From: Daniel Micay <danielmicay@gmail.com>
To: kernel test robot <xiaolong.ye@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
Kees Cook <keescook@chromium.org>, Arnd Bergmann <arnd@arndb.de>,
Mark Rutland <mark.rutland@arm.com>,
Daniel Axtens <dja@axtens.net>,
Rasmus Villemoes <linux@rasmusvillemoes.dk>,
Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
Chris Metcalf <cmetcalf@ezchip.com>,
Thomas Gleixner <tglx@linutronix.de>,
"H. Peter Anvin" <hpa@zytor.com>, Ingo Molnar <mingo@elte.hu>,
Andrew Morton <akpm@linux-foundation.org>,
LKML <linux-kernel@vger.kernel.org>,
lkp@01.org
Subject: Re: [lkp-robot] [include/linux/string.h] 6974f0c455: kernel_BUG_at_lib/string.c
Date: Thu, 20 Jul 2017 00:02:23 -0400 [thread overview]
Message-ID: <1500523343.2055.2.camel@gmail.com> (raw)
In-Reply-To: <20170720014238.GH27396@yexl-desktop>
> [ 8.134886] arch_prepare_optimized_kprobe+0xd5/0x171
> [ 8.134886] arch_prepare_optimized_kprobe+0xd5/0x171
Probably this:
/* Copy arch-dep-instance from template */
memcpy(buf, &optprobe_template_entry, TMPL_END_IDX);
Not a real bug, just technically undefined because these are u32:
typedef u32 kprobe_opcode_t;
extern __visible kprobe_opcode_t optprobe_template_entry;
extern __visible kprobe_opcode_t optprobe_template_val;
extern __visible kprobe_opcode_t optprobe_template_call;
extern __visible kprobe_opcode_t optprobe_template_end;
extern __visible kprobe_opcode_t optprobe_template_sub_sp;
extern __visible kprobe_opcode_t optprobe_template_add_sp;
extern __visible kprobe_opcode_t optprobe_template_restore_begin;
extern __visible kprobe_opcode_t optprobe_template_restore_orig_insn;
extern __visible kprobe_opcode_t optprobe_template_restore_end;
Could be switched to unknown size arrays like optprobe_template_entry[]
but it might be best to just mark the kprobe code with #define
__NO_FORTIFY.
next prev parent reply other threads:[~2017-07-20 4:02 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-07-20 1:42 [lkp-robot] [include/linux/string.h] 6974f0c455: kernel_BUG_at_lib/string.c kernel test robot
2017-07-20 4:02 ` Daniel Micay [this message]
2017-07-20 4:04 ` Linus Torvalds
2017-07-20 4:41 ` Daniel Micay
2017-07-20 13:46 ` Masami Hiramatsu
2017-07-20 15:51 ` Masami Hiramatsu
2017-07-20 18:41 ` Linus Torvalds
2017-07-20 22:20 ` Masami Hiramatsu
2017-07-21 3:29 ` Masami Hiramatsu
2017-07-21 1:59 ` Ye Xiaolong
2017-07-21 5:48 ` Kees Cook
2017-07-21 9:15 ` Andy Shevchenko
2017-07-21 10:03 ` Petr Mladek
2017-07-25 23:35 ` Kees Cook
2017-07-26 0:11 ` Linus Torvalds
2017-07-26 0:38 ` Kees Cook
2017-07-26 2:37 ` Daniel Micay
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