2014-12-02 10:53 GMT+03:00 Dmitry Vyukov <dvyukov@xxxxxxxxxx>: > Hi, > > I am working on Kernel AddressSanitizer, a fast memory error detector > for kernel: > https://code.google.com/p/address-sanitizer/wiki/AddressSanitizerForKernel > > Here is an error report that I got while running trinity: > > ================================================================== > BUG: AddressSanitizer: out of bounds access in > nfnetlink_bind+0xbf/0xe0 at addr ffffffff82eef710 > Read of size 4 by task trinity-main/2533 > Out-of-bounds access to the global variable 'nfnl_group2type' > [ffffffff82eef6e0-ffffffff82eef704) defined at > net/netfilter/nfnetlink.c:43:18 > CPU: 0 PID: 2533 Comm: trinity-main Not tainted 3.18.0-rc1+ #44 > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 > ffffffff835173e8 ffff8800b989fd18 ffffffff82a3d66f 0000000000000007 > ffff8800b989fdc0 ffff8800b989fda8 ffffffff813a3826 0000000000000012 > 0000000000000000 0000000100000018 0000000000000296 ffff8800b989fd88 > Call Trace: > [<ffffffff813a39c1>] __asan_report_load4_noabort+0x41/0x50 > mm/kasan/report.c:236 > [<ffffffff824769cf>] nfnetlink_bind+0xbf/0xe0 net/netfilter/nfnetlink.c:467 > [<ffffffff82469b71>] netlink_bind+0x221/0x7e0 net/netlink/af_netlink.c:1472 > [<ffffffff8238bf77>] SYSC_bind+0x117/0x170 net/socket.c:1541 > [<ffffffff8238dc29>] SyS_bind+0x9/0x10 net/socket.c:1527 > [<ffffffff82a522a9>] system_call_fastpath+0x12/0x17 > arch/x86/kernel/entry_64.S:422 > Memory state around the buggy address: > ffffffff82eef480: 00 00 00 00 00 00 00 00 00 00 00 00 00 f8 f8 f8 > ffffffff82eef500: f8 f8 f8 f8 00 00 00 00 f8 f8 f8 f8 00 00 00 01 > ffffffff82eef580: f8 f8 f8 f8 00 00 00 00 05 f8 f8 f8 f8 f8 f8 f8 > ffffffff82eef600: 00 00 04 f8 f8 f8 f8 f8 00 00 f8 f8 f8 f8 f8 f8 > ffffffff82eef680: 00 00 00 00 07 f8 f8 f8 f8 f8 f8 f8 00 00 00 00 >>ffffffff82eef700: 04 f8 f8 f8 f8 f8 f8 f8 00 06 f8 f8 f8 f8 f8 f8 > ^ > ffffffff82eef780: 00 00 00 05 f8 f8 f8 f8 00 00 00 00 00 f8 f8 f8 > ffffffff82eef800: f8 f8 f8 f8 00 00 00 00 02 f8 f8 f8 f8 f8 f8 f8 > ffffffff82eef880: 00 00 00 00 06 f8 f8 f8 f8 f8 f8 f8 00 00 00 04 > ffffffff82eef900: f8 f8 f8 f8 00 00 00 00 00 04 f8 f8 f8 f8 f8 f8 > ffffffff82eef980: 00 00 00 07 f8 f8 f8 f8 00 00 00 06 f8 f8 f8 f8 > ================================================================== > > My source is on revision f114040e3ea6e07372334ade75d1ee0 > > As far as I see netlink_bind just calls nfnetlink_bind with whatever > groups user has requested; nfnetlink_bind in turn do not do any checks > before indexing the global nfnl_group2type array with the group. I've reported this few weeks ago: https://lkml.org/lkml/2014/11/13/65 -- To unsubscribe from this list: send the line "unsubscribe netfilter-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
