linux-kernel - [x86] 24256c140e: dmesg.UBSAN:array-index-out-of-bounds_in_arch/x86/mm/dump

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Message-ID: <20200607072749.GW12456@shao2-debian>
Date:   Sun, 7 Jun 2020 15:27:49 +0800
From:   kernel test robot <rong.a.chen@...el.com>
To:     Steven Price <steven.price@....com>
Cc:     Stephen Rothwell <sfr@...b.auug.org.au>,
        Jan Beulich <jbeulich@...e.com>,
        Andy Lutomirski <luto@...nel.org>,
        Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>, lkp@...ts.01.org
Subject: [x86] 24256c140e:
 dmesg.UBSAN:array-index-out-of-bounds_in_arch/x86/mm/dump_pagetables.c

Greeting,

FYI, we noticed the following commit (built with gcc-9):

commit: 24256c140e59c3431af4918fd4ec892102cbc2f3 ("x86: mm: ptdump: calculate effective permissions correctly")
https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master

in testcase: boot

on test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 8G

caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):




If you fix the issue, kindly add following tag
Reported-by: kernel test robot <rong.a.chen@...el.com>


[    8.785395] UBSAN: array-index-out-of-bounds in arch/x86/mm/dump_pagetables.c:285:27
[    8.787718] index -1 is out of range for type 'pgprotval_t [5]'
[    8.789278] CPU: 1 PID: 1 Comm: swapper/0 Not tainted 5.7.0-rc7-00027-g24256c140e59c #1
[    8.791350] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
[    8.793505] Call Trace:
[    8.794221]  dump_stack+0x6c/0x94
[    8.795140]  ubsan_epilogue+0x8/0x3e
[    8.796132]  __ubsan_handle_out_of_bounds+0x48/0x53
[    8.797362]  ? is_visible+0x2b/0x32
[    8.798231]  ? atomic_try_cmpxchg+0x4c/0x57
[    8.799203]  note_page+0x37/0x80b
[    8.800138]  ? __up_read+0x352/0x37b
[    8.801124]  ptdump_walk_pgd+0x57/0x60
[    8.802145]  ptdump_walk_pgd_level_core+0x72/0x9f
[    8.803369]  ? ptdump_walk_pgd_level_debugfs+0x18/0x18
[    8.804613]  ? ptdump_walk_pgd_level_core+0x9f/0x9f
[    8.805779]  ptdump_walk_pgd_level_checkwx+0x1d/0x21
[    8.806873]  mark_rodata_ro+0x9f/0xa6
[    8.807821]  ? rest_init+0x7f/0x164
[    8.808808]  kernel_init+0x44/0xf7
[    8.809735]  ? rest_init+0x164/0x164
[    8.810708]  ret_from_fork+0x19/0x24


To reproduce:

        # build kernel
	cd linux
	cp config-5.7.0-rc7-00027-g24256c140e59c .config
	make HOSTCC=gcc-9 CC=gcc-9 ARCH=i386 olddefconfig prepare modules_prepare bzImage

        git clone https://github.com/intel/lkp-tests.git
        cd lkp-tests
        bin/lkp qemu -k <bzImage> job-script # job-script is attached in this email



Thanks,
Rong Chen


View attachment "config-5.7.0-rc7-00027-g24256c140e59c" of type "text/plain" (114053 bytes)

View attachment "job-script" of type "text/plain" (4808 bytes)

Download attachment "dmesg.xz" of type "application/x-xz" (14164 bytes)