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Date: Wed, 15 Jan 2014 16:19:34 -0800 From: Kees Cook <keescook@...omium.org> To: Fengguang Wu <fengguang.wu@...el.com> Cc: "H. Peter Anvin" <hpa@...ux.intel.com>, LKML <linux-kernel@...r.kernel.org> Subject: Re: [x86, kaslr] PANIC: early exception 0e rip 10:ffffffff8ae04c6e error 0 cr2 ffffffff81972b28 Is it possible this is the bug that was fixed with "x86, relocs: add percpu fixup for GNU ld 2.23"? 82fa9637a2ba285bcc7c5050c73010b2c1b3d803 doesn't include the full x86,kalsr (and x86,relocs) series, so I'm not sure it's a good place to test. -Kees On Wed, Jan 15, 2014 at 4:05 PM, Fengguang Wu <fengguang.wu@...el.com> wrote: > On Wed, Jan 15, 2014 at 02:32:52PM -0800, Kees Cook wrote: >> On Wed, Jan 15, 2014 at 4:24 AM, Fengguang Wu <fengguang.wu@...el.com> wrote: >> > Kees, >> > >> > This script can reproduce the problem. Please modify the -initrd line >> > before use. >> > >> > Usage: >> > ./kvm-0day.sh vmlinuz-3.12.0-rc4-00008-g6e6a493 >> > >> > #!/bin/bash >> > >> > kernel=$1 >> > >> > kvm=( >> > qemu-system-x86_64 -cpu kvm64 -enable-kvm >> > -kernel $kernel >> > -initrd /kernel-tests/initrd/yocto-minimal-x86_64.cgz >> > # -initrd /kernel-tests/initrd/yocto-minimal-i386.cgz >> > # -initrd /kernel-tests/initrd/quantal-core-i386.cgz >> > # -initrd /kernel-tests/initrd/quantal-core-x86_64.cgz >> > -smp 2 >> > -m 256M >> > -net nic,vlan=0,macaddr=00:00:00:00:00:00,model=virtio >> > -net user,vlan=0 >> > -net nic,vlan=1,model=e1000 >> > -net user,vlan=1 >> > -boot order=nc >> > -no-reboot >> > -watchdog i6300esb >> > -serial stdio >> > -display none >> > -monitor null >> > ) >> > >> > append=( >> > debug >> > sched_debug >> > apic=debug >> > ignore_loglevel >> > # dyndbg=\"func kobject_release +p\" >> > sysrq_always_enabled >> > panic=10 >> > prompt_ramdisk=0 >> > earlyprintk=ttyS0,115200 >> > console=ttyS0,115200 >> > console=tty0 >> > vga=normal >> > root=/dev/ram0 >> > rw >> > ) >> > >> > "${kvm[@]}" --append "${append[*]}" >> >> Thanks! I'm using your yocto image and this script, but I still am not >> encountering the problem. I'm building next-20140114 using the >> randconfig you sent in the original report. It looks like you're built >> against a slightly different kernel version? Is there some way you can >> push the tree you're building to git somewhere for me to fetch? > > Kees, judging from the below bisect log, next-20140114 boots fine. > If you still have access to commit 82fa9637a2ba285bcc7c5050c73010b2c1b3d803 > in the tip tree, it's the right one to test. > > git bisect start 6e6a4932b0f569b1a5bb4fcbf5dde1b1a42f01bb v3.11 -- > git bisect good b7c09ad4014e3678e8cc01fdf663c9f43b272dc6 # 22:54 20+ 0 Merge branch 'for-linus' of > git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs > git bisect good 654fdd041227d7de1594baa61c58f2c87bd0640f # 23:15 20+ 1 Merge branch 'x86-urgent-for-linus' of > git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip > git bisect good 0b936842c86392dad2c880539e824881e5d8ba77 # 23:35 20+ 0 Merge > git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc > git bisect good 3dbecf0aa9692cffbb71313a380c0ecc606c5920 # 23:56 20+ 0 Merge tag 'xfs-for-linus-v3.12-rc4' of > git://oss.sgi.com/xfs/xfs > git bisect good 13caa8ed93513dd216ede0c84d833e39fc2e3e2a # 00:06 20+ 0 Merge > git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending > git bisect good 8ab3820fd5b2896d66da7bb2a906bc382e63e7bc # 00:18 20+ 0 x86, kaslr: Return location from decompress_kernel > git bisect bad 82fa9637a2ba285bcc7c5050c73010b2c1b3d803 # 00:18 0- 988 x86, kaslr: Select random position from e820 maps > git bisect good 5bfce5ef55cbe78ee2ee6e97f2e26a8a582008f3 # 00:27 20+ 52 x86, kaslr: Provide randomness functions > # first bad commit: [82fa9637a2ba285bcc7c5050c73010b2c1b3d803] x86, kaslr: Select random position from e820 maps > git bisect good 5bfce5ef55cbe78ee2ee6e97f2e26a8a582008f3 # 00:39 60+ 52 x86, kaslr: Provide randomness functions > git bisect good 1955a14a5ba6e3c3b11117812d11dc550ccc37ae # 00:59 60+ 149 Add linux-next specific files for 20140110 > git bisect good 8bcd53c437d5fdd04fddd8c7e29ecbdc682e7ce1 # 01:22 60+ 60 Revert "x86, kaslr: Select random position from e820 > maps" > git bisect good a6da83f98267bc8ee4e34aa899169991eb0ceb93 # 01:38 60+ 42 Merge branch 'merge' of > git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc > git bisect good cf1c1d193e37b9f79eedddc6bbd71b9f5f9751e5 # 01:45 72+ 1972 Add linux-next specific files for 20140114 > > Thanks, > Fengguang > -- Kees Cook Chrome OS Security -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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