Hi Eric,
While fuzzing with trinity on a -next kernel with the undefined behaviour
sanitizer path, I've observed the following warning in code which was
introduced in 04ca6973f7 ("ip: make IP identifiers less predictable"):
[ 234.317163]
================================================================================
[ 234.320001] UBSan: Undefined behaviour in
./arch/x86/include/asm/atomic.h:157:9
[ 234.321568] signed integer overflow:
[ 234.322772] 1678406574 + 641542997 cannot be represented in type 'int'
[ 234.324316] CPU: 2 PID: 16819 Comm: trinity-c537 Not tainted
3.18.0-next-20141216-sasha-00065-g3c56201-dirty #1609
[ 234.326548] 0000000000000000 0000000000000000 ffffffffbc2e4e10
ffff8802e63137e8
[ 234.327837] ffffffffb126bd68 1ffffffff7aa2c03 ffffffffbc2e5c34
ffff8802e6313808
[ 234.329117] ffffffffb126df6f 1ffffffff7aa2c03 ffffffffbc2e5c34
ffff8802e63138c8
[ 234.330755] Call Trace:
[ 234.331213] dump_stack (lib/dump_stack.c:52)
[ 234.332025] ubsan_epilogue (lib/ubsan.c:159)
[ 234.332986] handle_overflow (lib/ubsan.c:191)
[ 234.334022] ? preempt_schedule (./arch/x86/include/asm/preempt.h:77
(discriminator 1) kernel/sched/core.c:2898 (discriminator 1))
[ 234.334945] ? ___preempt_schedule (arch/x86/lib/thunk_64.S:42)
[ 234.335919] __ubsan_handle_add_overflow (lib/ubsan.c:200)
[ 234.337211] ip_idents_reserve (./arch/x86/include/asm/atomic.h:157
net/ipv4/route.c:482)
[ 234.338935] __ip_select_ident (include/uapi/linux/swab.h:49 (discriminator
3) net/ipv4/route.c:498 (discriminator 3))
[ 234.340773] __ip_make_skb (include/net/ip.h:339 include/net/ip.h:345
net/ipv4/ip_output.c:1386)
[ 234.342736] ip_push_pending_frames (include/net/ip.h:148
net/ipv4/ip_output.c:1430)
[ 234.344707] raw_sendmsg (net/ipv4/raw.c:644)
[ 234.346537] ? system_call_fastpath (arch/x86/kernel/entry_64.S:423)
[ 234.348431] ? get_parent_ip (kernel/sched/core.c:2564)
[ 234.350259] ? preempt_count_sub (kernel/sched/core.c:2620)
[ 234.352170] inet_sendmsg (net/ipv4/af_inet.c:734)
[ 234.354107] do_sock_sendmsg (net/socket.c:646 (discriminator 4))
[ 234.355947] ? retint_restore_args (arch/x86/kernel/entry_64.S:844)
[ 234.357962] ___sys_sendmsg (net/socket.c:653 net/socket.c:2094)
[ 234.359545] ? sched_clock (./arch/x86/include/asm/paravirt.h:192
arch/x86/kernel/tsc.c:304)
[ 234.361182] ? __acct_update_integrals (kernel/tsacct.c:147)
[ 234.363394] ? acct_account_cputime (kernel/tsacct.c:168)
[ 234.365417] __sys_sendmsg (net/socket.c:2131)
[ 234.367248] SyS_sendmsg (net/socket.c:2136)
[ 234.368925] system_call_fastpath (arch/x86/kernel/entry_64.S:423)
[ 234.371038]
================================================================================
Thanks,
Sasha
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