linux-kernel - Re: [patch 1/2] x86,module: Detect VMX modules and disable Split-Lock-Detect

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Date:   Fri, 3 Apr 2020 22:43:08 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     kbuild-all@...ts.01.org, LKML <linux-kernel@...r.kernel.org>,
        "x86@...nel.org, Kenneth R. Crudup " <kenny@...ix.com>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Jessica Yu <jeyu@...nel.org>,
        Fenghua Yu <fenghua.yu@...el.com>,
        Xiaoyao Li <xiaoyao.li@...el.com>,
        Nadav Amit <namit@...are.com>,
        Thomas Hellstrom <thellstrom@...are.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Tony Luck <tony.luck@...el.com>,
        Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [patch 1/2] x86,module: Detect VMX modules and disable
 Split-Lock-Detect

Hi Thomas,

I love your patch! Yet something to improve:

[auto build test ERROR on tip/auto-latest]
[also build test ERROR on next-20200403]
[cannot apply to jeyu/modules-next tip/x86/core v5.6]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system. BTW, we also suggest to use '--base' option to specify the
base tree in git format-patch, please see https://stackoverflow.com/a/37406982]

url:    https://github.com/0day-ci/linux/commits/Thomas-Gleixner/x86-Prevent-Split-Lock-Detection-wreckage-on-VMX-hypervisors/20200403-171430
base:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git ee8bac724cc7767dcf9480afb656318994f22c3d
config: x86_64-randconfig-s1-20200403 (attached as .config)
compiler: gcc-7 (Ubuntu 7.5.0-6ubuntu2) 7.5.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@...el.com>

All errors (new ones prefixed by >>):

   arch/x86/kernel/module.c: In function 'module_finalize':
>> arch/x86/kernel/module.c:257:17: error: 'struct module' has no member named 'sld_safe'
     if (text && !me->sld_safe) {
                    ^~

vim +257 arch/x86/kernel/module.c

   220	
   221	int module_finalize(const Elf_Ehdr *hdr,
   222			    const Elf_Shdr *sechdrs,
   223			    struct module *me)
   224	{
   225		const Elf_Shdr *s, *text = NULL, *alt = NULL, *locks = NULL,
   226			*para = NULL, *orc = NULL, *orc_ip = NULL;
   227		char *secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
   228	
   229		for (s = sechdrs; s < sechdrs + hdr->e_shnum; s++) {
   230			if (!strcmp(".text", secstrings + s->sh_name))
   231				text = s;
   232			if (!strcmp(".altinstructions", secstrings + s->sh_name))
   233				alt = s;
   234			if (!strcmp(".smp_locks", secstrings + s->sh_name))
   235				locks = s;
   236			if (!strcmp(".parainstructions", secstrings + s->sh_name))
   237				para = s;
   238			if (!strcmp(".orc_unwind", secstrings + s->sh_name))
   239				orc = s;
   240			if (!strcmp(".orc_unwind_ip", secstrings + s->sh_name))
   241				orc_ip = s;
   242		}
   243	
   244		if (alt) {
   245			/* patch .altinstructions */
   246			void *aseg = (void *)alt->sh_addr;
   247			apply_alternatives(aseg, aseg + alt->sh_size);
   248		}
   249		if (locks && text) {
   250			void *lseg = (void *)locks->sh_addr;
   251			void *tseg = (void *)text->sh_addr;
   252			alternatives_smp_module_add(me, me->name,
   253						    lseg, lseg + locks->sh_size,
   254						    tseg, tseg + text->sh_size);
   255		}
   256	
 > 257		if (text && !me->sld_safe) {
   258			void *tseg = (void *)text->sh_addr;
   259			split_lock_validate_module_text(me, tseg, tseg + text->sh_size);
   260		}
   261	
   262		if (para) {
   263			void *pseg = (void *)para->sh_addr;
   264			apply_paravirt(pseg, pseg + para->sh_size);
   265		}
   266	
   267		/* make jump label nops */
   268		jump_label_apply_nops(me);
   269	
   270		if (orc && orc_ip)
   271			unwind_module_init(me, (void *)orc_ip->sh_addr, orc_ip->sh_size,
   272					   (void *)orc->sh_addr, orc->sh_size);
   273	
   274		return 0;
   275	}
   276	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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