On Wed, Oct 10, 2018 at 5:22 PM, Thomas Gleixner <tglx@xxxxxxxxxxxxx> wrote: > On Wed, 10 Oct 2018, syzbot wrote: > > Cc+: Miklos It seems reasonable to ignore arch/.*/mm/physaddr.c as suspected guilty file in future -- we already ignore everything related to kmalloc/kfree and this is called from kfree. I've made the corresponding change to syzkaller: https://github.com/google/syzkaller/commit/ba8cd6d708b97d6be4f9164758b6a7c690d252b2 Thanks for re-routing this one, Thomas! >> Hello, >> >> syzbot found the following crash on: >> >> HEAD commit: 0854ba5ff5c9 Merge git://git.kernel.org/pub/scm/linux/kern.. >> git tree: upstream >> console output: https://syzkaller.appspot.com/x/log.txt?x=15e64ea1400000 >> kernel config: https://syzkaller.appspot.com/x/.config?x=88e9a8a39dc0be2d >> dashboard link: https://syzkaller.appspot.com/bug?extid=ff03fe05c717b82502d0 >> compiler: gcc (GCC) 8.0.1 20180413 (experimental) >> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10e516a1400000 >> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11d6e93a400000 >> >> IMPORTANT: if you fix the bug, please add the following tag to the commit: >> Reported-by: syzbot+ff03fe05c717b82502d0@xxxxxxxxxxxxxxxxxxxxxxxxx >> >> RBP: 00007ffc881226c0 R08: 0000000020000100 R09: 0000000000000100 >> R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003 >> R13: ffffffffffffffff R14: 0000000000000000 R15: 0000000000000000 >> overlayfs: failed to verify origin (syzkaller.Ry8w8Y/file0, ino=16483, >> err=-12) >> ------------[ cut here ]------------ >> kernel BUG at arch/x86/mm/physaddr.c:22! >> invalid opcode: 0000 [#1] PREEMPT SMP KASAN >> CPU: 0 PID: 5918 Comm: syz-executor189 Not tainted 4.19.0-rc7+ #53 >> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google >> 01/01/2011 >> RIP: 0010:__phys_addr+0xff/0x120 arch/x86/mm/physaddr.c:22 >> Code: 3c 02 00 75 31 4c 8b 25 ff c3 ee 07 48 89 de bf ff ff ff 1f e8 a2 7a 46 >> 00 49 01 dc 48 81 fb ff ff ff 1f 76 a7 e8 61 79 46 00 <0f> 0b e8 6a e9 89 00 >> e9 7a ff ff ff e8 c0 e9 89 00 eb c8 0f 1f 40 >> RSP: 0018:ffff8801c3387770 EFLAGS: 00010093 >> RAX: ffff8801c323a080 RBX: 000000007ffffff4 RCX: ffffffff81385c1e >> RDX: 0000000000000000 RSI: ffffffff81385c2f RDI: 0000000000000007 >> RBP: ffff8801c3387788 R08: ffff8801c323a080 R09: ffffed003b5c4fe8 >> R10: ffffed003b5c4fe8 R11: ffff8801dae27f47 R12: 000000007ffffff4 >> R13: 0000000000000001 R14: ffffffff882f8c80 R15: 0000000000004063 >> FS: 000000000148d880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 >> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 >> CR2: 0000000000619570 CR3: 00000001c4ab0000 CR4: 00000000001406f0 >> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 >> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 >> Call Trace: >> virt_to_head_page include/linux/mm.h:658 [inline] >> virt_to_cache mm/slab.c:399 [inline] >> kfree+0x7b/0x230 mm/slab.c:3809 >> ovl_verify_set_fh+0xba/0x180 fs/overlayfs/namei.c:435 >> ovl_verify_origin fs/overlayfs/overlayfs.h:316 [inline] >> ovl_get_indexdir fs/overlayfs/super.c:1139 [inline] >> ovl_fill_super+0x3026/0x3f7b fs/overlayfs/super.c:1441 >> mount_nodev+0x6b/0x110 fs/super.c:1204 >> ovl_mount+0x2c/0x40 fs/overlayfs/super.c:1518 >> mount_fs+0xae/0x31d fs/super.c:1261 >> vfs_kern_mount.part.35+0xdc/0x4f0 fs/namespace.c:961 >> vfs_kern_mount fs/namespace.c:951 [inline] >> do_new_mount fs/namespace.c:2457 [inline] >> do_mount+0x581/0x31f0 fs/namespace.c:2787 >> ksys_mount+0x12d/0x140 fs/namespace.c:3003 >> __do_sys_mount fs/namespace.c:3017 [inline] >> __se_sys_mount fs/namespace.c:3014 [inline] >> __x64_sys_mount+0xbe/0x150 fs/namespace.c:3014 >> do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 >> entry_SYSCALL_64_after_hwframe+0x49/0xbe >> RIP: 0033:0x4418e9 >> Code: 26 02 00 85 c0 b8 00 00 00 00 48 0f 44 c3 5b c3 90 48 89 f8 48 89 f7 48 >> 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f >> 83 cb 08 fc ff c3 66 2e 0f 1f 84 00 00 00 00 >> RSP: 002b:00007ffc88122678 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 >> RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004418e9 >> RDX: 00000000200000c0 RSI: 0000000020000000 RDI: 0000000000400000 >> RBP: 00007ffc881226c0 R08: 0000000020000100 R09: 0000000000000100 >> R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003 >> R13: ffffffffffffffff R14: 0000000000000000 R15: 0000000000000000 >> Modules linked in: >> ---[ end trace 25e838f694c8a24f ]--- >> RIP: 0010:__phys_addr+0xff/0x120 arch/x86/mm/physaddr.c:22 >> Code: 3c 02 00 75 31 4c 8b 25 ff c3 ee 07 48 89 de bf ff ff ff 1f e8 a2 7a 46 >> 00 49 01 dc 48 81 fb ff ff ff 1f 76 a7 e8 61 79 46 00 <0f> 0b e8 6a e9 89 00 >> e9 7a ff ff ff e8 c0 e9 89 00 eb c8 0f 1f 40 >> RSP: 0018:ffff8801c3387770 EFLAGS: 00010093 >> RAX: ffff8801c323a080 RBX: 000000007ffffff4 RCX: ffffffff81385c1e >> RDX: 0000000000000000 RSI: ffffffff81385c2f RDI: 0000000000000007 >> RBP: ffff8801c3387788 R08: ffff8801c323a080 R09: ffffed003b5c4fe8 >> R10: ffffed003b5c4fe8 R11: ffff8801dae27f47 R12: 000000007ffffff4 >> R13: 0000000000000001 R14: ffffffff882f8c80 R15: 0000000000004063 >> FS: 000000000148d880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 >> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 >> CR2: 0000000000619570 CR3: 00000001c4ab0000 CR4: 00000000001406f0 >> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 >> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 >> >> >> --- >> This bug is generated by a bot. It may contain errors. >> See https://goo.gl/tpsmEJ for more information about syzbot. >> syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. >> >> syzbot will keep track of this bug report. See: >> https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with syzbot. >> syzbot can test patches for this bug, for details see: >> https://goo.gl/tpsmEJ#testing-patches > > -- > You received this message because you are subscribed to the Google Groups "syzkaller-bugs" group. > To unsubscribe from this group and stop receiving emails from it, send an email to syzkaller-bugs+unsubscribe@xxxxxxxxxxxxxxxx. > To view this discussion on the web visit https://groups.google.com/d/msgid/syzkaller-bugs/alpine.DEB.2.21.1810101721430.15060%40nanos.tec.linutronix.de. > For more options, visit https://groups.google.com/d/optout.
