager.tt@...achi.com, akataria@...are.com,
Tony Luck <tony.luck@...el.com>,
Kevin Hao <haokexin@...il.com>,
Linus Torvalds <torvalds@...ux-foundation.org>,
rdunlap@...radead.org,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
dl9pf@....de, Andrew Morton <akpm@...ux-foundation.org>,
linuxppc-dev@...ts.ozlabs.org,
"David S. Miller" <davem@...emloft.net>
Subject: Re: [RFT PATCH -next ] [BUGFIX] kprobes: Fix "Failed to find blacklist"
error on ia64 and ppc64
(2014/05/26 20:25), Suzuki K. Poulose wrote:
> On 05/07/2014 05:25 PM, Masami Hiramatsu wrote:
>> On ia64 and ppc64, the function pointer does not point the
>> entry address of the function, but the address of function
>> discriptor (which contains the entry address and misc
>> data.) Since the kprobes passes the function pointer stored
>> by NOKPROBE_SYMBOL() to kallsyms_lookup_size_offset() for
>> initalizing its blacklist, it fails and reports many errors
>> as below.
>>
>> Failed to find blacklist 0001013168300000
>> Failed to find blacklist 0001013000f0a000
>> Failed to find blacklist 000101315f70a000
>> Failed to find blacklist 000101324c80a000
>> Failed to find blacklist 0001013063f0a000
>> Failed to find blacklist 000101327800a000
>> Failed to find blacklist 0001013277f0a000
>> Failed to find blacklist 000101315a70a000
>> Failed to find blacklist 0001013277e0a000
>> Failed to find blacklist 000101305a20a000
>> Failed to find blacklist 0001013277d0a000
>> Failed to find blacklist 00010130bdc0a000
>> Failed to find blacklist 00010130dc20a000
>> Failed to find blacklist 000101309a00a000
>> Failed to find blacklist 0001013277c0a000
>> Failed to find blacklist 0001013277b0a000
>> Failed to find blacklist 0001013277a0a000
>> Failed to find blacklist 000101327790a000
>> Failed to find blacklist 000101303140a000
>> Failed to find blacklist 0001013a3280a000
>>
>> To fix this bug, this introduces function_entry() macro to
>> retrieve the entry address from the given function pointer,
>> and uses it in NOKPROBE_SYMBOL().
>>
>>
>> Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
>> Reported-by: Tony Luck <tony.luck@...il.com>
>> Cc: Tony Luck <tony.luck@...el.com>
>> Cc: Fenghua Yu <fenghua.yu@...el.com>
>> Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
>> Cc: Paul Mackerras <paulus@...ba.org>
>> Cc: Ananth N Mavinakayanahalli <ananth@...ibm.com>
>> Cc: Kevin Hao <haokexin@...il.com>
>> Cc: linux-ia64@...r.kernel.org
>> Cc: linux-kernel@...r.kernel.org
>> Cc: linuxppc-dev@...ts.ozlabs.org
>> ---
>> arch/ia64/include/asm/types.h | 2 ++
>> arch/powerpc/include/asm/types.h | 11 +++++++++++
>> include/linux/kprobes.h | 3 ++-
>> include/linux/types.h | 4 ++++
>> 4 files changed, 19 insertions(+), 1 deletion(-)
>>
>> diff --git a/arch/ia64/include/asm/types.h b/arch/ia64/include/asm/types.h
>> index 4c351b1..6ab7b6c 100644
>> --- a/arch/ia64/include/asm/types.h
>> +++ b/arch/ia64/include/asm/types.h
>> @@ -27,5 +27,7 @@ struct fnptr {
>> unsigned long gp;
>> };
>>
>> +#define constant_function_entry(fn) (((struct fnptr *)(fn))->ip)
>> +
>> #endif /* !__ASSEMBLY__ */
>> #endif /* _ASM_IA64_TYPES_H */
>> diff --git a/arch/powerpc/include/asm/types.h b/arch/powerpc/include/asm/types.h
>> index bfb6ded..fd297b8 100644
>> --- a/arch/powerpc/include/asm/types.h
>> +++ b/arch/powerpc/include/asm/types.h
>> @@ -25,6 +25,17 @@ typedef struct {
>> unsigned long env;
>> } func_descr_t;
>>
>> +#if defined(CONFIG_PPC64) && (!defined(_CALL_ELF) || _CALL_ELF == 1)
>> +/*
>> + * On PPC64 ABIv1 the function pointer actually points to the
>> + * function's descriptor. The first entry in the descriptor is the
>> + * address of the function text.
>> + */
>> +#define constant_function_entry(fn) (((func_descr_t *)(fn))->entry)
>> +#else
>> +#define constant_function_entry(fn) ((unsigned long)(fn))
>> +#endif
>> +
>> #endif /* __ASSEMBLY__ */
>>
>> #endif /* _ASM_POWERPC_TYPES_H */
>> diff --git a/include/linux/kprobes.h b/include/linux/kprobes.h
>> index e059507..637eafe 100644
>> --- a/include/linux/kprobes.h
>> +++ b/include/linux/kprobes.h
>> @@ -40,6 +40,7 @@
>> #include <linux/rcupdate.h>
>> #include <linux/mutex.h>
>> #include <linux/ftrace.h>
>> +#include <linux/types.h>
>>
>> #ifdef CONFIG_KPROBES
>> #include <asm/kprobes.h>
>> @@ -485,7 +486,7 @@ static inline int enable_jprobe(struct jprobe *jp)
>> #define __NOKPROBE_SYMBOL(fname) \
>> static unsigned long __used \
>> __attribute__((section("_kprobe_blacklist"))) \
>> - _kbl_addr_##fname = (unsigned long)fname;
>> + _kbl_addr_##fname = constant_function_entry(fname);
>> #define NOKPROBE_SYMBOL(fname) __NOKPROBE_SYMBOL(fname)
>
>
> Throws up build errors for me :
>
> CC kernel/notifier.o
> kernel/notifier.c:105:1: error: initializer element is not constant
> NOKPROBE_SYMBOL(notifier_call_chain);
> ^
> kernel/notifier.c:188:1: error: initializer element is not constant
> NOKPROBE_SYMBOL(__atomic_notifier_call_chain);
> ^
> kernel/notifier.c:196:1: error: initializer element is not constant
> NOKPROBE_SYMBOL(atomic_notifier_call_chain);
> ^
> kernel/notifier.c:546:1: error: initializer element is not constant
> NOKPROBE_SYMBOL(notify_die);
> ^
> make[1]: *** [kernel/notifier.o] Error 1
> make: *** [kernel] Error 2
Thanks for the test!
>> +#define constant_function_entry(fn) (((func_descr_t *)(fn))->entry)
Ah! right, This is not allowed for initialization...
I'll update it to deref pointer when it is used.
Thank you again!
>
> Thanks
> Suzuki
>
>
--
Masami HIRAMATSU
Software Platform Research Dept. Linux Technology Research Center
Hitachi, Ltd., Yokohama Research Laboratory
E-mail: masami.hiramatsu.pt@...achi.com
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