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. -- 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
